Hybrid Damping Strategy for Single-Phase Grid- Connected Photovoltaic Inverter Under The Control of PDFI
One of the key operation of the grid-connected PV system is a fast and accurate control of the grid current,but the traditional proportional integral (PI) control of the grid current can not achieve this important goal because of its steady-state error.In addition,after the PV system is incorporated into the grid, the influence caused by grid inductance has a non-negligible effect on the damping strategy of the LCL filter.In order to solve the problems mentioned above, a hybrid damping strategy for single-phase PV grid-connected inverter under the control of PDFI is presented in this paper.This strategy introduces a proportional delay feedback integral (PDFI) control, which is based on the original PI control and can realize the control of the grid current without steady-state error due to the simple feedback circuit.Meanwhile,taking damping coefficient as object,the hybrid damping strategy has a good improvement effect on the grid inductance. The results of the theoretical analysis and Matlab simulation both show that ,under this control strategy ,the system can run stably, the grid current can be controlled accurately,and the damping strategy of the LCL filter has good adaptability to the grid inductance.
PV grid-connected inverter PDFI steady-state error LCL filter hybrid damping strategy
Yang Qiuxia Li Kun Wang Hu
College of Electrical Engineering Yanshan University Qinhuangdao,China
国际会议
秦皇岛
英文
1625-1630
2015-09-18（万方平台首次上网日期，不代表论文的发表时间）