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Control Design for Voltage Quality Improvement of Low Voltage Microgrid Using Back-to-Back Converter Connected to Distribution Network
Author(s): 
Pages: 171-181
Year: Issue:  4
Journal: Transactions of China Electrotechnical Society

Keyword:  微网 电压质量 不对称运行 背靠背变流器;
Abstract: 为消除配网不对称运行引起的微网电压不平衡,提出了一种采用背靠背变流器接入配网以改善低压微网电压质量的综合控制方案。基于二阶广义积分器推导坐标系n次谐波瞬时正负序分量分解算法;电网侧变流器采用V/控制维持直流母线电压恒定,电压外环引入虚拟电抗以提高低压阻性线路的调节性能,根据不平衡电压条件下变流器输出功率波动特性,增加内环负序电流补偿减小配网不对称运行时直流电压的倍频波动;微网侧变流器采用电压外环电流内环双闭环定V/f控制,加入负序和三次谐波电压控制环节有效消除了微网公共连接点的电压不平衡。采用PSCAD/EMTDC仿真验证了本文所提控制方案的正确性和有效性。
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