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Power loop test method for steady-state operation test of flexible direct current power transmission MMC (Modular Multilevel Converter) valve

A flexible DC transmission and test method technology, applied in the field of power system and power electronics, can solve the problems of high current, difficult full-load circuit test, high voltage, etc., to meet the requirements of reducing power supply capacity, reducing switching frequency, high equivalent sexual effect

Active Publication Date: 2012-01-18
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 in the test environment that is the same as the actual operating condition for testing

Method used

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  • Power loop test method for steady-state operation test of flexible direct current power transmission MMC (Modular Multilevel Converter) valve
  • Power loop test method for steady-state operation test of flexible direct current power transmission MMC (Modular Multilevel Converter) valve
  • Power loop test method for steady-state operation test of flexible direct current power transmission MMC (Modular Multilevel Converter) valve

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] The principle diagram of the power ring type MMC valve steady-state operation test circuit provided by the present invention is as follows figure 2 As shown, the entire test circuit is composed of valve components 1 and 2, charging power supply E1, energy supplementary power supply E2, load reactor L, charging current limiting resistor Rc and isolation switches K1 and K2;

[0038] The low-pressure output end of valve assembly 1 is directly connected to the low-pressure output end of valve assembly 2 and then grounded, and the high-voltage output ends of the two are connected through the load reactor L; wherein, valve assembly 1 is an auxiliary valve; valve assembly 2 is a test product valve.

[0039] Valve assemblies 1 and 2 respectively contain n and m submodules; and n≥m, m is the number of submodules contained in a valve...

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Abstract

The invention relates to a power loop test method for a steady-state operation test of a flexible direct current power transmission MMC (Modular Multilevel Converter) valve. The method comprises the following steps of: setting voltage amplitudes V1 and V2 of valve banks 1 and 2 and phase difference delta of the two voltage amplitudes and setting output voltage of an energy replenishing power source E2; closing an isolating switch K1 and charging a sub-module capacitor by a charging power source E1; cutting off K1 to exit E1 to finish pre-charging after the voltage of the sub-module capacitor reaches a set value; closing an isolating switch K2 and switching to the energy replenishing power source E2; meanwhile, sending out trigger pulses of IGBTs (Insulated Gate Bipolar Translator) of all sub-modules of the two valve banks according to a modulation strategy and getting a circuit in a steady-state running state; establishing voltage stress required by test at the two ends of the valve banks 1 and 2, performing energy exchange on sub-module capacitors and load reactors of two valve components and generating current stress required by the test in a loop; and cutting off K2 and exiting E2, latching the trigger pulses of the IGBTs in the sub-modules and finishing the test. The test method is simple and flexible; and a test parameter adjustment method is simple and convenient.

Description

technical field [0001] The invention belongs to the field of power system and power electronics, and specifically relates to a power loop 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. 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. Therefore, how to construct an equivalent test circuit in the test environment and conduct a test that is equivalent to the actual operating conditions becomes the key to solving the problem. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCH02M2007/4835H02M7/4835
Inventor 高冲吴亚楠罗湘查鲲鹏
Owner CHINA ELECTRIC POWER RES INST
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