LC串联式脉宽调制整流器及其电流迭代控制方法

发布时间：2018-03-09 11:52

本文选题：脉宽调制整流器　切入点：三电平变换器　出处：《电力系统自动化》2017年12期 　论文类型：期刊论文

【摘要】：针对非线性负载引起的无功功率和谐波电流问题,研究了一种电感—电容(LC)串联式脉宽调制(PWM)整流器及其电流迭代学习控制方法,使三相PWM整流系统不仅能够整流输出能量供给负载,而且能补偿非线性负载产生的无功功率和谐波电流,实现PWM整流功能和功率补偿功能的有效集成。该整流器采用一种LC串联滤波,使电容承担大部分电网基波电压,整流器可直接连接电网,降低装置成本。为克服LC串联式滤波器的电容惯性阻尼作用,采用一种迭代学习算法的电流无差拍控制,并结合输出电流前馈控制和反馈控制的特性,有效提高控制系统的响应速度和控制精度,并推导了算法收敛的条件。仿真和实验结果证明了所提结构和控制方法的正确性和有效性。
[Abstract]:In order to solve the problem of reactive power and harmonic current caused by nonlinear load, a series pulse width modulation (PWM) rectifier with inductor-capacitor LC and its current iterative learning control method are studied. The three-phase PWM rectifier system can not only supply the load with rectifier output energy, but also compensate the reactive power and harmonic current generated by nonlinear load. PWM rectifier and power compensation function are integrated effectively. The rectifier adopts a LC series filter, which makes the capacitor bear most of the fundamental voltage of the power network, and the rectifier can directly connect to the power network. In order to overcome the capacitive inertia damping of LC series filter, an iterative learning algorithm is used to control the current without beat, and the characteristics of feedforward control and feedback control of output current are combined. The response speed and control accuracy of the control system are improved effectively, and the convergence conditions of the algorithm are derived. The simulation and experimental results show that the proposed structure and control method are correct and effective.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家自然科学基金青年基金资助项目(51607062)~~
【分类号】：TM461

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