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发明公开
CN104065287A 一种电压源型对称双极换流器的平衡控制方法 无效 - 驳回

一种电压源型对称双极换流器的平衡控制方法
摘要：
本发明涉及一种电压源型对称双极换流器的平衡控制方法，分别对正极换流器和负极换流器进行控制；增加中性线电流闭环控制：以对中性线电流为零为控制目标，以中性线电流采样值为反馈，进行PI控制；中性线电流闭环控制的输出，用于与正极和/或负极控制中有功功率相关控制的指令进行叠加。本发明的一种电压源型对称双极换流器的平衡控制方法，通过平衡控制闭环，给定中性线电流指令为零，通过与采样值做差进行PI控制，实现中线电流的闭环控制。避免了大地回线运行的危害，对于金属回线型式的系统，采取本发明的平衡控制能够降低换流器系统损耗。
摘要（英）：

The invention relates to a balance control method for voltage source type symmetric bipolar converters, which controls an anode converter and a cathode converter respectively; neutral current closed-loop control, which takes zero neutral current as a control target and adopts a neutral current sampling value as feedback to perform PI control, is added; the output of the neutral current closed-loop control is used for overlapping commands of active power related control in anode and/or cathode control. The balance control method for the voltage source type symmetric bipolar converters provided by the invention presets a neutral current command to be zero through the balance control closed-loop, and achieves closed-loop control of the neutral current through PI control by making difference with the sampling value. The harm of ground loop operation is avoided; and as for a metal loop type system, by adopting the balance control method provided by the invention, converter system loss can be reduced.

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