LCL滤波PWM整流器的新型准直接功率控制

摘要

The LCL filters cause resonance and need active damping control. In order to solve the problem, a novel quasi direct power control scheme for three-phase LCL-based PWM rectifier is proposed based on the derivation of relationship between the power and the current. The AC-side control system includes two loops—an outer power loop and an inner current loop. The power loop provides current command for the current loop. Capacitor current feedback is used in the current loop for active damping. The control system structure is introduced and detailed design procedure of the controller is analyzed. The proposed method has clear principle and is easy to implement. The simulation results show that the system is stable, the resonance is suppressed, the AC-side currents are highly sinusoidal with a power factor close to 1, and the system has excellent steady state performance and transient performance.%　　针对LCL滤波器存在谐振、需要采取有源阻尼控制的特点，在推导功率与网侧电流关系的基础上，提出一种三相电压型LCL滤波PWM整流器的新型准直接功率控制策略。交流侧采用功率外环和电流内环的双环结构，功率环为电流环提供电流指令，电流环引入电容电流反馈，实现有源阻尼。介绍了控制系统的结构，详细分析了控制器的设计过程。所提方法具有原理清晰，简单易实现的优点。仿真结果表明系统稳定，谐振得到抑制，网侧电流正弦度高，功率因数接近于1，稳态和暂态性能优良。