Reactive compensation method and system and electronic equipment

Abstract

The invention discloses a reactive compensation method and system and electronic equipment, and the method comprises the steps: calculating the actual capacity of a parallel capacitor based on a power model according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the voltage of a power grid, and the reactance rate of a reactor connected in series with the parallel capacitor, the power model is determined based on a power triangle and data in a preset database; detecting power grid three-phase voltage, power grid three-phase current and reactive power; judging whether the three-phase current of the power grid is normal or not to obtain a first judgment result; judging whether the working temperature of the component of the reactive power compensation device exceeds a temperature threshold value or not to obtain a second judgment result; and switching the parallel capacitor based on a neural network algorithm according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result, and performing reactive compensation.

Description

Technical Field

[0001] The embodiments of the present specification relate to the field of electrical automation technology, and in particular to a reactive power compensation method, system and electronic equipment. Background Art

[0002] With the development of society and the advancement of science and technology, as well as the rapid development of new energy, distributed power generation, and smart microgrids, the demand for electric energy is increasing day by day. The network form and functional role of the distribution network are gradually changing, and the distribution network is showing an increasingly complex "multi-source" feature. In order to meet the needs of production and life, it is becoming increasingly important to improve the power quality of the power supply and distribution system. With the massive power electronic transformers, heavy industrial power equipment, power electronic loads, and new energy power generation equipment connected to the distribution network, the voltage deviation pollution caused by the harmonic current and reactive power loss of the distribution network has shown the characteristics of decentralization and full network.

[0003] Reactive power compensation, also known as reactive power compensation, is a technology that improves the power factor of the power grid, reduces the loss of power transformers and transmission lines, improves power supply efficiency, and improves the power supply environment in the power supply system. It can be said that reactive power compensation devices are essential high-power devices in power supply systems.

[0004] Common methods for improving power quality include harmonic control and control of voltage fluctuations and flickers. The methods for preventing harmonics in harmonic control mainly include: using rectifiers with multiple pulses, changing the connection method of transformers, and adopting rotating motor designs that reduce harmonic magnetic potential. The control of voltage fluctuations and flickers is carried out by improving power supply capacity and installing compensation equipment. The installation of compensation equipment includes installing reactive power compensators and reactive power generators, and performing corresponding compensation through reactive power compensators and reactive power generators to improve the power factor of the power grid. Summary of the invention

[0005] In view of this, the embodiments of the present specification provide a reactive power compensation method, system and electronic device, which are used to solve the problems of low efficiency and inaccurate compensation results of reactive power compensation methods in the prior art.

[0006] The embodiments of this specification adopt the following technical solutions: This embodiment of the present specification provides a reactive power compensation method, the method comprising: According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database; Detect the three-phase voltage, three-phase current and reactive power of the power grid; Determine whether the three-phase current of the power grid is normal, and obtain a first determination result; Determine whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtain a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a shunt capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the shunt capacitor is -5°C-45°C; Based on a neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result, the parallel capacitor is switched to perform reactive compensation.

[0007] The embodiment of this specification also provides a reactive power compensation system, the system comprising: A calculation module, which calculates the actual capacity of the parallel capacitor based on a power model according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage, and the reactance rate of the reactor connected in series with the parallel capacitor, wherein the power model is determined based on the power triangle and the data in the preset database; Detection module, detecting the three-phase voltage, three-phase current and reactive power of the power grid; A first judgment module is used to judge whether the three-phase current of the power grid is normal, and obtain a first judgment result; A second judgment module is configured to judge whether the operating temperature of a component of the reactive power compensation device exceeds a temperature threshold, and obtain a second judgment result, wherein the component of the reactive power compensation device includes at least one of the following: a parallel capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the parallel capacitor is -5°C to 45°C; The compensation module switches the parallel capacitor based on the neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result to perform reactive compensation.

[0008] The embodiment of the present specification also provides an electronic device, including at least one processor and a memory, wherein the memory stores a program and is configured such that the at least one processor executes the following steps: According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database; Detect the three-phase voltage, three-phase current and reactive power of the power grid; Determine whether the three-phase current of the power grid is normal, and obtain a first determination result; Determine whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtain a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a shunt capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the shunt capacitor is -5°C-45°C; Based on a neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result, the parallel capacitor is switched to perform reactive compensation.

[0009] At least one of the above technical solutions adopted in the embodiments of this specification can achieve the following beneficial effects: According to the pre-recorded rated capacity of each parallel capacitor, the real-time collected grid voltage and the pre-recorded rated voltage of each parallel capacitor, the actual capacity of each parallel capacitor is accurately calculated through the power model determined based on the power triangle and the data in the preset database. Then, based on the neural network algorithm, the parallel capacitor can be accurately switched to achieve accurate reactive power compensation.

[0010] In addition, based on whether the three-phase current and three-phase voltage of the three-phase power grid are normal and whether the operating temperature of the components involved in reactive power compensation is normal, the parallel capacitors are switched on and off to perform reactive power compensation.

[0011] In this way, before the reactive compensation operation is performed, the influence of temperature on the intelligent reactive compensator during reactive compensation can be reduced, thereby further improving the accuracy of the reactive compensation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the embodiments of this specification and constitute a part of the embodiments of this specification. The illustrative embodiments of this specification and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings: Figure 1 A schematic diagram of the logical architecture of a reactive power compensation system provided in an embodiment of this specification; Figure 2 A schematic diagram of the structure of a temperature measuring unit provided in an embodiment of this specification; Figure 3 A flowchart of a reactive power compensation method provided in an embodiment of this specification; Figure 4 A specific structural diagram of a reactive power compensation system provided in an embodiment of this specification; Figure 5 The embodiments of this specification provide corresponding to Figure 3 A structural schematic diagram of a reactive power compensation device. DETAILED DESCRIPTION

[0013] Generally speaking, the traditional distributed power management method processes data centrally at the distribution network master station. Due to the frequent changes in the access status of the power electronic equipment in the distribution network, it is difficult to update the data of the voltage deviation and reactive power compensation of the distribution network in the distribution network information system in a timely manner, which makes it difficult for the distribution network master station to carry out real-time regulation of the distribution network harmonic suppression and reactive power compensation.

[0014] In addition, the reactive power compensation controller generally multiplies the rated capacity of the parallel capacitor by a fixed coefficient set based on human experience as an estimate of the actual capacity of the parallel capacitor. The estimation accuracy is low, so accurate reactive power compensation cannot be achieved.

[0015] Therefore, the embodiments of the present specification provide a reactive power compensation method, system and electronic device, which can accurately calculate the actual capacity of each parallel capacitor based on the pre-recorded rated capacity of each parallel capacitor, the real-time collected grid voltage and the pre-recorded rated voltage of each parallel capacitor through a reactive power compensation controller based on the power triangle and the power model determined by the data in the preset database, and then accurately switch the parallel capacitors based on the neural network algorithm to achieve accurate reactive power compensation.

[0016] In addition, based on whether the three-phase current and three-phase voltage of the three-phase power grid are normal and whether the operating temperature of the components involved in reactive power compensation is normal, the parallel capacitors are switched on and off to perform reactive power compensation.

[0017] In this way, before the reactive compensation operation is performed, the influence of temperature on the intelligent reactive compensator during reactive compensation can be reduced, thereby further improving the accuracy of the reactive compensation operation.

[0018] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution of this application will be clearly and completely described below in conjunction with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1 , which is a schematic diagram of the logical architecture of a reactive power compensation system provided in an embodiment of this specification.

[0021] The reactive power compensation system may specifically include: A control unit, the control unit being used to control the power compensation unit to compensate the three-phase circuit according to the received current value and voltage value; A power conversion unit, the power conversion unit is used to detect the voltage value and the current value in the three-phase circuit, and transmit the detected voltage value and current value to the control unit; A power compensation unit, the power compensation unit is used to compensate the three-phase circuit according to the instruction of the control unit; A temperature measuring unit is used to detect the temperature of components involved in reactive power compensation to obtain an operating temperature, and to determine whether the operating temperature exceeds a temperature threshold. If the temperature threshold is exceeded, temperature protection is performed on the components to reduce the impact of temperature on reactive power compensation in a three-phase circuit.

[0022] In actual application, the control unit may specifically include a single-chip microcomputer and a DSP data signal processing module. The DSP data signal processing module is connected to the hardware circuit of the single-chip microcomputer, and the single-chip microcomputer is also connected to a storage module, an RS485 serial port, a button, and an LCD.

[0023] The DSP data signal processing module may be specifically a DSP TMS320C6713, and the single-chip microcomputer may be specifically a STM32f103VE single-chip microcomputer, which are not specifically limited here.

[0024] In the embodiments of this specification, Figure 2 Shown is a schematic structural diagram of the temperature measuring unit.

[0025] The temperature measuring unit may specifically include: A positioning module, used for positioning components involved in reactive power compensation of a three-phase circuit, wherein the components involved in reactive power compensation of a three-phase circuit include at least one of the following: a shunt capacitor, a reactor, and a switching switch; A temperature measurement module is used to detect the temperature of the located components to obtain the operating temperature; A temperature protection module, used to determine whether the acquired operating temperature exceeds a temperature threshold, and when the operating temperature exceeds the temperature threshold, temperature protection is performed on the component; A composite protection module is used to perform composite protection on components during reactive power compensation of a three-phase circuit, wherein the composite protection may specifically include short circuit protection, three-phase unbalance protection, etc., which are not specifically limited here; The early warning module is used to obtain the temperature rise trend of the component according to the component temperature rise model when performing reactive power compensation, and to issue an alarm when the temperature rise trend of the component reaches a threshold value to remind the staff to discover circuit problems in time to avoid causing greater losses.

[0026] In the embodiment of this specification, the positioning module positions the components involved in reactive power compensation based on the reactive power compensation type.

[0027] Among them, in specific application scenarios, compensation types include low-voltage on-site reactive compensation, low-voltage centralized, distributed reactive compensation, and medium-voltage centralized reactive compensation, which are not specifically limited here.

[0028] Specifically, the low-voltage on-site reactive compensation can also be called on-site compensation, which is to connect the low-voltage capacitor in parallel with the motor, and switch on and off the motor at the same time through the control and protection device. The low-voltage on-site reactive compensation is suitable for compensating the reactive consumption of the motor, mainly for compensating the excitation reactive power. In other embodiments, according to the reactive power generation of the specific electrical equipment, a single or multiple low-voltage capacitor groups are connected in parallel with the electrical equipment, and the reactive power of the inductive equipment is absorbed by the capacitor, and converted into active energy and fed back to the inductive equipment.

[0029] Low-voltage concentration and reactive power compensation can be connected to one side of the low-voltage busbar of the distribution transformer through a low-voltage switch. The reactive power compensation switching device can be used as a control and protection device to directly control the switching of the capacitor according to the reactive load on the low-voltage busbar.

[0030] Medium-voltage centralized reactive power compensation is a compensation method that directly installs parallel capacitor groups on the medium-voltage busbar of the substation. Medium-voltage centralized reactive power compensation is suitable for users' principle substations or at the end of power supply lines. It can reduce the reactive power consumption of the power system and play a compensation role. It can automatically switch according to the size of the load, thereby improving the user's power factor. The power factor refers to the ratio of active power to apparent power in an AC circuit. The higher the power factor, the higher the operating efficiency of the power generation equipment.

[0031] In the embodiments of this specification, the components for reactive power compensation may specifically include a plurality of different intelligent composite switches arranged in the reactive power compensation location and components such as capacitors and reactors corresponding to the intelligent composite switches, without specific limitation herein, wherein the reactor is used to increase the inductive reactive power to balance the excess capacitive reactive power of the power system.

[0032] In the embodiments of this specification, the temperature measurement module may include multiple temperature sensors and may perform temperature measurement on multiple components at the same time.

[0033] When performing reactive power compensation in a three-phase circuit, components such as capacitors and reactors will heat up due to long operating time, overvoltage and overcurrent operation, and large system harmonics. When the temperature is too high, it is more likely to burn out. Therefore, temperature protection should be performed according to the temperature after measuring the operating temperature.

[0034] Specifically, the temperature protection module may include a temperature range setting submodule and a temperature protection submodule, wherein the temperature range setting submodule may be used to set a safe temperature range, a protection temperature range and a circuit breaker protection range of the protection component.

[0035] The safe temperature range is set according to the model of the capacitor or the model of the reactor. The capacitor and the reactor can work normally within the safe temperature range. For example, the safe temperature range of the capacitor in the reactive power compensation component is -5℃-45℃.

[0036] The protection temperature range is the range in which temperature problems need to be alerted. When in this temperature range, the component can still perform reactive power compensation, but the working efficiency has been affected. For example, when performing reactive power compensation to the required power factor, the component heats up to the protection temperature range, and the compensated reactive power changes from 120kvar to 95kvar. At this time, an alert is required to protect the component.

[0037] The circuit breaker protection range is the temperature range in which circuit breaker measures need to be taken immediately to protect the components. When the temperature is within this range for a long time, the reactive compensation components are in danger of burning out. For example, when the capacitor is in the circuit breaker protection range, the capacitor may bulge and other dangers.

[0038] In another application embodiment of the present specification, the composite protection is a module that protects components according to different working scenarios. Since the reactive compensation device can operate in different links of the circuit, it not only involves the problem of temperature protection, but also involves the problem of the components themselves being affected by the environment.

[0039] Among them, short-circuit protection is used to protect capacitors and reactors when a short circuit occurs. Among them, when a short circuit occurs, the current emitted by the reactive compensation components will increase instantly, so the short-circuit protection can be set to automatically disconnect the circuit to physically cut off the connection between the component and the line, and cut off the connection between the upper-level power grid and the lower-level electrical equipment of the corresponding component, reducing the impact of the short circuit on the component while reducing the impact on the electrical equipment running on the line.

[0040] The three-phase unbalance protection unit is used to protect capacitors and reactors when three-phase imbalance occurs. Among them, three-phase imbalance refers to the phenomenon that the amplitudes of the three-phase current (or voltage) in the power system are inconsistent and the amplitude difference exceeds the specified range. The three-phase imbalance of the power system is caused by the unbalanced operation of the three-phase load such as the motor and the asymmetry of the three-phase parameters of the system components. When three-phase imbalance occurs, it is necessary to set reactive compensation components such as capacitors for automatic adjustment. When three-phase imbalance occurs, the capacitor performs reactive compensation work and the capacitor needs to be protected.

[0041] like Figure 3 As shown, it is a flow chart of a reactive power compensation method provided in an embodiment of this specification.

[0042] Specifically, the reactive power compensation method may include the following steps: S301: Calculate the actual capacity of the parallel capacitor based on a power model according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage, and the reactance rate of the reactor connected in series with the parallel capacitor, wherein the power model is determined based on the power triangle and data in a preset database; S303: Detecting the three-phase voltage, three-phase current and reactive power of the power grid; S305: Determine whether the three-phase current of the power grid is normal, and obtain a first determination result; S307: Determine whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtain a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a shunt capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the shunt capacitor is -5°C-45°C; S309: Switching on and off the parallel capacitors to perform reactive power compensation based on a neural network algorithm and according to the actual capacity of the parallel capacitors, the first judgment result and the second judgment result. The neural network algorithm includes a BP neural network algorithm, a radial basis function (RBF) neural network algorithm or a convolutional neural network algorithm.

[0043] In the embodiments of this specification, the reactive power compensation device includes a parallel compensation capacitor group, which refers to a combination of all parallel capacitors connected in parallel to the power supply system. The individual parallel capacitors referred to in the embodiments of this specification are the individual parallel capacitors in the parallel compensation capacitor group. The actual capacity of the parallel capacitor refers to the capacity actually output after the parallel capacitor is put into use.

[0044] In order to ensure the long-term safe operation of each parallel capacitor, the rated voltage of each parallel capacitor used in the reactive power compensation device will be greater than the grid voltage, which results in the actual capacity of each parallel capacitor not reaching its rated capacity. In addition, the rated voltage of each parallel capacitor used in the reactive power compensation device is not necessarily completely consistent. Under the actual grid voltage, the actual capacity of parallel capacitors with different rated voltages is different.

[0045] For step S301, according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage, and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database, and specifically may include: Obtaining the rated voltage of each parallel capacitor, the rated capacity of each parallel capacitor, and the reactance ratio of the reactor connected in series to each parallel capacitor, which are pre-entered into the reactive power compensation device; According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database. In other words, the power model can be trained based on the power triangle principle and the massive data in the preset database, so as to determine the final power model with high calculation accuracy.

[0046] The rated voltage and rated capacity of the capacitor are one of the nominal parameters on the capacitor nameplate and are known quantities. The embodiment of this specification pre-enters the rated capacity and rated voltage of each parallel capacitor, and then the reactive power compensation controller can accurately calculate the actual capacity of each parallel capacitor based on the power model according to the pre-entered rated capacity of each parallel capacitor, the real-time collected grid voltage, and the pre-entered rated voltage of each parallel capacitor. Then, the neural network algorithm can accurately switch the parallel capacitors according to the actual capacity of each parallel capacitor currently calculated, so as to achieve accurate reactive power compensation effect.

[0047] Furthermore, for parallel capacitors with the same rated capacity, after the user enters the rated capacity of one of the parallel capacitors, the rated capacities of all the remaining parallel capacitors are generated at one time in response to a copy and paste command issued by the user.

[0048] As an embodiment of this specification, for the step S305, judging whether the three-phase current of the power grid is normal and obtaining a first judgment result may specifically include: If the first judgment result is that the three-phase current of the power grid is abnormal, a neural network algorithm is used to determine whether to modify the switching state of the parallel capacitor.

[0049] Further, for step S307, determining whether the operating temperature of a component of the reactive power compensation device exceeds a temperature threshold to obtain a second determination result may specifically include: Locate the components involved in reactive power compensation of three-phase circuits; Conduct temperature detection on the located components to obtain the operating temperature; Determine whether the obtained operating temperature exceeds the temperature threshold.

[0050] Further, if the second judgment result is that the operating temperature exceeds the temperature threshold, temperature protection is performed on the component; If the second judgment result is that the operating temperature does not exceed the temperature threshold, a neural network algorithm is used to determine whether to modify the switching state of the parallel capacitor.

[0051] As another application embodiment, before deciding whether to modify the switching state of the parallel capacitor, the following may also be included: Composite protection is performed on components involved in reactive power compensation of three-phase circuits, and the composite protection may specifically include short-circuit protection and three-phase unbalance protection.

[0052] A reactive power compensation method provided in an embodiment of the present specification allows a reactive power compensation controller to accurately calculate the actual capacity of each parallel capacitor based on a power model according to the pre-recorded rated capacity of each parallel capacitor, the real-time collected grid voltage, and the pre-recorded rated voltage of each parallel capacitor. Then, a neural network algorithm can be used to accurately switch the parallel capacitors to achieve accurate reactive power compensation.

[0053] In addition, based on whether the three-phase current and three-phase voltage of the three-phase power grid are normal and whether the operating temperature of the components involved in reactive power compensation is normal, the parallel capacitors are switched on and off to perform reactive power compensation.

[0054] In this way, before the reactive compensation operation is performed, the influence of temperature on the intelligent reactive compensator during reactive compensation can be reduced, thereby further improving the accuracy of the reactive compensation operation.

[0055] It should be noted that the above-mentioned specific reactive power compensation method is only used as a specific application embodiment, and does not limit the scope of the embodiments of this specification. It can also include other specific embodiments, which will not be described one by one here.

[0056] Based on the same inventive concept, the embodiments of this specification also provide a system corresponding to the above method. Figure 4 A specific structural diagram of a reactive power compensation system provided in an embodiment of this specification.

[0057] like Figure 4 As shown, the reactive power compensation system may specifically include: A calculation module 401 calculates the actual capacity of the parallel capacitor based on a power model according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage, and the reactance rate of the reactor connected in series with the parallel capacitor, wherein the power model is determined based on the power triangle and the data in the preset database; A detection module 402 detects the three-phase voltage, the three-phase current and the reactive power of the power grid; A first judgment module 403 is used to judge whether the three-phase current of the power grid is normal, and obtain a first judgment result; The second judgment module 404 judges whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtains a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a parallel capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the parallel capacitor is -5°C-45°C; The compensation module 405 switches the parallel capacitor according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result based on a neural network algorithm to perform reactive power compensation. The neural network algorithm includes a BP neural network algorithm, a radial basis function (RBF) neural network algorithm or a convolutional neural network algorithm.

[0058] Based on the system of FIG. 4 , the examples of this specification also provide some specific implementation plans of the system, which are described below.

[0059] Optionally, the reactive power compensation device includes a parallel compensation capacitor group, which refers to a combination of all parallel capacitors connected in parallel to the power supply system. The individual parallel capacitors referred to in the embodiments of this specification are the individual parallel capacitors in the parallel compensation capacitor group. The actual capacity of the parallel capacitor refers to the capacity actually output after the parallel capacitor is put into use.

[0060] In order to ensure the long-term safe operation of each parallel capacitor, the rated voltage of each parallel capacitor used in the reactive power compensation device will be greater than the grid voltage, which results in the actual capacity of each parallel capacitor not reaching its rated capacity. In addition, the rated voltage of each parallel capacitor used in the reactive power compensation device is not necessarily completely consistent. Under the actual grid voltage, the actual capacity of parallel capacitors with different rated voltages is different.

[0061] Optionally, the actual capacity of the parallel capacitor is calculated based on a power model according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage, and the reactance rate of the reactor connected in series with the parallel capacitor, wherein the power model is determined based on the power triangle and the data in the preset database, and specifically may include: Obtaining the rated voltage of each parallel capacitor, the rated capacity of each parallel capacitor, and the reactance ratio of the reactor connected in series to each parallel capacitor, which are pre-entered into the reactive power compensation device; According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database.

[0062] The rated voltage and rated capacity of the capacitor are one of the nominal parameters on the capacitor nameplate and are known quantities. The embodiment of this specification pre-enters the rated capacity and rated voltage of each parallel capacitor, and then the reactive power compensation controller can accurately calculate the actual capacity of each parallel capacitor based on the power model according to the pre-entered rated capacity of each parallel capacitor, the real-time collected grid voltage, and the pre-entered rated voltage of each parallel capacitor. Then, the neural network algorithm can accurately switch the parallel capacitors according to the actual capacity of each parallel capacitor currently calculated, so as to achieve accurate reactive power compensation effect.

[0063] Optionally, for parallel capacitors with the same rated capacity, after the user enters the rated capacity of one of the parallel capacitors, the rated capacities of all the remaining parallel capacitors are generated at one time in response to a copy and paste command issued by the user.

[0064] Optionally, determining whether the three-phase current of the power grid is normal to obtain a first determination result may specifically include: If the first judgment result is that the three-phase current of the power grid is abnormal, a neural network algorithm is used to determine whether to modify the switching state of the parallel capacitor.

[0065] Optionally, determining whether the operating temperature of a component of the reactive power compensation device exceeds a temperature threshold to obtain a second determination result may specifically include: Locate the components involved in reactive power compensation of three-phase circuits; Conduct temperature detection on the located components to obtain the operating temperature; It is determined whether the obtained operating temperature exceeds a temperature threshold, wherein the safety temperature threshold range of the parallel capacitor is -5°C-45°C.

[0066] Optionally, if the second judgment result is that the operating temperature exceeds the temperature threshold, temperature protection is performed on the component; If the second judgment result is that the operating temperature does not exceed the temperature threshold, a neural network algorithm is used to determine whether to modify the switching state of the parallel capacitor.

[0067] Optionally, before deciding whether to modify the switching state of the parallel capacitor, the following steps may also be included: Composite protection is performed on components involved in reactive power compensation of three-phase circuits, and the composite protection may specifically include short-circuit protection and three-phase unbalance protection.

[0068] A reactive power compensation system provided in an embodiment of the present specification allows a reactive power compensation controller to accurately calculate the actual capacity of each parallel capacitor based on a power model according to the pre-recorded rated capacity of each parallel capacitor, the real-time collected grid voltage, and the pre-recorded rated voltage of each parallel capacitor. Then, a neural network algorithm can be used to accurately switch the parallel capacitors to achieve accurate reactive power compensation.

[0069] In addition, based on whether the three-phase current and three-phase voltage of the three-phase power grid are normal and whether the operating temperature of the components involved in reactive power compensation is normal, the parallel capacitors are switched on and off to perform reactive power compensation.

[0070] In this way, before the reactive compensation operation is performed, the influence of temperature on the intelligent reactive compensator during reactive compensation can be reduced, thereby further improving the accuracy of the reactive compensation operation.

[0071] Based on the same inventive concept, the embodiments of this specification also provide an electronic device corresponding to the above method.

[0072] Figure 5 The embodiments of this specification provide corresponding to Figure 3 A schematic diagram of the structure of a reactive power compensation device. Figure 5 As shown, the device 500 may include: at least one processor 510; and, A memory 530 in communication with the at least one processor; wherein, The memory 530 stores instructions 520 executable by the at least one processor 510. The instructions are executed by the at least one processor 510 to enable the at least one processor 510 to: According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database; Detect the three-phase voltage, three-phase current and reactive power of the power grid; Determine whether the three-phase current of the power grid is normal, and obtain a first determination result; Determine whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtain a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a shunt capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the shunt capacitor is -5°C-45°C; Based on a neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result, the parallel capacitor is switched to perform reactive compensation.

[0073] Among them, other functions of the processor can also refer to the contents recorded in the above embodiments, which will not be repeated here.

[0074] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. Figure 5 As for the device shown, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0075] In the 1990s, it was very clear whether the improvement of a technology was hardware improvement (for example, improvement of the circuit structure of diodes, transistors, switches, etc.) or software improvement (for example, improvement of the method flow). However, with the development of technology, many improvements of the method flow today can be regarded as direct improvements of the hardware circuit structure. Designers almost always obtain the corresponding hardware circuit structure by programming the improved method flow into the hardware circuit. Therefore, it cannot be said that the improvement of a method flow cannot be implemented with a hardware entity module. For example, a programmable logic device (PLD) (for example, a field programmable gate array (FPGA)) is such an integrated circuit whose logical function is determined by the user programming the device. Designers can "integrate" a digital system on a PLD by programming it themselves, without having to ask chip manufacturers to design and make dedicated integrated circuit chips. Moreover, nowadays, instead of manually making integrated circuit chips, this kind of programming is mostly implemented by "logic compiler" software, which is similar to the software compiler used when developing and writing programs, and the original code before compilation must also be written in a specific programming language, which is called hardware description language (HDL). There is not only one kind of HDL, but many kinds, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, RHDL (Ruby Hardware Description Language), etc. The most commonly used ones are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also know that it is only necessary to program the method flow slightly in the above-mentioned hardware description languages ​​and program it into the integrated circuit, and then it is easy to obtain the hardware circuit that implements the logic method flow.

[0076] The controller may be implemented in any suitable manner, for example, the controller may take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (e.g., software or firmware) executable by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include but are not limited to the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, and the memory controller may also be implemented as part of the control logic of the memory. It is also known to those skilled in the art that, in addition to implementing the controller in a purely computer-readable program code manner, the controller may be implemented in the form of a logic gate, a switch, an application-specific integrated circuit, a programmable logic controller, and an embedded microcontroller by logically programming the method steps. Therefore, such a controller may be considered as a hardware component, and the devices for implementing various functions included therein may also be considered as structures within the hardware component. Or even, the devices for implementing various functions may be considered as both software modules for implementing the method and structures within the hardware component.

[0077] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0078] For the convenience of description, the above device is described in terms of functions and is described separately in various units. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0079] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0080] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0084] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0085] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0086] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0087] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0088] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0089] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A reactive power compensation method, characterized in that: The method comprises: According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database; Detect the three-phase voltage, three-phase current and reactive power of the power grid; Determine whether the three-phase current of the power grid is normal, and obtain a first determination result; Determine whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtain a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a shunt capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the shunt capacitor is -5°C-45°C; Based on a neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result, the parallel capacitor is switched to perform reactive compensation.

2. The method according to claim 1, characterized in that According to the rated voltage and rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, including: Obtaining the rated voltage of each parallel capacitor, the rated capacity of each parallel capacitor, and the reactance ratio of the reactor connected in series to each parallel capacitor, which are pre-entered into the reactive power compensation device; According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database.

3. The method according to claim 2, characterized in that The rated voltage and rated capacity of a capacitor are one of the nominal parameters on the capacitor nameplate.

4. The method according to claim 2, characterized in that For parallel capacitors with the same rated capacity, after the user enters the rated capacity of one of the parallel capacitors, the rated capacities of all the remaining parallel capacitors are generated at one time in response to a copy and paste command issued by the user.

5. The method according to claim 1, characterized in that Determining whether the three-phase current of the power grid is normal to obtain a first determination result includes: If the first judgment result is that the three-phase current of the power grid is abnormal, a neural network algorithm is used to determine whether to modify the switching state of the parallel capacitor.

6. The method according to claim 1, characterized in that Determining whether the operating temperature of a component of the reactive power compensation device exceeds a temperature threshold to obtain a second determination result includes: Locate the components involved in reactive power compensation of three-phase circuits; Conduct temperature detection on the located components to obtain the operating temperature; It is determined whether the obtained operating temperature exceeds a temperature threshold, wherein the safety temperature threshold range of the parallel capacitor is -5°C-45°C.

7. The method according to claim 6, characterized in that If the second judgment result is that the operating temperature exceeds the temperature threshold, temperature protection is performed on the component; If the second judgment result is that the operating temperature does not exceed the temperature threshold, the neural network algorithm is used to determine whether to modify the switching state of the parallel capacitor, wherein the neural network algorithm includes a BP neural network algorithm, a radial basis function (RBF) neural network algorithm or a convolutional neural network algorithm.

8. The method according to claim 1, characterized in that Before deciding whether to modify the switching state of the parallel capacitor, it also includes: Composite protection is performed on components involved in reactive power compensation of three-phase circuits, and the composite protection may specifically include short-circuit protection and three-phase unbalance protection.

9. A reactive power compensation system, characterized in that: The system comprises: A calculation module, which calculates the actual capacity of the parallel capacitor based on a power model according to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage, and the reactance rate of the reactor connected in series with the parallel capacitor, wherein the power model is determined based on the power triangle and the data in the preset database; Detection module, detecting the three-phase voltage, three-phase current and reactive power of the power grid; A first judgment module is used to judge whether the three-phase current of the power grid is normal, and obtain a first judgment result; A second judgment module is configured to judge whether the operating temperature of a component of the reactive power compensation device exceeds a temperature threshold, and obtain a second judgment result, wherein the component of the reactive power compensation device includes at least one of the following: a parallel capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the parallel capacitor is -5°C to 45°C; The compensation module switches the parallel capacitor based on the neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result to perform reactive compensation.

10. An electronic device, characterized in that: The system comprises at least one processor and a memory, wherein the memory stores a program and is configured such that the at least one processor executes the following steps: According to the rated voltage of the parallel capacitor, the rated capacity of the parallel capacitor, the grid voltage and the reactance rate of the reactor connected in series with the parallel capacitor, the actual capacity of the parallel capacitor is calculated based on the power model, wherein the power model is determined based on the power triangle and the data in the preset database; Detect the three-phase voltage, three-phase current and reactive power of the power grid; Determine whether the three-phase current of the power grid is normal, and obtain a first determination result; Determine whether the operating temperature of the components of the reactive power compensation device exceeds the temperature threshold, and obtain a second judgment result, wherein the components of the reactive power compensation device include at least one of the following: a shunt capacitor, a reactor, and a switching switch, and the safety temperature threshold range of the shunt capacitor is -5°C-45°C; Based on a neural network algorithm and according to the actual capacity of the parallel capacitor, the first judgment result and the second judgment result, the parallel capacitor is switched to perform reactive compensation.

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