配电网主动闭环运行经济性分析

Economical Analysis of Distribution Network Closed-loop Operation

传统单馈线辐射状配电网将无法满足分布式电源的接入和用户对供电高可靠性的要求。分析了基于通信和电力电子技术,配电网主动闭环运行的可行性;提出了基于Zbus法的含分布式电源和环网的配电网潮流计算方法。通过2个算例分析配电网闭环运行的经济性,对于双馈线手拉手配电线路,两端电压相角差对闭环运行网损影响较大,当相角差不太大时,闭环运行是经济安全的;与配电网的重构相比,闭环运行对降低网损和提高电压质量效果明显。

With the distributed generation increasingly integrating to the grid, the traditional single feeder radial distribution network becomes unsuitable. Based on the communication and power electronic technology, the feasibility of distribution network closed-loop operation is analyzed. Based on the Z-bus method, the power flow calculation method for the distribution network with distributed generation and rings is proposed. The economy of distribution network closed-loop operation is analyzed. For the hand in hand double feeder distribution network, the voltage phase angle difference has great influence on the loss of closed-loop operated distribution network. When the difference is not too big, closed-loop operation is economic and security. Compared with the reconstruction of distribution network, the closed-loop operation decreases network loss and improves voltage quality more obvious.