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

Abstract

The invention discloses a load unit state-considered frequency voltage emergency control method, device and equipment and a storage medium, and the method comprises the steps: firstly collecting a first voltage and a first frequency of each high-voltage-level bus and a second voltage and a second frequency of each low-voltage-level load unit in a transformer substation in real time; if the first frequency of any high-voltage-level bus is lower than a preset low-frequency action fixed value and the delay reaches a preset low-frequency action delay fixed value, a low-frequency load shedding function acts, and a first target load unit is cut off according to a preset load unit cut-off priority; and if the first voltage of any high-voltage-level bus is lower than a preset low-voltage action constant value and the delay reaches a preset low-voltage action delay constant value, a low-voltage load shedding function acts, and a second target load unit is cut off according to a preset load unit cut-off priority. By implementing the invention, the fault-free load unit can be prevented from being cut off by mistake, and the adaptability and action correctness of a low-frequency and low-voltage load reduction 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 means to ensure the safe and stable operation of the power grid, low-frequency and low-voltage load reduction measures are widely used in power systems. When a power system fails and the system frequency or voltage drops to a predetermined value, it is often necessary to use secondary equipment such as low-frequency and low-voltage load reduction devices to quickly remove a certain amount of power loads in order to stabilize the power system.

[0003] In the prior art, by grouping and adjusting each section of the bus 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 bus in the group meets the strategy judgment condition of the group, the load units corresponding to each round in the bus in the group are directly cut off according to the action round setting of each load unit, resulting in the erroneous cutting off of load units that are not in the same power supply area as the bus in the group, and then 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, device, equipment and storage medium taking into account the state of the load unit, which can prevent the erroneous removal of the fault-free load unit 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 the state of a load unit, comprising:

[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 the above-mentioned each high-voltage busbar and the above-mentioned 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 grade buses is compared with the preset low-frequency action constant value to determine whether the action conditions of the low-frequency load shedding function are met; if the above-mentioned first frequency of any of the above-mentioned high-voltage grade buses is lower than the preset low-frequency action constant value, and the delay reaches the preset low-frequency action delay constant 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 during the time period from the preset time constant 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 setting 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 setting, and the delay reaches the preset low-voltage action delay setting, 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 setting 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 voltage is continuously lower than the preset load error prevention cut-off voltage of the load unit.

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

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

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

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

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

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

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

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

[0017] Furthermore, after the low-frequency load shedding function of the first target locking bus is locked, 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 is restored to a normal range.

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

[0020] The low-voltage load shedding function of the second target interlocking bus is interlocked until the first voltage of the second target interlocking 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 taking into account the state of a load unit, comprising:

[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 level buses with the preset low-frequency action constant 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 level buses is lower than the preset low-frequency action constant value, and the delay reaches the preset low-frequency action delay constant 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 cut off according to the preset load unit cutting priority; wherein, the above-mentioned first target load unit is: from the preset time constant 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 load unit;

[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 grade busbars with the preset low-voltage action setting value to determine whether the low-voltage load cutting 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 setting value, and the delay reaches the preset low-voltage action delay setting value, the low-voltage load cutting 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 setting value before the above-mentioned low-voltage load cutting function action moment to the above-mentioned low-voltage load cutting function action moment, the above-mentioned second voltage is continuously lower than the preset load error prevention cutting voltage of the load unit.

[0027] Further, 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; take 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] Further, 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 set value; use the high-voltage level bus whose first voltage drop rate is greater than the above-mentioned preset voltage drop locking set 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 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, 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, 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 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 a low-frequency and low-voltage load reduction device; then, the first frequency of each high-voltage bus is compared with a preset low-frequency action constant to determine whether the low-frequency load shedding function action conditions are met; if the first frequency of any of the high-voltage buses is lower than the preset low-frequency action constant, and the delay reaches the preset low-frequency action delay constant, 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 preset time before the action moment of the low-frequency load shedding function The load unit whose second frequency is continuously lower than the preset load error prevention cut-off frequency during the time period from the preset time value to the action moment of the above-mentioned low-frequency load shedding function; the above-mentioned first voltage of each of the above-mentioned high-voltage grade busbars is compared with the preset low-voltage action set value to determine whether the action conditions of the low-voltage load shedding function 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 set value, and the delay reaches the preset low-voltage action delay set 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: the load unit whose second voltage is continuously lower than the preset load error prevention cut-off voltage during the time period from the preset time value before the action moment of the above-mentioned low-voltage load shedding function to the action moment of the above-mentioned low-voltage load shedding function. Therefore, the present invention does not need to group the busbars, and adds a comparison condition for the frequency and voltage of the load unit with the preset low-frequency action setting and the preset low-voltage action setting, so that it can be determined according to the comparison result whether the load unit and the busbar where the 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 It is a flow chart of a frequency and voltage emergency control method considering the state of a load unit provided by an embodiment of the present invention.

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

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

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings 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.

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

[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 the above-mentioned each high-voltage busbar and the above-mentioned 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 level 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 above-mentioned high-voltage busbars with the preset low-frequency action setting to determine whether the low-frequency load shedding function action conditions are met; if the first frequency of any of the above-mentioned high-voltage busbars is lower than the preset low-frequency action setting, and the delay reaches the preset low-frequency action delay setting, 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: the load unit whose second frequency is continuously lower than the preset load error prevention shedding frequency from the preset time setting before the low-frequency load shedding function action moment to the low-frequency load shedding function action moment;

[0045] Indicatively, 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 high-voltage busbar "I mother" and "II mother" is lower than the preset low-frequency action setting, and the delay (the time when the first frequency is lower than the preset low-frequency action setting) reaches the preset low-frequency action delay setting, 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 shedding frequency from the preset time setting before the low-frequency load shedding function is activated to the time when the low-frequency load shedding function is activated, will be shelved 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] Indicatively, 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 2, 3 and 4 are currently determined as the first target load units, 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 level buses with a preset low-frequency action setting, the method further includes:

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

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

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

[0052] Indicatively, 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 level busbars that need to lock the low-frequency load shedding function are determined by comparing the first frequency reduction rate of each high-voltage level busbar with the preset frequency reduction locking value in advance.

[0054] In another preferred embodiment, after the low-frequency load shedding function of the first target blocking bus is blocked, 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 is restored to a normal range.

[0056] Indicatively, Figure 2 As shown, if "I mother" is the determined first target locked bus, the first frequency of "I mother" continues to be collected in real time. When the first frequency returns to the normal range, the low-frequency load shedding function of "I mother" is 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 grade busbars with the preset low-voltage action setting 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 setting, and the delay reaches the preset low-voltage action delay setting, 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 setting 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 voltage is continuously lower than the preset load error prevention cut-off voltage of the load unit.

[0059] Indicatively, Figure 2 As shown, if the first voltage of any one of the high-voltage busbars "I bus" and "II bus" is lower than the preset low-voltage action value, and the delay (the time when 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 starts to work. The load units whose second voltage is continuously lower than the preset load error prevention shedding voltage during the period from the preset time value before the low-voltage load shedding function is activated to 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 level buses with a preset low-voltage action value, the method further includes:

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

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

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

[0065] Indicatively, 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 a preset voltage drop lockout value in advance.

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

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

[0069] Indicatively, 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 grade busbar whose low voltage load shedding function is locked is determined.

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

[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 level buses with the preset low-frequency action constant 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 level buses is lower than the preset low-frequency action constant value, and the delay reaches the preset low-frequency action delay constant 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 cut off according to the preset load unit cutting priority; wherein, the above-mentioned first target load unit is: from the preset time constant 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 load unit;

[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 grade busbars with the preset low-voltage action setting value to determine whether the low-voltage load cutting 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 setting value, and the delay reaches the preset low-voltage action delay setting value, the low-voltage load cutting 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 setting value before the above-mentioned low-voltage load cutting function action moment to the above-mentioned low-voltage load cutting function action moment, the above-mentioned second voltage is continuously lower than the preset load error prevention cutting voltage of the load unit.

[0077] In a preferred embodiment, it further comprises: a first target locking bus 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; take 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 bus 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 set value; use the high-voltage level bus whose first voltage drop rate is greater than the above-mentioned preset voltage drop locking set 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 embodiments described above are merely schematic, 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 scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments 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 creative labor. The above schematic diagram is only an example of a frequency voltage emergency control device that takes into account the state of a load unit, and does not constitute a limitation on a frequency voltage emergency control device that takes into account the state of a load unit, and 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 item embodiments, the present invention provides corresponding terminal device item embodiments.

[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, and when the processor executes the computer program, it implements a frequency and voltage emergency control method considering the load unit state described in any embodiment of the present invention.

[0084] Exemplarily, 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 implementing specific functions, which 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, a PDA, a cloud server, etc. The device may include, but is not limited to, a processor, a memory;

[0086] The processor referred to herein 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) or 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, etc. The above-mentioned processor is the control center of the above-mentioned device, and uses various interfaces and lines to connect various parts of the entire device;

[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 devices.

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

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

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

[0091] Compared with the prior art, by implementing the above-mentioned embodiments of the present invention, it is possible to prevent the load unit without fault from being mistakenly cut off, and improve 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 principle 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 the load unit state, 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; Compare the first frequency of each of the 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 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 sheared off according to the preset load unit shedding priority; wherein, the first target load unit is: the 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; The first voltage of each of the high-voltage grade busbars is compared with the preset low-voltage action setting to determine whether the low-voltage load shedding function action conditions are met; if the first voltage of any of the high-voltage grade busbars is lower than the preset low-voltage action setting, and the delay reaches the preset low-voltage action delay setting, 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: a load unit whose second voltage is continuously lower than the preset load error prevention cut-off voltage from the preset time setting before the low-voltage load shedding function action moment to the low-voltage load shedding function action moment.

2. A frequency and voltage emergency control method considering load unit status according to claim 1, characterized in that: Before comparing the first frequency of each of the high-voltage level buses with a preset low-frequency action setting, the method further includes: Obtain the first frequency drop rate of each high-voltage level bus at the current moment; Comparing the first frequency reduction rate with a preset frequency reduction locking value; 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.

3. A frequency and voltage emergency control method considering load unit status according to claim 1, characterized in that: Before comparing the first voltage of each of the high-voltage level buses with a preset low-voltage action set value, the method further includes: Obtain the first voltage drop rate of each high voltage level bus at the current moment; comparing the first voltage drop rate with a preset voltage drop lock value; The high-voltage bus whose first voltage drop rate is greater than the preset voltage drop locking value is used as the second target locking bus, and the low-voltage load shedding function of the second target locking bus is locked.

4. A frequency and voltage emergency control method considering load unit status according to claim 2, 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 locked bus is locked until the first frequency of the first target locked bus returns to a normal range.

5. A frequency and voltage emergency control method considering load unit status according to claim 3, 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 locked bus is locked until the first voltage of the second target locked bus returns to a normal range.

6. 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; 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 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 load unit cutting module is used to compare the first voltage of each of the high-voltage level busbars with a 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 level 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 cutting priority; wherein, the second target load unit is: a load unit whose second voltage is continuously lower than the preset load error prevention cutting voltage from the preset time value before the low-voltage load shedding function action moment to the low-voltage load shedding function action moment.

7. A frequency and voltage emergency control device considering the load unit state according to claim 6, characterized in that: Also includes: The first target interlock bus interlock module; The 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 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 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.

8. A frequency and voltage emergency control device considering the load unit state according to claim 7, characterized in that: Also includes: The second target interlock bus interlock module; The 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; The first voltage drop rate is compared with a preset voltage drop locking value; a high-voltage bus whose first voltage drop rate is greater than the preset voltage drop locking value is used as a second target locking bus, and a low-voltage load shedding function of the second target locking bus is locked.

9. A terminal device, characterized in that: It 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, a frequency and voltage emergency control method considering the state of a load unit as described in any one of claims 1 to 5 is implemented.

10. 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 a frequency and voltage emergency control method considering the state of a load unit as described in any one of claims 1 to 5.

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