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电网技术  2012 

柔性直流输电的动态电流限幅控制

, PP. 135-139

Keywords: 电压源变流器型高压直流输电系统,串级控制,离散化,最小差拍,动态限幅

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Abstract:

在柔性直流输电系统的控制中,对输出电流的限幅通常是建立在功率开关通流能力上的稳态限幅,而没有考虑各种状态量对电流的实时影响。在柔性直流输电系统状态方程的基础上,通过求解状态量的离散化表达式,可以对下一状态电流范围进行实时预测,获得电流的动态限幅值。在柔性直流输电系统的双环控制系统中,对电流目标值加入动态电流限幅环节,可以保证内环的最小差拍控制,减弱两个控制环之间的冲突。通过对柔性直流输电系统进行接收电网低电压穿越的仿真,仿真显示有动态电流限幅可以大大减小系统在故障后的波动和恢复时间。说明动态电流限幅对提高控制系统动态响应速度有明显效果。

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