Due to unbalanced distribution of line impedance, the islanded microgrid based on droop control needs secondary control to realize optimal control of power and voltage. The conventional secondary control is usually implemented by MGCC. But because of the central nodes, its reliability and scalability are not desirable. In this paper, a distributed secondary control scheme based on P2P network is proposed. The optimal control of power and voltage can berealized by neighbor communication with limit information through discrete consensus algorithm. Since there are no central controllers, the reliability and flexibility of the control is improved significantly. The microgrid model is built in Simulink while the distributed scheme is developed in JADE platform. Simulation results have verified the novel scheme. The influence of communication delay is studied in detail, and the network topology is optimized for reducing the impacts of time delay.%由于线路阻抗分布不均,基于下垂控制的孤岛型微电网需要引入二次调节手段以实现电压及功率的优化控制.传统的二次调节常通过微电网中心控制器(MGCC)实现,但由于存在中心节点,系统的可靠性及可扩展性差.本文提出了一种基于对等稀疏网络的分布式二次调节策略,该策略利用离散一致性算法,仅通过与邻居节点间的有限通信实现分布式单元功率均分及系统平均电压的调节.由于控制节点间完全对等,不存在中心控制器,增加了控制的可靠性及灵活性.利用Matlab/Simulink搭建孤岛型微电网,在JADE平台上开发分布式二次调节策略,联合仿真所提策略的有效性,并与已有集中式、自治式策略进行对比.详细分析通信延时对策略的影响,对通信网络拓扑结构进行多目标优化,根据延时的抗干扰能力选择最优拓扑结构.
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