基于滑模策略的微网逆变器负载侧电压-功率自协调控制系统设计

The uncertainty of load-side grid-connected/off-grid operation state of micro-grid seriously affects the output state configuration and hardware security of micro-grid inverters. In order to enhance the self-coordinated output capability of the inverter output state and simplify the complexity of multi-mode control systems，a voltage-power self-coordinated control system based on sliding mode control（SMC）is designed in this paper. Firstly，the power transmission model of the micro-grid inverter is established. Based on the analysis of output voltage characteristics under active/reactive power constraints，a virtual compensation voltage is introduced to construct the voltage-power self-coordination control relationship. Then，the SMC strategy is used to realize the function of each module within the control system，and the stability of SMC control law is analyzed. Finally，simulation under different working conditions are designed to analyze and verify that the proposed control system can self-coordinate the inverter output voltage-power state according to the operating state of the load side under the limitation of the maximum output power of the inverter，and effectively reduce the response time and output steady-state error of the system while meeting the power demand of the load side.