Abstract：Conventional predictive current control (PCC) for PWM rectifiers can achieve good steady state and dynamic response under ideal grid voltage conditions, which features fixed switching frequency, quick dynamic response and low harmonics. However, under unbalanced grid voltage conditions, conventional PCC has the problems of current distortion, power oscillation and dc-bus voltage ripple. Based on a novel instantaneous power theory, this paper proposes an improved PCC strategy that is effective under both ideal and unbalanced grid voltage conditions. The control aim is to achieve sinusoidal grid currents and eliminate twice grid frequency oscillations in active power. After deriving the analytical current reference, the converter voltage vector reference in the next control period is obtained based on the principle of deadbeat current control, which is subsequently synthesized using space vector modulation (SVM). Compared to the existing solutions, the proposed PCC does not require the complex sequence extraction or power compensation algorithm. It can effectively reduce the power oscillation and current harmonics. The effectiveness of the proposed method is confirmed by both simulation and experimental results.
张永昌, 彭玉宾, 曲昌琦. 不平衡电网电压下的PWM整流器预测电流控制[J]. 电工技术学报, 2016, 31(4): 88-94.
Zhang Yongchang, Peng Yubin, Qu Changqi. Predictive Current Control of PWM Rectifier under Unbalanced Grid Voltage Condition. Transactions of China Electrotechnical Society, 2016, 31(4): 88-94.
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2016, Vol. 31 
