Fault protection method for steady-state operation testing apparatus of modular multilevel converter (MMC) valve

A test device and fault protection technology, which is applied in the field of power electronics, can solve problems such as the lack of corresponding protection measures for the test device and the adverse effects of the test device, achieving strong operability and flexibility, ensuring sensitivity and reliability, and clear logic Effect

Active Publication Date: 2013-04-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] When the steady-state operation test is carried out, there are no corresponding protection measures for various faults in the test device

Method used

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  • Fault protection method for steady-state operation testing apparatus of modular multilevel converter (MMC) valve
  • Fault protection method for steady-state operation testing apparatus of modular multilevel converter (MMC) valve
  • Fault protection method for steady-state operation testing apparatus of modular multilevel converter (MMC) valve

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[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] The schematic diagram of the MMC valve steady-state operation test device provided by the invention is as figure 2 As shown, the steady-state operation test device is composed of MMC auxiliary valve, MMC sample valve, current detection unit, voltage detection unit, load reactor, energy supplementary power supply, charging power supply and control system.

[0040] The supplementary power supply is connected to the MMC auxiliary valve through a smoothing reactor; the load reactor is connected between the MMC auxiliary valve and the MMC sample valve; the MMC auxiliary valve, the MMC sample valve and the charging power supply are sequentially connected in parallel;

[0041] The control system includes an upper computer, a valve base controller VBC and a main controller; the valve base controller VBC, the main control...

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Abstract

The invention relates to a fault protection method for steady-state operation testing apparatus of a modular multilevel converter (MMC) valve. The fault protection method selects one protection mode according to fault types. The fault types include earth fault, energy complementing power fault, valve fault and communication fault. When the earth fault occurs, insulated gate bipolar translator (IGBT) driving protection of an MMC auxiliary valve or an MMC sample valve is used as main protection and over-current detection of a main controller is used as backup protection. When the energy complementing power fault occurs, a protective measure I or a protective measure II is carried out, the energy complementing power gives an alarm and reports the fault or abnormality to an upper computer. When the valve fault occurs, the protective measure I is carried out, trigger pulse of the MMC auxiliary valve or the MMC sample valve is shut. When the communication fault occurs, the protective measure I is carried out and fault is reported to the upper computer. By means of the fault protection method, fault types are recognized and all the faults are graded, all kinds of protection are arranged in different levels and are matched with one another, and thus rapidity of protecting actions is ensured and fault removal of the testing device is benefited.

Description

technical field [0001] The invention relates to a protection method in the field of power electronics, in particular to a fault protection method for an MMC valve steady-state operation test device. Background technique [0002] Flexible direct current transmission (VSC-HVDC) technology has broad application prospects in the field of high-voltage direct current transmission. VSC-HVDC based on modular multilevel converter (MMC) is a way to realize direct current transmission using IGBT valves , and its core component is called MMC valve. The electrical structure of the MMC valve is as follows: figure 1 shown. [0003] The purpose of the steady-state operation test of the MMC valve is to investigate the tolerance of the valve assembly to key stresses such as current, voltage and temperature under long-term actual operating conditions, which is also an important part of the research on the reliability of the converter operation. [0004] When the steady-state operation test ...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCH02M1/32G01R31/3275H02M2007/4835H02M1/325H02M7/4835
Inventor 汤广福查鲲鹏罗湘高冲吴亚楠
Owner STATE GRID CORP OF CHINA
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