Research on Voltage Coordinated Control Strategy of Multi-port Energy Router

Abstract

This paper takes the energy router with DC bus as the research object. Due to the needs of DC bus voltage stability regulation in the energy router, a voltage hierarchical coordinated control method using the droop control principle is proposed. The DC bus voltage of the system is divided into three layers. In different voltage control layers, grid connected unit, energy storage unit and photovoltaic unit are used as voltage sources to control bus voltage stability and power balance. This control method only needs each converter to control its own working state according to the local voltage signal, and does not need the communication line between the central controller and each converter, which can simplify the system structure. A simulation model is built in Matlab / Simulink to verify the proposed voltage hierarchical coordinated control strategy. The simulation results show that the control strategy can realize the stable operation of the energy router, and the operation modes of each converter can switch smoothly, which verifies the effectiveness of the control strategy.