不平衡电网电压下的PWM整流器预测电流控制

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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.

Key words： PWM rectifier unbalanced grid voltage new reactive power predictive current control

Published: 03 March 2016

PACS:

TM46

Fund:国家自然科学基金（51577003、51207003、51347004）和北京市科技新星计划（XX2013001）资助项目

Corresponding Authors: 张永昌男,1982年生,博士,研究员,硕士生导师,主要研究方向为电力电子变换器、电机控制和新能源发电。E-mail: zyc@ncut.edu.cn

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	Zhang Yongchang
	Peng Yubin
	Qu Changqi

Cite this article:

Zhang Yongchang,Peng Yubin,Qu Changqi. Predictive Current Control of PWM Rectifier under Unbalanced Grid Voltage Condition[J]. Transactions of China Electrotechnical Society, 2016, 31(4): 88-94.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I4/88

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