【摘要】 针对有源电力滤波器模型的非线性强耦合特点,提出了一种基于状态反馈精确线性化的非线性控制策略。采用状态空间平均建模方法建立了三相并联型有源电力滤波器的仿射非线性模型,并从理论上证明了所建立的模型满足状态反馈精确线性化的条件,推导出了非线性系统的反馈控制律,实现了原系统的状态反馈精确线性化。再利用线性系统控制理论设计了控制器,实现了原非线性系统的解耦控制。与PI控制的三角波调制控制方案进行仿真对比分析,验证了所提出的控制方案性能优越,各项性能指标均优于PI控制方案。更多还原

【Abstract】 As the APF(Active Power Filter) possesses the strong-coupled nonlinearity,a control method based on the state feedback exact linearization is proposed. An affine nonlinear model of three-phase shunt APF is built by the state-space average modeling method and it is theoretically verified that the model satisfies the conditions of state feedback exact linearization. The feedback control law of nonlinear system is derived to realize the state feedback exact linearization of the APF affine model,with which a controller is designed to implement the decoupled control of APF. Simulation is carried out to compare it with the triangle wave modulation method of PI control,which verifies its superiority with better performance indexes.更多还原