基于BFGS信赖域算法的孤岛微电网潮流计算  

Power Flow Calculation of Islanded Microgrids Based on BFGS Trust Region Method

作　　者：彭寒梅[1] 曹一家[1] 黄小庆[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082

出　　处：《中国电机工程学报》2014年第16期2629-2638,共10页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2012AA050217)~~

摘　　要：分散下垂控制策略的孤岛微电网,系统中没有平衡节点,多个下垂控制的分布式电源(distributed generator,DG)装置参与系统频率的调节并达到新的频率稳态值,传统配电网潮流计算方法将不再适用。针对分散下垂控制策略的孤岛微电网潮流计算,提出基于BFGS信赖域算法的潮流计算新方法。把DG装置处理为PQ节点、PV节点和下垂节点3种类型,建立下垂节点潮流计算模型;分析非线性节点功率方程组的求解,并将其转化为无约束最优化问题,再采用带BFGS修正的信赖域算法进行求解,得到系统稳态频率及各节点电压。对改造后的37节点孤岛微电网系统应用提出的方法进行潮流计算,验证了算法的正确性和有效性。The islanded droop control strategy does microgrid under decentralized not have a balance node, and several distributed generator （DG） units with droop controllers participate in the regulation of system frequency which finally reaches a new steady value, so the traditional distribution network power flow calculation methods can not apply to it. Aiming at power flow calculation of the islanded microgrid under decentralized droop control strategy, a new power flow calculation method based on BFGS trust region algorithm was proposed in this paper. DG units were taken as three node types of PQ node, PV node and droop node, and power flow calculation model of droop node was established. The solving of nonlinear node power flow equations was analyzed. Further, the solving of nonlinear equations was converted for a unconstrained optimization problem, and a trust region algorithm with BFGS correction was proposed for solving it so that system steady frequency and each node voltage were obtained. The proposed method was performed on 37-node islanded microgrid, and results testify the correctness and validity.

关 键 词：孤岛微电网 潮流计算 分散下垂控制策略 下垂节点 BFGS信赖域算法 无约束最优化问题 

分 类 号：TM74[电气工程—电力系统及自动化] TM61