A double closed-loop control of VIENNA rectifier based on sliding-mode of fuzzy approaching law

[摘要] A novel double closed-loop control of VIENNA rectifier based on sliding-mode of fuzzy approaching law is proposed in this paper. This new control strategy improves dynamic response and steady accuracy of system, chattering phenomenon of the sliding-mode is eliminated. Combined with sliding-mode and fuzzy approaching law, a new type of inner loop power control is proposed to replace traditional current inner ring. Without coordinate transformation and phase-locked-loops(PLL), control algorithm is simple. Under unbalanced three-phase power grid, output voltage still maintains small voltage ripple, network side harmonic suppression and dynamic response perform well. Sliding-mode based on fuzzy approaching law can eliminate the chattering phenomenon of the system, the overshoot produced by load transition can be reduced. The outer ring adopts voltage PI control with real time current compensation, dynamic response performs good and the control algorithm is simple.

[发布机构] School of Automation, Wuhan University of Technology, 205 Luoshi Road, Hongshan District, Wuhan; 430070, China^1;School of Automation, Wuhan University of Technology, Wuhan; 430070, China^2

[效力级别] 电工学

[关键词] Chattering phenomenon;Co-ordinate transformation;Control strategies;Current compensation;Double closed-loop control;Harmonic suppression;Inner-loop power control;Phase Locked Loop (PLL)