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A Novel Control Strategy of PWM Rectifier with LCL Filter Under Unbalanced Grid Condition

本站小编 哈尔滨工业大学/2019-10-23

A Novel Control Strategy of PWM Rectifier with LCL Filter Under Unbalanced Grid Condition

Ke-Wei Cai, Ning-Hui Wang, Guo-Feng Li

(Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024,China)



Abstract:

The paper presents a successful design and good result of grid voltage feed-forward control strategy with no damping regulator of LCL filter applied in Three-phase Pulse Width Modulation(PWM) rectifier under unbalance grid condition for renewable energy processing. It is demonstrated that the closed-loop current control is decoupled with the grid voltage feed-forward control, and good waveform of grid current with low order harmonics is obtained under unbalance grid condition. This novel strategy is simple and reliable, applied with PI regulator but no resonant controller in α, β two-phase stationary frame. Moreover, the results of experiment and simulation are also illustrated to validate the novel strategy well applied in the closed-loop current control system under unbalanced grid condition.

Key words:  LCL filter  no damping control  grid voltage feed-forward control  renewable energy processing

DOI:10.11916/j.issn.1005-9113.2014.01.013

Clc Number:TM92

Fund:


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