Reactive compensation method based on magnetically controlled reactor and SVG

Abstract

The invention discloses a reactive compensation method based on a magnetically controlled reactor and an SVG, and the method comprises the steps: connecting a controller to a voltage data detection device and a current data detection device, and obtaining the voltage data and current data of a power transmission line; the SVG and the reactive power compensation device based on the magnetically controlled reactor are connected to a power transmission line at the same time; and 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 for the reactive power compensation device based on the magnetically controlled reactor, the reactive power compensation device based on the magnetically controlled reactor is controlled to enter a preparation stage, the controller provides the current data for the SVG, and the SVG is controlled to enter a preparation stage. Controlling the SVG to perform reactive compensation within a preset time; and after the preset time is reached, the controller controls the SVG to stop reactive compensation and controls the reactive compensation device based on the magnetically controlled reactor to continue reactive compensation. According to the invention, the reactive compensation efficiency and reliability of the power transmission line can be improved, and the operation cost can be effectively controlled.

Description

Technical Field

[0001] The 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] The full name of magnetically controlled reactors is magnetic valve controllable reactors, referred to as MCR. It is a shunt reactor with adjustable capacity, mainly used for reactive power compensation in power systems. The reactive power compensation device based on magnetically controlled reactors can also be called a magnetically controlled dynamic reactive power compensation device. Its working principle is to connect a set of magnetically controlled reactors in parallel to an ordinary capacitor bank. The magnetically controlled reactor adopts the principle of DC magnetic assistance, uses additional DC excitation to magnetize the iron core, changes the magnetic permeability of the iron core, and realizes the continuous adjustment of the reactance value, thereby adjusting the output capacity of the reactor. The capacity of the reactor and the capacity of the capacitor offset each other, and the flexible compensation of reactive power can be realized. In addition, the reactive power compensation device based on magnetically controlled reactors also has the advantages of easy installation, maintenance-free, and low loss. However, the response time of the reactive power compensation device based on magnetically controlled reactors is usually 100-300ms, which is relatively long. Therefore, the reactive power compensation device based on magnetically controlled reactors alone cannot timely compensate the reactive power of the transmission line, cannot meet the needs of actual production well, and affects the working efficiency of the power system. 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 a transmission line and effectively control the operating cost.

[0005] In order to achieve these purposes 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] The SVG and the reactive compensation device based on the 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 stage, and the preparation stage 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, when performing reactive power compensation on the transmission line, adjusts the current of the transmission line according to the current data of 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 reactor to continue performing reactive power compensation on the transmission line, wherein, when the reactive power compensation device based on the magnetically controlled reactor performs reactive power compensation on the transmission line, 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 until the voltage data of the transmission line reaches the preset voltage range.

[0009] Preferably, in the reactive power compensation method based on the magnetically controlled reactor and the SVG, the preset time is determined in the following manner: in the test phase, when the current data exceeds the preset current data range or the voltage data exceeds the 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, 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 being the time from when the controller sends a reactive power compensation control signal to the reactive power compensation device based on the magnetically controlled reactor to when the reactive power compensation device based on the magnetically controlled reactor starts to perform reactive power compensation on the transmission line, and the preset time is determined according to the response time of the reactive power compensation device based on the magnetically controlled reactor obtained in the test phase.

[0010] Preferably, in the reactive power compensation method based on a magnetically controlled reactor and 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 the magnetically controlled inductor and 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 is calculated, the maximum value is added to the difference, and the calculated value is used as the preset time.

[0012] Preferably, in the reactive power compensation method based on the magnetically controlled reactor and the 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 reactor, and the reactive power 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 power compensation by the SVG, and then the reactive power 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.

[0013] Preferably, in the reactive power compensation method based on the magnetically controlled inductor and the SVG, the controller monitors the working state of the SVG when performing reactive power compensation on the transmission line, and 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 working state 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 a 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, and the preparation stage lasts After 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 the controller controls the reactive power compensation device based on the magnetically controlled reactor to continue performing reactive power compensation on the transmission line, wherein when the reactive power compensation device based on the magnetically controlled reactor performs reactive power compensation on the transmission line, 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 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 reactor 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 reactor completes the preparation work required for the response, and then the reactive power compensation device based on the magnetically controlled reactor performs reactive power compensation, thereby reducing the waiting time of the power system and improving the reactive power compensation efficiency for the transmission line. Meanwhile, the SVG is only used as a supplement, which can effectively control the operating cost.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part 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 The block diagram of the reactive power compensation system based on the magnetically controlled reactor and SVG provided by the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in 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 implemented by a reactive power compensation system based on magnetically controlled reactor and SVG. The structure of the system 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 The controller enters a preparation stage, 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 the controller controls the reactive power compensation device based on the magnetically controlled reactor to continue to perform reactive power compensation on the transmission line, wherein when the reactive power compensation device based on the magnetically controlled reactor performs reactive power compensation on the transmission line, 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 until the voltage data of the transmission line reaches the preset voltage range.

[0022] Static VAR generator (SVG) is a reactive power compensation device with superior performance, which uses electric energy 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 load reactive current, while others are passive and rely on the properties of passive devices to perform reactive power compensation. SVG has a fast response speed, usually only 1ms. However, the operation of SVG depends 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 time, 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 cost.

[0023] The reactive power compensation device based on magnetically controlled reactor realizes reactive power compensation for the transmission line by adjusting the voltage of the transmission line. SVG realizes reactive power compensation for the transmission line by adjusting the current of the transmission line. Therefore, it is necessary to obtain the current data and voltage data of the transmission line at the same time.

[0024] When the voltage data or current data of the transmission line exceeds the corresponding preset range and reactive power compensation is required for the transmission line, the controller provides the voltage data to the reactive power compensation device based on the magnetically controlled reactor, so that it enters the preparation stage, and provides the current data to the SVG. The SVG can respond in a very short time and perform reactive power compensation for the transmission line. After the preset time, the reactive power compensation device based on the magnetically controlled reactor completes the preparation work, and then the reactive power compensation device based on the magnetically controlled reactor continues to perform reactive power compensation for 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, 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 being the time from when the controller sends a reactive power compensation control signal to the reactive power compensation device based on the magnetically controlled reactor to when the reactive power compensation device based on the magnetically controlled reactor starts to perform reactive power compensation on the transmission line, and the preset time is determined according to the response time of the reactive power compensation device based on the magnetically controlled reactor obtained in the test phase.

[0026] The preset time can be determined according to the response time of the reactive compensation device based on the magnetically controlled reactor. Therefore, a test phase must be designed, during which the SVG remains in a non-operating state and only relies on the reactive compensation device based on the magnetically controlled reactor for reactive compensation. During the test phase, the time from when the controller sends a reactive compensation control signal to the reactive compensation device based on the magnetically controlled reactor to when the reactive compensation device based on the magnetically controlled reactor starts to perform reactive compensation on the transmission line can be taken as its response time.

[0027] In a preferred embodiment, in the reactive power compensation method based on a magnetically controlled reactor and 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.

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

[0029] In a preferred embodiment, 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 is calculated, the maximum value is added to the difference, and the calculated value is used as the preset time.

[0030] The preset time is determined based on the maximum value of multiple response times of the reactive compensation device based on the magnetically controlled reactor. The reason is as follows: Assuming that the preset time is smaller than the maximum value, if reactive compensation is required for a transmission line at a certain time, the SVG has been working for the preset time. At this time, the reactive compensation device based on the magnetically controlled reactor has not completed the preparation work and cannot respond immediately. At this time, the SVG has stopped working, which will cause the transmission line to wait for the reactive compensation device based on the magnetically controlled reactor for a short time, affecting the efficiency of reactive compensation for the transmission line. It can be seen that the preset time must be 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 amplitude of the response time of the reactive compensation device based on the magnetically controlled reactor. Therefore, by adding the fluctuation amplitude to the maximum value to calculate the preset time, it can be basically guaranteed that the reactive compensation device based on the magnetically controlled reactor completes its preparation work, and ensures that after the SVG stops working, the reactive compensation device based on the magnetically controlled reactor can immediately take over the reactive compensation for the transmission line.

[0031] In a preferred embodiment, in the reactive power compensation method based on a magnetically controlled reactor 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 reactor, and the reactive power 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 power compensation by the SVG, and then the reactive power 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.

[0032] In the preparation stage, the reactive power compensation device based on the magnetically controlled reactor determines the compensation amount according to the voltage data received at that time. However, in the preparation stage, the SVG has already performed reactive power compensation on the transmission line, so the voltage data has changed in real time. Therefore, when the preset time is reached, the latest voltage data is provided to the reactive power compensation device based on the magnetically controlled reactor, which corrects the compensation amount determined in the preparation stage, that is, increases or decreases the compensation amount, and then performs reactive power compensation according to 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 working state 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 working state 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 any of the SVG or the reactive power compensation device based on the magnetically controlled reactor fails, the other device will take over the work of the failed device to ensure that the transmission line can be compensated in time. This design can improve the reliability of the method of the present invention.

[0036] In summary, the present invention provides a reactive power compensation device based on a magnetically controlled reactor 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 reactor completes the preparation work required for the response, and then the reactive power compensation device based on the magnetically controlled reactor performs reactive power compensation, thereby reducing the waiting time of the power system and improving the reactive power compensation efficiency for the transmission line. At the same time, the SVG is only used as a supplement, which can effectively control the operating cost.

[0037] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A reactive power compensation method based on a magnetically controlled reactor and 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 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, wherein the SVG performs reactive compensation on the transmission line according to the The controller adjusts the current of the transmission line according to the current data of 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, when the reactive compensation device based on the magnetically controlled reactor performs reactive compensation on the transmission line, 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 until the voltage data of the transmission line reaches the preset voltage range.

2. The reactive power compensation method based on a magnetically controlled reactor and SVG according to claim 1, characterized in that: The preset time is determined in the following manner: in 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, 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 being the time from when the controller sends a reactive compensation control signal to the reactive compensation device based on the magnetically controlled reactor to when the reactive compensation device based on the magnetically controlled reactor starts to perform reactive compensation on the transmission line, and the preset time is determined according to the response time of the reactive compensation device based on the magnetically controlled reactor obtained in the test phase.

3. The reactive power compensation method based on a magnetically controlled reactor and SVG according to claim 2, characterized in that: 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.

4. The reactive power compensation method based on magnetically controlled reactor and SVG as claimed in claim 3, characterized in that: Take the maximum and minimum values ​​of multiple response times of the reactive compensation device based on the magnetically controlled reactor 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.

5. The reactive power compensation method based on magnetically controlled reactor and 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, and then the controller 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, and then 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.

6. The reactive power compensation method based on magnetically controlled reactor and SVG according to claim 1, characterized in that: The controller monitors the working state 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.

7. The reactive power compensation method based on a magnetically controlled reactor and SVG according to claim 1, characterized in that: The controller monitors the working state 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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