三相四桥臂逆变器的非数字化控制策略

发布时间：2018-02-10 01:28

本文关键词： 三相四桥臂逆变器非数字化控制双闭环控制零序谐波不平衡负载　出处：《电工技术学报》2014年12期 　论文类型：期刊论文

【摘要】：三相四桥臂逆变器较成熟的控制策略都需依赖数字信号处理器来实现,但数字化控制的精确性受较多因素制约,其控制效果在一些场合并不理想。本文在分析了三相四桥臂逆变器数学模型的基础上,研究了一种三相四桥臂逆变器的非数字化控制策略,各相桥臂采用了改进的电压电流双闭环控制,通过加入谐振控制器提高逆变器的稳态精度,通过补偿零序谐波提高逆变器的输出正弦度和直流母线电压利用率;第四桥臂采用零序谐波电压PWM控制,保证了逆变器具有较强的带不平衡负载能力。仿真和实验验证了该控制策略具有方法简单、易于模拟电路实现、逆变器输出波形质量高、带不平衡负载能力强、动静态性能良好等优点。
[Abstract]:The more mature control strategy of three-phase four-leg inverter depends on digital signal processor, but the accuracy of digital control is restricted by many factors. The control effect is not satisfactory in some occasions. Based on the analysis of mathematical model of three-phase four-leg inverter, a non-digital control strategy of three-phase four-leg inverter is studied in this paper. The improved voltage and current double closed loop control is adopted in each phase bridge arm. The steady state precision of the inverter is improved by adding the resonant controller, and the output sinusoidal degree and the DC bus voltage utilization ratio are improved by compensating the zero sequence harmonic. The 4th bridge arm adopts zero-sequence harmonic voltage PWM control, which ensures the inverter has strong ability with unbalanced load. The simulation and experiment verify that the control strategy is simple, easy to be realized by analog circuit, and the output waveform of inverter is high quality. With unbalanced load capacity, dynamic and static performance is good and so on.
【作者单位】：南京邮电大学自动化学院;南京航空航天大学自动化学院;
【基金】：国家自然科学基金资助项目(51107057)
【分类号】：TM464

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