Abstract：Precise design of controller parameters is helpful to improve system control performance in currents dual-loop active damping method of three-phase grid-connected inverter with LCL filter. As to its concrete topology, a system mathematical model is set up in the synchronous dq reference frame and a decoupling control is adopted. This paper focuses on the design method of currents dual-loop controller adopting expected frequency characteristics, as well as emphatically analyzes the impact on the system stability when the system's parameters change. This method could precisely calculate the parameters of inner and outer loop controller when system parameters are given, and some system performance and robustness can be obtained. Besides, this design method for controller not only can ensure stable and reliable operation of the three-phase grid-connected inverter with LCL filter, but also can obtain high quality grid-connected current. It is verified by the simulation and experimental results.
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2014, Vol. 29 
