基于Newton-Raphson法的孤岛微网三相潮流计算

Three-Phase Power FlowCalculation for Isolated Island Microgrid Based on Newton-Raphson Method

对于孤岛运行的微网而言,正确分析系统状态和分布式电源的工作方式非常关键,所以高效精确的潮流计算显得尤为重要。提出在分布式电源工作于下垂控制模式的情况下,基于Newton-Raphson法的孤岛微网三相潮流计算方法,并简化了潮流方程,提高了计算效率。在此基础上,还考虑了分布式电源无功越限问题。最后在25节点三相不平衡的微网算例中验证了本文方法的正确性,将其结果与牛顿信赖域法进行比较。最后指出,本文的潮流计算方法具有较高的精度和效率,可作为进一步研究的基础。

The correct analysis of system state and the working mode of distributed generation are very important to the microgrid in isolated island operation,so a fast power flowcalculation with high efficiency is very significant. Based on Newton-Raphson method,a three-phase power flowalgorithm was proposed for isolated island microgrid with distributed generation operating in droop control mode,whose power flowequation was simplified and computational efficiency was improved. On this basis,the limit problem of reactive power of distributed generation was also considered. Finally,the correctness of proposed method was verified in a mircogrid test system with 25-bus three-phase unbalance,whose results were compared with Newton trust region method. The results indicate that the proposed power flowalgorithm has high accuracy and efficiency,which can be used as the basis for further research.