Distributed Cooperative Control of Multiple DC Electric Springs for Voltage Regulation in DC Microgrid

Distributed electric springs can achieve voltage regulation and power quality improvement in DC microgrid with high penetration of renewable energy sources. However, the distributed installation of multiple DC electric springs (DCESs) make coordinated control difficult. In this paper, a simple distributed coordinated control framework is proposed for multiple DCESs. The primary control is based on model predictive control (MPC) to coordinate multiple DCESs. The switch combination of DCES with the operation mode is corresponded in the MPC controller. The secondary control adopts consensus algorithm to regulate the voltage reference value of DC bus. With the design, the distributed coordinated control can achieve the coordinated operation of multiple DCESs and DC bus voltage management by using local information and neighbors' information. Finally, the simulation results based on MATLAB/Simulink verify the correctness and feasibility of the proposed method.