Active damping control of single-phase grid-connected photovoltaic inverter based on filter

作者：Zhang, Ning Yun; Tang, Hou Jun^*; Yao, Chen

来源：Journal of Shanghai Jiaotong University, 2015, 49(4): 429-435 and 441.

DOI：10.16183/j.cnki.jsjtu.2015.04.004

• Composite controllers
• Grid connected inverters
• Grid-connected photovoltaic inverters
• High sampling frequencies
• LCL filters
• Proportional resonant controllers
• Single phase grid connected inverters
• Stability analysis

Based on the mathematical model of the single-phase grid-connected inverter with LCL filter in discrete domain, the stability of the whole system was deeply investigated, considering the relationship between the sampling frequency and the resonant frequency of the LCL filter. The reason for the instability of the sampling frequency which is less than, equal to, and higher than the critical frequency, is discussed. The methods to reform the characteristics of the system were proposed. Two different digital filters were introduced to construct composite controller with the proportional resonant(PR) controller, and the system characteristics from the amplitude and phase was reformed respectively, making the whole system stable under low, medium and high sampling frequency with the composite controller. The validity of the analysis was assessed by both the numerical simulation and experimental results.

• 出版日期2015
• 单位上海交通大学