A Grid Voltage Feed-forward Control Strategy Based on The Virtual Impedance
This paper initially investigates the conventional LCL filter grid-connected inverts system,which introduces the control strategy with inverter-side current feedback,and analyzes the deficiencies within the strategy.The stability of the controller can be improved by adopting the active damping scheme.However,the output current of the inverter is severely influenced by the external grid voltage distortion and the grid low-order harmonic voltage.In order to reduce this impact and gain high-quality power,a novel control strategy is proposed in this paper,in which the virtual complex impedance is introduced to feed grid voltage forward.By using the proposed control strategy,the total harmonic distortion can be greatly decreased,allowing the grid current to synchronize the reference current well.In addition,the modulation of the virtual complex impedance by controller can also quantificationally regulate the equivalent output impedance,which brings great convenience for inverters system designers to calculating and devising.Simulation results are presented to prove the validity and improvements achieved by the proposed controller.
Chu Wang Jin Wang Tian Qin Xuhui Liu Xiang Wu
School of Mechatronics Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China
国际会议
2017第三届机械、电子和信息技术工程国际会议(ICMITE 2017)
成都
英文
1-7
2017-12-16（万方平台首次上网日期，不代表论文的发表时间）