基于动态一致性的分布式微源并联控制方法

摘要

Traditional droop control could not easily and reasonably allocate the output power to parallel micro-sources due to different influencing factors,such as line impedance,local load,etc.A strategy of distributed control based on the dynamic consistency is proposed for the reactive-power allocation of microgrid in islanding mode,which adopts the low-bandwidth communication to realize the information exchange between adjacent micro-sources.Based on the local information and the information of adjacent micro-sources,each micro-source estimates the mean reactive-power of microgrid according to the dynamic consistency agreement.Integrator is applied to adaptively adjust the voltage bias of "reactive power"-"voltage droop" characteristic curve to ensure that the reactive-power output is allocated to parallel micro-sources according to the capacity ratio.Different operating conditions of microgrid in islanding mode are simulated and comparatively analyzed,which verifies the correctness and effectiveness of the proposed control strategy.%受线路阻抗、本地负荷等因素影响,传统下垂控制方法难以实现并联微源输出功率的合理分配.针对微电网孤岛运行模式下的无功功率分配问题,提出一种基于动态一致性的分布式控制方法,利用低带宽通信方式实现相邻微源间信息的交换,各微源利用其本地信息与相邻微源的信息通过动态一致性协议对微电网中无功功率的均值进行估计,再利用积分器的作用自适应调节无功-电压下垂特性曲线的电压偏置,保证并联微源输出的无功功率按照容量比分配.对微电网孤岛模式下不同的运行工况进行仿真与对比分析,验证了所提控制策略的正确性和有效性.