Method for connecting convertor station into multiport flexible direct current transmission system in a live manner
A DC transmission system, multi-terminal flexible technology, applied in the direction of power transmission AC network, etc., can solve the problems of synchronous power grid paralysis, cumbersome operation, AC line overload, etc., and achieve the effect of simple implementation, reliable operation and mature technology
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[0020] The multi-terminal flexible DC transmission system involved in the method of the present invention includes four converter stations, such as image 3 As shown, three of the converter stations 1, 2 and 4 form a three-terminal flexible DC transmission system that is operating stably, and one of the converter stations 3 needs to be connected to the system.
[0021] The method for connecting a converter station to a multi-terminal flexible DC transmission system with power provided by the present invention includes the following steps:
[0022] (1) Block the converter stations to be connected to the grid in the multi-terminal flexible DC transmission system; at this time, converter station 3 can only be charged but not discharged;
[0023] (2) Close the AC circuit breaker between the converter transformer in the converter station to be connected to the grid and the AC system. The AC system performs uncontrolled rectification charging on the converter station. After the charging is ...
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