Journal of Physics: Conference Series | 2021
An Improved Quasi-Resonant Controller for Grid-Connected Inverter with LCL Filter
Abstract
Aiming at the problem of insufficient response speed of traditional quasi-resonant controllers in the application of grid-connected inverters with LCL filter, a novel hybrid controller which combines a quasi-proportional resonant controller and an integrator is proposed in this paper. Base on this controller, the stability, the parameter design and the digital time delay compensation of the system are analyzed and designed in detail. Finally, its effectiveness is experimentally verified at Matlab/Simulink. By comparing with the traditional control method, it leads to a conclusion that the novel hybrid controller can maintain the control accuracy while allowing the system have good dynamic performance.