摘要
电网电压不平衡情况下的并联型PWM整流器控制策略是保证其安全稳定运行的关键技术。传统控制算法存在坐标变换运算量大、控制结构复杂、直流母线电压波动以及电网电流畸变等问题,为此提出了一种基于静止坐标系下的并联型PWM整流器控制策略,建立了电网电压不平衡情况下的数学模型,给出了抑制正序、负序和零序环流的基本原理,提出了直流电压外环采用比例积分谐振控制器和网侧电流内环采用比例反馈谐振控制器来消除直流母线电压波动和网侧电流谐波的控制方法,给出了PWM整流器并联运行的整体控制框图,设计了比例反馈谐振控制器参数。最后,通过仿真软件进行了仿真研究,仿真结果研究了所提出算法的可行性和有效性。
Control strategy of parallel PWM rectifier under unbalanced grid voltage is the key technology to ensure its safe and stable operation. Traditional control algorithm has many problems, such as large amount of coordinate transformation, complex control structure, DC bus voltage fluctuation and network current distortion. In order to deal with above problems, a control strategy of parallel PWM rectifier based on stationary coordinate system is proposed in this paper. A mathematical model is built under unbalance voltage conditions. Basic principle of positive, negative and zero sequence circulating current suppression is given. DC voltage outer loop based on proportion integral resonant（PIR） controller and grid-side current inner loop based on proportion feedback resonant controller is proposed to eliminate DC bus voltage fluctuation and grid-side current harmonics. The overall control diagram of PWM rectifier parallel operation is given. The parameters of proportion feedback resonant controller are designed. Finally, simulation research is carried out with simulation software, and effectiveness of the proposed method is verified with simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2018年第1期330-337,共8页
Power System Technology
基金
国家自然科学基金项目(51407177)
国家电网公司科技项目(DZ71-16-001)~~
关键词
并联型PWM整流器
电网电压不平衡
恒定直流电压控制
环流抑制
比例反馈谐振控制器
parallel PWM rectifier
unbalance gridvoltage
constant DC voltage control
circulating currentsuppression
proportion feedback resonant controller
