Inertia response test method for network-forming type energy storage system

Abstract

The invention discloses a network construction type energy storage system inertia response test method, which is specifically implemented according to the following steps: step 1, before testing, quitting AGC and primary frequency modulation control functions of an energy storage power station; 2, setting parameters of a data recording analyzer and a frequency signal generating device; step 3, setting an operation recharging state of the energy storage system; 4, the frequency signal generation device sends a frequency change disturbance signal, and an inertia response test is carried out; 5, setting an operation re-discharge state of the energy storage system, and repeating the step 4; 6, the data recording analyzer collects data in real time; and 7, calculating and analyzing the inertia response of the energy storage system, and comprehensively evaluating the response performance of the networking type energy storage system. According to the invention, a frequency set value signal can be sent through the frequency signal device, the data recording analyzer collects signals such as voltage and current of an energy storage grid-connected point in real time, the inertia response performance is analyzed and calculated, and the inertia response performance of the energy storage system is accurately evaluated.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid detection methods, and in particular relates to an inertia response testing method for a grid-type energy storage system. Background Art

[0002] The total installed capacity of energy storage systems continues to rise, the energy storage penetration rate increases, and the relative capacity of synchronous generators that provide inertia and damping for the power system decreases, resulting in a gradual decrease in the system's rotational inertia. A grid-forming energy storage system can achieve active support for the grid inertia, improve the energy storage and grid-connectedness, and the safety and stability of the grid. Therefore, mastering the test method of a grid-forming energy storage system is a key technology in the field of grid status detection technology.

[0003] At present, the inertia response test methods of energy storage systems are mostly unified standards, and are concentrated on current source energy storage systems. The inertia response test method of current source energy storage systems monitors the grid frequency through the site fast frequency device, calculates the frequency change rate, and transmits instructions to the site energy management platform. The energy storage system again passively accepts the instructions issued by the energy management platform and executes them. However, the inertia response of the grid-forming energy storage system does not monitor the grid frequency through the site fast frequency device, but can autonomously sense the changes in the grid frequency. Therefore, the traditional current source energy storage system inertia response test method is no longer applicable to the inertia response test of the grid-forming energy storage system. Summary of the invention

[0004] The purpose of the present invention is to provide a method for testing the inertia response of a grid-type energy storage system, which can accurately evaluate the inertia response performance of the grid-type energy storage system.

[0005] The technical solution adopted by the present invention is a method for testing the inertia response of a grid-type energy storage system, which is specifically implemented according to the following steps:

[0006] Step 1: Before testing, exit the AGC and primary frequency control functions of the energy storage power station;

[0007] Step 2, setting parameters of the data recorder analyzer and the frequency signal generator;

[0008] Step 3, setting the energy storage system to operate and recharge;

[0009] Step 4: The frequency signal generating device sends a frequency change disturbance signal to perform an inertia response test;

[0010] Step 5, set the energy storage system to run and discharge state, and repeat step 4;

[0011] Step 6: The data recorder analyzer collects data in real time;

[0012] Step 7: Calculate and analyze the inertia response of the energy storage system, and comprehensively evaluate the response performance of the grid-type energy storage system.

[0013] The present invention is also characterized in that:

[0014] Step 2 is as follows: connect the frequency signal generator to the energy storage system and the data recorder and analyzer respectively, set the sampling frequency, PT / CT ratio, and grid connection point voltage amplitude of the data recorder and analyzer, and set the frequency setting value, frequency resolution, and frequency change rate of the frequency signal generator.

[0015] Step 6 is specifically as follows: the data recorder analyzer collects the voltage and current signals of the energy storage system grid connection point in real time, and then tests the response characteristics of the energy storage system under the condition of frequency change disturbance.

[0016] The charging and discharging power of the energy storage system is tested at several points and the critical points must be tested.

[0017] When conducting the inertia response test, the energy storage system should maintain stable operation, the energy storage system control function should be switched to manual control, the primary frequency regulation function should be exited, the energy storage system charge and discharge should not be less than 90% Pn, and the test data collected by the control system should cover the frequency fluctuation range and frequency change rate. The next test should be carried out after the station power regulation is stable.

[0018] When the frequency change rate and frequency deviation of the test point of the grid-type energy storage system exceed the threshold, the energy storage system should be able to respond to the frequency change of the system and provide inertia support; by testing and calculating and analyzing the response characteristics of the grid-type energy storage system under frequency change disturbances, the inertia response performance of the grid-type energy storage system is comprehensively evaluated.

[0019] The beneficial effects of the present invention are as follows: the inertia response test method of the grid-type energy storage system can send a frequency setting value signal through a frequency signal device, and a data recording and analyzing instrument can collect voltage and current signals of the energy storage grid connection point in real time, analyze and calculate the inertia response performance, accurately evaluate the inertia response performance of the energy storage system, and master the active inertia support capability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a wiring diagram of the field test of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] The inertia response test method of the grid-type energy storage system is implemented in the following steps:

[0024] Step 1: Before the test, after obtaining the consent of the power system dispatching agency, the energy storage system EMS local control and exit the primary frequency control function;

[0025] Step 2, setting parameters of the data recorder analyzer and the frequency signal generator;

[0026] Step 2 is specifically as follows: connect the frequency signal generator to the energy storage system and the data recorder and analyzer respectively, set the sampling frequency, PT / CT ratio, and grid connection point voltage amplitude of the data recorder and analyzer, and set the frequency setting value, frequency resolution, and frequency change rate of the frequency signal generator;

[0027] Step 3, setting the energy storage system to operate and recharge;

[0028] Set the energy storage system charging power to 25% PN ~ 50% PN and 65% P N ~90%P N Test within the scope;

[0029] Step 4: The frequency signal generating device sends a frequency change disturbance signal to perform an inertia response test;

[0030] Step 5, set the energy storage system to run and discharge state, and repeat step 4;

[0031] Set the energy storage system discharge power to 25% PN ~ 50% PN and 65% P N ~90%P N Test within the scope;

[0032] Step 6: The data recorder analyzer collects data in real time;

[0033] Step 6 is as follows: the data recorder analyzer collects the voltage and current signals of the energy storage system grid connection point in real time, and then tests the response characteristics of the energy storage system under the condition of frequency change disturbance (rise time, maximum active power regulation and steady-state deviation);

[0034] Step 7: Calculate and analyze the inertia response of the energy storage system, and comprehensively evaluate the response performance of the grid-type energy storage system;

[0035] The charging and discharging power of the energy storage system is tested at several points and the critical points must be tested;

[0036] When conducting the inertia response test, the energy storage system should maintain stable operation, the energy storage system control function should be switched to manual control, the primary frequency regulation function should be exited, the energy storage system charge and discharge should not be less than 90% Pn, and the test data collected by the control system should cover the frequency fluctuation range and frequency change rate. The next test should be carried out after the station power regulation is stable;

[0037] When the frequency change rate and frequency deviation of the test point of the grid-type energy storage system exceed the threshold, the energy storage system should be able to respond to the frequency change of the system and provide inertia support; by testing and calculating and analyzing the response characteristics of the grid-type energy storage system under frequency change disturbances, the inertia response performance of the grid-type energy storage system is comprehensively evaluated.

[0038] Example 2

[0039] Inertia response test of grid-type energy storage system:

[0040] The inertia response test content of the grid-type energy storage system should be completed in field tests under corresponding working conditions. The test conditions are as follows.

[0041] The inertia response test conditions of the grid-type energy storage system are:

[0042] (1) The charging output range of the grid-connected energy storage system is 25%P n -50% P n The energy storage EMS has power limit in condition 1 and no power limit in condition 2.

[0043] (2) The charging interval of the grid-connected energy storage system is 65%P n -90%P n The energy storage EMS has power limit in condition 3 and no power limit in condition 4.

[0044] (3) The discharge output range of the grid-type energy storage system is 25%P n -50% P n The energy storage EMS has power limit in condition 5 and no power limit in condition 6.

[0045] (4) The discharge interval of the grid-type energy storage system is 65%P n -90%P n The energy storage EMS has power limit in condition 7 and no power limit in condition 8.

[0046] Example 3

[0047] On-site test wiring Figure 1 As shown, a grid-type energy storage system inertia response test is implemented in the following steps:

[0048] Step 1: With the consent of the power system dispatching organization, the energy storage system EMS local control and exit the primary frequency regulation control function;

[0049] Step 2, the frequency signal generating device sends a frequency change disturbance signal to perform an inertia response test to test the response characteristics of the voltage source type wind turbine generator set under the condition of frequency change disturbance;

[0050] The frequency change disturbance test includes 50Hz~48Hz, 50Hz~51.5Hz, 50Hz~48Hz~51.5Hz, 50Hz~51.5Hz~48Hz:

[0051] (1) The change from 50 Hz to 48 Hz is from 50 Hz to 48 Hz, with the frequency change rates of 0.1 Hz and 0.5 Hz respectively. After reaching the set value, it lasts for 15 seconds and then returns to 50 Hz. The energy storage system is tested under conditions 1, 2, 3, 4, 5, 6, 7 and 8 respectively;

[0052] (2) The change from 50 Hz to 51.5 Hz is from 50 Hz to 51.5 Hz, with the frequency change rates of 0.1 Hz and 0.5 Hz respectively. After reaching the set value, it lasts for 15 seconds and then returns to 50 Hz. The energy storage system is tested under conditions 1, 2, 3, 4, 5, 6, 7 and 8 respectively;

[0053] (3) The change of 50Hz~48Hz~51.5Hz is from 50Hz to 48Hz, the frequency change rate is 0.1Hz and 0.5Hz respectively, and it lasts for 15s after reaching the set value, then to 51.5Hz, the frequency change rate is 0.1Hz and 0.5Hz respectively, and it lasts for 15s after reaching the set value and then returns to 50Hz. The energy storage system is tested under working conditions 1, working condition 2, working condition 3, working condition 4, working condition 5, working condition 6, working condition 7 and working condition 8 respectively;

[0054] (4) The change of 50Hz~51.5Hz~48Hz is from 50Hz to 51.5Hz, the frequency change rates are 0.1Hz and 0.5Hz respectively, and it lasts for 15s after reaching the set value, then to 48Hz, the frequency change rates are 0.1Hz and 0.5Hz respectively, and it lasts for 15s after reaching the set value and then returns to 50Hz. The energy storage system is tested under working conditions 1, working condition 2, working condition 3, working condition 4, working condition 5, working condition 6, working condition 7 and working condition 8 respectively.

[0055] Step 3: The data recorder and analyzer collects the voltage and current signals of the grid-connected point of the grid-connected energy storage system in real time; and tests the response characteristics (rise time, maximum active power regulation and steady-state deviation) of the grid-connected energy storage system under the condition of frequency change disturbance.

[0056] Step 4: Calculate and analyze the inertia response of the grid-connected energy storage system: rise time, maximum active power regulation and steady-state deviation, and comprehensively evaluate the response performance of the grid-connected energy storage system.

[0057] The inertia response test method of the grid-type energy storage system of the present invention can send a frequency setting value signal through a frequency signal generating device, and a data recording and analyzing instrument can collect signals such as voltage and current of a grid-connected point of the energy storage system in real time, analyze and calculate the inertia response performance, accurately evaluate the inertia response performance of the grid-type energy storage system, and grasp the active support capability of the energy storage inertia.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing the inertia response of a grid-type energy storage system, characterized in that: Follow the steps below to implement it: Step 1: Before testing, exit the AGC and primary frequency control functions of the energy storage power station; Step 2, setting parameters of the data recorder analyzer and the frequency signal generator; Step 3, setting the energy storage system to operate and recharge; Step 4: The frequency signal generating device sends a frequency change disturbance signal to perform an inertia response test; Step 5, set the energy storage system to run and discharge state, and repeat step 4; Step 6: The data recorder analyzer collects data in real time; Step 7: Calculate and analyze the inertia response of the energy storage system, and comprehensively evaluate the response performance of the grid-type energy storage system.

2. According to the inertia response test method of the grid-type energy storage system according to claim 1, the step 2 is specifically: connecting the frequency signal generating device to the energy storage system and the data recording and analyzing instrument respectively, setting the sampling frequency, PT / CT ratio, and grid connection point voltage amplitude of the data recording and analyzing instrument, and setting the frequency setting value, frequency resolution, and frequency change rate of the frequency signal generating device.

3. The inertia response test method of the grid-type energy storage system according to claim 1 is characterized in that: The step 6 is specifically as follows: the data recorder and analyzer collects the voltage and current signals of the grid connection point of the energy storage system in real time, and then tests the response characteristics of the energy storage system under the disturbance of frequency change.

4. The inertia response test method of a grid-type energy storage system according to claim 1, characterized in that: The charging and discharging power of the energy storage system is tested at several points and the critical points must be tested.

5. The inertia response test method of the grid-type energy storage system according to claim 1 is characterized in that: When conducting the inertia response test, the energy storage system should maintain stable operation, the energy storage system control function should be switched to manual control, the primary frequency regulation function should be exited, the energy storage system charge and discharge should not be less than 90% Pn, and the test data collected by the control system should cover the frequency fluctuation range and frequency change rate. The next test should be carried out after the station power regulation is stable.

6. The inertia response test method of the grid-type energy storage system according to claim 1 is characterized in that: When the frequency change rate and frequency deviation of the test point of the grid-type energy storage system exceed the threshold, the energy storage system should be able to respond to the frequency change of the system and provide inertia support; by testing and calculating and analyzing the response characteristics of the grid-type energy storage system under frequency change disturbances, the inertia response performance of the grid-type energy storage system is comprehensively evaluated.

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