Performance test method for adjustable load participating in primary frequency regulation

Abstract

This application provides a performance testing method for adjustable loads participating in primary frequency regulation. The method includes: determining the test parameter range of the power grid for adjustable loads participating in primary frequency regulation, wherein the test parameter range is a range characterizing frequency-related parameters in the power grid; performing static tests according to the test parameter range to obtain static test results, and determining the static performance of the adjustable load participating in primary frequency regulation based on the static test results; performing step response tests and ramp response tests according to the test parameter range to obtain dynamic test results, calculating dynamic performance indicators based on the dynamic test results, and determining the dynamic performance of the adjustable load participating in primary frequency regulation based on the dynamic performance indicators. This application solves the problem of the lack of performance testing for adjustable loads participating in primary frequency regulation in the prior art.

Description

Technical Field

[0001] This application relates to the field of power system performance testing technology, and more specifically, to a performance testing method for adjustable loads participating in primary frequency regulation. Background Technology

[0002] Regulated loads are loads that can be adjusted to maintain the supply and demand balance of the power system. As the capabilities of regulated loads in primary frequency regulation are continuously explored, the scenarios in which regulated loads participate in primary frequency regulation are increasing. Therefore, the impact of regulated loads on the primary frequency regulation of the power grid is becoming increasingly significant. In existing technologies, performance experiments are typically conducted on the process of regulated loads participating in primary frequency regulation, such as static and dynamic tests. However, existing test procedures and indicators suffer from a lack of unified standards, poor real-time performance, insufficient test accuracy, and incomplete test scope. Furthermore, most existing technologies are designed for hydroelectric and nuclear power units, lacking standardized test methods for regulated loads.

[0003] Therefore, a performance testing method for adjusting loads participating in primary frequency regulation is needed. Summary of the Invention

[0004] The main objective of this application is to provide a performance test method for adjustable loads participating in primary frequency regulation, so as to at least solve the problem of the lack of a performance test method for adjustable loads participating in primary frequency regulation in the prior art.

[0005] To achieve the above objectives, according to one aspect of this application, a performance testing method for adjustable loads participating in primary frequency regulation is provided, comprising: determining a test parameter range for the power grid in which the adjustable loads participate in primary frequency regulation, wherein the test parameter range is a range characterizing frequency-related parameters in the power grid; performing static testing according to the test parameter range to obtain static test results, and determining the static performance of the adjustable loads participating in the primary frequency regulation based on the static test results; performing step response testing and ramp response testing according to the test parameter range to obtain dynamic test results, calculating dynamic performance indicators based on the dynamic test results, and determining the dynamic performance of the adjustable loads participating in the primary frequency regulation based on the dynamic performance indicators.

[0006] Optionally, static testing is performed according to the test parameter range to obtain static test results, including: recording the sampling period, measurement resolution, and sampling delay time collected by the frequency measurement unit when the power grid frequency changes; recording the issuance time of the power control command of the adjustable load and the output time of the target control power when the power grid frequency changes, and calculating the difference between the output time and the issuance time to obtain the primary frequency regulation dead zone, wherein the power control command is used to output the target control power of the adjustable load; setting the frequency change deviation of the power grid to be greater than the standard frequency regulation dead zone, and recording the droop rate when the frequency change deviation is greater than the standard frequency regulation dead zone; when the primary frequency regulation has a limit, obtaining the first frequency regulation limit value of the adjustable load corresponding to the high load condition and the second frequency regulation limit value of the adjustable load corresponding to the low load condition; and obtaining the third frequency regulation limit value of the adjustable load corresponding to the preset rated active power condition when the power grid is under a preset rated active power condition.

[0007] Optionally, determining the static performance of the adjustable load participating in primary frequency regulation based on the static test results includes: comparing the static test results with the corresponding error allowable range; and determining that the static performance of the primary frequency regulation is normal if the static test results are within the error allowable range.

[0008] Optionally, a step response test is performed according to the test parameter range to obtain dynamic test results, including: connecting the communication interface of the adjustable load, acquiring the format of the data packet, and verifying whether the format of the data packet is a predetermined format; when the format of the data packet is a predetermined format, collecting voltage data and current data; setting a frequency dead zone, and generating an increasing step signal and a decreasing step signal through a standard frequency signal source, and testing the first step response result corresponding to the increasing step signal and the second step response result corresponding to the decreasing step signal, respectively.

[0009] Optionally, the process of performing a ramp response test based on the range of test parameters to obtain dynamic test results further includes: setting multiple steady-state frequencies and ramp rates corresponding to each steady-state frequency to obtain multiple combinations of the steady-state frequencies and ramp rates; and testing the ramp response of each combination of the steady-state frequencies and ramp rates for a predetermined duration to obtain ramp response test results.

[0010] Optionally, the dynamic performance index is calculated based on the dynamic test results, including: calculating the difference between the issuance time of the power control command of the adjustable load and the output time of the target control power to obtain the primary frequency dead zone; calculating the frequency response interval in the step response test and the ramp response test; calculating the deviation between the maximum response value and the minimum response value to obtain the maximum response deviation, wherein the maximum response value is the maximum value of the step response or the ramp response test, and the minimum response value is the minimum value of the step response or the ramp response; calculating the integral of the response quantity with respect to time to obtain the response integral quantity, wherein the response quantity is the step response quantity or the ramp response quantity.

[0011] Optionally, calculating the dynamic performance index based on the dynamic test results further includes: calculating the difference between the issuance time of the power control command and the time when the power change first reaches a first predetermined percentage of the target control power to obtain the start-up time; calculating the difference between the issuance time of the power control command and the time when the power change first reaches a second predetermined percentage of the target control power to obtain the response time, wherein the first predetermined percentage is less than the second predetermined percentage; and calculating the difference between the issuance time of the power control command and the time when the power change first reaches the target control power to obtain the adjustment time.

[0012] Optionally, the method further includes: setting the voltage fluctuation of the power grid while keeping the frequency constant, and testing whether the power grid has a low voltage ride-through fault or a high voltage ride-through fault; setting the voltage fluctuation of the power grid while changing the frequency, and testing whether the power grid has a low voltage ride-through fault or a high voltage ride-through fault.

[0013] Optionally, the method further includes: after a predetermined interval, repeating the static test, the step response test, and the ramp response test under high load and low load conditions.

[0014] Optionally, determining the test parameter range for the adjustable load participating in primary frequency regulation includes: determining the primary frequency regulation dead zone range; determining the under-response frequency range and over-response frequency range of the primary frequency regulation; and determining the time interval for issuing frequency regulation control commands between every two adjacent primary frequency regulation commands, wherein the frequency regulation control command is a command used to control the adjustable load to perform primary frequency regulation.

[0015] By applying the technical solution of this application, the test parameter range of a power grid in which adjustable loads participate in primary frequency regulation is determined. The test parameter range is defined as the range of frequency-related parameters in the power grid. Static tests are performed according to the test parameter range to obtain static test results, and the static performance of the adjustable load participating in primary frequency regulation is determined based on these results. Step response tests and ramp response tests are performed according to the test parameter range to obtain dynamic test results. Dynamic performance indicators are calculated based on these dynamic test results, and the dynamic performance of the adjustable load participating in primary frequency regulation is determined based on these dynamic performance indicators. Compared with the prior art, which lacks a performance test method for adjustable loads participating in primary frequency regulation, this application can obtain test results through static and dynamic performance tests, and evaluate the performance based on these results. It can comprehensively and intuitively test the primary frequency regulation performance of adjustable loads while meeting the requirements of high-precision and repeatable operation testing. Therefore, it can solve the problem of the lack of a performance test method for adjustable loads participating in primary frequency regulation in the prior art, achieving the effect of testing the performance of primary frequency regulation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A schematic flowchart of a performance test method for an adjustable load participating in primary frequency regulation, provided by an embodiment of this application, is shown.

[0018] Figure 2 The diagram illustrates a specific performance test method for adjustable loads participating in primary frequency regulation, as provided in an embodiment of this application. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0023] Adjustable load: A load whose output power can be varied according to the needs of the power system;

[0024] Primary frequency regulation is an automatic control process in a power system. When the frequency of the power grid deviates from the rated value, the control system of the generating units in the power grid will automatically adjust the active power of the generating units to limit the change in the power grid frequency, thereby maintaining the stability of the power grid frequency.

[0025] As described in the background section, the prior art lacks a performance test method for adjustable loads participating in primary frequency regulation. To address the lack of a performance test method for adjustable loads participating in primary frequency regulation, embodiments of this application provide a performance test method for adjustable loads participating in primary frequency regulation.

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] This embodiment provides a performance test method for an adjustable load operating on a mobile terminal, computer terminal, or similar computing device participating in primary frequency modulation. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0028] Figure 1 This is a flowchart of a performance test method for adjustable loads participating in primary frequency regulation according to an embodiment of this application.

[0029] like Figure 1 As shown, the method includes the following steps:

[0030] Step S201: Determine the test parameter range for the power grid in which adjustable loads participate in primary frequency regulation, wherein the test parameter range is the range of frequency-related parameters characterizing the power grid.

[0031] Specifically, before conducting the test, it is necessary to determine the test methods, test requirements, and test items. The test methods include: for individual adjustable loads under adjustable load aggregation conditions, remote full-scale testing and single-sample testing are recommended, with the sampling ratio determined by the dispatching agency based on the grid conditions. For adjustable load equipment of the same type, one test point can be selected for testing, and the test results can be applied to other adjustable load equipment. Test requirements include: the test condition should be selected when the operating power of the adjustable load is greater than 80% PN (rated power). For conditions with specific requirements of 100% rated active power, a primary frequency regulation test under 100% rated active power conditions should be conducted. On-site test instruments and equipment should meet the needs of high-frequency data acquisition and waveform recording, with a data acquisition interval of less than or equal to 20ms. Test items include: static testing and dynamic testing. It also includes determining the test parameter range, which includes the frequency dead zone range, under-frequency response frequency range, over-frequency response frequency range, and command issuance interval. In practice, the test methods, test requirements, test items, and test parameter ranges can be selected according to the actual grid conditions.

[0032] Step S202: Perform static testing according to the above test parameter range, obtain static test results, and determine the static performance of the adjustable load participating in the primary frequency regulation based on the above static test results;

[0033] Specifically, after determining the range of test parameters, static testing is carried out first. That is, by setting static parameters, it is tested whether the parameters in the primary frequency modulation process are within the allowable error range. Static testing includes data acquisition test of adjustable load frequency measurement unit, primary frequency modulation dead zone test, droop rate test and frequency modulation limiting test.

[0034] Step S203: Perform step response test and ramp response test according to the above test parameter range to obtain dynamic test results. Calculate dynamic performance index based on the dynamic test results and determine the dynamic performance of the adjustable load participating in the primary frequency regulation based on the dynamic performance index.

[0035] Specifically, dynamic testing involves testing the dynamic response process during a single frequency modulation procedure. Dynamic testing includes step response testing and ramp response testing. Data from the dynamic testing process is recorded and analyzed to calculate dynamic performance indicators, such as dynamic response time, and other relevant parameters.

[0036] This embodiment determines the test parameter range for a power grid with adjustable loads participating in primary frequency regulation. The test parameter range is defined as the range of frequency-related parameters in the power grid. Static tests are performed based on the test parameter range to obtain static test results, and the static performance of the adjustable load participating in primary frequency regulation is determined based on these results. Step response and ramp response tests are performed based on the test parameter range to obtain dynamic test results. Dynamic performance indicators are calculated based on these dynamic test results, and the dynamic performance of the adjustable load participating in primary frequency regulation is determined based on these dynamic performance indicators. Compared to existing technologies that lack performance testing methods for adjustable loads participating in primary frequency regulation, this application can obtain test results through static and dynamic performance tests, and evaluate the performance based on these results. This allows for a comprehensive and intuitive test of the primary frequency regulation performance of adjustable loads while meeting the requirements of high-precision and repeatable operational testing. Therefore, it solves the problem of the lack of performance testing methods for adjustable loads participating in primary frequency regulation in existing technologies, achieving the effect of testing the performance of primary frequency regulation.

[0037] In the specific implementation process, step S202 above performs static testing according to the above test parameter range to obtain static test results, which can be achieved through the following steps: When the frequency of the above power grid changes, record the sampling period, measurement resolution, and sampling delay time collected by the frequency measurement unit, wherein the above measurement resolution is the resolution measured by the above frequency measurement unit; When the frequency of the above power grid changes, record the issuance time of the power control command of the adjustable load and the output time of the target control power, and calculate the difference between the output time and the issuance time to obtain the primary frequency regulation dead zone, wherein the above power control command is used to output the target control power of the adjustable load; Set the frequency change deviation of the above power grid to be greater than the standard frequency regulation dead zone, and record the droop rate when the frequency change deviation is greater than the standard frequency regulation dead zone; When the above primary frequency regulation has a limit, respectively obtain the first frequency regulation limit value of the adjustable load corresponding to the high load condition and the second frequency regulation limit value of the adjustable load corresponding to the low load condition; When the above power grid is under the preset rated active power condition, obtain the third frequency regulation limit value corresponding to the adjustable load under the preset rated active power condition. This method performs static testing through the above steps, which can accurately determine the static performance of adjustable loads participating in primary frequency regulation.

[0038] Specifically, static tests include: 1) Frequency measurement unit data acquisition test: By continuously changing the simulated power grid frequency signal, i.e., under the condition of changing power grid frequency, the sampling period, measurement resolution, and acquisition delay time of the frequency measurement unit are tested and recorded. The frequency measurement unit collects voltage and current signal data, and the frequency data is calculated from the above voltage and current sampling data. 2) Primary frequency regulation dead zone test: The primary frequency regulation dead zone is tested by continuously changing the simulated power grid frequency signal. That is, under the condition of changing power grid frequency, the time when the power control command of the adjustable load is issued is recorded, and the time when the power control command starts to output the target control power is recorded. The difference between the two times is the primary frequency regulation dead zone. 3) Dragging rate test: Given a simulated power grid frequency signal, and with the frequency change deviation outside the primary frequency regulation control dead zone, i.e., the frequency change deviation is greater than the standard frequency regulation dead zone, the time when the power control command of the adjustable load is issued is recorded, and the drogging rate is verified. 4) Frequency Regulation Limiting Test: For power grids with primary frequency regulation limits, the primary frequency regulation limit value (first frequency regulation limit value) under high load conditions and the primary frequency regulation limit value (second frequency regulation limit value) under low load conditions should be tested separately. The preset rated active power condition usually refers to the 100% rated active power condition. If there are specific requirements for the 100% rated active power condition, a primary frequency regulation limit value test should be conducted under the 100% rated active power condition to obtain the corresponding third frequency regulation limit value. Since the power system frequency is the same value, the frequency measurement unit can be installed at any location, but it is usually installed at the grid connection point of the adjustable load.

[0039] In some optional implementations, step S202, which determines the static performance of the adjustable load participating in primary frequency regulation based on the static test results, can be achieved through the following steps: comparing the static test results with the corresponding allowable error range; if the static test results are within the allowable error range, determining that the static performance of the primary frequency regulation is normal. This method determines that the static performance of the adjustable load participating in primary frequency regulation is normal through the above steps, thus accurately determining the static performance.

[0040] In practice, the test results obtained in the above static testing steps are collectively referred to as static test results, including sampling period, measurement resolution, sampling delay time, primary frequency modulation dead zone, modulation rate, and various frequency modulation limits. If all the above static test results are within the allowable error range, the static performance of the primary frequency modulation is determined to be normal. The allowable error range can be determined based on the values ​​submitted by the applicant.

[0041] To conduct dynamic testing, step S203 above performs a step response test according to the aforementioned test parameter range to obtain dynamic test results. This can be achieved through the following steps: connecting the communication interface of the adjustable load, acquiring the format of the data message, and verifying whether the data message format is a predetermined format; if the data message format is a predetermined format, acquiring voltage and current data; setting a frequency dead zone, and generating an increasing step signal and a decreasing step signal using a standard frequency signal source, respectively testing the first step response result under the increasing step signal and the second step response result under the decreasing step signal. This method performs step response testing through the above steps, thus testing the dynamic performance of the adjustable load participating in primary frequency regulation.

[0042] Specifically, dynamic testing is divided into step response testing and ramp response testing. The steps of step response testing are as follows: a) First, check the wiring. After confirming that the wiring is correct, connect the communication interface of the adjustable load and verify the accuracy of the communication data message format, including data reporting, power control, etc. The accuracy of the message format can be determined by verifying whether the above data is in the predetermined format. b) If the data message format is in the predetermined format, the primary frequency modulation test device collects voltage and current data, records the voltage and current data, and verifies the data density and correctness. c) Set the frequency dead zone. d) Generate a set of downward frequency step signals, i.e., decreasing step signals (-0.03Hz, -0.05Hz, -0.1Hz, -0.2Hz, -0.25Hz, -0.4Hz, -0.45Hz, each with a duration of 10s), using a standard frequency signal source, and test the response results under different frequency signals. e) Generate a set of upward frequency step signals, i.e., incremental step signals (0.03Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.25Hz, 0.4Hz, 0.45Hz, each with a duration of 10s) using a standard frequency signal source, and test the response results under different frequency signals.

[0043] In some optional implementations, the ramp response test is performed according to the above-mentioned test parameter range to obtain dynamic test results. This further includes: setting multiple steady-state frequencies and corresponding ramp rates for each steady-state frequency to obtain multiple combinations of the steady-state frequencies and ramp rates; and testing the ramp response of each combination of steady-state frequencies and ramp rates for a predetermined duration to obtain ramp response test results. This method performs ramp response testing through the above steps, thus testing whether the ramp response function of the power grid is normal.

[0044] In the specific implementation, six combinations of steady-state frequencies and the aforementioned ramp rates were set, with a predetermined duration of 5 seconds. These combinations are: a) steady-state frequency 49.95Hz, ramp rate 0.01Hz / s, duration 5 seconds; b) steady-state frequency 50.00Hz, ramp rate 0.02Hz / s, duration 5 seconds; c) steady-state frequency 50.10Hz, ramp rate 0.05Hz / s, duration 5 seconds; d) steady-state frequency 50.35Hz, ramp rate -0.05Hz / s, duration 5 seconds; e) steady-state frequency 50.10Hz, ramp rate -0.02Hz / s, duration 5 seconds; f) steady-state frequency 50.00Hz, ramp rate -0.01Hz / s, duration 5 seconds. The ramp response for each of the above steady-state frequencies and ramp rates was tested, and the ramp response test results were obtained.

[0045] In some optional implementations, the dynamic performance index is calculated based on the above dynamic test results through the following steps: calculating the difference between the issuance time of the power control command of the adjustable load and the output time of the target control power to obtain the primary frequency regulation dead zone; calculating the frequency response interval in the above step response test and the above ramp response test; calculating the deviation between the maximum and minimum response values ​​to obtain the maximum response deviation, wherein the above maximum response value is the maximum value of the step response or the above ramp response test, and the above minimum response value is the minimum value of the above step response or the above ramp response; calculating the integral of the response quantity with respect to time to obtain the response integral quantity, wherein the above response quantity is the step response quantity or the ramp response quantity. This method calculates the dynamic performance index through the above steps, thus determining the dynamic performance of the adjustable load participating in primary frequency regulation.

[0046] Specifically, the frequency modulation dead zone is the interval during which no action is taken. It is calculated by the difference between the time when the power control command of the adjustable load is issued and the time when the target control power is output. If the action is within the range of the primary frequency modulation dead zone, it indicates that there is no problem with the primary frequency modulation dead zone. The frequency response range is the interval during which no action is taken, including the frequency response range in step response test and ramp response test. The maximum response deviation is the maximum deviation during the response process, which is the difference between the maximum and minimum response values. The primary frequency modulation response integral is the integral of the response quantity over time.

[0047] In some optional implementations, calculating the dynamic performance indicators based on the above dynamic test results further includes: calculating the difference between the issuance time of the power control command and the time when the power change first reaches a first predetermined percentage of the target control power to obtain the start-up time; calculating the difference between the issuance time of the power control command and the time when the power change first reaches a second predetermined percentage of the target control power to obtain the response time, wherein the first predetermined percentage is less than the second predetermined percentage; and calculating the difference between the issuance time of the power control command and the time when the power change first reaches the target control power to obtain the adjustment time. This method calculates the start-up time, response time, and adjustment time of the adjustable load participating in a primary frequency regulation process through the above steps, thus enabling testing of the time response performance of the primary frequency regulation process.

[0048] In the specific implementation process, the start-up time (s) is the time from receiving the control signal until the power change first reaches the first predetermined percentage of the target control power, which is set to 10%; the response time (s) is the time from receiving the control signal until the power change first reaches the second predetermined percentage of the target control power, which is set to 90%; and the adjustment time (s) is the time from receiving the control signal until the power reaches the target control power and the power deviation is always controlled within ±2% at the start moment.

[0049] To test the anti-disturbance performance during a frequency regulation process, the above method further includes the following steps: setting voltage fluctuations in the power grid while keeping the frequency constant, and testing whether the power grid has low-voltage ride-through faults or high-voltage ride-through faults; setting voltage fluctuations in the power grid while changing the frequency, and testing whether the power grid has low-voltage ride-through faults or high-voltage ride-through faults. This method performs anti-disturbance tests through the above steps, thus verifying the anti-disturbance performance.

[0050] In the specific implementation process, the disturbance prevention function of the adjustable load during high and low voltage ride-through transients is tested. The test contents are as follows: 1) Voltage fluctuation, frequency unchanged, test whether the primary frequency regulation function operates normally. 2) Voltage fluctuation, frequency change, test whether the primary frequency regulation function operates normally. Low voltage ride-through faults and high voltage ride-through faults may occur. The corresponding test contents and frequency change waveforms are shown in Table 1.

[0051] Table 1

[0052]

[0053] In some optional implementations, the method further includes the following steps: after a predetermined interval, under both high-load and low-load conditions, repeating the static test, the step response test, and the ramp response test. This method performs verification tests through these steps, thus repeatedly verifying the performance of adjustable loads participating in primary frequency regulation to ensure the normal operation of the power grid.

[0054] In practice, adjustable loads should undergo periodic frequency regulation verification tests. Verification can be performed at predetermined intervals, with a verification cycle not exceeding two years. A test report should be provided to the power dispatching agency upon completion of the verification test. After modifications, overhauls, software upgrades, or changes to logic or parameters affecting the primary frequency regulation performance of adjustable loads, a new primary frequency regulation test should be conducted, and a test report should be provided to the power dispatching agency. Test items include the aforementioned static and dynamic test items: primary frequency regulation dead zone test, amplitude limiting test, step response test, and ramp response test. The test includes two operating conditions: low load and high load.

[0055] To accurately determine the range of test parameters, step S201 above determines the range of test parameters for the adjustable load participating in primary frequency regulation. This can be achieved through the following steps: determining the primary frequency regulation dead zone range; determining the under-response frequency range and over-response frequency range of the primary frequency regulation; and determining the time interval between the issuance of frequency regulation control commands for every two adjacent primary frequency regulation commands, wherein the frequency regulation control commands are commands used to control the adjustable load to perform primary frequency regulation. This method determines the range of test parameters through the above steps, thus allowing the test to be conducted within the specified range and ensuring favorable test conditions.

[0056] Specifically, the frequency modulation dead zone range should be set to [49.95, 50.05] Hz. The underresponse frequency range should be set to [49.95-49.80] Hz. The overresponse frequency range should be set to [50.05-50.20] Hz. The interval between adjacent frequency modulation control commands should be set to 15 seconds.

[0057] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the performance test method for adjustable load participating in primary frequency regulation will be described in detail below with reference to specific embodiments.

[0058] This embodiment relates to a specific performance test method for adjustable loads participating in primary frequency regulation, such as... Figure 2 As shown, it includes the following steps:

[0059] Step S1: Determine the test methods and requirements: For individual adjustable loads under adjustable load aggregation conditions, remote full-scale testing and individual sampling testing should be used. The sampling ratio is determined by the dispatching agency based on the grid conditions. For adjustable load equipment of the same type, one test point can be selected for testing, and the test results can be applied to other adjustable load equipment. Test requirements include: the test condition should be selected when the operating power of the adjustable load is greater than 80% PN (rated power). For conditions with specific requirements of 100% rated active power, a primary frequency regulation test under 100% rated active power conditions should be conducted. On-site test instruments and equipment should meet the requirements for high-frequency data acquisition and waveform recording, and the data acquisition interval should be less than or equal to 20ms. Test items include static testing and dynamic testing.

[0060] Step S2: Determine the test parameter range: 1) The frequency dead zone should be set to [49.95, 50.05] Hz; 2) The underfrequency response frequency range should be set to [49.95-49.80] Hz; 3) The overfrequency response frequency range should be set to [50.05-50.20] Hz; 4) The interval between adjacent frequency modulation control commands should be set to 15 seconds.

[0061] Step S3: Static Testing: 1) Frequency Measurement Unit Data Acquisition Test: By continuously changing the simulated power grid frequency signal, i.e., under the condition of changing power grid frequency, test and record the sampling period, measurement resolution, and acquisition delay time of the frequency measurement unit. 2) Primary Frequency Regulation Dead Zone Test: By continuously changing the simulated power grid frequency signal, test the primary frequency regulation dead zone. That is, under the condition of changing power grid frequency, record the time when the power control command of the adjustable load is issued, and the time when the power control command starts to output the target control power. The difference between the two times is the primary frequency regulation dead zone. 3) Dragging Rate Test: Given a simulated power grid frequency signal, and with the frequency change deviation outside the primary frequency regulation control dead zone, i.e., the frequency change deviation is greater than the standard frequency regulation dead zone, record the time when the power control command of the adjustable load is issued, and verify the drogging rate. 4) Frequency Regulation Limiting Test: For power grids with primary frequency regulation limiting, the primary frequency regulation limiting value under high load conditions (i.e., the first frequency regulation limiting value) and the primary frequency regulation limiting value under low load conditions (i.e., the second frequency regulation limiting value) should be tested separately. The preset rated active power condition usually refers to the 100% rated active power condition. If there are specific requirements for the 100% rated active power condition, a first frequency modulation limit test should be carried out under the 100% rated active power condition to obtain the third frequency modulation limit corresponding to the 100% rated active power condition.

[0062] Step S4: Dynamic Testing: The steps for the step response test are as follows: a) First, check the wiring. After confirming that the wiring is correct, connect the communication interface of the adjustable load and verify the accuracy of the communication data message format, including data reporting, power control, etc. The accuracy of the message format can be determined by verifying that the above data is in the predetermined format. b) If the data message format is in the predetermined format, the primary frequency modulation test device collects voltage and current data, records the voltage and current data, and verifies the data density and correctness. c) Set the frequency dead zone. d) Generate a set of downward frequency step signals (-0.03Hz, -0.05Hz, -0.1Hz, -0.2Hz, -0.25Hz, -0.4Hz, -0.45Hz, each lasting 10s) using a standard frequency signal source, and test the response results under different frequency signals. e) Generate a set of upward frequency step signals (0.03Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.25Hz, 0.4Hz, 0.45Hz, each lasting 10s) using a standard frequency signal source, and test the response results under different frequency signals. The ramp response test steps are as follows: Set six combinations of steady-state frequencies and the above ramp rates, and set a predetermined duration of 5s. These are: a) Steady-state frequency 49.95Hz, ramp rate 0.01Hz / s, lasting 5s; b) Steady-state frequency 50.00Hz, ramp rate 0.02Hz / s, lasting 5s; c) Steady-state frequency 50.10Hz, ramp rate 0.05Hz / s, lasting 5s; d) Steady-state frequency 50.35Hz, ramp rate -0.05Hz / s, lasting 5s; e) Steady-state frequency 50.10Hz, ramp rate -0.02Hz / s, lasting 5s. f) Steady-state frequency 50.00Hz, ramp rate -0.01Hz / s, duration 5s. Test the ramp response for each of the above steady-state frequencies and ramp rates, and obtain the ramp response test results;

[0063] Step S5: Dynamic performance index calculation: Calculate the difference between the issuance time of the power control command of the adjustable load and the output time of the target control power to obtain the frequency dead zone; calculate the frequency response interval in the step response test and the ramp response test; calculate the deviation between the maximum and minimum response values ​​to obtain the maximum response deviation; calculate the integral of the response quantity with respect to time to obtain the response integral quantity, wherein the response quantity is a step response quantity or a ramp response quantity; calculate the difference between the issuance time of the power control command and the time when the power change first reaches a first predetermined percentage of the target control power to obtain the start-up time; calculate the difference between the issuance time of the power control command and the time when the power change first reaches a second predetermined percentage of the target control power to obtain the response time, wherein the first predetermined percentage is less than the second predetermined percentage; calculate the difference between the issuance time of the power control command and the time when the power change first reaches the target control power to obtain the adjustment time.

[0064] Step S6: Disturbance Prevention Test: Test the disturbance prevention function of the adjustable load during high and low voltage ride-through transients. The test contents are as follows: 1) Voltage fluctuation, frequency unchanged, test whether the primary frequency regulation function operates normally or whether a high and low voltage ride-through fault occurs. 2) Voltage fluctuation, frequency change, test whether the primary frequency regulation function operates normally or whether a high and low voltage ride-through fault occurs. The test and waveform changes are shown in Table 1 above;

[0065] Step S7: Periodic Testing: The test items include static and dynamic tests under both low and high load conditions: primary frequency regulation dead zone test, amplitude limiting test, step response test, and ramp response test. Adjustable loads should undergo periodic primary frequency regulation verification tests, with a verification cycle not exceeding two years. A test report should be provided to the power dispatching agency after the verification test is completed. For components affecting the primary frequency regulation performance of adjustable loads, after modifications such as upgrades, overhauls, software upgrades, or changes to logic or parameters, a new primary frequency regulation test should be conducted, and a test report should be provided to the power dispatching agency.

[0066] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0067] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0068] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0069] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0070] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0071] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0072] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0073] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0074] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0075] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0076] 1) The performance test method for adjustable loads participating in primary frequency regulation in this application determines the test parameter range of the power grid for adjustable loads participating in primary frequency regulation. The test parameter range is the range of frequency-related parameters in the power grid. Static tests are performed according to the test parameter range to obtain static test results, and the static performance of the adjustable load participating in primary frequency regulation is determined based on the static test results. Step response tests and ramp response tests are performed according to the test parameter range to obtain dynamic test results. Dynamic performance indicators are calculated based on the dynamic test results, and the dynamic performance of the adjustable load participating in primary frequency regulation is determined based on the dynamic performance indicators. Compared with the prior art, which lacks a performance test method for adjustable loads participating in primary frequency regulation, this application can obtain test results through static and dynamic performance tests, and evaluate the performance based on the test results. It can comprehensively and intuitively test the primary frequency regulation performance of adjustable loads while meeting the requirements of high-precision and repeatable operation tests. Therefore, it can solve the problem of the lack of a performance test method for adjustable loads participating in primary frequency regulation in the prior art, achieving the effect of testing the performance of primary frequency regulation.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A performance test method for adjustable loads participating in primary frequency regulation, characterized in that, include: Determine the range of test parameters for a power grid in which adjustable loads participate in primary frequency regulation, wherein the range of test parameters is the range of frequency-related parameters characterizing the power grid; Static tests are performed according to the test parameter range to obtain static test results, and the static performance of the adjustable load participating in the primary frequency regulation is determined based on the static test results. Step response and ramp response tests are performed according to the test parameter range to obtain dynamic test results. Dynamic performance indicators are calculated based on the dynamic test results, and the dynamic performance of the adjustable load participating in the primary frequency regulation is determined based on the dynamic performance indicators. Static testing is conducted according to the aforementioned test parameter range to obtain static test results, including: recording the sampling period, measurement resolution, and sampling delay time acquired by the frequency measurement unit when the power grid frequency changes; recording the issuance time of the power control command and the output time of the target control power of the adjustable load when the power grid frequency changes, and calculating the difference between the output time and the issuance time to obtain the primary frequency regulation dead zone, wherein the power control command is used to control the output of the target control power of the adjustable load; setting the frequency change deviation of the power grid to be greater than the standard frequency regulation dead zone, and recording the droop rate when the frequency change deviation is greater than the standard frequency regulation dead zone; obtaining the first frequency regulation limit value of the adjustable load under high load conditions and the second frequency regulation limit value of the adjustable load under low load conditions when the power grid is under a preset rated active power condition; obtaining the third frequency regulation limit value of the adjustable load under the preset rated active power condition when the power grid is under a preset rated active power condition. The step response test is performed according to the test parameter range to obtain dynamic test results, including: connecting the communication interface of the adjustable load, obtaining the format of the data message, and verifying whether the format of the data message is a predetermined format; when the format of the data message is a predetermined format, collecting voltage data and current data; setting the frequency dead zone, and generating an increasing step signal and a decreasing step signal through a standard frequency signal source, and testing the first step response result corresponding to the increasing step signal and the second step response result corresponding to the decreasing step signal, respectively.

2. The performance testing method according to claim 1, characterized in that, Determining the static performance of the adjustable load participating in primary frequency regulation based on the static test results includes: Compare the static test results with the corresponding allowable error range; If the static test results are within the allowable error range, the static performance of the primary frequency modulation is determined to be normal.

3. The performance testing method according to claim 1, characterized in that, The hill-climb response test is conducted according to the aforementioned test parameter range to obtain dynamic test results, and the test also includes: Multiple steady-state frequencies and corresponding ramp rates are set to obtain multiple combinations of steady-state frequencies and ramp rates. The ramp response of each combination of steady-state frequencies and ramp rates is tested for a predetermined duration to obtain ramp response test results.

4. The performance testing method according to claim 1, characterized in that, Dynamic performance indicators are calculated based on the dynamic test results, including: The difference between the issuance time of the power control command of the adjustable load and the output time of the target control power is calculated to obtain the primary frequency modulation dead zone; Calculate the frequency response range in the step response test and the ramp response test; The deviation between the maximum and minimum response values ​​is calculated to obtain the maximum response deviation, wherein the maximum response value is the maximum value of the step response or the ramp response test, and the minimum response value is the minimum value of the step response or the ramp response. The integral of the response over time is calculated to obtain the integral response, wherein the response is a step response or a ramp response.

5. The performance testing method according to claim 1, characterized in that, The calculation of dynamic performance indicators based on the dynamic test results also includes: The start-up time is obtained by calculating the difference between the time when the power control command is issued and the time when the power change first reaches the first predetermined percentage of the target control power. The response time is obtained by calculating the difference between the time when the power control command is issued and the time when the power change first reaches a second predetermined percentage of the target control power, wherein the first predetermined percentage is less than the second predetermined percentage; The adjustment time is obtained by calculating the difference between the time when the power control command is issued and the time when the power change first reaches the target control power.

6. The performance testing method according to claim 1, characterized in that, The method further includes: Set the voltage fluctuation of the power grid while keeping the frequency constant, and test whether the power grid has a low voltage ride-through fault or a high voltage ride-through fault; The voltage of the power grid is set to fluctuate and the frequency changes to test whether the power grid has a low voltage ride-through fault or a high voltage ride-through fault.

7. The performance testing method according to claim 1, characterized in that, The method further includes: After a predetermined interval, the static test, the step response test, and the ramp response test are repeated under high-load and low-load operating conditions.

8. The performance testing method according to claim 1, characterized in that, Determine the range of test parameters for adjustable loads participating in primary frequency regulation, including: Determine the dead zone range of the primary frequency modulation; Determine the underresponse frequency range and the overresponse frequency range of the primary frequency modulation; Determine the time interval for issuing frequency modulation control commands between any two adjacent primary frequency modulation commands, wherein the frequency modulation control command is a command used to control the adjustable load to perform primary frequency modulation.

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