Due to the existence of a large number of single-phase load and non-linear load at the point of common coupling (PCC) , islanded microgrids is prone to three-phase voltage unbalance and negative sequence current can-not be well shared among distributed generations (DGs).To solve this problem, under the analysis of unbalanced compensation and negative sequence current sharing mechanism, a voltage unbalance compensation and negative sequence current sharing control strategy based on dynamic consensus algorithm is proposed.In the distributed sec-ondary control level, real-time data exchange between the neighboring DGs is realized by distributed sparse commu-nication network.The dynamic consensus algorithm is used to evaluate the global average voltage and negative se-quence current, which adaptively regulates the voltage reference value and voltage unbalance compensation refer-ence vector of the droop control to achieve voltage unbalance compensation and negative sequence current sharing control.The control method not only compensates the voltage unbalance at point of common coupling, but also real-izes the negative sequence current sharing control due to distribution line differences between DGs.Finally, the simulation and experiments show that the proposed method is effective and feasible.%孤岛微电网中,由于公共耦合点(PCC)处存在大量单相负荷和非线性负荷,系统易出现三相电压不平衡及负序电流无法均衡分配问题.为此,在分析不平衡补偿与负序电流均衡机理的基础上,提出一种基于动态一致性算法的电压不平衡补偿及负序电流均衡控制策略.在分布式二次控制层中,通过分布式稀疏通信网络实现相邻的分布式电源间实时数据交换,采用动态一致性算法估算全局平均电压和平均负序电流,自适应调节电压不平衡补偿参考向量,以实现电压不平衡补偿和负序电流的均衡控制.该控制策略不仅实现了公共耦合点处电压不平衡补偿,还解决了分布式电源( DG)间因线路阻抗分布不均的负序电流均衡控制问题.最后,通过仿真与实验验证了所提方法的有效性和可行性.
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