A Distributed Scheme For Economic Optimization Operation And Voltage Recovery With Constant Power Loads(Cpls) In Dc Microgrids

A fully distributed control scheme is proposed to simultaneously realize optimized economic operation of the DC microgrid with constant power loads (CPLs) and voltage recovery of DC bus. Considering CPL characteristics, an economic dispatch problem is solved to minimize the total generation cost based on consensus algorithm by controlling the output powers of the dispatchable sources. Therefore, unlike traditional centralized control, the distributed control adopted in this paper can greatly reduce the communication cost and speed up dynamic response when the network scale is large. Considering the limits of the generations, the consensus algorithm can achieve economic optimal operation without measuring load changes. On the other hand, average voltage observers are introduced to compensate the voltage drop caused by droop control. Simulation results based on MATLAR/Simulink verify effectiveness of the proposed method.