Starting method of modular multi-level flexible direct-current transmission converter
A flexible DC power transmission, modular multi-level technology, applied in output power conversion devices, electrical components, etc., can solve the problem of intensifying the internal dependence of valve control system hardware, high control system resource consumption, and poor operability, etc. problems, to achieve the effect of simplifying the starting method, reducing requirements, and ensuring consistency
Active Publication Date: 2013-03-13
XJ ELECTRIC +1
4 Cites 29 Cited by
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The invention relates to a starting method of a modular multi-level flexible direct-current transmission converter. The method comprises the following steps: realizing switch between soft start and a normal operating circuit through on-off of a circuit breaker and a line contactor; in the soft start process, cutting off the highest direct current voltage of a sub module at a certain frequency to ensure even charge of a bridge arm sub module; and ensuring that the voltage of the bridge arm sub module reaches a system operational rated value by selecting the cutting number of the sub modules so as to create condition for the system for smooth switch from the soft start process to the control mode. A single bridge arm in the control stage is used as a unit control unit, and even charge control of the sub module is carried out for each bridge arm at the same time. Thus, charging is easier to realize without detecting the current of the bridge arm. The soft start process is remarkably shortened, and the even charging degree of the sub modules is very high.
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