[0052] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.
[0053] like figure 1 As shown, an automatic detection system of a new energy AGC or AVC control system includes an automatic test terminal, a master station simulation terminal, and a new energy power station simulation terminal;
[0054] The automatic test terminal is used for the production of test cases, data processing and comparison, generation of test reports, sending test cases to the simulation terminal of the main station, and delivering the preset initial state value of the equipment and remote adjustment and remote control to the simulation terminal of the new energy power station. Target parameters and target values to be detected, such as bus voltage, active power, etc.;
[0055] The simulation terminal of the master station is a TCP client based on IEC-104. After receiving the test case from the automatic test terminal, it sends the system under test (ie new energy AGC or AVC control system) to the system under test according to the simulation scheduling function set in the test case. Send the active or reactive target command specified in the test case; after the system under test is running, it will feed back the execution result to the master station simulation terminal, which is used to inform the master station simulation terminal that the system under test has received the command, and the master station simulation terminal sends the automatic test The terminal sends the feedback result to inform that the delivery is successful;
[0056] The new energy power station simulation terminal is a TCP server based on IEC-104, which is used to simulate and simulate different types of new energy power stations, such as photovoltaic power plants, wind power plants, etc. For example, the inverter, SVG (static var generator), high-voltage equipment and other equipment in the photovoltaic power station can be simulated, and the automatic test terminal informs the new energy power station simulation of the initial status information of the equipment in the power station set in the test case. Simultaneously, the system under test sends a remote control or remote adjustment command to the simulation terminal of the new energy power station after receiving the active or reactive power target command from the simulation terminal of the main station, and the simulation terminal of the new energy power station receives the remote control or remote adjustment command according to The initial state of itself and the specifications of the IEC-104 protocol are used to adjust its own state, and the adjusted state information is fed back to the system under test by telemetry or telemessage messages, and is fed back to the automatic test terminal, and the automatic test will adjust the results. Compare with the expected target value, if it is within the error range, the test item is considered qualified, otherwise it is unqualified. This test method realizes the closed-loop communication between the master station, the sub-station and the system under test through the pure software network environment, so as to realize the closed-loop simulation test of the system under test in the laboratory environment, and reduce the cost of building the test environment. Difficulty, cost and cycle, shorten the test time and improve the test efficiency.
[0057] To simulate and simulate a real new energy power station is to establish a communication point table for each new energy power station equipment. The content of the communication point table includes the parameter name, parameter code, parameter name of each device's remote adjustment, remote control, remote signaling and telemetry. The information body address, parameter value, parameter data type, parameter unit, minimum and maximum value of the parameter, the parameter content of the communication point table is clearly specified in the IEC-104 protocol, and the communication point table is stored in an XML format file The new energy power station simulation terminal can read and write the communication point table, and display the status information of the equipment in real time, which improves the readability and real-time data, and can simulate and simulate new energy power stations of different scales. It has strong flexibility and adaptability;
[0058] A test case is a file in XML format. The content of the file includes the items that need to be tested and the test data involved in each test item. The test data includes the command set issued by the automatic test terminal to the simulation terminal of the master and the automatic test terminal to the new energy source. All equipment at the power station simulation terminal set the initial state, target parameters and target values. These test items and data parameters are stored in the XML file in the specified format. The automatic test terminal can read and write the file and display it on the interface. For viewing and modification, if the test fails, it will not only fill in the unqualified test report, but also mark the name of the unqualified test item in red on the interface, so that the tester can know at a glance which test item has problems. It is convenient to troubleshoot problems and greatly shorten the time of trouble shooting;
[0059] A test report is a word document that records the items to be tested, the test steps, the result value of each test item, the target value, and the test result of passing or not. The target value is set in the test case automatically loaded before the program runs. value, and the result value is automatically filled in the report at the end of each test item in the actual operation, which realizes the automatic test and greatly saves the test time, and the report format can be customized according to different user manufacturers, and the test method is also It can be applied to the system under test of different manufacturers, which improves the utilization and flexibility of the test system;
[0060] The communication between the analog terminal of the master station and the system under test, as well as the system under test and the simulation terminal of the new energy power station, is through the IEC (International Electrotechnical Commission)-104 stipulation;
[0061] like figure 2 As shown, an automatic detection method for a new energy AGC or AVC control system includes the following steps:
[0062] (1) Model the equipment models in the new energy power station, such as the inverter, SVG, high-voltage equipment and other equipment models in the photovoltaic power station, that is, create a communication point table for each device, and use the simulation terminal of the new energy power station. On the interface, enter the parameter name, parameter code ID, parameter information body address, parameter value, parameter data type, parameter unit, parameter minimum and maximum value of each device for remote adjustment, remote control, remote signaling and telemetry. The simulation terminal of the energy power station supports the simulation of up to 255 devices. Compared with the traditional RTDS simulation system, the simulation system can simulate dozens of units at most, which greatly increases the number of power station equipment that can be simulated;
[0063] For example, if a photovoltaic power plant includes 100 inverters and 2 SVGs, the communication point table and communication parameters of 100 inverters and 2 SVGs need to be entered in the simulation terminal of the new energy power station, that is, based on the IEC-104 protocol The IP address and port number of the communication. The following takes the SVG communication point table as an example to show the relevant parameters. Table 1 shows the telemetry parameters in the SVG communication point table, and Table 2 shows the telemetry parameters in the SVG communication point table. Refers to the parameter encoding to ensure the uniqueness of the parameters, and the entry number refers to the address of the information body specified in the IEC-104 statute;
[0064] Table 1 shows the remote adjustment parameters in the SVG communication point table
[0065]
[0066]
[0067] Table 2 shows the telemetry parameters in the SVG communication point table
[0068] Numbering
[0069] Make a test case for the analog terminal of the master station, which is used for the master station analog terminal to issue active and reactive power target commands to the system under test. For example, the total active power target value is set to 5MW, and the total reactive power target command is set to adjust the bus voltage to 230KV; make a test case for the simulation end of the new energy power station, set the initial state value of the parameters of the inverter, SVG, high-voltage equipment and other equipment in the new energy power station, and set the target parameter to fill in the target value, such as 100 inverters in the photovoltaic power station Input the initial state of the inverter and two SVGs, for example, the initial active value and initial reactive value of each inverter are set to 0, the initial reactive value of SVG is also set to 0, and the target value of the test item is set at the same time. The active power target value of the first active power adjustment test item of each device is set to 0.05MW, and the reactive power target value of the first reactive power adjustment test item of each device is set to 0.05MVar;
[0070] Build a test environment, connect the PC where the automatic test terminal, the master station simulation terminal, and the new energy power station simulation terminal are located and the PC where the system under test is located to the same switch, and configure the IEC-104 communication parameters to establish a communication connection. This construction period, including the production of test cases and test reports, only takes one engineer 3 hours. Compared with the construction period of the traditional RTDS simulation system, the construction period has been greatly improved, the environment construction period has been greatly shortened, and the construction period has been greatly reduced. cost;
[0071] (2) Click the start test button on the automatic test end, automatically load the test case, start the test, realize one-click operation, improve the user's experience, the master station simulation end passes the com (component object model) interface according to the automatic test end The notified target value information sends the target value of active or reactive power to the system under test. If the total active power value specified in the test case is 5MW, the analog terminal of the master station sends the total active power to the system under test through the IEC-104 protocol message. The target value is 5MW. If the target bus voltage is adjusted to 230KV as specified in the test case, the master station analog terminal sends the target bus voltage target value to 230KV to the system under test;
[0072] (3) The system under test receives an instruction to issue remote adjustment or remote control commands to all the devices at the simulation end of the new energy power station. For example, when the system under test receives the command that the total active power target value needs to be adjusted to 5MW, the The active power target value allocated by the strategy to each inverter should be 0.05MW. When the system under test receives the reactive power command voltage target value of 230KV, it will calculate the reactive power according to the current voltage target value of 225KV and the upper and lower limits of the random impedance coefficient. The target value is calculated as follows:
[0073] Original bus voltage target value: U0=225KV;
[0074] Expected bus voltage target value: U1=230KV;
[0075] Target voltage difference: ΔU=U1-U0=5KV;
[0076] The system impedance coefficient is R;
[0077] Upper limit of random impedance coefficient: R1;
[0078] Lower limit of random impedance coefficient: R0;
[0079] Reactive power difference ΔQ=ΔU*R;
[0080] The system impedance coefficient R is obtained through the upper and lower limits of the random impedance coefficient:
[0081] random scale coefficient rate;
[0082] rate=random number% 20000/20000.0
[0083] R=R0+(R1-R0)*rate;
[0084] Assuming that the calculation result of R is 10, then the reactive power difference value ΔQ=ΔU*R=50MVar (megavar), and the initial reactive power target value is 0, then the expected reactive power target value Q1=0+ΔQ=50MVar , according to the strategy of equal margin allocation, the reactive power target value allocated to each inverter should be Q1/100=0.05MVar;
[0085]In the photovoltaic power station, due to various uncertain factors such as the power station load rate, the actual system impedance value will also be affected and show a fluctuating trend. Simulation of unstable factors, so that more realistic test data and test results can be obtained;
[0086] (4) The simulation terminal of the new energy power station adjusts the value of each equipment corresponding to the parameters that need to be adjusted according to the instructions according to the received remote control and remote adjustment instructions and the initial state set by the automatic test terminal for all equipment, such as the inverter's Active power value, and the results are fed back to the system under test through remote signaling and telemetry messages. At the same time, the state information of all devices after adjustment is notified to the automatic test terminal through the com interface. The remote adjustment command adjusts its own active power value to 0.05MW specified in the remote adjustment command, and informs each inverter of the actual adjusted value through the telemetry message, and also updates the active power value in the respective communication point table in real time. Inform the automatic test terminal of the actual active power value. In addition, reactive power adjustment: 100 inverters adjust their reactive power value to 0.05MVar specified in the remote adjustment command according to the received remote adjustment command, and inform each inverter through telemetry messages. The actual adjusted value of each inverter will also update the reactive power value in the respective communication point table in real time, and inform the automatic test terminal of the actual reactive power value;
[0087] (5) The automatic test terminal receives the result data fed back by the simulation terminal of the new energy power station, writes it into the result value item of the test report, and performs error calculation with the target value. If the test is within the error range, the test is qualified, and the test result is filled in " Qualified”, otherwise fill in “Unqualified”, and the report can be saved locally for testers to refer to. Therefore, the testing process of the new energy AGC/AVC control system can be greatly simplified, the testing time can be shortened, the testing efficiency can be improved, and it has strong practical value.
[0088] The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.
