CN112186795A - Fault ride-through method and system for new energy hybrid Direct Current (DC) sending system - Google Patents
Fault ride-through method and system for new energy hybrid Direct Current (DC) sending systemDownload PDFInfo
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- CN112186795A CN112186795ACN201910603117.1ACN201910603117ACN112186795ACN 112186795 ACN112186795 ACN 112186795ACN 201910603117 ACN201910603117 ACN 201910603117ACN 112186795 ACN112186795 ACN 112186795A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
Translated fromChinese
Description
Technical Field
The invention relates to the technical field of simulation in a hybrid direct current interconnection technology, in particular to a fault ride-through method and a fault ride-through system of a new energy hybrid direct current sending-out system.
Background
The method comprises the steps that the Voltage of a photovoltaic side, the wind power side and other new energy sources is boosted and collected through a Voltage Source Converter (VSC) technology, the new energy sources are sent out through a hybrid direct current interconnection interface and a Voltage Source type Converter station power electronic interface by using a high-Voltage direct current transmission line after the new energy sources are collected, and the new energy sources are inverted and sent into an alternating current power grid by using an LCC Converter station at a receiving end, so that the method becomes an important trend of new energy application in China. In order to realize the starting and sending of new energy, the hybrid direct current interconnection interface needs to realize positive and negative power transmission. The inversion of the mixed direct current can be realized by adopting an isolated topology structure formed by connecting two sets of modular multilevel converters through an alternating current side, and the inversion of the mixed direct current is one of the choices of the mixed direct current interconnection interfaces. New energy power generation is the electric current source, and its alternating voltage supports and is provided by sending end VSC. When the receiving end has an alternating current fault, the voltage of the direct current line falls to different degrees, but the direct current line can still work under the condition of low current, the power transmitted by the direct current network also seriously slides down, and if the new energy side does not carry out power output limitation, the accumulated electric energy can be gathered in the capacitor in the link, so that the device is damaged. In order to ensure the stability of system power output, it is therefore necessary to study the fault response characteristics of the new energy output system when the receiving-end ac system fails, and analyze the fault ride-through method of the hybrid dc interconnect interface, thereby ensuring the continuous and stable operation of the new energy output system under the receiving-end failure.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a fault ride-through method and a fault ride-through system for a new energy hybrid direct current sending system, wherein when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails, the system can normally work for a short time; when the direct-current voltage is recovered to a certain degree, the system can transmit electric energy to the receiving end to assist the receiving end alternating-current power grid to recover normal work.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a fault ride-through method of a new energy hybrid direct current sending system, and the improvement is that the method comprises the following steps:
when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails, recording the duration time of the failure and acquiring the actual voltage of a direct current line in the new energy hybrid direct current sending system;
according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, an unloading circuit and a breaker which are arranged in the new energy hybrid direct current sending system are adjusted, so that the new energy hybrid direct current sending system can realize fault ride-through;
the circuit breaker is arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the receiving end LCC converter station, and the unloading circuit is respectively arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and a voltage source converter in the new energy hybrid direct-current sending-out system.
Preferably, the adjusting an unloading circuit and a breaker arranged in the new energy hybrid dc-dc sending system according to the fault duration of the new energy hybrid dc-dc sending system and the actual voltage of the dc line to enable the new energy hybrid dc-dc sending system to implement fault ride-through includes:
step 1: t is set in sequence from the moment when the receiving end alternating current power grid of the new energy hybrid direct current sending system fails1、t2And t3Three presetsSetting a threshold voltage of a direct current line at a time point;
step 2: judging whether the actual voltage of the direct current line is smaller than a threshold voltage or not;
if the actual voltage of the direct current line is smaller than the threshold voltage, executing the step 3;
if the actual voltage of the direct current line is larger than the threshold voltage, executing the step 4;
and step 3: unloading circuits are arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter;
if the fault is at t1Eliminating before the moment, and stopping the work of unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter; no side, when the fault duration reaches t1At that moment, the circuit breaker is opened;
if the fault is at t2Before the moment, the breaker is closed, and unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and a voltage source converter quit working, wherein the hybrid direct-current interconnection interface is switched to a constant power or constant current control mode; no side, when the fault duration reaches t2At the moment, the new energy mixed direct current sending system stops working;
and 4, step 4: an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker is put into use;
if the fault is at t3Eliminating before the moment, and stopping working of an unloading circuit between a hybrid direct current interconnection interface and a receiving end alternating current power grid in the new energy hybrid direct current sending-out system;
no side, when the fault duration reaches t3At any moment, the new energy mixed direct current sending system sends out the maximum work according to the maximum workAnd adjusting the output power of the new energy, or stopping the new energy according to a scheduling instruction, and restarting power generation after the fault of the receiving end is eliminated.
Preferably, the threshold voltage is half of the rated voltage of the direct current line.
Preferably, the initial state of the circuit breaker is closed.
Preferably, the hybrid dc interconnection interface is formed by a first modular multilevel converter and a second modular multilevel converter which are connected to each other through an ac side.
In a fault ride-through system for a new energy hybrid dc delivery system, the improvement comprising:
the recording module is used for recording the fault duration time and acquiring the actual voltage of a direct current line in the new energy hybrid direct current sending system when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails;
the adjusting module is used for adjusting an unloading circuit and a breaker arranged in the new energy hybrid direct current sending system according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, so that the new energy hybrid direct current sending system can realize fault ride-through;
the circuit breaker is arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the receiving end LCC converter station, and the unloading circuit is respectively arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and a voltage source converter in the new energy hybrid direct-current sending-out system.
Preferably, the adjusting module is configured to:
step 1: t is set in sequence from the moment when the receiving end alternating current power grid of the new energy hybrid direct current sending system fails1、t2And t3Setting threshold voltage of a direct current line at three preset time points;
step 2: judging whether the actual voltage of the direct current line is smaller than a threshold voltage or not;
if the actual voltage of the direct current line is smaller than the threshold voltage, executing the step 3;
if the actual voltage of the direct current line is larger than the threshold voltage, executing the step 4;
and step 3: unloading circuits are arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter;
if the fault is at t1Eliminating before the moment, and stopping the work of unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter; no side, when the fault duration reaches t1At that moment, the circuit breaker is opened;
if the fault is at t2Before the moment, the breaker is closed, and unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and a voltage source converter quit working, wherein the hybrid direct-current interconnection interface is switched to a constant power or constant current control mode; no side, when the fault duration reaches t2At the moment, the new energy mixed direct current sending system stops working;
and 4, step 4: an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker is put into use;
if the fault is at t3Eliminating before the moment, and stopping working of an unloading circuit between a hybrid direct current interconnection interface and a receiving end alternating current power grid in the new energy hybrid direct current sending-out system;
no side, when the fault duration reaches t3And at the moment, the new energy mixed direct current sending system adjusts the sending power of the new energy according to the maximum power which can be sent out, or stops the new energy according to a scheduling instruction, and restarts power generation after the fault of the receiving end is eliminated.
Further, the threshold voltage is half of the rated voltage of the direct current line.
Preferably, the initial state of the circuit breaker is closed.
Preferably, the hybrid dc interconnection interface is formed by a first modular multilevel converter and a second modular multilevel converter which are connected to each other through an ac side.
Compared with the closest prior art, the invention has the following beneficial effects:
according to the technical scheme provided by the invention, when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails, the fault duration time is recorded and the actual voltage of a direct current line in the new energy hybrid direct current sending system is obtained; the unloading circuit and the circuit breaker which are arranged in the new energy hybrid direct current sending system are adjusted according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, so that the new energy hybrid direct current sending system still stably works after a fault occurs, excessive limitation on power generation of new energy is not needed, power waste is reduced, and the efficiency of system transmission power is improved.
Drawings
Fig. 1 is a flowchart of a fault ride-through method of a new energy hybrid dc-sending system according to the present invention;
fig. 2 is a structural diagram of a new energy hybrid dc transmission system according to an embodiment of the present invention;
fig. 3 is a flowchart of a fault ride-through method for a new energy hybrid dc delivery system according to an embodiment of the present invention;
fig. 4 is a structural diagram of a hybrid dc interconnection interface in the new energy hybrid dc output system according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fault ride-through system of the new energy hybrid dc output system according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
After a receiving end alternating current power grid of the new energy hybrid direct current sending system fails, the voltage of one side, close to the LCC converter station, of the hybrid direct current interconnection interface is reduced, the voltage of one side, close to the VSC, of the hybrid direct current interconnection interface is affected to generate fluctuation of one end, the power transmission capacity of the LCC converter station is reduced, the power generated and output by the new energy hybrid direct current sending system is unbalanced, and therefore energy accumulation damages instruments.
The invention provides a fault ride-through method of a new energy hybrid Direct Current (DC) sending system, which comprises the following steps as shown in figure 1:
step 101: when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails, recording the duration time of the failure and acquiring the actual voltage of a direct current line in the new energy hybrid direct current sending system;
step 102: according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, an unloading circuit and a breaker which are arranged in the new energy hybrid direct current sending system are adjusted, so that the new energy hybrid direct current sending system can realize fault ride-through;
as shown in fig. 2, the circuit breaker is disposed between a hybrid dc interconnection interface of the new energy hybrid dc output system and the receiving-end LCC converter station, and the unloading circuit is disposed between the hybrid dc interconnection interface of the new energy hybrid dc output system and the circuit breaker, and between the hybrid dc interconnection interface of the new energy hybrid dc output system and the voltage source converter in the energy hybrid dc output system, respectively.
Specifically, thestep 102, as shown in fig. 3, includes:
step 1: receiving end of system is seen off from mixed direct current of new forms of energyT is set in sequence from the moment when the AC power grid fails1、t2And t3Three preset time points and setting the threshold voltage u of the direct current line1；
Step 2: judging whether the actual voltage of the direct current line is smaller than a threshold voltage or not;
if the actual voltage of the direct current line is less than the threshold voltage u1Executing the step 3;
if the actual voltage of the direct current line is greater than the threshold voltage u1Executing the step 4;
and step 3: unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and a voltage source converter are all put into use, the hybrid direct-current interconnection interface is switched into a voltage control mode, and the unloading circuits on the two sides consume power generated by the new energy simultaneously;
if the fault is at t1Eliminating before the moment, recovering the voltage control capability by the converter, recovering the power transmission mode by the hybrid direct-current interconnection interface, and stopping the work of an unloading circuit arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter, recovering the normal transmission of new energy by a direct-current line, and finishing the fault ride-through process; no side, when the fault duration reaches t1At that moment, the circuit breaker is opened;
if the fault is at t2Before the moment, the circuit breaker is closed, an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and a voltage source converter quits working, the hybrid direct-current interconnection interface turns to a constant power or constant current control mode, the whole system recovers normal working, and the fault ride-through process is finished; no side, when the fault duration reaches t2At the moment, the new energy mixed direct current sending system stops working;
and 4, step 4: an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the circuit breaker is put into use, the power which can be output and the current which can be born are calculated according to the proportion of direct-current voltage drop, dynamic switching is carried out, and redundant power is consumed;
if the fault is at t3Eliminating before the moment, stopping the work of an unloading circuit between a hybrid direct current interconnection interface and a receiving end alternating current power grid in the new energy hybrid direct current sending system, recovering the normal transmission of new energy by a line, and finishing the fault ride-through process;
no side, when the fault duration reaches t3And at the moment, the new energy mixed direct current sending system adjusts the sending power of the new energy according to the maximum power which can be sent out, or stops the new energy according to a scheduling instruction, and restarts power generation after the fault of the receiving end is eliminated.
The threshold voltage is half of the rated voltage of the direct current line.
The circuit breaker is initially closed.
As shown in fig. 4, the hybrid dc interconnection interface is formed by a first modular multilevel converter and a second modular multilevel converter which are connected to each other through an ac side.
The invention also provides a fault ride-through system of a new energy hybrid direct current sending system, as shown in fig. 5, the system includes:
the recording module is used for recording the fault duration time and acquiring the actual voltage of a direct current line in the new energy hybrid direct current sending system when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails;
the adjusting module is used for adjusting an unloading circuit and a breaker arranged in the new energy hybrid direct current sending system according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, so that the new energy hybrid direct current sending system can realize fault ride-through;
the circuit breaker is arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the receiving end LCC converter station, and the unloading circuit is respectively arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and a voltage source converter in the new energy hybrid direct-current sending-out system.
The adjusting module is used for:
step 1: t is set in sequence from the moment when the receiving end alternating current power grid of the new energy hybrid direct current sending system fails1、t2And t3Three preset time points and setting the threshold voltage u of the direct current line1；
Step 2: judging whether the actual voltage of the direct current line is smaller than a threshold voltage or not;
if the actual voltage of the direct current line is less than the threshold voltage u1Executing the step 3;
if the actual voltage of the direct current line is greater than the threshold voltage u1Executing the step 4;
and step 3: unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and a voltage source converter are all put into use, the hybrid direct-current interconnection interface is switched into a voltage control mode, and the unloading circuits on the two sides consume power generated by the new energy simultaneously;
if the fault is at t1Eliminating before the moment, recovering the voltage control capability by the converter, recovering the power transmission mode by the hybrid direct-current interconnection interface, and stopping the work of an unloading circuit arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter, recovering the normal transmission of new energy by a direct-current line, and finishing the fault ride-through process; no side, when the fault duration reaches t1At that moment, the circuit breaker is opened;
if the fault is at t2Eliminating before the moment, closing the circuit breaker, setting the hybrid direct current interconnection interface of the new energy hybrid direct current sending system and the hybrid direct current interconnection interface and the voltage between the circuit breakers and in the new energy hybrid direct current sending systemThe unloading circuit between the source converters quits working, the hybrid direct-current interconnection interface turns to a constant power or constant current control mode, the whole system recovers normal working, and the fault ride-through process is finished; no side, when the fault duration reaches t2At the moment, the new energy mixed direct current sending system stops working;
and 4, step 4: an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the circuit breaker is put into use, the power which can be output and the current which can be born are calculated according to the proportion of direct-current voltage drop, dynamic switching is carried out, and redundant power is consumed;
if the fault is at t3Eliminating before the moment, stopping the work of an unloading circuit between a hybrid direct current interconnection interface and a receiving end alternating current power grid in the new energy hybrid direct current sending system, recovering the normal transmission of new energy by a line, and finishing the fault ride-through process;
no side, when the fault duration reaches t3And at the moment, the new energy mixed direct current sending system adjusts the sending power of the new energy according to the maximum power which can be sent out, or stops the new energy according to a scheduling instruction, and restarts power generation after the fault of the receiving end is eliminated.
The threshold voltage is half of the rated voltage of the direct current line.
The circuit breaker is initially closed.
The hybrid direct-current interconnection interface is formed by a first modular multilevel converter and a second modular multilevel converter which are connected with each other through an alternating-current side.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A fault ride-through method of a new energy hybrid Direct Current (DC) sending system is characterized by comprising the following steps:
when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails, recording the duration time of the failure and acquiring the actual voltage of a direct current line in the new energy hybrid direct current sending system;
according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, an unloading circuit and a breaker which are arranged in the new energy hybrid direct current sending system are adjusted, so that the new energy hybrid direct current sending system can realize fault ride-through;
the circuit breaker is arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the receiving end LCC converter station, and the unloading circuit is respectively arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter.
2. The method according to claim 1, wherein the adjusting an unloading circuit and a breaker provided in the new energy hybrid direct current delivery system according to the fault duration of the new energy hybrid direct current delivery system and the actual voltage of the direct current line to enable the new energy hybrid direct current delivery system to realize fault ride-through comprises:
step 1: t is set in sequence from the moment when the receiving end alternating current power grid of the new energy hybrid direct current sending system fails1、t2And t3Setting threshold voltage of a direct current line at three preset time points;
step 2: judging whether the actual voltage of the direct current line is smaller than a threshold voltage or not;
if the actual voltage of the direct current line is smaller than the threshold voltage, executing the step 3;
if the actual voltage of the direct current line is larger than the threshold voltage, executing the step 4;
and step 3: unloading circuits are arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter;
if the fault is at t1Eliminating before the moment, and stopping the work of unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter; no side, when the fault duration reaches t1At that moment, the circuit breaker is opened;
if the fault is at t2Before the moment, the breaker is closed, and unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and a voltage source converter quit working, wherein the hybrid direct-current interconnection interface is switched to a constant power or constant current control mode; no side, when the fault duration reaches t2At the moment, the new energy mixed direct current sending system stops working;
and 4, step 4: an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker is put into use;
if the fault is at t3Eliminating before the moment, and stopping working of an unloading circuit between a hybrid direct current interconnection interface and a receiving end alternating current power grid in the new energy hybrid direct current sending-out system;
no side, when the fault duration reaches t3And at the moment, the new energy mixed direct current sending system adjusts the sending power of the new energy according to the maximum power which can be sent out, or stops the new energy according to a scheduling instruction, and restarts power generation after the fault of the receiving end is eliminated.
3. The method of claim 2, wherein the threshold voltage is half of a rated voltage of the dc line.
4. The method of claim 1, wherein the initial state of the circuit breaker is closed.
5. The method of claim 1, wherein the hybrid dc interconnect interface is comprised of a first modular multilevel converter and a second modular multilevel converter interconnected by an ac side.
6. A fault ride-through system for a new energy hybrid dc delivery system, the system comprising:
the recording module is used for recording the fault duration time and acquiring the actual voltage of a direct current line in the new energy hybrid direct current sending system when a receiving end alternating current power grid of the new energy hybrid direct current sending system fails;
the adjusting module is used for adjusting an unloading circuit and a breaker arranged in the new energy hybrid direct current sending system according to the fault duration of the new energy hybrid direct current sending system and the actual voltage of the direct current line, so that the new energy hybrid direct current sending system can realize fault ride-through;
the circuit breaker is arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the receiving end LCC converter station, and the unloading circuit is respectively arranged between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and a voltage source converter in the new energy hybrid direct-current sending-out system.
7. The system of claim 6, wherein the adjustment module is to:
step 1: t is set in sequence from the moment when the receiving end alternating current power grid of the new energy hybrid direct current sending system fails1、t2And t3Setting threshold voltage of a direct current line at three preset time points;
step 2: judging whether the actual voltage of the direct current line is smaller than a threshold voltage or not;
if the actual voltage of the direct current line is smaller than the threshold voltage, executing the step 3;
if the actual voltage of the direct current line is larger than the threshold voltage, executing the step 4;
and step 3: unloading circuits are arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter;
if the fault is at t1Eliminating before the moment, and stopping the work of unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the voltage source converter; no side, when the fault duration reaches t1At that moment, the circuit breaker is opened;
if the fault is at t2Before the moment, the breaker is closed, and unloading circuits arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and the breaker and between the hybrid direct-current interconnection interface of the new energy hybrid direct-current sending system and a voltage source converter quit working, wherein the hybrid direct-current interconnection interface is switched to a constant power or constant current control mode; no side, when the fault duration reaches t2At the moment, the new energy mixed direct current sending system stops working;
and 4, step 4: an unloading circuit arranged between a hybrid direct-current interconnection interface of the new energy hybrid direct-current sending-out system and the circuit breaker is put into use;
if the fault is at t3Eliminating before the moment, and stopping working of an unloading circuit between a hybrid direct current interconnection interface and a receiving end alternating current power grid in the new energy hybrid direct current sending-out system;
no side, when the fault duration reaches t3And at the moment, the new energy mixed direct current sending system adjusts the sending power of the new energy according to the maximum power which can be sent out, or stops the new energy according to a scheduling instruction, and restarts power generation after the fault of the receiving end is eliminated.
8. The system of claim 7, wherein the threshold voltage is half of a rated voltage of the dc line.
9. The system of claim 6, wherein the initial state of the circuit breaker is closed.
10. The system of claim 6, wherein the hybrid DC interconnect interface is comprised of a first modular multilevel converter and a second modular multilevel converter interconnected by an AC side.
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