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发明公开
CN106099968A 海上风电场直流输电系统直流短路故障穿越方法和系统 无效 - 驳回

海上风电场直流输电系统直流短路故障穿越方法和系统
摘要：
本发明涉及海上风电场直流输电系统直流短路故障穿越方法和系统，当直流母线出现短路故障时，首先检测直流母线两端的电流差，并比较直流母线两端的电流差与一个设定电流值的大小：当直流母线两端的电流差小于设定电流值时，根据直流母线两端的电流差来相应调节两个换流站的直流电压给定值；当直流母线两端的电流差大于或者等于设定电流值时，控制两个换流站的直流电压给定值为零。通过不同的故障程度来对两个换流站的直流电压进行相应地控制，所以，该故障穿越方法适合于海上风电场通过柔性直流接入电网的场合。
摘要（英）：

The invention relates to an o offshore wind farm direct current power transmission system direct current short circuit fault ride-through method and a system thereof. When a short circuit fault of a direct current bus occurs, a current difference between the two ends of the direct current bus is detected, and is compared with a set current value. When the current difference between the two ends of the direct current bus is smaller than the set current value, direct voltage set values of two converter stations are adjusted according to the current difference between the two ends of the direct current bus. When the current difference between the two ends of the direct current bus is greater than or equal to the set current value, the direct voltage set values of the two converter stations are zero. The direct voltages of the two converter stations are correspondingly controlled according to different fault degrees, and therefore the fault ride-through method is suitable for occasions where an offshore wind farm is connected a power grid by flexible direct current.

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