Summary of the invention
The object of the invention is to propose a kind of energy management controller of the wind-light storage micro-grid system that is applicable to integrated mill, can make EMS, Terminal Server Client and grid dispatching center obtain in time wind-light storage equipment real-time working data and the system power parameter in this micro-grid system, the grid-connected power output of being convenient to realize whole micro-grid system is by plant area's load consumption, and the layering of accepting EMS and electrical network is allocated, reduce plant area's electric cost, the long-term stability that simultaneously meets wind-light storage micro-grid system is incorporated into the power networks.
For this reason, the present invention is by the following technical solutions:
A kind of energy management controller for wind-light storage micro-grid system, it is characterized in that: comprise energy management supervisory control system, generating and energy-storage system, plant area's load, distribution and protection system, data acquisition system, remote scheduling and supervisory control system, wherein, energy management supervisory control system is by the network switch and generating and energy-storage system, distribution and protection system, data acquisition system is set up communication and is connected, energy management supervisory control system by remote scheduling and supervisory control system to generating and energy-storage system, plant area's load, distribution and protection system, data acquisition system is carried out remote scheduling and monitoring,
Described energy management supervisory control system according to the main switch of current wind-light storage micro-grid system as the cutting and the difference of state and power control enabler flags position of high voltage bus switch, wind power generation set grid-connection switch, the grid-connected switch of photovoltaic generation unit and the grid-connected switch of energy storage device, carry out corresponding master control flow process or troubleshooting process, determine the interior each power supply of wind-light storage micro-grid system and load under different operating modes, all can reach the effective control to microgrid internal power, guarantee that power flow direction meets the demands;
Normally work in order not affect on-site important load, according to plant area's operating mode difference, reality is the load power Pload of plant area, in the time that energy management supervisory control system detects that electrical network input active-power P 1 is less than setting threshold, reduce immediately exerting oneself of wind turbine generator and photovoltaic generation unit, wherein: in the time that exerting oneself of wind turbine generator and photovoltaic generation unit is reduced to 0, electrical network input active-power P 1 excises wind-light storage micro-grid system while being still less than setting threshold.
Except wind turbine generator, photovoltaic generation unit, energy storage device, described energy management controller detects the electric energy, voltage, electric current, frequency of plant area electrical network inlet wire point, wind-light storage micro-grid system access point, wind-light storage micro-grid system low-voltage bus bar, meritorious, idle, power factor etc. by electric power relay equipment, also to detect the energy output of wind turbine generator, photovoltaic generation unit, energy storage device, and the signal detecting is inputted to energy management supervisory control system by Ethernet mode, by grid-connected control logic to the each unit of wind-light storage open, stop, power control; In addition, in plant area, electrical network inlet wire point is provided with reverse power protection device, prevents from being greater than plant area's electric energy adverse current phenomenon causing of loading because of wind-light storage experimental system energy output.
Described generating and energy-storage system include the energy storage device of at least one wind turbine generator, at least one photovoltaic generation unit, at least one lithium battery; Wind turbine generator, photovoltaic generation unit, energy storage device are all connected to ac bus by converter system, then are connected with large electrical network, connect plant area's load on large electrical network;
Described plant area load comprises that factory building is produced load and load in living area;
Described distribution and protection system are for the protection of power flow direction and the grid-connected switch of wind-light storage micro-grid system, the active power that generating and energy-storage system are sent only flows into the load on ac bus, and in protection in the time there is inverse probability situation, tripping wind-light storage micro-grid system electrical network connecting valve, to prevent that wind-light storage micro-grid system from falling power transmission to electrical network;
Described data acquisition system is for analog signal and digital signal, wherein analog signal comprises generating and the signal of telecommunication of the each generating equipment of energy-storage system, the signal of telecommunication of plant area's load each point, and digital signal comes from the on off operating mode of each circuit breaker or the operate condition of protective device in wind-light storage micro-grid system;
Described remote scheduling and supervisory control system are to utilize remote pages to set up remote scheduling and monitor workstation realization.
According to the described energy management controller for wind-light storage micro-grid system, it is characterized in that control principle is as follows:
1) generated output of wind-light storage system is less than plant area's load power, taking electrical network input active-power P 1 as reference signal, dynamically adjust the generated output P3 of wind-light storage system according to load power Pload, meet the requirement that electrical network input active-power P 1 is greater than setting threshold;
2) photovoltaic generation moves according to MPPT;
3) higher limit of wind power generation maximum power is that Pwind-max is discharged and recharged the calculating acquisitions such as power by generated output P3, photovoltaic generation power, the energy storage of wind-light storage system, in the time of wind-powered electricity generation unit generated output Pwind < Pwind-max, wind-powered electricity generation unit moves according to MPPT, in the time of wind-powered electricity generation unit generated output Pwind >=Pwind-max, wind-powered electricity generation unit is according to Pwind-max output-constant operation;
4) according to stabilizing, algorithm is stabilized honourable output pulsation to energy storage device and peak load shifting algorithm reclaims and offered load needs.
According to the described energy management controller for wind-light storage micro-grid system, it is characterized in that the grid-connected control flow of this system control wind-light storage micro-grid system is as follows:
A) emergency shutdown, off-grid are shut down, and control room is powered by UPS; After safe shutdown, closed wind-light storage micro-grid system access switch, 10Kv/690V low-pressure side bus switch successively, system re-powers, and central controller initialization, judges whether manual operation;
B) judge whether No starting wind-light storage system of plant area;
C) under the pattern of being incorporated into the power networks, detection of grid point active power of output P1; Determine whether the operating time, in the time of the operating time, judge whether the meritorious P1 of electrical network input is greater than setting threshold, satisfies condition, according to setting selection, according to stabilizing, algorithm is stabilized honourable output pulsation to energy storage device or peak load shifting algorithm reclaims and offered load needs;
D), when in the operating time, judge whether the meritorious P1 of electrical network input is greater than setting threshold;
E) P1 is greater than setting threshold, and the charged initialization of the each cell controller of wind-light storage is limited to Pwind-max in setting wind-powered electricity generation unit peak power output and is discharged and recharged the calculating acquisitions such as power by generated output P3, photovoltaic generation power, the energy storage of wind-light storage system;
F) aweather group of motors controller transmission Pwind-max instruction of supervisory control system, judges whether wind-powered electricity generation unit receives Pwind-max;
G) wind-powered electricity generation unit receives Pwind-max, enters control system of wind turbines, waits for wind-powered electricity generation set grid-connection condition, satisfy condition, and closed wind-powered electricity generation unit switch; Meanwhile, photovoltaic operates in routine work state, waits for grid-connected condition, satisfies condition, closed photovoltaic switch;
H) in the time of wind power generation, photovoltaic power generation grid-connecting operation, energy storage device is set and operates in grid-connected mode of operation, wait for the grid-connected condition of energy storage, closed energy storage device switch;
I) wind-light storage is incorporated into the power networks, the generated output P3 of detection of grid point active power of output P1, wind-light storage system;
J) determine whether the operating time, not in the time of the operating time, wind-powered electricity generation unit, photovoltaic safe shutdown, disconnect wind-powered electricity generation unit switch, photovoltaic switch;
K) when in the operating time, judge whether the generated output of wind-light storage system is less than plant area's load power, i.e. P3<P1, meets the demands, and judges the meritorious P1 >=setting threshold of electrical network input; Energy storage device is selected to stabilize honourable output pulsation or the recovery of peak load shifting algorithm and offered load needs according to stabilizing algorithm according to setting;
L), in the time of P1 >=setting threshold, set Pwind-max;
M) when P1≤setting threshold, set Pwind-max and judge whether Pwind-max calculated value is less than or equal to 0, satisfies condition, set aerogenerator unit safe and shut down;
N) after aerogenerator unit safe is shut down, while again judging P1≤setting threshold, photovoltaic and energy storage device safe shutdown.
The dispatch command of described energy management supervisory control system is delivered to the generating equipment of generating and energy-storage system, the operational factor of the generating equipment of generating and energy-storage system is read in timing simultaneously, for example: the operational factors such as real-time active power, reactive power, output frequency, malfunction.Energy management supervisory control system will be carried out coordinated scheduling control according to wind-light storage micro-grid system load condition and current each generating equipment.
Described generating with the generating equipment access way of energy-storage system is: wind-driven generator is connected with low-voltage bus bar by step-down transformer, and photovoltaic generation group is connected to low-voltage bus bar.
Described distribution and protection system:
1 power control
Normally work in order not affect on-site important load, according to plant area's operating mode difference, reality is the load power Pload of plant area, in the time that energy management supervisory control system detects that electrical network input active-power P 1 is less than setting threshold, reduce immediately exerting oneself of wind turbine generator and photovoltaic generation unit, wherein: in the time that exerting oneself of wind turbine generator and photovoltaic generation unit is reduced to 0, electrical network input active-power P 1 excises wind-light storage micro-grid system while being still less than setting threshold.To ensure normal power flow direction.
2 reverse power protection measures
Install the power relay with directivity in wind-light storage micro-grid system lead-in circuit breaker side, power relay is used for judging power direction, the electric current of power relay comes from the electric current at wind-light storage micro-grid system switch cubicle lead-in circuit breaker place, and the voltage of power relay comes from the primary voltage at the lead-in circuit breaker place of generating and energy-storage system; In the time occurring that wind-light storage micro-grid system falls the inverse probability situation of power transmission to electrical network, reverse power protection action, disconnects generating and energy-storage system.
Described data acquisition system comprises digital analog I O harvester, relay equipment and electric energy meter, protection measure and control device and automatic weather station, wherein:
Analog signal IO acquisition function is mainly realized by PLC, the main analog signal gathering comes from the power transducer of wind, light, the each generating equipment of storage and plant area's load place each point, transformer both sides voltage, current transformer, the signal of telecommunication of passing back with dry Transformer Temperature Controller case; Main number signal comes from each circuit breaker on off operating mode or protective device operate condition in system, and PLC drives digital output port to realize the telemechanical operation of the circuit breaker to bus in system simultaneously;
Relay equipment and electric energy meter, protection measure and control device transmit the distribution system parameters such as the each node power of wind-light storage micro-grid system, voltage, electric current, electric energy, fault for timing, the foundation as energy management supervisory control system to the monitoring of wind-light storage micro-grid system and control;
Automatic weather station is used for gathering real-time meteorological data, as: wind speed, wind direction, temperature, humidity, radiation; Provide Data support to generated power forecasting; Meanwhile, occurring in bad weather condition situation, as the foundation of energy management supervisory control system starting protection function.
Electrical network remote scheduling power distribution automation solution is, by optical-fibre communications, energy management computer set up to communication with ownership transformer station and is connected, realizes belonging to transformer station, by the present invention, whole wind-light storage micro-grid system being carried out to scheduling controlling.
Beneficial effect of the present invention is as follows:
The present invention sets up actual wind-light storage micro-grid system in somewhere; EMS; by generating and energy-storage system in data acquisition acquisition system; plant area's load; real time execution parameter and the state of distribution and protection system etc., and according to running status, complete the power control of wind generator system, photovoltaic generating system, energy-storage system; guarantee that power is that electrical network flows to power load, and ensure the stable of frequency, active power.The each unit of wind-light storage can safety grid-connection operation, in the time of plant area's load variations, EMS to the each unit of wind-light storage open, stop, power control, the each unit of wind-light storage can safe and stable operation, only to plant area's load power supply, not to large grid transmission.Receive electrical network remote scheduling simultaneously, and can issue the page by Internet remote access.
Embodiment
Wind-light storage micro-grid system is substantially by energy management supervisory control system, and six parts such as generating and energy-storage system, plant area's load, distribution and protection system, data acquisition system, system group network form.Setting up communication by the network switch with electricity generation system, energy-storage system, distribution and protection system, data acquisition system and remote scheduling and supervisory control system by energy management supervisory control system is connected.
Energy management supervisory control system is the control core of whole wind-light storage micro-grid system, mainly comprises fault detect flow process, master control flow process and troubleshooting process aspect Functional Design.According to cutting and the difference of state and power control enabler flags position of current main switch, monitoring software is in different states.The different conditions of corresponding monitoring software, carries out corresponding master control flow process or troubleshooting process, determines the interior each power supply of microgrid and loads under different operating modes, all can reach the effective control to microgrid internal power, guarantees that power flow direction meets the demands.EMS (being structured on database server), remote scheduling are all connected with switch with supervisory control system, remote server, realize the object with micro-grid system Communication Control.Remote monitoring work station can be accessed remote server by Internet, and then accessing database server, realizes the object of the ruuning situation of monitoring wind-light storage experimental system.
As shown in Figure 1, in wind-light storage micro-grid system, include the energy storage device of at least one wind turbine generator, at least one photovoltaic generation unit, at least one lithium battery, be connected with energy management supervisory control system by switch.The dispatch command of energy management supervisory control system is delivered to each generating equipment, and each generating equipment such as the operational factor such as active power, reactive power, output frequency, malfunction is in real time read in simultaneously timing.Energy management supervisory control system will be carried out coordinated scheduling control according to wind-light storage micro-grid system load condition and current each generating equipment.
Generating equipment access way is: wind-driven generator is connected with low-voltage bus bar by step-down transformer.Photovoltaic generation group is connected to low-voltage bus bar.
The power-supply system of wind-light storage micro-grid system, is attracted by local power network line.Plant area's load mainly comprises that complex factories are produced load and load in living area.
Being incorporated into the power networks is the conventional operation mode of this pilot system.Blower fan, photovoltaic generation group and energy-storage system of accumulator are incorporated to plant area's electrical network.Blower fan and photovoltaic generation group, to the power supply of on-site load, because its energy output is subject to such environmental effects very large, are stabilized intrasystem meritorious fluctuation by energy-storage system of accumulator, and the each switch of system is controlled according to grid-connected operating state by energy management supervisory control system.
1) power flow direction
From power balance result, on weekdays daytime, night and nonworkdays daytime, the energy output of wind-powered electricity generation and photoelectricity is less than the burden requirement of full factory.In nonworkdays night, restriction system inner blower maximum power, blower fan is exerted oneself and can not be greater than load aggregate demand.Therefore can accomplish that in pilot system, renewable energy power generation amount is only personal for plant area's load, can be to electrical network electricity sent outside.Specifically, on direction of tide, gaining merit that blower fan and photovoltaic send only can flow into the load on bus, and can not flow into electric power system through bus.
2) power control
Normally work in order not affect on-site important load, according to plant area's operating mode difference, reality is the load power Pload of plant area, in the time that energy management supervisory control system detects that electrical network input active-power P 1 is less than setting threshold, reduce immediately exerting oneself of wind turbine generator and photovoltaic generation unit, wherein: in the time that exerting oneself of wind turbine generator and photovoltaic generation unit is reduced to 0, electrical network input active-power P 1 excises wind-light storage micro-grid system while being still less than setting threshold.To ensure normal power flow direction.
3) inverse probability
As shown in Figure 2, the electrical main connecting wire of whole system is simplified as follows: regard bus as a voltage node 1, wind-light storage electricity generation system high-pressure side is regarded a voltage node 2 as, load on whole 1 bus is equivalent to a branch road, load bus is 3, and whole system can abbreviation be a two ends Power supply network.
In the time there is inverse probability phenomenon, intrasystem trend flow direction is as an accompanying drawing 2(left side) as shown in.Now wind-light storage electricity generation system has been carried power to grid side.Therefore, the trend flow direction allowing in system while being incorporated into the power networks can only be as shown in Fig. 2 (right side), that is: load branch circuit obtains meritorious and idle from two voltage nodes.Owing to only having a load branch circuit in this equivalent system, there is no other branch, therefore, load bus 3 is exactly the power branch in network, is also the voltage minimum point in network; In Fig. 2, CB1 is that electrical network service entrance switch, CB2 are that the grid-connected switch of wind-light storage, P1+ Q1 are the generating gross power (active power+reactive power) of electrical network electrical network input general power (active power+reactive power), P2+Q2 wind-light storage system.
From above tidal current analysis, as long as ensure that the voltage (being busbar voltage) of load bus 3, lower than the voltage of 1,2 two voltage node, just there will not be electric power to send outside.And the voltage of voltage node 1 belongs to the scope of dispatching of power netwoks, uncontrollable, the voltage of load bus 3 also can change according to the fluctuation of network load etc., unadjustable, therefore can only be by controlling the voltage of voltage node 2, by controlling wind-light storage low-pressure side bus voltage, prevent inverse probability phenomenon.
4) reverse power protection measure
In order in monitor network, whether inverse probability to have occurred in real time, can judge power direction with the power relay of directivity in lead-in circuit breaker installing.In the time there is inverse probability situation, reverse power protection action tripping, disconnect wind-light storage system.In conjunction with actual conditions, can further adopt low forward power protection to obtain larger protection range.
Wind-light storage micro-grid system key data collecting device has: digital analog I O harvester, relay equipment and electric energy meter, protection measure and control device and automatic weather station
Simulation with I O acquisition function is mainly realized by PLC, main collection analog signal comes from the power transducer of wind, light, the each generating equipment of storage and plant area's load place each point, transformer both sides voltage, current transformer, the signal of telecommunication of passing back with dry Transformer Temperature Controller case; Main number signal comes from each circuit breaker on off operating mode or protective device operate condition in system, and PLC drives digital output port to realize the telemechanical operation of the circuit breaker to bus in system simultaneously.
Relay equipment and electric energy meter, protection measure and control device major function are the each node powers of timing transmission system, voltage, electric current, electric energy, the distribution system health parameters such as fault, as EMS to system monitoring with control foundation.
Automatic weather station major function is: gather real-time meteorological data as wind speed, wind direction, temperature, humidity, radiation; Provide Data support to wind power generation and photovoltaic generation power prediction; Simultaneously occurring in bad weather condition situation, as the foundation of EMS starting protection function.
Electrical network remote scheduling power distribution automation solution is, by optical-fibre communications, energy management computer set up to communication with ownership transformer station and is connected, realizes belonging to transformer station, by the present invention, whole wind-light storage micro-grid system being carried out to scheduling controlling.
EMS selects corresponding remote pages to carry out long-range issue remote monitoring work station the running status of the wind generator system in wind-light storage micro-grid system, photovoltaic generating system, energy-storage battery system and distribution and protection can access remote server by Internet; and then accessing database server, the object of the ruuning situation of realization monitoring wind-light storage micro-grid system.
System of the present invention is for realizing equipment centralized control in system, corresponding electrical network remote scheduling simultaneously, and possess Internet remote access function.