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Back-to-back test method of VSC-HVDC MMC valve stable state operation test

A technology of flexible DC power transmission and steady-state operation, applied in the field of power system and power electronics, can solve the problem of difficulty in constructing full-load circuit test, etc., and achieve the effect of simple adjustment of test parameters, high equivalence, and reduction of switching frequency.

Active Publication Date: 2014-05-07
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because VSC-HVDC devices generally have the characteristics of high voltage, high current, and large capacity, it is difficult to construct a full-load circuit with the same operating conditions as the actual operating conditions in the test environment for testing

Method used

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  • Back-to-back test method of VSC-HVDC MMC valve stable state operation test
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  • Back-to-back test method of VSC-HVDC MMC valve stable state operation test

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 is the electrical structure diagram of the valve assembly, wherein the valve assembly is composed of n sub-modules in series, n depends on the number of sub-modules contained in the valve assembly in the actual project, and n is different for different projects.

[0034] The sub-module is composed of a half-bridge structure and a sub-module capacitor in parallel; or the sub-module is composed of an H-bridge structure and a sub-module capacitor in parallel; the sub-module capacitor is C SM1n ;

[0035] The half-bridge structure or the H-bridge structure both includes a switch K 1n , Thyristor T 1n , resistance R 1n , IGBT device (T 1n1 , T 1n2 ) and diode D 1n1 and D 1n2 ;

[0036] The IGBT device T 1n1 Anti-parallel diode D 1n1 Composing the IGBT module 1; the IGBT device T 1n2 Anti-parallel d...

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Abstract

The invention provides a back-to-back test method of a VSC-HVDC MMC valve stable state operation test. Devices used in the method comprise a rectification side, an inversion side and a supporting capacitor. The rectification side and the inversion side are in parallel connection at two sides of the supporting capacitor respectively to form a back-to-back circuit. Through controlling submodules of valve modules of the rectification side and the inversion side, stable state operation voltage, current and heat intensity equal to actual condition are obtained. According to the invention, the rectification side and the inversion side share a power supply, active power emitted by the power supply returns to the power supply, a power supply capacity requirement is reduced at the most; the valve modules of the invention are selected from an actual engineering, a test circuit operation principle and a control strategy have high similarity with MMC in the actual engineering, and necessary effective valve operational reliability investigation means and control strategy verification environment are provided for the MMC before investing in practical application.

Description

Technical field: [0001] The invention belongs to the field of power system and power electronics, and in particular relates to a back-to-back test method for a steady-state operation test of a flexible DC transmission MMC valve. Background technique: [0002] With the gradual application of flexible direct current transmission (VSC-HVDC) technology in power systems, the reliability of its core component, the high-power insulated gate bipolar transistor (IGBT) valve, has become one of the key factors for power system safety. VSC-HVDC based on modular multilevel converter (MMC) is a new technology for DC transmission using IGBT valves. The sub-module (SM) is the smallest power unit that constitutes the MMC, and it consists of a half-bridge (or H-bridge) composed of IGBTs connected in parallel with capacitors. Several sub-modules are connected in series to form an MMC valve assembly, which can reflect the electrical characteristics of the MMC valve in proportion. It is the bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCH02M2007/4835H02M7/4835
Inventor 查鲲鹏高冲罗湘
Owner CHINA ELECTRIC POWER RES INST
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