Generator on-site on-line acquisition device and monitoring systemTechnical Field
The utility model relates to a generator is online collection system and monitoring system on spot.
background
The large-scale power grid generally comprises a plurality of generator sets which run in parallel, the running safety and control performance of the generator sets and the power grid are mutually influenced and restricted, and a generator excitation system and a speed regulating system are the most important links for connecting the generator sets and the power grid. The accurate control of the mathematical model and the characteristic parameters of the excitation system and the speed regulation system of each grid-connected unit is an important component part of grid-related parameter management, is one of strong construction and basic work of a smart grid, and is an important component of grid source coordination management.
At present, the management of a power grid on a generator excitation system and a speed regulation system is mainly realized by means of grid-related tests and technical supervision, the dynamic response performance of the excitation system and the speed regulation system to the change of the power grid is mainly realized by means of offline calculation and field test measurement, and the technical means of continuous monitoring, online tracking and online evaluation are lacked, so that the abnormal state of a certain generator set excitation system and the speed regulation system cannot be judged online, the damping property (whether effective positive damping is provided or not) provided by the excitation system in power grid oscillation cannot be evaluated online, the correctness of the action of an excitation limiting function cannot be judged online, and the real-time performance of power grid fault prevention and fault response is influenced. Therefore, the real-time management of parameters and variables of the excitation system and the speed regulation system of the generator set is enhanced, and the on-line judgment of dynamic response is imperative.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a generator on-site on-line acquisition device and a monitoring system, which can help the power grid and the power plant to know the dynamic response curve of the speed regulating system and the excitation system in real time; furthermore, in the power grid disturbance process, the dynamic response process and indexes of each generator speed regulating system and each excitation system can be mastered in real time, the dynamic behaviors of the generator speed regulating systems and the excitation systems are monitored really, the response effectiveness of the generator speed regulating systems and the excitation systems can be analyzed conveniently and subsequently, and the static, dynamic and transient stability of the power grid can be improved effectively.
For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
The utility model provides a generator is online collection system on spot, is including setting up the speed governing acquisition unit and the excitation acquisition unit of setting in every generator set DEH screen (DEH screen is the steam turbine digital electro-hydraulic control system screen) or DCS screen (DCS screen is the decentralized control system screen of power plant) side at every generator excitation screen (excitation screen is the generator excitation control system screen) side, speed governing acquisition unit and excitation acquisition unit all include DSP treater and 4-20 mA direct current volume acquisition unit, 4-20 mA direct current volume acquisition unit all links to each other with the DSP treater through the AD converter:
The speed regulation acquisition unit further comprises an optical coupling isolation unit and an RS485 communication unit which are connected with the DSP processor of the speed regulation acquisition unit, and the DSP processor of the speed regulation acquisition unit is connected with the positive power supply + E of the operation loop through an outlet relay;
the excitation acquisition unit further comprises an optical coupling isolation unit, an RS485 communication unit and an alternating current sampling unit which are connected with the DSP processor of the excitation acquisition unit, the alternating current sampling unit comprises a voltage transformer for acquiring voltage and a current transformer for acquiring current, and the DSP processor of the excitation acquisition unit is connected with the positive power supply + E of the operation loop through an outlet relay.
Preferably, the DSP processors are DSPIC33FJ128GP708, the RS485 communication units are ADM3485EAR, the A/D converters are ADS8555SPMR, and the optical coupling isolation units are TCET 1103.
Preferably, each speed regulation acquisition unit and each excitation acquisition unit are provided with a display and a printing connection terminal.
Preferably, the alternating current sampling unit is connected with the DSP processor of the excitation acquisition unit through an A/D converter.
correspondingly, the generator on-site on-line monitoring system comprises a monitoring host and any one of the generator on-site on-line acquisition devices, wherein each speed regulation acquisition unit and each excitation acquisition unit are connected with the monitoring host, and the speed regulation acquisition units, the excitation acquisition units and the monitoring host are subjected to time synchronization through the time synchronization device.
Preferably, the monitoring host is connected with the engineer station through a switch.
Preferably, the monitoring host comprises a CPU, an alternating current sampling unit, an A/D converter, an outlet relay and a communication DSP processor group, the CPU is respectively connected with each speed regulation acquisition unit and each excitation acquisition unit through the communication DSP processor group, the alternating current sampling unit is connected with the CPU through the A/D converter, and the CPU is connected with an operation loop positive power supply + E through the outlet relay.
the utility model has the advantages that:
compared with the prior art, the invention constructs a two-stage system of a monitoring host machine and a data acquisition unit of a power plant station, and realizes large-scale data acquisition, uploading, unified display and management of excitation and speed regulation systems of a plurality of units of the power plant; the method and the device can timely acquire key variables and parameters of the generator set, facilitate offline analysis and evaluation display after the fact, play the roles of disturbance analysis and fault early warning of a monitoring system, and improve the autonomous analysis and evaluation level of the power grid on system disturbance.
Drawings
Fig. 1 is a schematic structural diagram of a speed regulation acquisition unit of the present invention;
Fig. 2 is a schematic structural diagram of the excitation collecting unit of the present invention;
Fig. 3 is a schematic structural diagram of the monitoring host of the present invention;
FIG. 4 is a block diagram of a local on-line monitoring system for a generator according to the present invention;
Fig. 5 is a schematic structural diagram of a generator on-site on-line monitoring system of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not limited to the present invention.
An on-site on-line acquisition device for generators comprises a speed regulation acquisition unit arranged at the DEH screen or DCS screen side of each generator set and an excitation acquisition unit arranged at the excitation screen side of each generator, as shown in fig. 1, the speed regulation acquisition unit comprises a DSP processor, a 4-20 mA direct current acquisition unit, an optical coupling isolation unit and an RS485 communication unit which are connected with the DSP processor of the speed regulation acquisition unit, the DSP processor of the speed regulation acquisition unit is connected with a positive power supply + E of an operation loop through an outlet relay, the 4-20 mA direct current quantity acquisition unit is connected with the DSP through an A/D converter, and directly acquires 6 direct current electrical quantities of excitation voltage Uf, excitation current If, output Upss (a static stabilizer of a power system), given voltage Uref, control voltage Uk and output Upsvr (a generator excitation adjusting device) of the excitation voltage Uf, the excitation current If and the PSS (a static stabilizer of the power system). And the external input signal is connected with the DSP processor through the optical coupling isolation unit.
the speed regulation acquisition unit acquires or acquires the main electrical quantity of the unit in real time, receives the important control quantity and the state output quantity output by the excitation system, and can acquire the gateway key parameters and the main state event information of the excitation regulator through communication to comprehensively reflect the running state of the unit and the state of the excitation system. The speed regulation acquisition unit can acquire DEH output quantity, inquire speed regulation operation data of the DCS system and acquire the state of a hard contact of the DEH or the DCS. Wherein, the DEH output quantity refers to: important intermediate control quantity with higher requirements on important analog quantity or real-time property of speed-regulating DEH equipment of a power plant, such as: the system comprises a steam turbine rotating speed (difference), generator power, main valve front steam pressure, regulation stage steam pressure, reheating outlet steam pressure, intermediate pressure cylinder exhaust steam pressure, DEH side theoretical frequency modulation power and a total valve position instruction. The speed regulation operation data of the DCS system is as follows: the control system comprises the parameters and state quantities of the speed regulating system such as the opening degree of each valve, a load instruction, a frequency modulation parameter or a regulating coefficient, a PLU action signal, primary frequency modulation input, primary frequency modulation action and the like.
Preferably, the speed regulation acquisition unit is further provided with a display and a printing connection terminal, for example, a power supply liquid crystal display, and a CPU can be additionally added, and the display and the printing connection terminal are connected with the DSP processor through the CPU.
as shown in fig. 2, the excitation collecting unit includes a DSP processor, a 4-20 mA dc collecting unit, an optical coupling isolation unit connected to the DSP processor of the excitation collecting unit, an RS485 communication unit, and an ac sampling unit, where the 4-20 mA dc collecting unit is connected to the DSP processor through an a/D converter, and the 4-20 mA dc collecting unit directly collects 6 paths of dc electrical quantities of an excitation voltage Uf, an excitation current If, a PSS (power system static stabilizer) output Upss, a voltage given Uref, a control voltage Uk, and a PSVR (generator excitation adjusting device) output upssvr. The alternating current sampling unit comprises a voltage transformer PT for collecting voltage and a current transformer CT for collecting current, the alternating current sampling unit is connected with an excitation collection unit DSP processor through an A/D converter, and the excitation collection unit DSP processor is connected with an operation loop positive power supply + E through an outlet relay.
The excitation acquisition unit can acquire terminal voltage/current, system voltage, an excitation voltage/current transmitter, AVR control quantity output and main hard contact states, and acquire AVR excitation parameter and state events. Wherein, the AVR control quantity refers to: control voltages Uk, PSS, voltage set and PSVR, etc.; the AVR excitation grid-related parameters are as follows: AVR main ring (voltage ring) PID parameter, low excitation/over excitation limiting auxiliary ring parameter, difference adjusting parameter and PSS model parameter; the AVR excitation state event refers to: fault information, alarm information, limit information, and operational status information of the AVR.
Each excitation acquisition unit is provided with a display and a printing connection terminal, for example, a power supply liquid crystal display can be additionally provided with a CPU, and the display and the printing connection terminal are connected with the DSP through the CPU.
The acquisition unit has fast and slow communication modes, fast communication means that the AVR has external fast communication conditions (such as optical fibers), and the acquisition device receives AVR data through the fast communication interface, so that an analog quantity sampling link is omitted; the slow communication means that the excitation acquisition unit communicates with an RS485 serial port of the AVR, and the acquisition device respectively realizes interaction with an A/B set of AVR through 2 paths of RS485 serial ports by a modbus protocol to acquire networking parameters and state information of the excitation AVR; and the obtained constant value and state event are managed in a classified mode.
In the specific implementation process, the same name can be the same model, preferably, the model is as follows: DSP processors are DSPIC33FJ128GP708, RS485 communication units are ADM3485EAR, A/D converters are ADS8555SPMR, and optical coupling isolation units are TCET 1103.
As shown in fig. 4 and 5, the generator on-site on-line monitoring system comprises a monitoring host and a generator on-site on-line acquisition device according to any one of the above, wherein each speed regulation acquisition unit and each excitation acquisition unit are connected with the monitoring host, and each speed regulation acquisition unit, each excitation acquisition unit and the monitoring host perform time synchronization through a time synchronization device. And each acquisition unit is transmitted to the plant monitoring host through optical fiber communication according to an IEC 60044-8 protocol. In fig. 5, the parameters have the following meanings: ig: terminal current; ug: terminal voltage; and (Uf): an excitation voltage; if: exciting current; usys is the system voltage; PSS: power system static stabilizer parameters.
The monitoring host collects the information of the unit excitation and the speed control system uploaded by all the speed control acquisition units and the excitation acquisition units, and the monitoring host can also be accessed to an engineer station, and in the figure 4, the monitoring host is connected with the engineer station through a switch, so that the operating personnel of the power plant can know the operation condition of the unit excitation and the speed control system at the engineer station on the spot.
As shown in fig. 3, the monitoring host includes a CPU, an ac sampling unit, an a/D converter, an outlet relay, and a communication DSP processor group (in the figure, the communication DSP processor group includes only DSP1 and DSP2), the CPU is connected to each speed regulation acquisition unit and each excitation acquisition unit through the communication DSP processor group, the ac sampling unit is connected to the CPU through the a/D converter, and the CPU is connected to the positive power supply + E of the operation loop through the outlet relay.
Preferably, the monitoring host further comprises a display and a print connection terminal, and the CPU is LPC2119FBD 64. In order to realize the on-line monitoring of the excitation and speed regulation systems of all the generator sets of the station, a two-stage mode of an excitation/speed regulation acquisition unit (a slave machine) and a station monitoring host machine is adopted.
Compared with the prior art, the invention constructs a two-stage system of a monitoring host machine and a data acquisition unit of a power plant station, and realizes large-scale data acquisition, uploading, unified display and management of excitation and speed regulation systems of a plurality of units of the power plant; the method and the device can timely acquire key variables and parameters of the generator set, facilitate offline analysis and evaluation display after the fact, play the roles of disturbance analysis and fault early warning of a monitoring system, and improve the autonomous analysis and evaluation level of the power grid on system disturbance.
The monitoring system and the dispatching side adopt a dual-channel communication mode, wherein a dynamic real-time protocol transmits fast time-varying data, and an IEC103 communication protocol transmits slow time-varying data, so that the monitoring system can perform online, quasi-online and offline multi-time-domain analysis on various types of data disturbed by the system, and communication resources of the dispatching system are fully and effectively utilized; the communication and data acquisition with the power plant speed regulation DEH, DCS and excitation AVR are realized simultaneously for the first time, high-speed and real-time data are accurately obtained, and the safe and stable operation of the excitation regulator and the speed regulator is not interfered; optical fiber communication is adopted among the devices, the sending interval period is only 1ms, and real-time uploading of excitation and speed regulation acquisition data is realized.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings are utilized, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.