微电网系统的分布式优化下垂控制

针对微电网系统运行成本最优化问题,提出一种分布式优化下垂控制策略.首先,基于一致性理论,给出了一种分布式经济调度算法.采用矩阵摄动理论,分析了经济调度算法的收敛特性.其次,基于分布式优化调度解,设计一种新的分布式优化下垂控制器.在满足供需平衡以及各个发电单元运行约束的条件下,控制策略使得微电网系统运行成本最低.同时,提出的控制策略能够保证孤岛微电网的频率稳定在额定值.最后,通过仿真实例,验证了分布式优化下垂控制策略的有效性.

Distributed optimal droop control in micro-grid systems

To optimize the operation cost of micro-grid systems, a distributed optimal droop control scheme is proposedin this paper. Firstly, based on the consensus theory, we present a distributed algorithm to solve the economic dispatchproblem in micro-grid systems. By virtue of matrix perturbation theory, the convergence property for the proposed economicdispatch algorithm is analyzed. Secondly, based on the distributed economic dispatch solution, an optimal droopcontroller is designed, which guarantees the supply-demand balance and satisfies the generation constraints of each unit.Moreover, the proposed control scheme can restore the frequency of islanded micro-grid to the nominal value. Finally, theeffectiveness of the proposed distributed optimal droop control scheme is verified by the simulation results.