并联混合电力有源滤波器的非线性控制算法

并联混合电力有源滤波器是一非线性、多变量、强耦合的系统,对其建立精确的数学模型比较困难.文中采用了非线性鲁棒控制技术,该技术将配置非线性结构替代极点配置进行控制系统的设计,依靠期望轨迹与实际轨迹之间的误差大小和方向来实施非线性反馈控制,它对混合电力滤波器的数学模型要求并不高.数字仿真结果表明,该控制技术能较好地控制混合电力有源滤波器,并具有较好的动态特性和较强的鲁棒性.

NONLINEAR CONTROL ALGORITHM OF ACTIVE POWER FILTER FOR AC/DC HYBRID POWER GRID

Hybrid active power filter is a nonlinear and multivariable system with strong coupling. Because of the difficulty of building precise mathematical model for such a kind of power filter, in the design of the control system for the filter the nonlinear auto-disturbance rejection control technique was used in which the non-linear structure would replace the pole allocation, and the non-linear feedback control was implemented by the direction and magnitude of the error between the expected trajectory and actual trajectory. This control method need not high precision of mathematical model, simulation results show that the presented control technique can control the hybrid active power filter well and possesses better dynamic characteristics and robustness.