Reactive power compensation method based on magnetic control reactor and SVG

Abstract

The application discloses a kind of reactive power compensation methods based on magnetocontrol electric reactance and SVG, comprising: connecting controller to voltage data detection device and current data detection device, obtain the voltage data and current data of transmission line;SVG and reactive power compensation device based on magnetocontrol electric reactance are simultaneously connected to transmission line;When current data exceeds preset current data range or voltage data exceeds preset voltage data range, controller provides voltage data to reactive power compensation device based on magnetocontrol electric reactance, controls reactive power compensation device based on magnetocontrol electric reactance to enter preparation stage, controller provides current data to SVG, controls SVG to carry out reactive power compensation within preset time;After reaching preset time, controller controls SVG to stop reactive power compensation, controls reactive power compensation device based on magnetocontrol electric reactance to continue reactive power compensation.The application can improve the efficiency and reliability of reactive power compensation for transmission line, and effectively control operating cost.

Description

Technical Field

[0001] The present invention relates to the technical field of reactive power compensation, and in particular to a reactive power compensation method based on a magnetically controlled reactor and an SVG. Background Art

[0002] Magnetically controlled reactors (MCRs), also known as magnetically controlled reactors (MCRs), are shunt reactors with adjustable capacity, primarily used for reactive power compensation in power systems. Reactive power compensation devices based on magnetically controlled reactors, also known as magnetically controlled dynamic reactive power compensation devices, operate by connecting a set of magnetically controlled reactors in parallel to a conventional capacitor bank. Magnetically controlled reactors utilize the principle of DC magnetic assistance, using additional DC excitation to magnetize the core, changing the core's magnetic permeability and achieving continuous adjustment of the reactance value, thereby adjusting the reactor's output capacity. By offsetting the reactor's capacity with the capacitor's, flexible reactive power compensation is achieved. Furthermore, reactive power compensation devices based on magnetically controlled reactors offer the advantages of easy installation, maintenance-free operation, and low losses. However, reactive power compensation devices based on magnetically controlled reactors typically have a relatively long response time of 100-300 ms. Therefore, reactive power compensation devices based solely on magnetically controlled reactors cannot provide timely reactive power compensation for transmission lines, fail to meet actual production needs, and affect power system efficiency. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0004] An object of the present invention is to provide a reactive power compensation method based on a magnetically controlled reactor and an SVG, which can improve the efficiency and reliability of reactive power compensation for transmission lines and effectively control operating costs.

[0005] In order to achieve these objectives and other advantages according to the present invention, a reactive power compensation method based on a magnetically controlled reactor and an SVG is provided, comprising:

[0006] Connecting a voltage data detection device and a current data detection device to a power transmission line respectively, wherein the voltage data detection device detects voltage data of the power transmission line, and the current data detection device detects current data of the power transmission line in real time;

[0007] Connecting a controller to the voltage data detection device and the current data detection device to obtain voltage data and current data of the transmission line;

[0008] An SVG and a reactive compensation device based on a magnetically controlled reactor are simultaneously connected to the transmission line, and the controller is connected to the SVG and the reactive compensation device based on the magnetically controlled reactor; when the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller provides the voltage data of the transmission line to the reactive compensation device based on the magnetically controlled reactor, and the controller controls the reactive compensation device based on the magnetically controlled reactor to enter a preparation phase, which lasts for a preset time, and the controller provides the current data of the transmission line to the SVG, and the controller controls the SVG to perform reactive compensation on the transmission line within the preset time. compensation, wherein the SVG adjusts the current of the transmission line according to the current data of the transmission line when performing reactive power compensation on the transmission line; when the preset time is reached, the controller controls the SVG to stop performing reactive power compensation on the transmission line, and the controller controls the reactive power compensation device based on the magnetically controlled inductor to continue performing reactive power compensation on the transmission line, wherein the reactive power compensation device based on the magnetically controlled inductor adjusts the voltage of the transmission line according to the voltage data of the transmission line when performing reactive power compensation on the transmission line, until the voltage data of the transmission line reaches the preset voltage range.

[0009] Preferably, in the reactive power compensation method based on a magnetically controlled reactor and an SVG, the preset time is determined in the following manner: during a test phase, when the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller controls the SVG to remain in an inoperative state, the controller provides the voltage data of the transmission line to the reactive power compensation device based on the magnetically controlled reactor, the controller controls the reactive power compensation device based on the magnetically controlled reactor to perform reactive power compensation on the transmission line, and the controller records a response time of the reactive power compensation device based on the magnetically controlled reactor, the response time of the reactive power compensation device based on the magnetically controlled reactor being the time from the controller sending a reactive power compensation control signal to the reactive power compensation device based on the magnetically controlled reactor to the time the reactive power compensation device based on the magnetically controlled reactor starts performing reactive power compensation on the transmission line. The preset time is determined based on the response time of the reactive power compensation device based on the magnetically controlled reactor obtained during the test phase.

[0010] Preferably, in the reactive power compensation method based on a magnetically controlled reactor and an SVG, the preset time is determined according to multiple response times of the reactive power compensation device based on the magnetically controlled reactor obtained in multiple test phases.

[0011] Preferably, in the reactive power compensation method based on a magnetically controlled inductor and an SVG, the maximum and minimum values ​​of multiple response times of the reactive power compensation device based on the magnetically controlled inductor obtained in multiple test stages are taken, the difference between the maximum and the minimum values ​​is calculated, the maximum value and the difference are added, and the calculated value is used as the preset time.

[0012] Preferably, in the reactive power compensation method based on a magnetically controlled inductor and an SVG, after the preset time is reached and the controller controls the SVG to stop performing reactive power compensation on the transmission line, the controller sends the current voltage data of the transmission line after reactive power compensation by the SVG to the reactive power compensation device based on the magnetically controlled inductor, and the reactive power compensation device based on the magnetically controlled inductor corrects the compensation amount determined in the preparation stage according to the current voltage data of the transmission line after reactive power compensation by the SVG, and then the reactive power compensation device based on the magnetically controlled inductor adjusts the voltage of the transmission line according to the correction result until the voltage data of the transmission line reaches the preset voltage range.

[0013] Preferably, in the reactive power compensation method based on a magnetically controlled inductor and an SVG, the controller monitors the working status of the SVG when performing reactive power compensation on the transmission line. When the SVG fails, the controller controls the reactive power compensation device based on the magnetically controlled inductor to replace the SVG to perform reactive power compensation on the transmission line.

[0014] Preferably, in the reactive power compensation method based on a magnetically controlled reactor and an SVG, the controller monitors the operating status of the reactive power compensation device based on the magnetically controlled reactor when performing reactive power compensation on the transmission line. When the reactive power compensation device based on the magnetically controlled reactor fails, the controller controls the SVG to replace the reactive power compensation device based on the magnetically controlled reactor to perform reactive power compensation on the transmission line.

[0015] The present invention has at least the following beneficial effects:

[0016] The present invention provides a reactive power compensation method based on a magnetically controlled reactor and an SVG, comprising:

[0017] A voltage data detection device and a current data detection device are connected to the transmission line respectively, the voltage data detection device detects the voltage data of the transmission line, and the current data detection device detects the current data of the transmission line in real time; a controller is connected to the voltage data detection device and the current data detection device to obtain the voltage data and current data of the transmission line; an SVG and a reactive compensation device based on a magnetically controlled reactor are connected to the transmission line at the same time, and the controller is connected to the SVG and the reactive compensation device based on the magnetically controlled reactor; when the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller provides the voltage data of the transmission line to the reactive compensation device based on the magnetically controlled reactor, and the controller controls the reactive compensation device based on the magnetically controlled reactor to enter a preparation stage, which lasts for a period of 1 second. For a preset time, the controller provides the current data of the transmission line to the SVG, and the controller controls the SVG to perform reactive compensation on the transmission line within the preset time, wherein the SVG adjusts the current of the transmission line according to the current data of the transmission line when performing reactive compensation on the transmission line; when the preset time is reached, the controller controls the SVG to stop performing reactive compensation on the transmission line, and the controller controls the reactive compensation device based on the magnetically controlled reactor to continue performing reactive compensation on the transmission line, wherein the reactive compensation device based on the magnetically controlled reactor adjusts the voltage of the transmission line according to the voltage data of the transmission line when performing reactive compensation on the transmission line, until the voltage data of the transmission line reaches the preset voltage range. The present invention simultaneously provides a reactive power compensation device based on a magnetically controlled inductor and an SVG. When reactive power compensation is required, the SVG is first activated for reactive power compensation. After a preset time has passed, the reactive power compensation device based on the magnetically controlled inductor completes the necessary preparations for a response. Then, the reactive power compensation device based on the magnetically controlled inductor performs reactive power compensation. This reduces the waiting time of the power system and improves the reactive power compensation efficiency of the transmission line. Meanwhile, the SVG only serves as a supplement, which can effectively control operating costs.

[0018] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a block diagram of the reactive power compensation system based on magnetically controlled reactors and SVG provided by the present invention. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0021] The reactive power compensation method based on magnetically controlled reactor and SVG provided by the present invention is realized by a reactive power compensation system based on magnetically controlled reactor and SVG. The system structure is as follows: Figure 1 As shown. The present invention provides a reactive power compensation method based on a magnetically controlled reactor and an SVG, comprising: connecting a voltage data detection device and a current data detection device to a transmission line respectively, wherein the voltage data detection device detects the voltage data of the transmission line, and the current data detection device detects the current data of the transmission line in real time; connecting a controller to the voltage data detection device and the current data detection device to obtain the voltage data and current data of the transmission line; connecting the SVG and a reactive power compensation device based on a magnetically controlled reactor to the transmission line at the same time, and connecting the controller to the SVG and the reactive power compensation device based on the magnetically controlled reactor; when the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller provides the voltage data of the transmission line to the reactive power compensation device based on the magnetically controlled reactor, and the controller controls the reactive power compensation device based on the magnetically controlled reactor to generate a voltage signal. The controller enters a preparation phase, which lasts for a preset time. The controller provides the current data of the transmission line to the SVG, and the controller controls the SVG to perform reactive power compensation on the transmission line within the preset time, wherein the SVG adjusts the current of the transmission line according to the current data of the transmission line when performing reactive power compensation on the transmission line. When the preset time is reached, the controller controls the SVG to stop performing reactive power compensation on the transmission line, and controls the reactive power compensation device based on the magnetically controlled reactor to continue performing reactive power compensation on the transmission line, wherein the reactive power compensation device based on the magnetically controlled reactor adjusts the voltage of the transmission line according to the voltage data of the transmission line when performing reactive power compensation on the transmission line, until the voltage data of the transmission line reaches the preset voltage range.

[0022] The static VAR generator (SVG) is a reactive power compensation device with superior performance, which uses power conversion technology to achieve reactive power compensation. The biggest difference between SVG and others is that it can actively emit reactive current to compensate for the reactive current of the load, while others are passive and rely on the properties of the passive components themselves for reactive power compensation. SVG has a fast response speed, usually only 1ms. However, the operation of SVG relies on complex control systems and power electronics technology, with high operating costs and difficult maintenance. Therefore, the present invention still uses the reactive power compensation device based on magnetically controlled reactors as the main reactive power compensation equipment, and uses SVG as a supplement to the reactive power compensation device based on magnetically controlled reactors. On the one hand, it can respond to the transmission line in a timely manner, shorten the overall response time, and improve the efficiency of reactive power compensation for the transmission line. On the other hand, it can effectively control the operating costs.

[0023] Reactive power compensation devices based on magnetically controlled reactors compensate for reactive power on transmission lines by adjusting the voltage of the transmission lines. SVGs compensate for reactive power on transmission lines by adjusting the current of the transmission lines. Therefore, it is necessary to obtain both current and voltage data on the transmission lines.

[0024] When the voltage or current data of a transmission line exceeds a preset range and reactive power compensation is required, the controller provides the voltage data to the reactive power compensation device based on a magnetically controlled reactor, prompting it to enter a preparation phase. The controller also provides the current data to the SVG, which responds within a very short period of time and performs reactive power compensation on the transmission line. After the preset time has elapsed, the reactive power compensation device based on the magnetically controlled reactor completes its preparation phase and then continues to perform reactive power compensation on the transmission line.

[0025] In a preferred embodiment, in the reactive power compensation method based on a magnetically controlled reactor and an SVG, the preset time is determined in the following manner: in a test phase, when the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller controls the SVG to remain in an inoperative state, the controller provides the voltage data of the transmission line to the reactive power compensation device based on the magnetically controlled reactor, the controller controls the reactive power compensation device based on the magnetically controlled reactor to perform reactive power compensation on the transmission line, and the controller records the response time of the reactive power compensation device based on the magnetically controlled reactor. The response time of the reactive power compensation device based on the magnetically controlled reactor is the time from the time the controller sends a reactive power compensation control signal to the reactive power compensation device based on the magnetically controlled reactor to the time the reactive power compensation device based on the magnetically controlled reactor starts to perform reactive power compensation on the transmission line. The preset time is determined based on the response time of the reactive power compensation device based on the magnetically controlled reactor obtained during the test phase.

[0026] The preset time can be determined according to the response time of the magnetic control reactor based reactive power compensation device. Therefore, a test stage is designed, in which the SVG remains in a non-working state and only relies on the magnetic control reactor based reactive power compensation device for reactive power compensation. In the test stage, the time from when the controller sends a control signal for reactive power compensation to the magnetic control reactor based reactive power compensation device to when the magnetic control reactor based reactive power compensation device starts to compensate the power transmission line can be taken as the response time of the magnetic control reactor based reactive power compensation device.

[0027] In a preferred embodiment, the preset time is determined according to the response times of the magnetic control reactor based reactive power compensation device obtained in multiple test stages.

[0028] The response time of the magnetic control reactor based reactive power compensation device has a range and is not the same each time it is started. Therefore, multiple tests can be performed to obtain the response time of the magnetic control reactor based reactive power compensation device in each test stage, and then the preset time can be determined according to the multiple response times, thereby improving the accuracy of the preset time and the efficiency of the reactive power compensation for the power transmission line.

[0029] In a preferred embodiment, the maximum value and the minimum value of the multiple response times of the magnetic control reactor based reactive power compensation device obtained in multiple test stages are taken, the difference between the maximum value and the minimum value is calculated, the maximum value is added to the difference, and the calculated value is taken as the preset time.

[0030] The reason for determining the preset time based on the maximum value of the multiple response times of the magnetic control reactor based reactive power compensation device is as follows: assuming that the preset time is less than the maximum value, if the power transmission line needs to be compensated for reactive power at this time, the SVG has already worked for the preset time, at which time the magnetic control reactor based reactive power compensation device has not completed the preparation work and cannot immediately respond, while the SVG has stopped working at this time, which will cause a short waiting time for the magnetic control reactor based reactive power compensation device to exist in the power transmission line, affecting the efficiency of the reactive power compensation for the power transmission line. Therefore, the preset time is at least equal to the maximum value or greater than the maximum value. The difference between the maximum value and the minimum value of the response time reflects the fluctuation range of the response time of the magnetic control reactor based reactive power compensation device. Therefore, the fluctuation range is added to the maximum value to calculate the preset time, which can basically ensure that the magnetic control reactor based reactive power compensation device completes its preparation work and ensures that the magnetic control reactor based reactive power compensation device can immediately take over the reactive power compensation for the power transmission line after the SVG stops working.

[0031] In a preferred embodiment, in the reactive power compensation method based on a magnetically controlled inductor and an SVG, after the preset time is reached and the controller controls the SVG to stop performing reactive power compensation on the transmission line, the controller sends the current voltage data of the transmission line after reactive power compensation by the SVG to the reactive power compensation device based on the magnetically controlled inductor. The reactive power compensation device based on the magnetically controlled inductor corrects the compensation amount determined in the preparation stage according to the current voltage data of the transmission line after reactive power compensation by the SVG. Thereafter, the reactive power compensation device based on the magnetically controlled inductor adjusts the voltage of the transmission line according to the correction result until the voltage data of the transmission line reaches the preset voltage range.

[0032] During the preparation phase, the reactive power compensation device based on the magnetically controlled reactor determines the compensation amount based on the voltage data received at that time. However, during this phase, the SVG has already been performing reactive power compensation on the transmission line, so the voltage data is already changing in real time. Therefore, at the scheduled time, the latest voltage data is provided to the reactive power compensation device based on the magnetically controlled reactor. The device then adjusts the compensation amount determined during the preparation phase, increasing or decreasing it. Reactive power compensation is then performed based on the correction result. The compensation amount can be a voltage value or a reactive power value.

[0033] In a preferred embodiment, in the reactive power compensation method based on a magnetically controlled inductor and an SVG, the controller monitors the operating status of the SVG when performing reactive power compensation on the transmission line. When the SVG fails, the controller controls the reactive power compensation device based on the magnetically controlled inductor to replace the SVG to perform reactive power compensation on the transmission line.

[0034] In a preferred embodiment, in the reactive power compensation method based on a magnetically controlled reactor and an SVG, the controller monitors the operating status of the reactive power compensation device based on the magnetically controlled reactor when performing reactive power compensation on the transmission line. When the reactive power compensation device based on the magnetically controlled reactor fails, the controller controls the SVG to replace the reactive power compensation device based on the magnetically controlled reactor to perform reactive power compensation on the transmission line.

[0035] If either the SVG or the magnetically controlled reactor-based reactive power compensation device fails, the other device will take over to ensure that the transmission line can be compensated in a timely manner. This design can improve the reliability of the method of the present invention.

[0036] In summary, the present invention simultaneously provides a reactive power compensation device based on a magnetically controlled inductor and an SVG. When reactive power compensation is required, the SVG is first started to perform reactive power compensation. After a preset time has passed, the reactive power compensation device based on the magnetically controlled inductor completes the necessary preparations for a response. Then, the reactive power compensation device based on the magnetically controlled inductor performs reactive power compensation. This reduces the waiting time of the power system and improves the reactive power compensation efficiency for the transmission line. At the same time, the SVG only serves as a supplement and can effectively control operating costs.

[0037] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and exemplary embodiments. They can be applied to a variety of fields suitable for the present invention. Further modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims

1. A reactive power compensation method based on a magnetically controlled reactor and an SVG, characterized in that: include: Connecting a voltage data detection device and a current data detection device to a power transmission line respectively, wherein the voltage data detection device detects voltage data of the power transmission line, and the current data detection device detects current data of the power transmission line in real time; Connecting a controller to the voltage data detection device and the current data detection device to obtain voltage data and current data of the transmission line; Connecting the SVG and the reactive power compensation device based on the magnetically controlled reactor to the transmission line at the same time, and connecting the controller to the SVG and the reactive power compensation device based on the magnetically controlled reactor; When the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller provides the voltage data of the transmission line to the reactive power compensation device based on the magnetically controlled reactor, and controls the reactive power compensation device based on the magnetically controlled reactor to enter a preparation phase, which lasts for a preset time. The controller provides the current data of the transmission line to the SVG, and controls the SVG to perform reactive power compensation on the transmission line within the preset time, wherein the SVG adjusts the current of the transmission line according to the current data of the transmission line when performing reactive power compensation on the transmission line. When the preset time is reached, the controller controls the SVG to stop performing reactive power compensation on the transmission line, and controls the reactive power compensation device based on the magnetically controlled reactor to continue performing reactive power compensation on the transmission line, wherein the reactive power compensation device based on the magnetically controlled reactor adjusts the voltage of the transmission line according to the voltage data of the transmission line when performing reactive power compensation on the transmission line until the voltage data of the transmission line reaches a preset voltage range. The preset time is determined in the following manner: during the test phase, when the current data exceeds a preset current data range or the voltage data exceeds a preset voltage data range, the controller controls the SVG to remain in an inoperative state, the controller provides the voltage data of the transmission line to the reactive compensation device based on the magnetically controlled reactor, the controller controls the reactive compensation device based on the magnetically controlled reactor to perform reactive compensation on the transmission line, and the controller records the response time of the reactive compensation device based on the magnetically controlled reactor. The response time of the reactive compensation device based on the magnetically controlled reactor is the time from the controller sending a reactive compensation control signal to the reactive compensation device based on the magnetically controlled reactor to the time the reactive compensation device based on the magnetically controlled reactor starts to perform reactive compensation on the transmission line. The preset time is determined based on the response time of the reactive compensation device based on the magnetically controlled reactor obtained during the test phase.

2. The reactive power compensation method based on a magnetically controlled reactor and an SVG according to claim 1, characterized in that: The preset time is determined according to multiple response times of the reactive compensation device based on the magnetically controlled reactor obtained in multiple test phases.

3. The reactive power compensation method based on a magnetically controlled reactor and an SVG according to claim 2, characterized in that: Take the maximum and minimum values ​​of multiple response times of the reactive compensation device based on the magnetically controlled inductor obtained in multiple test stages, calculate the difference between the maximum and the minimum, add the maximum and the difference, and use the calculated value as the preset time.

4. The reactive power compensation method based on a magnetically controlled reactor and an SVG according to claim 1, characterized in that: After the preset time is reached, the controller controls the SVG to stop performing reactive compensation on the transmission line. The controller then sends the current voltage data of the transmission line after reactive compensation by the SVG to the reactive compensation device based on the magnetically controlled reactor. The reactive compensation device based on the magnetically controlled reactor corrects the compensation amount determined in the preparation stage according to the current voltage data of the transmission line after reactive compensation by the SVG. Thereafter, the reactive compensation device based on the magnetically controlled reactor adjusts the voltage of the transmission line according to the correction result until the voltage data of the transmission line reaches the preset voltage range.

5. The reactive power compensation method based on a magnetically controlled reactor and an SVG according to claim 1, characterized in that: The controller monitors the working status of the SVG when performing reactive power compensation on the transmission line. When the SVG fails, the controller controls the reactive power compensation device based on the magnetically controlled reactor to replace the SVG to perform reactive power compensation on the transmission line.

6. The reactive power compensation method based on a magnetically controlled reactor and an SVG according to claim 1, characterized in that: The controller monitors the working status of the reactive compensation device based on the magnetically controlled reactor when performing reactive compensation on the transmission line. When the reactive compensation device based on the magnetically controlled reactor fails, the controller controls the SVG to replace the reactive compensation device based on the magnetically controlled reactor to perform reactive compensation on the transmission line.

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