新能源采用柔直电网送出功率盈余问题解决方案

Solution for Power Surplus of Flexible DC Grid Transmission on New Energy

张北柔性直流电网工程采用真双极接线,在单极故障后,非故障极转带故障极部分或全部损失的功率时,可能造成功率盈余问题。经比较后,推荐在送端换流站装设交流耗能装置,通过投入交流耗能装置消耗盈余功率,使非故障极正常工作,再有序切除风机,确保孤岛方式下的交流侧电网平衡,保障柔直电网的安全稳定运行。

This paper points out that Zhangbei Flexible DC grid project with true bipolar wiring,when happens a unipolar fault,part or all lost power will turn to the non-faulty poles,may cause power surplus problems.After comparison,recommends AC chopper installing at the converter stations.AC chopper is used to consume the surplus power to make the non-faulty poles work normally,and then the fans are removed in an orderly manner to ensure the balance of the AC-side power grid in the island mode,and guarantee the safety for Flexible DC grid.