The current source photovoltaic grid-connected inverter has the advantages such as unipolar boost and continuous input current, but the LC filter on the AC-side has a resonance peak issue, which seriously affects the stable ability of the system. Therefore, research was first conducted on various damping methods. By utilizing the amplitude-frequency characteristic curves, the damping method with the optimal suppression effect on resonance peaks was obtained and converted into an active damping approach. Subsequently, research was conducted on the dual closed-loop control system and parameter design method for grid-connected current. Finally, a simulation model was established on the Simulink platform of Matlab to verify the feasibility and correctness of the resonance characteristic analysis and the proposed active damping dual closed-loop control strategy through simulations. The results show that the control system has no steady-state error, and dynamic response time below 10 ms and no overshoot.
关键词
电流源型逆变器/谐振尖峰/有源阻尼/控制系统
Key words
current source inverter/photovoltaic/resonance/active damping
维普
万方数据