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Negative Sequence Voltage Feed Forward Compensation Unbalanced Control Strategy for Three-Phase PWM Rectifier Based on One Cycle Control |
Xu You1, 2, Zheng Jianyong1, Mei Jun1, Yao Lei1 |
1. Southeast University Nanjing 210096 China 2. Nanjing Agriculture University Nanjing 210031 China |
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Abstract Considering solution to the control problem of three-phase pulse width modulation (PWM) rectifier under unbalanced input grid voltages, a negative sequence voltage feed forward compensation unbalanced control strategy for three-phase PWM rectifier based on one cycle control is proposed in this paper. The control strategy adopts only one DC voltage proportional integral(PI) controller to regulate the instantaneous active power to a constant value without any ripple. Therefore, the system control structure is simplified and extraction for positive and negative sequence components of grid currents is not needed any more. Simulation and experimental results indicate that the control system eliminate the second harmonic waves of DC voltage and harmonic waves of AC currents entirely. And the unbalanced performance of three-phase PWM rectifier is optimized greatly.
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Received: 19 July 2011
Published: 20 March 2014
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