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基于定有功电流限值控制的MMC型UPQC协调控制方法

, PP. 196-204

Keywords: 统一电能质量控制器,模块化多电平换流器,定电流限值,电压暂降,协调控制

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Abstract:

对电压暂降期间MMC型UPQC串联侧补偿能力进行深入的理论分析。首先给出MMC型UPQC的工作原理,推导出暂降补偿幅值、补偿持续时间、主回路电气量及MMC参数之间关系的时域表达式;进而提出一种针对容量确定情况下UPQC串联侧过电流问题的协调控制设计方法,在传统定直流电压控制的基础上提出定有功电流限值控制;定义了划分MMC型UPQC处于上述两种控制状态的电压暂降临界值并给出数值计算表达式;最后PSCAD/EMTDC下的系统仿真结果验证了理论分析的正确性。仿真结果也表明,与传统协调控制方法相比,该文提出的协调控制方法可明显提高电压暂降的补偿幅值和持续时间。

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