考虑分布式电源的弱环配电网潮流计算方法

Power Flow Calculation Method for Weakly Looped Distribution Network with Distributed Generations

我国配电网络一般采用"闭环设计、开环运行"的供电方式。但在配电网实际运行中,配电网中的联络开关或分段开关有时需要闭合形成弱环网,因此需要考虑弱环网潮流问题,提出了一种基于前推回代法的辐射状潮流计算方法,利用叠加原理处理环网回路,使弱环配电网等效为辐射型网络以及端口补偿电路。随着分布式电源DG(distributed generation)的大量加入,在潮流计算中也要予以考虑。研究了不同类型分布式电源在潮流计算中的处理方法。最终给出了含分布式电源的弱环配电网潮流计算方法,并用IEEE 33节点算例对算法进行了验证。

In China,distribution networks generally adopt a power supply mode with closed-loop design and open-loop operation.However,in their actual operation,sometimes the tie switch or section switch need to be closed to form a weakly looped distribution network.Therefore,the issue of power flow should be considered in this case.In this paper,a power flow calculation method for radial distribution system is proposed based on forward-backward sweep method.By utilizing superposition principle to deal with looped network circuit,the weakly looped distribution network is equivalently treated as a radial network and a port compensation circuit.The growing numbers of distributed generations(DGs)that are connected to distribution network should also be considered in power flow calculation,thus the processing methods for different types of DGs are studied in power flow calculation.Finally,a power flow calculation method for weakly looped distribution network with DGs is formulated,and it is further verified with an IEEE 33-node model.