A frequency anti-misoperation method and system based on wide-area low-frequency centralized pump cut

Abstract

The application discloses a frequency anti-misoperation method and system based on wide-area low-frequency centralized pump cutting, and the method comprises the following steps: receiving the frequency of operating equipment sent by each transformer substation or energy storage power plant; starting a low-frequency centralized control device if the frequency of any current operating equipment is less than or equal to a starting frequency; calculating a frequency comprehensive value of the operating equipment, and determining a measured frequency of the low-frequency centralized control device; and cutting the pump load of each energy storage power plant according to a preset pump cutting number when the measured frequency is lower than a preset action frequency and reaches an action delay. The frequency anti-misoperation method based on wide-area low-frequency centralized pump cutting can effectively realize frequency anti-misoperation by means of the frequency of operating equipment of different power plants and substations, so that the stability of the power system is maintained.

Description

Technical Field

[0001] This application relates to the field of power system dispatching, operation and control technology, and in particular to a frequency misoperation prevention method and system based on wide-area low-frequency centralized pump switching. Background Technology

[0002] Currently, in the daily operation of the power grid, when an active power deficit occurs in the entire power system or a disconnected local system, causing a frequency drop, a sufficient number of less important loads should be automatically disconnected according to the magnitude of the frequency drop to ensure the safe operation of the system and uninterrupted power supply to important users. Pumped storage power stations are currently a widely used and large-capacity energy storage technology in the power system, mainly configured in the grid for peak shaving, phase regulation, emergency backup, and black start functions. However, for situations involving power system power deficits, existing technologies lack a method for centralized pump disconnection and accurate and stable frequency control, resulting in unsatisfactory frequency regulation and poor stability of the power system. Summary of the Invention

[0003] The purpose of this application is to provide a frequency misoperation prevention method based on wide-area low-frequency centralized pump switching, which can accurately and effectively control frequency stability and maintain the stability of the power system when there is a power shortage.

[0004] To achieve the above objectives, this application provides a frequency misoperation prevention method based on wide-area low-frequency centralized pump switching, comprising:

[0005] Receive the frequencies of the operating equipment sent by each substation or energy storage plant. If the frequency of any operating equipment is less than or equal to the starting frequency, start the low-frequency centralized control device.

[0006] Calculate the comprehensive frequency value of the operating equipment to determine the measurement frequency of the low-frequency centralized control device;

[0007] When the measurement frequency is lower than the preset "action frequency" and the "action delay" is reached, the pump load of each energy storage power plant is cut off according to the preset "number of pumps to be cut off" setting.

[0008] Furthermore, preferably, before receiving the frequencies of the operating equipment transmitted by each substation or energy storage plant, the method further includes:

[0009] Set the action cycle and start frequency of the low-frequency centralized control device, and set the "action frequency", "action delay" and "number of pumps to be cut off" values ​​for each action cycle.

[0010] Further, as a preferred embodiment, the determination of the measurement frequency of the low-frequency centralized control device by calculating the comprehensive frequency value of the operating equipment includes:

[0011] The frequencies of the operating equipment at each substation or energy storage plant are received. Let i be the substation or energy storage plant, and n be the number of operating devices. The calculation is performed according to the following formula:

[0012]

[0013] In the formula, f in f is the actual frequency of the operating equipment n in the substation or energy storage plant i. imin f is the minimum frequency of the operating equipment in substation or energy storage plant i. imax This represents the maximum frequency of the operating equipment in substation or energy storage plant i.

[0014] When the low-frequency centralized control device can simultaneously acquire frequencies transmitted from two or more substations or energy storage plants, the measurement frequency of the low-frequency centralized control device is f. imin The second smallest value;

[0015] When the low-frequency centralized control device can only acquire the frequency of one substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is f. imax .

[0016] Furthermore, preferably, when the measurement frequency is lower than a preset "action frequency" and reaches an "action delay", the pump load of each energy storage power plant is cut off according to a preset "number of pumps to be cut off" value, including:

[0017] When f imax Pump switching is performed in the order of rounds after the action frequency is less than that of any round and after the action delay.

[0018] When f imin If the second minimum value is less than the action frequency of any round and after the action delay, the pump is switched in the order of rounds.

[0019] Furthermore, as a preferred embodiment, the frequency misoperation prevention method based on wide-area low-frequency centralized pump switching further includes:

[0020] When the low-frequency centralized control device receives a signal that the frequency of any operating equipment in a substation or energy storage plant is less than or equal to the starting frequency, the device will start after a starting delay.

[0021] This application also provides a frequency misoperation prevention system based on wide-area low-frequency centralized pump switching, including:

[0022] The device start-up unit is used to receive the frequency of the operating equipment sent by each substation or energy storage power plant. If the frequency of any operating equipment is less than or equal to the start-up frequency, the low-frequency centralized control device is started.

[0023] A frequency comprehensive value calculation unit is used to calculate the comprehensive frequency value of the operating equipment and determine the measurement frequency of the low-frequency centralized control device.

[0024] The pump-cutting unit is used to cut off the pump load of each energy storage power plant according to a preset "number of pumps to be cut off" value when the measurement frequency is lower than the preset "operation frequency" and the "operation delay" is reached.

[0025] Furthermore, as a preferred embodiment, the frequency misoperation prevention system based on wide-area low-frequency centralized pump switching also includes:

[0026] The setpoint setting unit is used to set the action cycle and start frequency of the low-frequency centralized control device, and to set the "action frequency", "action delay" and "number of pumps to be cut off" setpoints for each action cycle.

[0027] Furthermore, preferably, the frequency synthesis value calculation unit is also used for:

[0028] The frequencies of the operating equipment at each substation or energy storage plant are received. Let i be the substation or energy storage plant, and n be the number of operating devices. The calculation is performed according to the following formula:

[0029]

[0030] In the formula, f in f is the actual frequency of the operating equipment n in the substation or energy storage plant i. imin f is the minimum frequency of the operating equipment in substation or energy storage plant i. imax This represents the maximum frequency of the operating equipment in substation or energy storage plant i.

[0031] When the low-frequency centralized control device can simultaneously acquire frequencies transmitted from two or more substations or energy storage plants, the measurement frequency of the low-frequency centralized control device is f. imin The second smallest value;

[0032] When the low-frequency centralized control device can only acquire the frequency of one substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is f. imax .

[0033] Furthermore, preferably, the pump switching unit is also used for:

[0034] When f imax Pump switching is performed in the order of rounds after the action frequency is less than that of any round and after the action delay.

[0035] When f imin If the second minimum value is less than the action frequency of any round and after the action delay, the pump is switched in the order of rounds.

[0036] Furthermore, preferably, the device activation unit is also used for:

[0037] When the low-frequency centralized control device receives a signal that the frequency of any operating equipment in a substation or energy storage plant is less than or equal to the starting frequency, the device will start after a starting delay.

[0038] Compared to existing technologies, the advantages of this application are as follows:

[0039] This application discloses a frequency misoperation prevention method and device based on wide-area low-frequency centralized pump switching. The method includes: receiving the frequency of the operating equipment sent by each substation or energy storage power plant; if the frequency of any operating equipment is less than or equal to the starting frequency, activating the low-frequency centralized control device; calculating the comprehensive frequency value of the operating equipment and determining the measurement frequency of the low-frequency centralized control device; when the measured frequency is lower than a preset "action frequency" and reaches the "action delay", cutting off the pump load of each energy storage power plant according to a preset "number of pumps to be cut off" value.

[0040] The frequency misoperation prevention method based on wide-area low-frequency centralized pump switching provided in this application effectively prevents frequency misoperation by relying on the frequencies of operating equipment in different power plants and substations, thereby achieving the goal of stabilizing the power system frequency and contributing to the maintenance of power system stability. Attached Figure Description

[0041] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating a frequency misoperation prevention method based on wide-area low-frequency centralized pump switching according to a certain embodiment of this application;

[0043] Figure 2 This is a data interaction diagram between a low-frequency centralized control device and a substation or energy storage power plant provided in a certain embodiment of this application;

[0044] Figure 3 This is a flowchart of the steps of a frequency prevention method based on wide-area low-frequency centralized pump switching provided in a certain embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the structure of a frequency prevention system based on wide-area low-frequency centralized pump switching provided in a certain embodiment of this application. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0047] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0048] It should be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0049] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0050] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0051] To aid understanding, the relevant terms used in this application will first be explained:

[0052] Automatic low-frequency load shedding: When the entire power system or a local system after disconnection experiences an active power deficit that causes a frequency drop, a sufficient number of less important loads are automatically disconnected based on the magnitude of the frequency drop to ensure the safe operation of the system and uninterrupted power supply to important users.

[0053] Pumped storage power plants are hydroelectric power stations that use electricity during off-peak hours to pump water to the upper reservoir and release water to the lower reservoir to generate electricity during peak hours. Pumping is defined as the load condition and releasing is defined as the power supply condition. This paper considers pumped storage power stations as pumping operations.

[0054] Load Types: Loads are classified according to the different reliability requirements of the power system. Category I loads are those whose power outage would cause personal injury or death, major equipment damage that is difficult to repair, or significant political and economic losses. Category II loads are those whose power outage would result in a large amount of waste, material scrap, significant production reduction, or major equipment damage accidents, but which can be avoided by taking appropriate measures. Category III loads are all electrical equipment that does not belong to Category I or II. When the system frequency decreases, the priority order for shelving loads is: first, Category III loads; then, Category II loads; and finally, Category I loads.

[0055] Please see Figure 1 This application provides a frequency misoperation prevention method based on wide-area low-frequency centralized pump switching in one embodiment. For example... Figure 1 As shown, the frequency misoperation prevention method based on wide-area low-frequency centralized pump switching includes steps S10 to S30. The specific steps are as follows:

[0056] S10. Receive the frequency of the operating equipment sent by each substation or energy storage plant. If the frequency of any operating equipment is less than or equal to the starting frequency, start the low-frequency centralized control device.

[0057] In this embodiment, the low-frequency centralized control device first needs to receive the frequencies of the operating equipment sent by each substation or energy storage power plant, such as... Figure 2 As shown, there can be multiple substations or energy storage plants. The operating equipment mainly includes primary equipment such as lines, busbars, and main transformers; frequency data is obtained from these primary devices. When the low-frequency centralized control device receives the frequency of the operating equipment, it determines whether the frequency of any currently operating equipment is less than or equal to the starting frequency. Only if the frequency is less than or equal to the starting frequency will the low-frequency centralized control device be activated. The low-frequency centralized control device can exist within a control module of the low-frequency centralized control system or it can be an independent device.

[0058] In one embodiment, when the low-frequency centralized control device receives a signal that the frequency of any operating equipment in a substation or energy storage plant is less than or equal to the starting frequency, the device starts after a starting delay.

[0059] In a specific implementation, before executing step S10, it is usually necessary to set the action cycle and start frequency of the low-frequency centralized control device, and set the "action frequency", "action delay" and "number of pumps to be cut off" values ​​for each action cycle.

[0060] Preferably, this embodiment sets 5 independent cycles, as shown in Table 1 below. Each cycle has set values ​​for "action frequency fdz", "action delay Tdz", and "number of pumps to be cut off". In this embodiment, the action logic of the low-frequency centralized control device is consistent with traditional low-frequency load shedding; that is, when the comprehensive value of the frequencies involved in the logic is lower than the low-frequency "action frequency" of any cycle and reaches the "action delay", the pump load is cut off according to the set value of "number of pumps to be cut off".

[0061] Table 1 Examples of Wide-Area Low-Frequency Centralized Pump Switching Setpoints

[0062]

[0063] S20. Calculate the comprehensive frequency value of the operating equipment and determine the measurement frequency of the low-frequency centralized control device.

[0064] In this embodiment, the function of centralized low-frequency pump switching is realized by a low-frequency centralized control device, and the frequency is taken from the comprehensive frequency value f of the operating equipment sent by each substation or energy storage power plant. s The method for selecting the comprehensive value is the core content of frequency error prevention.

[0065] In a specific embodiment, step S20 further includes:

[0066] 1) Receive the frequencies of the operating equipment from each substation or energy storage plant. Let i be the substation or energy storage plant and n be the operating equipment. Calculate using the following formula:

[0067]

[0068] In the formula, f in f is the actual frequency of the operating equipment n in the substation or energy storage plant i. imin f is the minimum frequency of the operating equipment in substation or energy storage plant i. imax This represents the maximum frequency of the operating equipment in substation or energy storage plant i.

[0069] In this embodiment, if the energy storage power plant 1 has two operating devices, then the frequency of the operating devices sent to the low-frequency centralized control device is f. 11 and f 12 If substation 6 has 4 operating devices, then the frequency of the operating devices sent to the low-frequency centralized control device is f. 61 f 62 f 63 and f 64 It should be noted that frequencies below 45Hz are invalid and do not participate in the judgment.

[0070] 2) When the low-frequency centralized control device can simultaneously acquire the frequencies transmitted from two or more substations or energy storage plants, the measurement frequency of the low-frequency centralized control device shall be f. imin The second smallest value;

[0071] According to operation 2), it can ensure that the frequency of at least one operating device in each of the two substations or energy storage plants participates in the logic judgment. It realizes the selection of frequency measurement of different substations or energy storage plants. At least two frequencies must meet the low frequency setting value in any round before the action is allowed. This can ensure the accuracy of multi-point frequency measurement and has a good anti-misoperation function.

[0072] 3) When the low-frequency centralized control device can only acquire the frequency of one substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device shall be f. imax .

[0073] According to operation 3), all operating equipment in a substation or energy storage plant must meet the low-frequency setpoint for any given round before operation is permitted. Specifically, a low-frequency pump-cutting function pressure plate is set for each energy storage plant by the low-frequency centralized control device. When this pressure plate is deactivated, the corresponding energy storage plant's units do not participate in low-frequency pump-cutting, but their operating lines still participate in the low-frequency comprehensive value calculation.

[0074] S30. When the measurement frequency is lower than the preset "action frequency" and the "action delay" is reached, the pump load of each energy storage power plant is cut off according to the preset "number of pumps to be cut off" setting.

[0075] Specifically, when f imax Pump switching is performed sequentially according to the cycle number after the action delay if the action frequency is less than that of any round; when f imin If the second minimum value is less than the action frequency of any round and after the action delay, the pump is switched in the order of rounds.

[0076] The frequency misoperation prevention method based on wide-area low-frequency centralized pump switching provided in this application embodiment effectively achieves frequency misoperation prevention by relying on the frequencies of operating equipment in different power plants, thereby stabilizing the power system frequency and helping to maintain the stability of the power system.

[0077] Please see Figure 3 , Figure 3 The procedure flow for a frequency misoperation prevention method based on wide-area low-frequency centralized pump switching is provided. For example... Figure 3As shown, the power system is initially in normal operation. When the frequency of the operating equipment transmitted by the substation or storage power plant to the low-frequency centralized control device is less than or equal to the device's startup frequency, the low-frequency centralized control device starts. If the device can only acquire the frequency transmitted by one substation or storage power plant, the maximum value among all operating equipment frequencies transmitted by that substation or storage power plant is taken as the device's measurement frequency. This ensures that the device's measurement frequency is less than the operating frequency of any round, and when the "action delay" setting is reached, a low-frequency action is executed, and pumps are switched off according to the round. If the low-frequency centralized control device can acquire the frequencies transmitted by two or more substations or storage power plants, the second smallest value among all operating equipment frequencies transmitted by that substation or storage power plant is taken as the device's measurement frequency. This ensures that the device's measurement frequency is less than the operating frequency of any round, and when the "action delay" setting is reached, a low-frequency action is executed, and pumps are switched off according to the round.

[0078] To aid in understanding the solution provided in this application, several embodiments will be described in detail below. The relevant setting values ​​for the low-frequency centralized control device are referenced in Table 1:

[0079] Example 1:

[0080] Assuming three substations or energy storage plants are involved, and each substation or energy storage plant transmits frequencies to two operating devices:

[0081] Pumped storage power plant 1 transmits power at the following frequency: f 11 =49.58, f 12 =49.62;

[0082] Pumped storage power plant 2 uplink frequency: f 21 =49.56, f 22 =49.64;

[0083] Substation 3 transmits frequency: f 31 =49.54, f 32 =49.66;

[0084] The minimum frequency values ​​calculated by the low-frequency centralized control device for the operating equipment transmitted from storage power plant 1, storage power plant 2, and substation 3 are as follows:

[0085] f 1min =min(f 11 f 12 )=min(49.58, 49.62)=49.58;

[0086] f 2min =min(f 21 f 22 )=min(49.56, 49.64)=49.56;

[0087] f 3min =min(f 31 f 32 )=min(49.54, 49.66)=49.54;

[0088] Therefore, the measurement frequency f of the low-frequency centralized control device s Take the above 3 sub-sites f imin The second smallest value, i.e., f s =49.56. This method of taking the value effectively ensures that at least one operating device in each of the two different sites, namely the energy storage power plant 2 and the substation 3, has a frequency lower than the first round of low-frequency "action frequency fdz". When the duration reaches 1.5s, the first round of low-frequency action will be activated, and one pump will be cut off.

[0089] Example 2:

[0090] Assuming three energy storage plants participate, and each plant transmits the frequencies of four operating devices, and assuming the frequencies of each operating device are transmitted as follows:

[0091] Pumped storage power plant 4 uplink frequency: f 41 =44.00, f 42 =48.83, f 43 =48.84, f 44 =48.85;

[0092] Pumped storage power plant 5 uplink frequency: f 51 =48.88, f 52 =48.85, f 53 =48.86, f 54 =48.87;

[0093] Pumped storage power plant 6 uplink frequency: f 61 =48.87, f 62 =48.89, f 63 =48.88, f 64 =48.90;

[0094] The minimum frequency values ​​for the operating equipment transmitted from storage power plants 4, 5, and 6 by the low-frequency centralized control device are calculated as follows:

[0095] f 4min =min(f 41 f 42 f 43 f 44 ) = 48.83;

[0096] f 5min =min(f 51 f 52 f53 f 54 ) = 48.85;

[0097] f 6min =min(f 61 f 62 f 63 f 64 ) = 48.87;

[0098] At this time, the measurement frequency f of the low-frequency centralized control device s Take the above 3 sub-sites f imin The second smallest value, i.e., f s =48.85. This value method effectively ensures that at least one of the two different energy storage plants, energy storage plant 4 and energy storage plant 5, has an operating frequency lower than the "action frequency fdz" of the first, second, third and fourth rounds of low frequency. When the duration reaches 0.6s, the fourth round of low frequency action will cut off 2 pumps.

[0099] It should be noted that the reason for f 4min =min(f 41 f 42 f 43 f 44 The value is 48.83 because the frequency of one operating device in the pumped storage power plant 4 is 44Hz, which is identified as an invalid frequency by the low-frequency centralized control device and excluded from the frequency comprehensive value calculation. The frequencies of the other operating devices are all around 48.8Hz, and do not affect the frequency comprehensive value calculation. That is, from f... 42 f 43 f 44 The smallest frequency was selected, which is 48.83.

[0100] Furthermore, since a system frequency drop typically affects the entire or a portion of the power grid, it can cause a simultaneous frequency drop at multiple points within the system. Therefore, frequency measurements from multiple operating devices at different sites can more accurately reflect the system frequency. Consequently, the larger the sample size of the measured frequencies, the stronger the error prevention capability of the frequency composite value calculation method. In practical applications, the sample size of the measured frequencies can be determined according to actual needs, and no restrictions are imposed here.

[0101] Example 3:

[0102] Assuming only the 4th energy storage plant participates in transmitting power to the 4 operating devices at the required frequency:

[0103] Pumped storage power plant 4 uplink frequency: f 41 =49.02, f 42 =48.98, f 43 =49.00, f 44 =48.96;

[0104] The low-frequency centralized control device calculates the maximum frequency of the operating equipment supplied by the energy storage power plant 4 as follows:

[0105] f 4max =max(f 41 f 42 f 43 f 44 ) = 49.02;

[0106] Therefore, the measurement frequency f of the device at this time s Take the maximum value f of the frequencies of all operating devices. imax That is, f s =49.02. This method of taking a value effectively ensures that the frequency of all operating equipment in the substation or energy storage plant is lower than the "action frequency fdz" of the first, second and third rounds of low frequency. When the duration reaches 0.9s, the third round of low frequency action will cut off 1 pump.

[0107] Please see Figure 4 This application also provides a frequency misoperation prevention system based on wide-area low-frequency centralized pump switching, including:

[0108] The device start-up unit 01 is used to receive the frequency of the operating equipment sent by each substation or energy storage power plant. If the frequency of any operating equipment is less than or equal to the start-up frequency, the low-frequency centralized control device is started.

[0109] Frequency comprehensive value calculation unit 02 is used to calculate the frequency comprehensive value of the operating equipment and determine the measurement frequency of the low-frequency centralized control device.

[0110] Pump cutting unit 03 is used to cut off the pump load of each energy storage power plant according to the preset "number of pumps to be cut off" when the measurement frequency is lower than the preset "operation frequency" and the "operation delay" is reached.

[0111] In a specific implementation, the frequency misoperation prevention system based on wide-area low-frequency centralized pump switching also includes:

[0112] The setpoint setting unit is used to set the action cycle and start frequency of the low-frequency centralized control device, and to set the "action frequency" setpoint, "action delay" setpoint and pump cut-off setpoint for each action cycle.

[0113] In a specific implementation, the frequency synthesis value calculation unit 02 is also used for:

[0114] The frequencies of the operating equipment at each substation or energy storage plant are received. Let i be the substation or energy storage plant, and n be the number of operating devices. The calculation is performed according to the following formula:

[0115]

[0116] In the formula, fin f is the actual frequency of the operating equipment n in the substation or energy storage plant i. imin f is the minimum frequency of the operating equipment in substation or energy storage plant i. imax This represents the maximum frequency of the operating equipment in substation or energy storage plant i.

[0117] When the low-frequency centralized control device can simultaneously acquire frequencies transmitted from two or more substations or energy storage plants, the measurement frequency of the low-frequency centralized control device is f. imin The second smallest value;

[0118] When the low-frequency centralized control device can only acquire the frequency of one substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is f. imax .

[0119] In a specific implementation, pump-cutting unit 03 is also used for:

[0120] When f imax Pump switching is performed in the order of rounds after the action frequency is less than that of any round and after the action delay.

[0121] When f imin If the second minimum value is less than the action frequency of any round and after the action delay, the pump is switched in the order of rounds.

[0122] In a specific implementation, the device start-up unit 01 is also used to start the device after a start-up delay when the low-frequency centralized control device receives a frequency of any operating equipment in a substation or energy storage power plant that is less than or equal to the start-up frequency.

[0123] It is understood that the system provided in this embodiment is used to execute the methods described in the above embodiments and achieve the same technical effects as the methods described above, and will not be described in further detail here.

[0124] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in practical applications, there may be other division methods. For example, multiple units or page components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0125] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0126] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0127] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A frequency misoperation prevention method based on wide-area low-frequency centralized pump switching, characterized in that, include: Receive the frequencies of the operating equipment sent by each substation or energy storage plant. If the frequency of any operating equipment is less than or equal to the starting frequency, start the low-frequency centralized control device. Calculating the comprehensive frequency value of the operating equipment and determining the measurement frequency of the low-frequency centralized control device includes: receiving the frequency of the operating equipment of each substation or energy storage plant, assuming the substation or energy storage plant is... The operating equipment is The number of items is calculated according to the following formula: ； In the formula, For substations or energy storage plants middle The actual frequency of the operating equipment, For substations or energy storage plants The minimum operating frequency of the equipment in the middle. For substations or energy storage plants The maximum value of the operating frequency of the equipment; When the low-frequency centralized control device can simultaneously acquire frequencies transmitted from two or more substations or energy storage plants, the measurement frequency of the low-frequency centralized control device is taken as... The second smallest value; When the low-frequency centralized control device can only acquire the frequency of one substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is taken as follows: ; When the measurement frequency is lower than the preset "action frequency" and the "action delay" is reached, the pump load of each energy storage power plant is cut off according to the preset "number of pumps to be cut off" setting.

2. The frequency misoperation prevention method based on wide-area low-frequency centralized pump switching according to claim 1, characterized in that, Before receiving the frequencies of the operating equipment from each substation or energy storage plant, the method further includes: Set the action cycle and start frequency of the low-frequency centralized control device, and set the "action frequency", "action delay" and "number of pumps to be cut off" values ​​for each action cycle.

3. The frequency misoperation prevention method based on wide-area low-frequency centralized pump switching according to claim 1, characterized in that, When the measurement frequency is lower than the preset "operation frequency" and reaches the "operation delay", the pump load of each energy storage power plant is cut off according to the preset "number of pumps to be cut off" setting, including: when Pump switching is performed in the order of rounds after the action frequency is less than that of any round and after the action delay. when If the second minimum value is less than the action frequency of any round and after the action delay, the pump is switched in the order of rounds.

4. The frequency misoperation prevention method based on wide-area low-frequency centralized pump switching according to claim 1, characterized in that, Also includes: When the low-frequency centralized control device receives a signal that the frequency of any operating equipment in a substation or energy storage plant is less than or equal to the starting frequency, the device will start after a starting delay.

5. A frequency misoperation prevention system based on wide-area low-frequency centralized pump switching, characterized in that, include: The device start-up unit is used to receive the frequency of the operating equipment sent by each substation or energy storage power plant. If the frequency of any operating equipment is less than or equal to the start-up frequency, the low-frequency centralized control device is started. The frequency comprehensive value calculation unit is used to calculate the comprehensive frequency value of the operating equipment and determine the measurement frequency of the low-frequency centralized control device, including: receiving the frequency of the operating equipment of each substation or energy storage plant, assuming the substation or energy storage plant is... The operating equipment is The number of items is calculated according to the following formula: ； In the formula, For substations or energy storage plants middle The actual frequency of the operating equipment, For substations or energy storage plants The minimum operating frequency of the equipment in the middle. For substations or energy storage plants The maximum value of the operating frequency of the equipment; When the low-frequency centralized control device can simultaneously acquire frequencies transmitted from two or more substations or energy storage plants, the measurement frequency of the low-frequency centralized control device is taken as... The second smallest value; When the low-frequency centralized control device can only acquire the frequency of one substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is taken as follows: ; The pump-cutting unit is used to cut off the pump load of each energy storage power plant according to a preset "number of pumps to be cut off" value when the measurement frequency is lower than the preset "operation frequency" and the "operation delay" is reached.

6. The frequency misoperation prevention system based on wide-area low-frequency centralized pump switching according to claim 5, characterized in that, Also includes: The setpoint setting unit is used to set the action cycle and start frequency of the low-frequency centralized control device, and to set the "action frequency", "action delay" and "number of pumps to be cut off" setpoints for each action cycle.

7. The frequency misoperation prevention system based on wide-area low-frequency centralized pump switching according to claim 5, characterized in that, The pump switching unit is also used for: when Pump switching is performed in the order of rounds after the action frequency is less than that of any round and after the action delay. when If the second minimum value is less than the action frequency of any round and after the action delay, the pump is switched in the order of rounds.

8. The frequency misoperation prevention system based on wide-area low-frequency centralized pump switching according to claim 5, characterized in that, The device activation unit is also used for: When the low-frequency centralized control device receives a signal that the frequency of any operating equipment in a substation or energy storage plant is less than or equal to the starting frequency, the device will start after a starting delay.

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