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Flexible direct current transmission converter valve detection system and method

A flexible DC transmission and detection system technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as comparison, difficulty in detection results, direct comparison and evaluation of the overall performance of converter valves, etc.

Active Publication Date: 2021-02-09
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

[0004] When implementing the embodiment of the present invention, the inventor found that domestic and foreign flexible direct current converter valve equipment manufacturers build valve sections or small physical prototypes before the converter valves leave the factory, and only conduct type tests on the converter valves produced by themselves, and the testing cost High, and it is difficult to compare the test results with other manufacturers, which makes it difficult to directly compare and evaluate the overall performance of the converter valves of different equipment manufacturers, and lacks a technology for direct comparison, detection and analysis of converter valves from different equipment manufacturers

Method used

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  • Flexible direct current transmission converter valve detection system and method
  • Flexible direct current transmission converter valve detection system and method
  • Flexible direct current transmission converter valve detection system and method

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Embodiment 1

[0042]It should be noted that in the prior art, before the converter valve leaves the factory, the manufacturer conducts a type test on the converter valve by building a valve section or a small physical prototype, and the type test can be divided into two types: operation test and insulation test. The purpose of the operation test is to check whether the valve and related circuits are suitable for current, voltage and temperature when they are in the on-state, on-off and off-state under the most severe repeated action conditions in the operating state, and at the same time prove that the valve electronic circuit The correctness of the interaction with the main circuit of the valve; the insulation test of the converter valve is mainly divided into the insulation resistance between the valve bracket and the valve end. Therefore, the insulation type test includes the insulation of the valve bracket, and the insulation assessment of the converter valve is mainly divided into the i...

Embodiment 2

[0083] see Figure 4 Figure 4 It is a schematic flowchart of a detection method for a converter valve of a flexible direct current transmission system provided by Embodiment 2 of the present invention.

[0084] S11. Obtain the detection data of N tested converter valves; wherein, the tested converter valves are connected to one end of the electrical connection device and connected to the double-ended back-to-back flexible direct current transmission prototype to replace the other end of the electrical connection device. The bridge arm corresponding to the bridge arm interface of the double-ended back-to-back flexible DC power transmission prototype connected at one end; wherein, the detection data includes AC voltage, AC current, DC voltage and DC current; wherein, N is greater than or equal to 1;

[0085] S12. Obtain the modulated wave output by the pole control device according to the detection data;

[0086] S13. Obtain control signals output by self-contained valve cont...

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Abstract

The invention discloses a flexible direct current transmission converter valve detection system and method, including a double-end back-to-back flexible direct current transmission prototype, a communication interface device and N electrical connection devices; the prototype includes a corresponding bridge arm, a collection device and a pole control device; the electrical connection device is used It is used to connect the test bridge arm of the prototype and the tested converter valve to adapt to the electrical interface of different manufacturers; the communication interface device is used to connect the self-contained, original valve control device and pole control device of the tested converter valve to realize automatic control. Transmission of signals between belt and original valve control and extreme control; the acquisition device is used to transmit the collected voltage and current data of the prototype to the extreme control device; the extreme control device outputs modulated waves to all valves after processing the received data control device, so that the valve control device outputs a control signal to the corresponding converter valve after processing according to the modulation wave, and outputs the corresponding voltage and current after the measured converter valve works according to the control signal, and the acquisition device collects Detection data such as voltage and current realizes closed-loop detection.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a detection system and method for a converter valve of flexible direct current transmission. Background technique [0002] In recent years, with the development of power electronic devices and the application of renewable energy generation technologies such as wind power and solar energy, flexible direct current transmission technology has been rapidly developed and applied at home and abroad. Compared with the traditional high-voltage direct current transmission technology, flexible direct current transmission is a new type of direct current transmission with more flexible control and less harmonics. The system has been widely used in the fields of new energy grid connection, island power supply and asynchronous networking. The flexible DC transmission system based on Modular Multilevel Converter (MMC, Modular Multilevel Converter) has unique advant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 熊岩饶宏许树楷李岩朱喆周月宾
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD