A steady-state test device and method for a modular multilevel converter valve

A modular multi-level, test method technology, applied in the direction of measuring devices, circuit breaker testing, measuring electricity, etc., can solve the problem of incomplete reproduction of modular multi-level converter valves, load reactor current AC component current DC The component cannot be controlled separately, and achieve the effect of simple circuit structure, low cost, and small current harmonic content
CN108279378BActive Publication Date: 2022-03-18CHINA EPRI ELECTRIC POWER ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA EPRI ELECTRIC POWER ENG CO LTD
Publication Date
2022-03-18

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Abstract

The invention provides a steady-state test device and method for a modular multi-level converter valve. The device includes a load reactor, a sample valve, an auxiliary valve, a water cooling device, a DC power supply, a control device and a protection device, and the reactor The AC component of the current and the DC component of the current can be controlled separately, and the structure of the steady-state test circuit is simple. The steady-state test method provided by the present invention realizes modularization by unlocking or locking the auxiliary valve and the sample valve during the charging stage and the test stage, and charging the supporting capacitors in the auxiliary valve and the sample valve at different stages. Steady-state test of the level converter valve; the present invention only charges and supplements the support capacitor in the auxiliary valve through the N output interfaces provided by the DC power supply, and does not need to separately set up another DC power supply for the test valve. The charging of the supporting capacitor makes the cost of the whole test circuit lower, and the invention can fully reproduce the actual operating conditions of the modularized multilevel converter valve.
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Description

technical field

[0001] The present invention relates to Background technique

[0002] Compared with AC transmission and traditional DC transmission, flexible DC transmission has unique advantages in operation performance. With the continuous development of modular multi-level flexible DC transmission converter valve technology, the construction of flexible DC transmission projects and flexible DC transmission networks is also accelerating. As one of the core equipment of modular multi-level flexible direct current transmission, the performance of the flexible direct current transmission converter valve determines the operation reliability and stability of the flexible direct current transmission system. The reliability of valves (ie, modular multilevel converter valves) has become one of the necessary measures to ensure the reliability of HVDC flexible transmission systems.

[0003] The smallest functional unit of a modular multilevel converter valve is a sub-module. There...

Claims

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