基于DG输出电流控制的配电网降损研究

Research on Reduction of Distribution Losses Based on the Current Output Control of Distributed Generation

通过对负荷均匀分布辐射状链式配电网络进行理论分析,推导出分布式电源(distributed generation,DG)接入配电网后,主干线电流和节点电压的表达式。设DG输出电流与节点负荷电流存在k倍关系,推导出了含负荷电流的线损和电压偏移表达式,求得以线损最小为目标函数的k值及DG输出电流,且经验证所得k值满足系统对节点电压偏移的要求。通过算例分析,证明所提方法能通过确定DG输出电流的数值大小降低配电网线损、改善配电网节点电压。

This paper analyzes the network theory of the uniform load distribution,derive the expression of trunk line current and node voltage after distributed power（distributed generation,DG）connected to distribution network.On the premise that the DG output current is ktimes as much as the load current,further derive the expression of net loss and voltage offset included with load current,then determine k and the DG output current to minimize the network loss.By analyzing an example show that the proposed control method can realize operation optimization of distribution network and reduce network loss,improve the node voltage by determine the value of the DG output current.