A frequency voltage emergency control method and device considering load unit state, equipment and storage medium

Abstract

The application discloses a frequency voltage emergency control method and device considering load unit state, equipment and storage medium, the method first collects the first voltage and the first frequency of each high voltage level bus in the transformer substation, the second voltage and the second frequency of each low voltage level load unit; if the first frequency of any high voltage level bus is lower than the preset low frequency action setting value, and the delay reaches the preset low frequency action delay setting value, the low frequency load shedding function acts, and the first target load unit is cut off according to the preset load unit cut-off priority; if the first voltage of any high voltage level bus is lower than the preset low voltage action setting value, and the delay reaches the preset low voltage action delay setting value, the low voltage load shedding function acts, and the second target load unit is cut off according to the preset load unit cut-off priority. Through the implementation of the application, the mis-cut of the non-fault load unit can be prevented, and the adaptability and action correctness of the low frequency and low voltage load shedding strategy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of load unit removal, and in particular to a frequency and voltage emergency control method, device, equipment and storage medium taking into account the state of the load unit. Background Art

[0002] As a key measure to ensure the safe and stable operation of power grids, low-frequency, low-voltage, and load-shedding measures are widely used in power systems. When a power system fault occurs and the system frequency or voltage drops to a predetermined value, secondary equipment such as low-frequency, low-voltage, and load-shedding devices are often required to quickly remove a certain amount of load to stabilize the power system.

[0003] In the existing technology, by grouping and adjusting the busbars in the power system, the buses in the same group jointly participate in the logical judgment and action output of low frequency and low voltage. When the frequency or voltage value of any busbar in the group meets the strategy judgment conditions of the group, the load units corresponding to each round in the busbar group are directly cut off according to the action round setting value of each load unit, resulting in the erroneous cutting off of load units that are not in the same power supply area as the busbar group, and the load reduction effect cannot be achieved. Summary of the Invention

[0004] The embodiments of the present invention provide a frequency and voltage emergency control method, apparatus, device and storage medium that take into account the state of load units, which can prevent the erroneous removal of fault-free load units and improve the adaptability and correctness of the low-frequency and low-voltage load reduction strategy.

[0005] An embodiment of the present invention provides a frequency and voltage emergency control method considering load unit status, including:

[0006] Real-time collection of the first voltage and first frequency of each high-voltage busbar in the substation, and the second voltage and second frequency of each low-voltage load unit; wherein the secondary voltage circuits corresponding to each high-voltage busbar and each low-voltage load unit are connected to a low-frequency and low-voltage load reduction device;

[0007] The above-mentioned first frequency of each of the above-mentioned high-voltage busbars is compared with the preset low-frequency action value to determine whether the low-frequency load shedding function action conditions are met; if the above-mentioned first frequency of any of the above-mentioned high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function is activated, the affected first target load unit is determined, and the above-mentioned first target load unit is shelved according to the preset load unit shedding priority; wherein, the above-mentioned first target load unit is: the load unit whose above-mentioned second frequency is continuously lower than the preset load error prevention shedding frequency from the preset time value before the above-mentioned low-frequency load shedding function action moment to the above-mentioned low-frequency load shedding function action moment;

[0008] The above-mentioned first voltage of each of the above-mentioned high-voltage grade busbars is compared with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the above-mentioned first voltage of any of the above-mentioned high-voltage grade busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function is activated, the affected second target load unit is determined, and the above-mentioned second target load unit is cut off according to the preset load unit cut-off priority; wherein, the above-mentioned second target load unit is: from the preset time value before the above-mentioned low-voltage load shedding function action moment to the above-mentioned low-voltage load shedding function action moment, the above-mentioned second target load unit is: the load unit whose above-mentioned second voltage is continuously lower than the preset load error prevention cut-off voltage.

[0009] Furthermore, before comparing the first frequency of each of the high-voltage busbars with a preset low-frequency action value, the method further includes:

[0010] Obtain the first frequency drop rate of each high-voltage bus at the current moment;

[0011] Comparing the first frequency reduction rate with a preset frequency reduction blocking value;

[0012] The high-voltage bus whose first frequency reduction rate is greater than the preset frequency reduction blocking value is used as the first target blocking bus, and the low-frequency load shedding function of the first target blocking bus is blocked.

[0013] Furthermore, before comparing the first voltage of each of the high-voltage busbars with a preset low-voltage action value, the method further includes:

[0014] Obtain the first voltage drop rate of each high-voltage bus at the current moment;

[0015] Comparing the first voltage drop rate with a preset voltage drop lockout value;

[0016] The high-voltage bus whose first voltage drop rate is greater than the preset voltage drop blocking value is used as the second target blocking bus, and the low-voltage load shedding function of the second target blocking bus is blocked.

[0017] Furthermore, after locking the low-frequency load shedding function of the first target locking bus, the method further includes:

[0018] The low-frequency load shedding function of the first target blocking bus is blocked until the first frequency of the first target blocking bus returns to a normal range.

[0019] Furthermore, after locking the low-voltage load shedding function of the second target locking bus, the method further includes:

[0020] The low-voltage load shedding function of the second target blocking bus is blocked until the first voltage of the second target blocking bus returns to a normal range.

[0021] Based on the above method embodiment, the present invention provides a corresponding device embodiment;

[0022] An embodiment of the present invention provides a frequency and voltage emergency control device that takes into account the state of a load unit, including:

[0023] bus voltage and frequency acquisition module, first target load unit removal module, second target load unit removal module;

[0024] The bus voltage and frequency acquisition module is used to collect the first voltage and first frequency of each high-voltage bus in the substation and the second voltage and second frequency of each low-voltage load unit in real time; wherein, the secondary voltage circuits corresponding to each high-voltage bus and each low-voltage load unit are connected to the low-frequency and low-voltage load reduction device;

[0025] The above-mentioned first target load unit cutting module is used to compare the above-mentioned first frequency of each of the above-mentioned high-voltage busbars with the preset low-frequency action value to determine whether the low-frequency load shedding function action conditions are met; if the above-mentioned first frequency of any of the above-mentioned high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function will be activated, the affected first target load unit will be determined, and the above-mentioned first target load unit will be cut off according to the preset load unit cutting priority; wherein, the above-mentioned first target load unit is: from the preset time value before the above-mentioned low-frequency load shedding function action moment to the above-mentioned low-frequency load shedding function action moment, the above-mentioned second frequency is continuously lower than the preset load error prevention cutting frequency;

[0026] The above-mentioned second target load unit cutting module is used to compare the above-mentioned first voltage of each of the above-mentioned high-voltage busbars with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the above-mentioned first voltage of any of the above-mentioned high-voltage busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function will be activated, the affected second target load unit will be determined, and the above-mentioned second target load unit will be cut off according to the preset load unit cutting priority; wherein, the above-mentioned second target load unit is: from the preset time value before the above-mentioned low-voltage load shedding function action moment to the above-mentioned low-voltage load shedding function action moment, the above-mentioned second target load unit is: the load unit whose above-mentioned second voltage is continuously lower than the preset load error prevention cutting voltage.

[0027] Furthermore, it also includes: a first target locking bus locking module;

[0028] The above-mentioned first target locked bus determination module is used to obtain the first frequency reduction rate of each high-voltage level bus at the current moment; compare the above-mentioned first frequency reduction rate with the preset frequency reduction locking set value; use the high-voltage level bus whose first frequency reduction rate is greater than the above-mentioned preset frequency reduction locking set value as the first target locked bus, and lock the low-frequency load shedding function of the first target locked bus.

[0029] Furthermore, it also includes: a second target locking bus locking module;

[0030] The above-mentioned second target locking bus locking module is used to obtain the first voltage drop rate of each high-voltage level bus at the current moment; compare the above-mentioned first voltage drop rate with the preset voltage drop locking value; use the high-voltage level bus whose first voltage drop rate is greater than the above-mentioned preset voltage drop locking value as the second target locking bus, and lock the low-voltage load shedding function of the second target locking bus.

[0031] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment;

[0032] The present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the frequency and voltage emergency control method considering the load unit state described in any embodiment of the present invention.

[0033] Based on the above method embodiment, the present invention provides a storage medium embodiment;

[0034] The present invention provides a storage medium comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the frequency and voltage emergency control method considering the load unit state described in any embodiment of the present invention is implemented.

[0035] The embodiments of the present invention have the following beneficial effects:

[0036] The present invention provides a frequency and voltage emergency control method, device, terminal equipment and storage medium that take into account the state of load units. The above method first collects the first voltage and first frequency of each high-voltage busbar in the substation, and the second voltage and second frequency of each low-voltage load unit in real time; wherein, the secondary voltage circuit corresponding to each high-voltage busbar and each low-voltage load unit is connected to a low-frequency and low-voltage load reduction device; then, the above first frequency of each high-voltage busbar is compared with a preset low-frequency action value to determine whether the low-frequency load shedding function action conditions are met; if the above first frequency of any of the above high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function is activated, the affected first target load unit is determined, and the above first target load unit is cut off according to the preset load unit cutting priority; wherein, the above first target load unit is: the preset time before the above low-frequency load shedding function action moment. The load unit whose second frequency is continuously lower than the preset load error prevention cut-off frequency from the preset value to the time when the above-mentioned low-frequency load shedding function is actuated; the above-mentioned first voltage of each of the above-mentioned high-voltage busbars is compared with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the above-mentioned first voltage of any of the above-mentioned high-voltage busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function is actuated, the affected second target load unit is determined, and the above-mentioned second target load unit is cut off according to the preset load unit cut-off priority; wherein, the above-mentioned second target load unit is: the load unit whose second voltage is continuously lower than the preset load error prevention cut-off voltage from the preset time value before the above-mentioned low-voltage load shedding function is actuated to the time when the above-mentioned low-voltage load shedding function is actuated. Therefore, the present invention does not need to group the busbars, and adds a comparison condition between the frequency and voltage of the load unit and the preset low-frequency action constant and the preset low-voltage action constant, so that it can be determined based on the comparison result whether the load unit and the busbar where low frequency and low voltage occur are in the same power supply area, thereby preventing the erroneous cutting off of fault-free load units and improving the adaptability and action correctness of the low-frequency and low-voltage load reduction strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The figure is a flow chart of a frequency and voltage emergency control method considering the load unit status provided by one embodiment of the present invention.

[0038] Figure 2 It is a structural diagram of an equivalent model of a typical power grid provided by an embodiment of the present invention.

[0039] Figure 3 This is a structural diagram of a frequency and voltage emergency control device taking into account the state of a load unit provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a frequency and voltage emergency control method considering the load unit state, including:

[0042] Step S1: Real-time collection of the first voltage and first frequency of each high-voltage busbar in the substation, and the second voltage and second frequency of each low-voltage load unit; wherein the secondary voltage circuits corresponding to each high-voltage busbar and each low-voltage load unit are connected to a low-frequency and low-voltage load reduction device;

[0043] Specifically, the first voltage is the three-phase voltage of each high-voltage bus, and the second voltage is the single-phase voltage of each load unit.

[0044] Step S101: Compare the first frequency of each of the high-voltage busbars with a preset low-frequency action value to determine whether the low-frequency load shedding function action condition is met; if the first frequency of any of the high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function is activated, the affected first target load unit is determined, and the first target load unit is shelved according to the preset load unit shedding priority; wherein the first target load unit is: a load unit whose second frequency is continuously lower than the preset load error prevention shedding frequency from the preset time value before the low-frequency load shedding function is activated to the time when the low-frequency load shedding function is activated;

[0045] Indicative, such as Figure 2 As shown, Figure 2"I mother" and "II mother" are both high-voltage busbars, "1 mother", "2 mother" and "3 mother" are low-voltage busbars connected to the high-voltage busbar "II mother", "4 mother" is a low-voltage busbar connected to the high-voltage busbar "I mother", load units 1, 2, 3 and 4 are all connected to the high-voltage busbar "II mother", and load units 5 and 6 are connected to the high-voltage busbar "I mother". If at this time the first frequency of any of the high-voltage busbars "I mother" and "II mother" is lower than the preset low-frequency action value, and the delay (the time when the first frequency is lower than the preset low-frequency action value) reaches the preset low-frequency action delay value, then the low-frequency load shedding function starts to operate. The load units whose second frequency is continuously lower than the preset load error prevention cut-off frequency from the preset time value before the low-frequency load shedding function is activated to the time when the low-frequency load shedding function is activated will be cut off according to the preset priority.

[0046] Specifically, the above priorities are set in advance by the dispatcher. The load unit with a priority setting of 1 is cut off first, followed by the load unit with a priority setting of 2, and so on. The load unit with a priority setting of 0 cannot be cut off, and the load units with the same priority setting are arranged to be cut off at the same time.

[0047] Indicative, such as Figure 2 As shown, if the current Figure 2 The load units in the list are from load units 1 to 6, and their priorities are 1, 4, 2, 5, 3 and 6, and the load units currently determined as the first target load units are load units 2, 3 and 4, so they are removed in the order of load units 3, 2 and 4.

[0048] In a preferred embodiment, before comparing the first frequency of each of the high-voltage busbars with a preset low-frequency action value, the method further includes:

[0049] Obtain the first frequency drop rate of each high-voltage bus at the current moment;

[0050] Comparing the first frequency reduction rate with a preset frequency reduction blocking value;

[0051] The high-voltage bus whose first frequency reduction rate is greater than the preset frequency reduction blocking value is used as the first target blocking bus, and the low-frequency load shedding function of the first target blocking bus is blocked.

[0052] Indicative, such as Figure 2 As shown, if the first frequency drop rate of "I bus" in the current high-voltage level bus is lower than the preset frequency drop blocking value, the low-frequency load shedding function of "I bus" will be blocked.

[0053] In this preferred embodiment, the high-voltage busbars that need to lock the low-frequency load shedding function are determined by comparing the first frequency drop rate of each high-voltage busbar with the preset frequency drop blocking value in advance.

[0054] In another preferred embodiment, after locking the low-frequency load shedding function of the first target locking bus, the method further includes:

[0055] The low-frequency load shedding function of the first target blocking bus is blocked until the first frequency of the first target blocking bus returns to a normal range.

[0056] Indicative, such as Figure 2 As shown, if "I mother" is the determined first target locked bus, the first frequency of "I mother" will continue to be collected in real time. When the first frequency returns to the normal range, the low-frequency load shedding function of "I mother" will be unlocked.

[0057] In this preferred embodiment, the unlocking condition of the high-voltage busbar whose under-frequency load shedding function is locked is determined.

[0058] Step S102: Compare the above-mentioned first voltage of each of the above-mentioned high-voltage busbars with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the above-mentioned first voltage of any of the above-mentioned high-voltage busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function is activated, the affected second target load unit is determined, and the above-mentioned second target load unit is cut off according to the preset load unit cut-off priority; wherein, the above-mentioned second target load unit is: from the preset time value before the above-mentioned low-voltage load shedding function action moment to the above-mentioned low-voltage load shedding function action moment, the above-mentioned second target load unit is: the load unit whose above-mentioned second voltage is continuously lower than the preset load error prevention cut-off voltage.

[0059] Indicative, such as Figure 2 As shown, if the first voltage of any of the high-voltage busbars "I bus" and "II bus" is lower than the preset low-voltage action value, and the delay (the time during which the first voltage is lower than the preset low-voltage action value) reaches the preset low-voltage action delay value, the low-voltage load shedding function will be activated. The load units whose second voltage is continuously lower than the preset load error prevention voltage from the preset time value before the low-voltage load shedding function is activated to the time when the low-voltage load shedding function is activated will be shelved according to the preset priority.

[0060] Illustratively, if the current priorities of the load units are 1, 4, 2, 5, 3 and 6, respectively, and load unit 2 and load unit 5 are determined as the second target load unit, load unit 5 is cut off first, and then load unit 2 is cut off.

[0061] In a preferred embodiment, before comparing the first voltage of each of the high-voltage busbars with a preset low-voltage action value, the method further includes:

[0062] Obtain the first voltage drop rate of each high-voltage bus at the current moment;

[0063] Comparing the first voltage drop rate with a preset voltage drop lockout value;

[0064] The high-voltage bus whose first voltage drop rate is greater than the preset voltage drop blocking value is used as the second target blocking bus, and the low-voltage load shedding function of the second target blocking bus is blocked.

[0065] Indicative, such as Figure 2 As shown, if the first voltage drop rate of "II bus" in the current high-voltage level bus is lower than the preset voltage drop blocking value, the low-voltage load shedding function of "II bus" will be blocked.

[0066] In this preferred embodiment, the high-voltage busbars that need to lock the low-voltage load shedding function are determined by comparing the first voltage drop rate of each high-voltage busbar with the preset voltage drop lockout value in advance.

[0067] In another preferred embodiment, after locking the low-voltage load shedding function of the second target locking bus, the method further includes:

[0068] The low-voltage load shedding function of the second target blocking bus is blocked until the first voltage of the second target blocking bus returns to a normal range.

[0069] Indicative, such as Figure 2 As shown, if "II bus" is the determined second target locked bus, the first voltage of "II bus" continues to be collected in real time. When the first voltage returns to the normal range, the low-voltage load shedding function of "II bus" is unlocked.

[0070] In this preferred embodiment, the unlocking condition of the high voltage busbar whose low voltage load shedding function is locked is determined.

[0071] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0072] like Figure 3 As shown, an embodiment of the present invention provides a frequency and voltage emergency control device considering the state of a load unit, comprising:

[0073] bus voltage and frequency acquisition module, first target load unit removal module, second target load unit removal module;

[0074] The bus voltage and frequency acquisition module is used to collect the first voltage and first frequency of each high-voltage bus in the substation and the second voltage and second frequency of each low-voltage load unit in real time; wherein, the secondary voltage circuits corresponding to each high-voltage bus and each low-voltage load unit are connected to the low-frequency and low-voltage load reduction device;

[0075] The above-mentioned first target load unit cutting module is used to compare the above-mentioned first frequency of each of the above-mentioned high-voltage busbars with the preset low-frequency action value to determine whether the low-frequency load shedding function action conditions are met; if the above-mentioned first frequency of any of the above-mentioned high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function will be activated, the affected first target load unit will be determined, and the above-mentioned first target load unit will be cut off according to the preset load unit cutting priority; wherein, the above-mentioned first target load unit is: from the preset time value before the above-mentioned low-frequency load shedding function action moment to the above-mentioned low-frequency load shedding function action moment, the above-mentioned second frequency is continuously lower than the preset load error prevention cutting frequency;

[0076] The above-mentioned second target load unit cutting module is used to compare the above-mentioned first voltage of each of the above-mentioned high-voltage busbars with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the above-mentioned first voltage of any of the above-mentioned high-voltage busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function will be activated, the affected second target load unit will be determined, and the above-mentioned second target load unit will be cut off according to the preset load unit cutting priority; wherein, the above-mentioned second target load unit is: from the preset time value before the above-mentioned low-voltage load shedding function action moment to the above-mentioned low-voltage load shedding function action moment, the above-mentioned second target load unit is: the load unit whose above-mentioned second voltage is continuously lower than the preset load error prevention cutting voltage.

[0077] In a preferred embodiment, it further comprises: a first target locking busbar locking module;

[0078] The above-mentioned first target locked bus determination module is used to obtain the first frequency reduction rate of each high-voltage level bus at the current moment; compare the above-mentioned first frequency reduction rate with the preset frequency reduction locking set value; use the high-voltage level bus whose first frequency reduction rate is greater than the above-mentioned preset frequency reduction locking set value as the first target locked bus, and lock the low-frequency load shedding function of the first target locked bus.

[0079] In another preferred embodiment, it further comprises: a second target locking busbar locking module;

[0080] The above-mentioned second target locking bus locking module is used to obtain the first voltage drop rate of each high-voltage level bus at the current moment; compare the above-mentioned first voltage drop rate with the preset voltage drop locking value; use the high-voltage level bus whose first voltage drop rate is greater than the above-mentioned preset voltage drop locking value as the second target locking bus, and lock the low-voltage load shedding function of the second target locking bus.

[0081] It should be noted that the device embodiment described above is merely illustrative, wherein the modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement it without paying any creative work. The above schematic diagram is merely an example of a frequency and voltage emergency control device that takes into account the state of the load unit, and does not constitute a limitation on a frequency and voltage emergency control device that takes into account the state of the load unit. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0082] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment.

[0083] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the frequency and voltage emergency control method considering the load unit status described in any embodiment of the present invention.

[0084] For example, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in the device.

[0085] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, or a cloud server. The device may include, but is not limited to, a processor and a memory;

[0086] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the device, connecting the various parts of the device using various interfaces and lines.

[0087] The above-mentioned memory can be used to store the above-mentioned computer programs and / or modules. The above-mentioned processor realizes various functions of the above-mentioned device by running or executing the computer programs and / or modules stored in the above-mentioned memory, and calling the data stored in the memory. The above-mentioned memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; in addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0088] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0089] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the frequency and voltage emergency control method considering the load unit state described in any embodiment of the present invention.

[0090] In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0091] Compared with the prior art, by implementing the above-mentioned embodiments of the present invention, it is possible to prevent the erroneous removal of a load unit without faults, thereby improving the adaptability and correctness of the low-frequency and low-voltage load reduction strategy.

[0092] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A frequency and voltage emergency control method considering load unit status, characterized in that: include: Real-time collection of the first voltage and first frequency of each high-voltage busbar in the substation, and the second voltage and second frequency of each low-voltage load unit; wherein the secondary voltage circuits corresponding to each high-voltage busbar and each low-voltage load unit are connected to a low-frequency and low-voltage load reduction device; Obtaining a first frequency drop rate of each high-voltage bus at the current moment; comparing the first frequency drop rate with a preset frequency drop blocking value; selecting a high-voltage bus whose first frequency drop rate is greater than the preset frequency drop blocking value as a first target blocking bus, and blocking the low-frequency load shedding function of the first target blocking bus; Compare the first frequency of each of the high-voltage busbars with a preset low-frequency action value to determine whether the low-frequency load shedding function action conditions are met; if the first frequency of any of the high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function is activated, and the affected first target load unit is determined, and the first target load unit is shelved according to the preset load unit shedding priority; wherein, the first target load unit is: a load unit whose second frequency is continuously lower than the preset load error prevention shedding frequency from the preset time value before the low-frequency load shedding function action moment to the low-frequency load shedding function action moment; Obtaining a first voltage drop rate of each high-voltage bus at the current moment; comparing the first voltage drop rate with a preset voltage drop blocking value; selecting a high-voltage bus whose first voltage drop rate is greater than the preset voltage drop blocking value as a second target blocking bus, and blocking the low-voltage load shedding function of the second target blocking bus; The first voltage of each of the high-voltage busbars is compared with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the first voltage of any of the high-voltage busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function is activated, the affected second target load unit is determined, and the second target load unit is cut off according to the preset load unit cut-off priority; wherein, the second target load unit is: from the preset time value before the low-voltage load shedding function action moment to the low-voltage load shedding function action moment, the second voltage is continuously lower than the preset load error prevention cut-off voltage of the load unit.

2. A frequency and voltage emergency control method considering load unit status according to claim 1, characterized in that: After the low-frequency load shedding function of the first target blocking bus is blocked, the method further includes: The low-frequency load shedding function of the first target blocked bus is blocked until the first frequency of the first target blocked bus returns to a normal range.

3. The frequency and voltage emergency control method considering the load unit status according to claim 1, characterized in that: After the low-voltage load shedding function of the second target blocking bus is blocked, the method further includes: The low-voltage load shedding function of the second target blocking bus is blocked until the first voltage of the second target blocking bus returns to a normal range.

4. A frequency and voltage emergency control device considering the load unit state, characterized in that: include: bus voltage and frequency acquisition module, first target load unit removal module, second target load unit removal module, first target blocking bus blocking module and second target blocking bus blocking module; The bus voltage and frequency acquisition module is used to collect the first voltage and first frequency of each high-voltage bus in the substation and the second voltage and second frequency of each low-voltage load unit in real time; wherein, the secondary voltage circuits corresponding to each high-voltage bus and each low-voltage load unit are connected to the low-frequency and low-voltage load reduction device; The first target locked bus locking module is used to obtain the first frequency drop rate of each high-voltage bus at the current moment; compare the first frequency drop rate with a preset frequency drop blocking value; select the high-voltage bus whose first frequency drop rate is greater than the preset frequency drop blocking value as the first target locked bus, and lock the low-frequency load shedding function of the first target locked bus; The first target load unit cutting module is used to compare the first frequency of each of the high-voltage busbars with a preset low-frequency action value to determine whether the low-frequency load shedding function action conditions are met; if the first frequency of any of the high-voltage busbars is lower than the preset low-frequency action value, and the delay reaches the preset low-frequency action delay value, the low-frequency load shedding function is activated, the affected first target load unit is determined, and the first target load unit is cut off according to the preset load unit cutting priority; wherein, the first target load unit is: from the preset time value before the low-frequency load shedding function action moment to the low-frequency load shedding function action moment, the second frequency of the load unit is continuously lower than the preset load error prevention cutting frequency; The second target locked bus locking module is used to obtain the first voltage drop rate of each high-voltage bus at the current moment; compare the first voltage drop rate with a preset voltage drop blocking value; select the high-voltage bus whose first voltage drop rate is greater than the preset voltage drop blocking value as the second target locked bus, and lock the low-voltage load shedding function of the second target locked bus; The second target load unit cutting module is used to compare the first voltage of each of the high-voltage busbars with the preset low-voltage action value to determine whether the low-voltage load shedding function action conditions are met; if the first voltage of any of the high-voltage busbars is lower than the preset low-voltage action value, and the delay reaches the preset low-voltage action delay value, the low-voltage load shedding function will be activated, the affected second target load unit will be determined, and the second target load unit will be cut off according to the preset load unit cutting priority; wherein, the second target load unit is: from the preset time value before the low-voltage load shedding function action moment to the low-voltage load shedding function action moment, the second voltage is continuously lower than the preset load error prevention cutting voltage of the load unit.

5. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method implements a frequency and voltage emergency control method considering the load unit state as described in any one of claims 1 to 3.

6. A storage medium, characterized in that The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the frequency and voltage emergency control method considering the load unit state according to any one of claims 1 to 3.

Images