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- 2018
基于反向解耦的PWM整流器分数阶内模控制
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Abstract:
摘要： 针对三相电压型PWM整流器提出一种新型的双闭环控制策略。基于同步旋转坐标系下PWM整流器的数学模型,利用反向解耦方法实现电流环的完全解耦,且避免了复杂的矩阵求逆运算;根据内模控制(internal model control, IMC)原理,设计了电流环IMC-PI控制器,该控制器仅有一个可调参数;在电压外环控制器的设计中,将IMC与分数阶控制(fractional order control, FOC)相结合,给出一种分数阶内模控制器的设计方法,并利用系统截止频率和最大灵敏度指标,实现了控制器参数的鲁棒整定。仿真结果表明,所提方法可使系统具有更好的动态响应及抗扰性能。
Abstract: A novel double closed loop control strategy was proposed for three-phase voltage source PWM rectifier. Based on the mathematical model of PWM rectifier in synchronous rotating coordinate system, the inverted decoupling method was used to realize the complete decoupling of the current loop, and the complicated matrix inversion operation was avoided. According to the principle of internal model control(IMC), the IMC-PI controllers were designed with only one tunable parameter in the inner loop. In the voltage outer loop, a fractional order IMC controller was designed by combining IMC with fractional order control(FOC)method, and the controller parameters were obtained by the cut-off frequency and maximum sensitivity index of the system. The simulation results showed that the proposed method could provide better dynamic performance and disturbance rejection property
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