Multiple-Loop Digital Control Method for a 400-Hz Inverter System Based on Phase Feedback
Multiple-Loop Digital Control Method for a 400-Hz Inverter System Based on Phase Feedback
复制标题
基于相位反馈的400Hz逆变系统多环数字控制方法
DOI：
10.1109/tpel.2012.2188043
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发表时间：
2013-01-01
影响因子：
6.7
通讯作者：
Tan, Da-peng
中科院分区：
文献类型：
--
作者：
Li, Chen;Ji, Shi-ming;Tan, Da-peng
为了保证逆变电源的相位平衡，提高输出电压质量，提出了一种基于单极性正弦脉宽调制（SPWM）的400 Hz逆变电源多环控制系统。分析了三相组合式逆变电源系统中相位不平衡产生的原因，提出了一种基于相位控制的多环控制策略来消除相位不平衡，并在该控制策略中加入单极性SPWM，以降低大功率逆变器输出的总谐波失真（THD）。讨论了驱动电路和缓冲电路的设计，以消除死区效应和电压振荡。对控制系统的稳定性进行了分析，并利用数字信号处理技术实现了电力系统和控制策略。对比仿真结果表明了该控制器的优越性和正确性。构建了一种基于多环控制策略的三相组合式逆变器系统，实验结果表明，该逆变器系统可使各相之间的相位差小于2 °，输出电压的总谐波失真（THD）可控制在2%以内。
To keep phase balance and improve output voltage quality, a novel multiple-loop control system in 400-Hz inverter power supply based on unipolar sinusoidal pulse width modulation (SPWM) is proposed. The causes of phase imbalance in a three-phase combined inverter power system are analyzed, and a new multiple-loop control strategy based on phase control is presented to eliminate it. For reducing the total harmonic distortion (THD) of high-power inverter output, unipolar SPWM is added with this new control strategy. The designs of drive circuit and snubber circuit are discussed to eliminate dead time effects and voltage oscillation. The stability of the control system is analyzed and the power system and the control strategies are realized with digital signal processing. Contrastive simulation results indicate the advantages and the correctness of this novel controller for inverter. A three-phase combined inverter system based on a multiple-loop control strategy is constructed, and experimental results show that the inverter system can make a phase difference between each phase less than 2 degrees, and the THD of output voltage can be controlled within 2%.