High-voltage direct current system rapid bypass series compensation device control method

A technology of bypass series compensation and high-voltage direct current, applied in the field of electric power, can solve the problems that affect the stable operation of the system, the problem of resonance and harmonic cannot be effectively solved, unstable harmonic resonance and other problems, and achieve the effect of convenient simulation analysis

Pending Publication Date: 2018-09-14
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the harmonic resonance problem in "power electronic power system" is both a hot spot and a difficult point. In terms of harmonic generation and development, it is largely related to the nonlinear characteristics of traditional components in AC systems under special working conditions (such as series Compensation for MOV volt-ampere characteristics, distribution parameter characteristics, etc.), and its excitation, propagation and amplification methods are complex and diverse
[0004] When implementing the present invention, the inventor found that in the prior art, the existing series compensator and the HVDC transmission system are independent control and operation platforms, and the analysis of the harmonic resonance problem lacks test platform support. The problem of harmonic resonance between AC and DC systems with series compensators cannot be effectively solved, and unstable harmonic resonance poses a great threat to the safe operation of transformers, capacitors and other components, and in severe cases may also cause equipment overcurrent or Damaged by overvoltage, which will affect the stable operation of the system

Method used

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  • High-voltage direct current system rapid bypass series compensation device control method
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  • High-voltage direct current system rapid bypass series compensation device control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] see figure 1 , an embodiment of the present invention provides a control method for fast bypass series compensation equipment in a high-voltage direct current system, including a power supply device 10, a main control device 20, a switch device 30, a series compensation device 40, and a direct current transmission device 50;

[0099] The output terminal of the power supply device 10 is respectively connected to the power supply terminal of the main control device 20 and the power supply terminal of the switching device 30;

[0100] The input end of the main control device 20 is connected to the output end of the direct current transmission device 50, and the output end of the main control device 20 is connected to the input end of the switching device 30;

[0101] The input end of the series compensation device 40 is connected to the output end of the switching device 30, and the series compensation end of the series compensation device 40 is connected to the series com...

Embodiment 2

[0132] see Figure 4 , the DC power transmission device 50 includes a DC pole control module 51, a DC station control module 52, a DC rectification side 53 and a DC inverter side 54;

[0133] The output terminal of the DC transmission device 50 is connected to the output terminal of the DC station control module 52, and the series compensation input terminal of the DC transmission device 50 is connected to the series compensation input terminal of the DC inverter side 54;

[0134] The first input terminal of the DC station control module 52 is connected to the power detection terminal of the DC rectification side 53 through the DC pole control module 51;

[0135] The output end of the DC rectification side 53 is connected to the input end of the DC inverter side 54 .

[0136] In this embodiment, the DC pole control module 51 is used to collect the DC voltage and DC current of the DC rectification side 53, and then transmit the DC voltage and the DC current to the The main co...

Embodiment 3

[0149] Embodiment three, on the basis of embodiment one,

[0150] see Image 6 , the DC power transmission device 50 further includes a DC protection module 55;

[0151] The first input terminal of the DC protection module 55 is connected to the power detection terminal of the DC inverter side 54 , and the output terminal of the DC protection module 55 is connected to the second input terminal of the DC station control module 52 .

[0152] In this embodiment, the DC protection module 55 is used to collect the voltage of the DC inverter side 54, and calculate the total harmonic distortion rate of the voltage on the DC protection module 55, or the collected The voltage is transmitted to the main control device 20, so that the main control device 20 calculates the total harmonic distortion rate of the voltage, which is not specifically limited in the present invention.

[0153] It should be noted that the judgment of whether the converter station is normal or not is based on th...

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PUM

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Abstract

The present invention discloses a high-voltage direct current system rapid bypass series compensation device control method. The method comprises the steps of: an input end of a serial compensation device is connected with an output end of a direct current transmission device, an output end of the serial compensation device is connected with an input end of a switching device, the input end of theserial compensation device is connected with an output end of the switching device, a serial compensation end of the serial compensation device is connected with a serial compensation access end of the direct current transmission device, the serial compensation device comprises a serial compensation switching module and a capacitive module, the serial compensation end of the serial compensation device is connected with a serial compensation end of the capacitive module, and the input end of the serial compensation device is connected with the input end of the serial compensation switching module; and the output end of the serial compensation switching module is connected with the input end of the capacitive module. A master control device is configured to achieve the following rapid bypass serial compensation steps: obtaining the actual operation power of the direct current transmission device; and when it is detected that the actual operation power is smaller than a preset value andduration time T exceeds preset time T1, outputting a disconnection instruction to allow the serial compensation switching module to be disconnected. The high-voltage direct current system rapid bypassseries compensation device control method solves the resonance harmonic wave problem between the alternating current and direct current systems comprising serial compensators.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a control method for fast bypass series compensation equipment in a high-voltage direct current system. Background technique [0002] The unbalanced distribution of power generation resources and power loads in my country, coupled with the increasing demand for electricity, has directly led to the development of ultra-high voltage, large-scale, and long-distance power transmission in my country. In order to improve the transmission capacity of the line and enhance the stability of the system, the series compensation technology has been more and more widely used. The series compensator has the function of increasing the transmission capacity of the transmission line, improving the power flow distribution and increasing the temporary stability limit in the high-voltage AC system, and has been widely used at home and abroad. [0003] With the development of the power system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G09B23/18
CPCG09B23/188G01R31/00
Inventor 胡云郭琦关红兵罗超
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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