分布式电源并网的配电网改进潮流算法

分布式电源(DG)的并网,不可避免地对配电网运行和安全产生很大影响,因此必须对含DG的配电网潮流进行计算调整.在分析常见的几种DG基础上,给出它们各自在潮流计算中的模型以及处理方法,并提出一种改进型前推回代潮流算法,来计算含DG的配电系统潮流.考虑到前推回代法处理PV节点的能力较差,引入注入无功修正法.此外,分析PV节点型DG无功初值选取对潮流收敛性的影响,以及DG并网对系统电压和网损的影响.设计不同类型DG并网的测试方案,在IEEE 33节点配电网络中反复检验,结果表明该方法是有效的.

Modified Load Flow Calculation of Distribution Network with DGs

The integration of distributed generators(DGs) into a distribution network has a great impact on the operation and security of the network.So the adjustment of load flow algorithms for the distribution network has to be conducted.Based on the analysis of several widely used DGs,the calculation models and their processing methods were established.An improved forward/backward sweep algorithm was proposed for the load flow calculation of the distribution network.In order to overcome the inability of forward/backward sweep method in handling PV buses,an improved algorithm,namely injecting reactive power compensation,was introduced.Impacts on load flow convergence by the initial reactive value selection of PV buses,as well as the DG integration influences on network voltage profile and loss,were analyzed.Several testing schemes were designed for different types of DGs and applied repeatedly in the IEEE 33-bus distribution system.The test results verify the feasibility and effectiveness of the proposed algorithm.