CN117310321A - High/low voltage ride through test system for grid-connected new energy station and application method thereof - Google Patents
High/low voltage ride through test system for grid-connected new energy station and application method thereof Download PDFInfo
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Abstract
The invention discloses a high/low voltage ride through test system of a grid-connected new energy station and an application method thereof, wherein the system comprises a communication module and a high/low voltage ride through test monitoring module of the new energy station; the high/low voltage ride through test monitoring module of the new energy station is used for generating a high/low voltage ride through test instruction and an analog voltage disturbance signal, and is also used for reading real-time data acquired by the synchronous phasor measurement device from the wide area measurement system and calculating an evaluation index of the high/low voltage ride through test performance; the communication module is arranged between the high/low voltage ride through test monitoring module of the new energy station and the substation and is used for sending the high/low voltage ride through test instruction and the analog voltage disturbance signal generated by the high/low voltage ride through test monitoring module of the new energy station to the substation. The system can realize the active online test and the integral evaluation function of the high/low voltage ride through performance of the single machine and the dynamic reactive power regulation device in the grid-connected new energy station.
Description
Technical Field
The invention relates to the technical field of dynamic monitoring of an electric power system, in particular to a high/low voltage ride through test system of a grid-connected new energy station and an application method thereof.
Background
Under the strategies of carbon peak, carbon neutralization and development, new energy with randomness and volatility features will occupy a main share in primary energy production and consumption. The energy transformation and development face the problem of prominent risk of safe and stable operation of the system due to the influence of the power generation characteristics of new energy and the power electronic characteristics of the new energy on the operation of a power grid, and the medium-long-term green low-carbon transformation faces larger pressure. In recent years, fan off-grid events of a new energy station of a power grid frequently occur, and when high/low voltage large disturbance occurs to the power grid, the new energy station cannot keep continuous grid-connected operation and cannot support power grid voltage recovery, so that weak anti-interference capability and supporting capability are exposed. Along with the continuous growth of new energy installation, the influence of grid connection characteristics on the transient stability of the power grid is more remarkable, and the problem of high/low voltage ride through failure of large-scale new energy stations under large disturbance brings great risks to the safe and stable operation of the power grid.
According to the requirements of GB 38755-2019 electric power system safety and stability guidelines issued in 2019, the power supply and the dynamic reactive power regulation equipment have certain tolerance capability to system voltage and frequency fluctuation, and the voltage and frequency tolerance capability of the new energy station and the distributed power supply are basically consistent with the voltage and frequency tolerance capability of the synchronous generator set. In actual implementation, the grid-connected operation of the new energy station needs to provide a high/low voltage ride through test report to prove that the grid-connected unit has the capability of passing through high/low voltage, but the test is a type test, cannot cover all units of the new energy station, and how to effectively evaluate the high/low voltage ride through capability of the new energy station in real time is worth researching. Therefore, a method for monitoring, online testing and evaluating the high/low voltage ride through performance scheduling end of the new energy station is needed.
Disclosure of Invention
In order to solve the defects in the background technology, the invention provides a high/low voltage ride through test system for a grid-connected new energy station and an application method thereof, and the system can realize the active online test and the integral evaluation function of the high/low voltage ride through performance of a single machine and a dynamic reactive power regulating device in the grid-connected new energy station.
In a first aspect, the invention provides a high/low voltage ride through test system for a grid-connected new energy station, which comprises a communication module and a new energy station high/low voltage ride through test monitoring module;
the high/low voltage ride through test monitoring module of the new energy station is used for generating a high/low voltage ride through test instruction and an analog voltage disturbance signal, and is also used for reading real-time data acquired by the synchronous phasor measurement device from the wide area measurement system and calculating an evaluation index of the high/low voltage ride through test performance;
the communication module is arranged between the high/low voltage ride through test monitoring module of the new energy station and the substation and is used for sending the high/low voltage ride through test instruction and the analog voltage disturbance signal generated by the high/low voltage ride through test monitoring module of the new energy station to the substation.
Further, the system also comprises a visual human-computer interface connected with the high/low voltage ride through test monitoring module of the new energy station.
In a second aspect, the present invention provides an application method based on the above-mentioned grid-connected new energy station high/low voltage ride through test system, including:
s1: the main station communicates with the sub-station through a high/low voltage ride through test system of the grid-connected new energy station, and issues test signals to a unit to be tested in the sub-station; the substation tests the unit to be tested according to the test signal, and the synchronous phasor measurement device collects real-time data of the unit test and sends the real-time data to the wide-area measurement system;
s2: the high/low voltage ride through test system of the grid-connected new energy station reads real-time data from the wide area measurement system, and further calculates the high/low voltage ride through test performance evaluation index in real time.
According to the method, based on a wide-area measurement information interaction mechanism of a dispatching end master station and a new energy station terminal station (namely, interaction of data of the master station and the substation can be realized, namely, the master station can send test signals, the substation can upload real-time data and the like), dispatching center operators at the master station side send analog voltage disturbance signal data to a single machine or a dynamic reactive power regulating device in the new energy station through a grid-connected new energy station high/low voltage traversing system, high/low voltage traversing performance indexes are calculated according to national standards according to the interaction information of the dispatching center and the new energy station, the analog voltage disturbance signal data and the real-time data sent by a synchronous phasor measuring device, and the high/low voltage traversing performance test requirements are combined, so that the method has the capability of carrying out comprehensive high voltage traversing, low voltage traversing and low-high voltage continuous traversing test on the new energy station, and realizes active online test and integral evaluation functions of high/low voltage traversing performance of the single machine and the dynamic reactive power regulating device in the new energy station, thereby providing convenience and stability in grid-connected new energy station large-scale and stability in grid-connected operation for dispatching operators.
The specific steps of S1 are as follows:
s11: the master station transmits a high/low voltage ride through readiness signal of the query testing unit to the substation; after receiving the high/low voltage ride through ready state signal of the query testing unit, the substation returns a signal whether the testing can be performed or not to the main station, and when the testing can be performed, the substation returns a positive confirmation signal;
s12: the master station transmits an analog voltage disturbance signal data file to the substation; the substation analyzes the data file of the analog voltage disturbance signal into the analog voltage disturbance signal, and returns a positive confirmation signal after the analysis is finished;
s13: the main station sends a high/low voltage ride through test signal for setting the unit to enter to the substation; the substation receives and sets the high/low voltage ride through test signals of the unit and sends the signals to the unit; after the unit receives a high/low voltage ride through test signal for setting the unit, switching the high/low voltage ride through function of the unit to a high/low voltage ride through active test mode; the substation returns a positive acknowledgement signal to the master station;
s14: the main station sends a high/low voltage ride through test signal of the execution unit to the substation; the substation receives and executes the active high/low voltage ride through test signals of the unit and sends the signals to the unit; after the unit receives the high/low voltage ride through test signal of the executing unit, the unit carries out high/low voltage ride through on-line test according to the analog voltage disturbance signal in S12, and meanwhile, a positive acknowledgement signal is returned to the main station;
s15: after the test is completed, the substation sends a high/low voltage ride through test exit signal to the unit; after the unit receives the high-point voltage crossing exit test signal, the unit exits the high/low voltage crossing active test mode and is switched to the normal running mode of the unit; meanwhile, the substation sends a high/low voltage ride through exit test signal to the master station, and the master station judges whether the high/low voltage ride through active test process is normal or not after receiving the high/low voltage ride through exit test signal.
Further, the method further comprises the following steps: in the test process, the main station has the function of interrupting the high/low voltage ride through test at any time; after the main station does not receive the confirmation signal returned by the substation in the preset time, actively interrupting the high/low voltage ride-through test; and after the substation does not receive a further test signal issued by the main station within a preset time, actively interrupting the high/low voltage ride through test.
Further, the real-time data collected by the synchronous phasor measurement device comprises real-time data of a high/low voltage ride through action signal of the unit, real-time data of active power of the unit, real-time data of reactive power of the unit, real-time data of voltage of the unit and real-time data of current of the unit.
Further, the high/low voltage ride through test performance evaluation index includes: the high/low voltage ride through is at least one of actual and theoretical off-grid run times, high/low voltage ride through actually contributes reactive current and theoretical contributes reactive current, reactive current response time, active power recovery speed.
Further, the specific process of S2 is:
the high/low voltage ride through test system of the grid-connected new energy station reads real-time data from the wide area measurement system;
calculating a high/low voltage ride through test performance evaluation index including at least one of:
the actual off-grid time of the continuous operation of the computer unit is within the duration time from the start to the end of the high/low voltage ride through, and the theoretical off-grid time of the continuous operation of the computer unit is within the duration time from the start to the end of the high/low voltage ride through; if the actual non-offline time of the continuous operation of the unit is greater than or equal to the theoretical non-offline time of the continuous operation of the unit, judging that the high/low voltage ride through action is correct; otherwise, judging that the high/low voltage ride through action is incorrect;
the actual reactive current increment contributed by the unit in the duration from the beginning to the end of the high/low voltage ride through is calculated, and the theoretical reactive current increment contributed by the unit in the duration from the beginning to the end of the high/low voltage ride through is calculated; if the actual reactive current increment contributed by the unit is greater than or equal to the theoretical reactive current increment contributed by the unit, judging that the high/low voltage ride through action is qualified; otherwise, judging that the high/low voltage ride through action is not qualified;
and evaluating the high/low voltage ride through capability of the grid-connected new energy station by calculating and counting the correct action rate of the high/low voltage ride through of the unit and/or the qualification rate of the high/low voltage ride through of the unit.
Advantageous effects
The invention provides a high/low voltage ride through test system of a grid-connected new energy station and an application method thereof, wherein the method is based on a wide area measurement information interaction mechanism of a dispatching end master station and a new energy station terminal station, and an active online test and overall evaluation function of high/low voltage ride through performance of a single machine and a dynamic reactive power regulation device in the new energy station are realized by issuing analog voltage disturbance signal data to the new energy station by dispatching center operation personnel at the master station side, and the dispatching center operation personnel can quickly master and monitor the high/low voltage ride through capacity of the new energy station in real time according to interaction information of the dispatching center and the new energy station, the analog voltage disturbance signal data and real-time data sent by a synchronous phasor measurement device, calculate high/low voltage ride through performance indexes according to national standards, combine high/low voltage ride through performance assessment requirements, and have the capability of fully developing high voltage ride through, low voltage ride through and low-high voltage continuous ride through tests for the new energy station, and provide convenience for the dispatching operation personnel to actively handle the safety and stability of grid-connected new energy station operation.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a high/low voltage ride through test system for a grid-connected new energy station provided by an embodiment of the invention;
FIG. 2 is a flow chart of a method for testing high/low voltage ride through of a grid-connected new energy station according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a communication method of a master station and a slave station according to an embodiment of the present invention;
fig. 4 is a calculation flow chart of the high/low voltage ride through test monitoring module of the new energy station according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Example 1
In the embodiment of the invention, the master station is arranged in the dispatching center, and the substations are arranged in the new energy stations.
As shown in FIG. 1, the high/low voltage ride through test system of the grid-connected new energy station comprises a communication module and a high/low voltage ride through test monitoring module of the new energy station;
the high/low voltage ride through test monitoring module of the new energy station is used for generating a high/low voltage ride through test instruction and an analog voltage disturbance signal, and is also used for reading real-time data acquired by the synchronous phasor measurement device from the wide area measurement system and calculating an evaluation index of the high/low voltage ride through test performance;
the communication module is arranged between the high/low voltage ride through test monitoring module of the new energy station and the substation and is used for sending the high/low voltage ride through test instruction and the analog voltage disturbance signal generated by the high/low voltage ride through test monitoring module of the new energy station to the substation.
In specific implementation, the master station side dispatching center operator prepares to perform high/low voltage ride through test: the high/low voltage ride through test monitoring module of the new energy station generates a high/low voltage ride through test instruction and an analog voltage disturbance signal according to unit information to be tested in the substation, wherein the unit to be tested comprises at least one of a fan/photovoltaic and a dynamic armed compensation device inside the new energy station; the communication module in the grid-connected new energy station high/low voltage ride through test system is communicated with the substation, a high/low voltage ride through test instruction and an analog voltage disturbance signal generated by the new energy station high/low voltage ride through test monitoring module are sent to the substation, and the substation tests according to the received test signal and sends the tested real-time data to the wide area measurement system in the master station; the high/low voltage ride through test monitoring module of the new energy station in the main station reads real-time data acquired by the synchronous phasor measurement device from the wide area measurement system, and calculates an evaluation index of the high/low voltage ride through test performance. The system can realize the active online test and overall evaluation functions of the high/low voltage ride through performance of the single machine and the dynamic reactive power regulation device in the grid-connected new energy station, provides convenience for dispatching operators to quickly master and monitor the high/low voltage ride through capacity of the grid-connected new energy station in real time, and actively handles the safety and stability challenges brought by large-scale grid-connected new energy operation.
Example 2
The embodiment provides a high/low voltage ride through test system of a grid-connected new energy station, which is different from embodiment 1 in that the system further comprises a visual human-computer interface connected with a high/low voltage ride through test monitoring module of the new energy station. The visual human-computer interface can comprise five sub-interfaces of a real-time operation monitoring module, a history test recording module, a curve inquiring module, an examination statistics module and a parameter setting module.
The real-time operation monitoring module is used for recording the high/low voltage ride through test conditions of the new energy station in daily and high/low voltage ride through test states, including second-level real-time data monitoring such as new energy station names, local cities, grid-connected voltage levels, the number and types of units, the last test time and results, station topology and grid-connected state monitoring, test voltage data curves, real-time high/low voltage ride through action signal curves, real-time voltage curves, reactive current curves and the like;
the history test recording module is used for recording the high/low voltage ride through test history conditions of the new energy station, including the name of the test station, the place city, the model and number of the test unit, the test time, the test times, the fault type, the test result and the like;
the curve inquiry module is used for displaying action curves and index results of the unit during the high/low voltage ride through test, and comprises a test voltage disturbance signal curve, an actual voltage curve, a test voltage curve, an actual non-off-grid running time, a theoretical non-off-grid running time, actual contribution reactive current of the high/low voltage ride through, theoretical contribution reactive current, reactive current response time, active power recovery speed, whether the unit is qualified or not and whether the unit is free from checking or not;
the examination statistics module is used for inquiring the results of the high/low voltage ride through test of the new energy station in a preset time period, checking-free time period and examination electric quantity display, and can be organized into a report form, and has a file export function for use and examination of dispatching operators;
the parameter setting module is used for setting parameters of the unit during high/low voltage ride through test, such as unit type and model, unit number, access voltage class, unit grid-connected capacity and the like.
Example 3
The embodiment provides an application method of the grid-connected new energy station high/low voltage ride through test system based on the embodiment 1 or 2. Comprising
As shown in fig. 2, the embodiment provides a method for testing high/low voltage ride through of a grid-connected new energy station, which includes:
s1: the method comprises the steps that a main station communicates with a substation through a high/low voltage ride through test system of a grid-connected new energy station, and sends test signals to a unit to be tested in the substation, wherein the unit to be tested comprises at least one of a fan/photovoltaic and a dynamic armed force compensation device in the new energy station; and the substation tests the device to be tested after receiving the test signal, and simultaneously the synchronous phasor measurement device collects the real-time data of the test and sends the real-time data to the wide area measurement system.
Specifically, the grid-connected new energy station high/low voltage ride through test system comprises a communication module and a new energy station high/low voltage ride through test monitoring module; the high/low voltage ride through test monitoring module of the new energy station is used for generating a high/low voltage ride through test instruction and an analog voltage disturbance signal; the method is used for reading real-time data acquired by the synchronous phasor measurement device from the wide-area measurement system, and further calculating an evaluation index of high/low voltage ride-through test performance in real time; the communication module is arranged between the high/low voltage ride through test monitoring module of the new energy station and the substation and is used for sending the high/low voltage ride through test instruction and the analog voltage disturbance signal generated by the high/low voltage ride through test monitoring module of the new energy station to the substation. As shown in fig. 1, the master station and the sub-stations communicate by establishing a communication channel through a shop scheduling data network, and allocating a data network IP to each new energy station sub-station; the bottom communication protocol adopts TCP, and according to the application protocol agreed by the master station and the substations, the master station designates a device (namely at least one of a fan/photovoltaic device and a dynamic reactive power compensation device in the new energy station) to the substations through a grid-connected new energy station high/low voltage ride through test system, and issues a test signal for developing a high/low voltage ride through test. The test signal includes: inquiring a high/low voltage ride through ready state signal of the unit, simulating a voltage disturbance signal data file, setting a high/low voltage ride through test signal of the unit, and executing the high/low voltage ride through test signal of the unit, wherein the signals are used as the basis for regulating the substation.
More specifically, as shown in fig. 3, the specific steps of S1 are:
s11: the master station transmits a high/low voltage ride through readiness signal of the query testing unit to the substation; after receiving the high/low voltage ride through ready state signal of the query testing unit, the substation returns a signal whether the testing can be performed or not to the main station, and when the testing can be performed, the substation returns a positive confirmation signal;
s12: the master station transmits an analog voltage disturbance signal data file to the substation; the substation analyzes the data file of the analog voltage disturbance signal into the analog voltage disturbance signal, and returns a positive confirmation signal after the analysis is finished;
s13: the main station sends a high/low voltage ride through test signal for setting the unit to enter to the substation; the substation receives and sets the high/low voltage ride through test signals of the unit and sends the signals to the unit; after the unit receives a high/low voltage ride through test signal for setting the unit, switching the high/low voltage ride through function of the unit to a high/low voltage ride through active test mode; the substation returns a positive acknowledgement signal to the master station;
s14: the main station sends a high/low voltage ride through test signal of the execution unit to the substation; the substation receives and executes the active high/low voltage ride through test signals of the unit and sends the signals to the unit; after the unit receives the high/low voltage ride through test signal of the executing unit, the unit carries out high/low voltage ride through on-line test according to the analog voltage disturbance signal in S12, and simultaneously returns a positive acknowledgement signal to the main station;
s15: after the test is completed, the substation sends a high/low voltage ride through test exit signal to the unit; after the unit receives the high-point voltage crossing exit test signal, the unit exits the high/low voltage crossing active test mode and is switched to the normal running mode of the unit; meanwhile, the substation sends a high/low voltage ride through exit test signal to the master station, and the master station judges whether the high/low voltage ride through active test process is normal or not after receiving the high/low voltage ride through exit test signal.
Preferably, in the test process, the main station has the function of interrupting the high/low voltage ride through test at any time; after the main station does not receive the confirmation signal returned by the substation in the preset time, actively interrupting the high/low voltage ride-through test; and after the substation does not receive a further test signal issued by the main station within a preset time, actively interrupting the high/low voltage ride through test.
S2: the high/low voltage ride through test system of the grid-connected new energy station reads real-time data acquired by the synchrophasor measurement device, and calculates the high/low voltage ride through test performance evaluation index in real time.
Specifically, the real-time data collected by the synchronous phasor measurement device comprises real-time data of high/low voltage ride through action signals of the unit, real-time data of active and reactive power of the unit, and real-time data of voltage and current of the unit.
More specifically, before S1, the method further includes:
s01: the high/low voltage ride through test system of the grid-connected new energy station reads the configuration parameters for test, the model information of the main station, the model information of the sub station and the model information of the unit and initializes the system;
s02: and the high/low voltage ride through test system of the grid-connected new energy station generates a high/low voltage ride through test analog voltage disturbance signal data file and performs local storage.
Wherein, the high/low voltage ride through test performance evaluation index comprises: the high/low voltage ride through is at least one of actual and theoretical off-grid run times, high/low voltage ride through actually contributes reactive current and theoretical contributes reactive current, reactive current response time, active power recovery speed.
In specific implementation, as shown in fig. 4, a new energy station high/low voltage ride through test monitoring module in a grid-connected new energy station high/low voltage ride through test system reads configuration parameters for test from a configuration table in a wide area measurement system database, wherein the configuration parameters comprise a unit type and model, a primary wiring diagram in the new energy station, an access voltage level, a unit grid-connected capacity, a grid-connected switch state, a grid-connected state and the like; reading new energy stations and equipment model information from a model table of a database; the high/low voltage ride through test monitoring module of the new energy station reads real-time dynamic data from the time sequence real-time library; when the high/low voltage crossing test signal is monitored, reading analog voltage disturbance signal data from a voltage file; judging whether a high/low voltage ride through action signal of the test unit is set to be 1 or not; after the high/low voltage ride through action signal is set to 1, judging whether the set voltage, reactive current and active power response meet preset thresholds or not, wherein the preset thresholds of the set voltage, reactive current and active power response in the embodiment are set according to national standards; finally, according to the technical specification of the wind power plant access power system of < < GB/T19963.1-2021 published in 2021 of national standard of the people's republic of China, part 1: the files of < < GB/T19964-2012 photovoltaic power station access power system technical regulation > > published in the land wind power > > and 2012 require that calculated high/low voltage ride through online test index results be written into a system database, and high/low voltage ride through test performance evaluation indexes are calculated, wherein the method comprises at least one of the following steps: the method comprises the steps that the actual non-offline time of the continuous operation of a computer unit is calculated in the duration time from the start to the end of high/low voltage ride through, the theoretical non-offline time of the continuous operation of the computer unit is calculated in the duration time from the start to the end of the high/low voltage ride through, if the actual non-offline time of the continuous operation of the computer unit is greater than or equal to the theoretical non-offline time of the continuous operation of the computer unit, the correct action of the high/low voltage ride through is judged, and otherwise, the incorrect action of the high/low voltage ride through is judged; calculating the actual reactive current increment of the unit contribution in the duration from the beginning to the end of the high/low voltage ride through, and finally calculating the theoretical reactive current increment of the unit contribution in the duration from the beginning to the end of the high/low voltage ride through, and judging that the high/low voltage ride through action is qualified if the actual reactive current increment of the unit contribution is greater than or equal to the theoretical reactive current increment of the unit contribution; otherwise, judging that the high/low voltage ride through action is not qualified. And finally, calculating the correct action rate of high/low voltage ride through of the unit and/or the pass rate of high/low voltage ride through of the unit, and evaluating the ride through capacity of the grid-connected new energy station on the high/low voltage.
Preferably, the test analog voltage disturbance signal data file can be formed by a dispatching center operator according to a high/low voltage crossing typical event, homemade data and the like, and four default files of a system can be provided, wherein the four default files comprise an analog low voltage disturbance signal data file representing a symmetrical fault, an analog low voltage disturbance signal data file representing an asymmetrical fault, an analog high voltage disturbance signal data file and an analog low-high voltage disturbance signal data file representing a rapid transition of low voltage to high voltage.
According to the embodiment of the invention, based on a wide area measurement information interaction mechanism of a dispatching terminal master station and a new energy station terminal station, by issuing analog voltage disturbance signal data to a single machine or a dynamic reactive power regulation device in the new energy station by a dispatching center operator at the master station side, according to interaction information of the dispatching center and the new energy station, the analog voltage disturbance signal data and real-time data sent by a synchronous phasor measurement device, a high/low voltage ride-through performance index is calculated according to national standards, and the high/low voltage ride-through performance assessment requirement is combined, so that the system has the capability of developing comprehensive high voltage ride-through, low voltage ride-through and low-high voltage continuous ride-through tests for the new energy station, realizes the active online test and integral evaluation functions of the high/low voltage ride-through performance of the single machine and the dynamic reactive power regulation device in the new energy station, provides convenience for the dispatching operator to quickly master and monitor the high/low voltage ride-through capacity of the new energy station in real time, and actively handles the safety and stability challenges brought by large-scale new energy grid-connected operation.
In engineering implementation, the system can be operated to operate under the condition that the basic environment of the intelligent power grid dispatching control system platform can normally operate and the wide area measurement system is correctly deployed, so that the system is very simple and easy to use.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (8)
1. The high/low voltage ride through test system of the grid-connected new energy station is characterized by comprising a communication module and a high/low voltage ride through test monitoring module of the new energy station;
the high/low voltage ride through test monitoring module of the new energy station is used for generating a high/low voltage ride through test instruction and an analog voltage disturbance signal, and is also used for reading real-time data acquired by the synchronous phasor measurement device from the wide area measurement system and calculating an evaluation index of the high/low voltage ride through test performance;
the communication module is arranged between the high/low voltage ride through test monitoring module of the new energy station and the substation and is used for sending the high/low voltage ride through test instruction and the analog voltage disturbance signal generated by the high/low voltage ride through test monitoring module of the new energy station to the substation.
2. The grid-tied new energy station high/low voltage ride through test system of claim 1, further comprising a visual human-machine interface coupled to the new energy station high/low voltage ride through test monitoring module.
3. An application method of the grid-connected new energy station high/low voltage ride through test system according to claim 1 or 2, comprising the following steps:
s1: the main station communicates with the sub-station through a high/low voltage ride through test system of the grid-connected new energy station, and issues test signals to a unit to be tested in the sub-station; the substation tests the unit to be tested according to the test signal, and the synchronous phasor measurement device collects real-time data of the unit test and sends the real-time data to the wide-area measurement system;
s2: the high/low voltage ride through test system of the grid-connected new energy station reads real-time data from the wide area measurement system, and further calculates the high/low voltage ride through test performance evaluation index in real time.
4. The method for applying the grid-connected new energy station high/low voltage ride through test method according to claim 3, wherein the specific steps of S1 are as follows:
s11: the master station transmits a high/low voltage ride through readiness signal of the query testing unit to the substation; after receiving the high/low voltage ride through ready state signal of the query testing unit, the substation returns a signal whether the testing can be performed or not to the main station, and when the testing can be performed, the substation returns a positive confirmation signal;
s12: the master station transmits an analog voltage disturbance signal data file to the substation; the substation analyzes the data file of the analog voltage disturbance signal into the analog voltage disturbance signal, and returns a positive confirmation signal after the analysis is finished;
s13: the main station sends a high/low voltage ride through test signal for setting the unit to enter to the substation; the substation receives and sets the high/low voltage ride through test signals of the unit and sends the signals to the unit; after the unit receives a high/low voltage ride through test signal for setting the unit, switching the high/low voltage ride through function of the unit to a high/low voltage ride through active test mode; the substation returns a positive acknowledgement signal to the master station;
s14: the main station sends a high/low voltage ride through test signal of the execution unit to the substation; the substation receives and executes the active high/low voltage ride through test signals of the unit and sends the signals to the unit; after the unit receives the high/low voltage ride through test signal of the executing unit, the unit carries out high/low voltage ride through on-line test according to the analog voltage disturbance signal in S12, and meanwhile, a positive acknowledgement signal is returned to the main station;
s15: after the test is completed, the substation sends a high/low voltage ride through test exit signal to the unit; after the unit receives the high-point voltage crossing exit test signal, the unit exits the high/low voltage crossing active test mode and is switched to the normal running mode of the unit; meanwhile, the substation sends a high/low voltage ride through exit test signal to the master station, and the master station judges whether the high/low voltage ride through active test process is normal or not after receiving the high/low voltage ride through exit test signal.
5. The method for applying the grid-connected new energy station high/low voltage ride through test method according to claim 3, further comprising: in the test process, the main station has the function of interrupting the high/low voltage ride through test at any time; after the main station does not receive the confirmation signal returned by the substation in the preset time, actively interrupting the high/low voltage ride-through test; and after the substation does not receive a further test signal issued by the main station within a preset time, actively interrupting the high/low voltage ride through test.
6. The method for applying the high/low voltage ride through test method for the grid-connected new energy station according to claim 3, wherein the real-time data collected by the synchrophasor measurement device comprises real-time data of a high/low voltage ride through action signal of a unit, real-time data of active power of the unit, real-time data of reactive power of the unit, real-time data of voltage of the unit and real-time data of current of the unit.
7. The application method of the grid-connected new energy station high/low voltage ride through test method according to claim 1, wherein the high/low voltage ride through test performance evaluation index comprises: the high/low voltage ride-through is at least one of actually and theoretically non-off-grid run-time, and the high/low voltage ride-through actually contributes reactive current and theoretically contributes reactive current.
8. The method for testing high/low voltage ride through of a grid-connected new energy station according to claim 3 or 7, wherein the specific process of S2 is as follows:
the high/low voltage ride through test system of the grid-connected new energy station reads real-time data from the wide area measurement system;
calculating a high/low voltage ride through test performance evaluation index including at least one of: the method comprises the steps that the actual non-offline time of the continuous operation of a computer unit is calculated in the duration time from the start to the end of high/low voltage ride through, the theoretical non-offline time of the continuous operation of the computer unit is calculated in the duration time from the start to the end of the high/low voltage ride through, if the actual non-offline time of the continuous operation of the computer unit is greater than or equal to the theoretical non-offline time of the continuous operation of the computer unit, the high/low voltage ride through action is judged to be correct, otherwise, the high/low voltage ride through action is judged to be incorrect; the actual reactive current increment of the unit contribution in the duration from the beginning to the end of the high/low voltage ride through is calculated, the theoretical reactive current increment of the unit contribution in the duration from the beginning to the end of the high/low voltage ride through is calculated, if the actual reactive current increment of the unit contribution is larger than or equal to the theoretical reactive current increment of the unit contribution, the high/low voltage ride through action is judged to be qualified, otherwise, the high/low voltage ride through action is judged to be unqualified;
and evaluating the high/low voltage ride through capability of the grid-connected new energy station by calculating and counting the correct action rate of the high/low voltage ride through of the unit and/or the qualification rate of the high/low voltage ride through of the unit.
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