三电平PWM整流器的逆系统内模直接功率控制

摘要

A novel strategy based on inverse system decoupling and internal model control is proposed in this paper ai-ming at the disadvantages of complex decoupling control and weak ability against load disturbance in traditional direct power control for three-level PWM rectifier,. Firstly, the power control mathematical model is established, and then two independent pseudo linear systems with the inverse system method are constructed, which will realize the decou-pling control of active power and reactive power. The inner power-loop controller and outer voltage-loop controller based on internal model theory are designed respectively to replace the traditional PI adjuster in order to improve the robustness and dynamic performance. Compared with the traditional direct power control method, the novel strategy has better dynamic and static performance and will realize the unit power factor operation as well as improve system’s anti-interference ability. The simulation results prove the validity and superiority of the novel control strategy.%针对传统的三电平PWM整流器直接功率控制策略解耦方法复杂，抗负载扰动能力不足的问题，提出了一种基于逆系统解耦和内模控制的新型策略。首先建立了整流器的功率控制数学模型，然后采用逆系统方法构造出了两个独立的伪线性系统，实现了有功功率和无功功率的解耦控制。为提高系统的鲁棒性和动态性能，进一步分别设计了功率内环和电压外环内模控制器取代传统的PI调节器。通过与传统的直接功率控制方法对比发现，所提的控制策略实现了单位功率因数运行，具有更好的动、静态性能，增强了系统的抗干扰能力。仿真结果证明了所提控制策略的正确性和优越性。