【摘要】 谐波补偿环节的谐波电流跟踪控制是衡量有源电力滤波器(APF)性能优劣的关键因素之一。针对常规滑模控制中,无论如何调整线性滑模面参数都无法使得跟踪误差在有限时间内收敛到零的问题,提出了电流环基于全局快速Terminal滑模的谐波电流跟踪控制策略。该方法在线性滑模面的基础上引入非线性函数,弥补了常规滑模控制只能实现状态渐进收敛的缺点,在提高滑模控制瞬态性能的同时,消除了切换项,从本质上削弱了抖振。在不改变谐波检测环节的条件下,对APF进行稳态和暂态性能测试,将文中提出的全局快速Terminal滑模控制与常规指数趋近律的滑模控制对比,验证了文中控制策略的正确性和有效性。更多还原

【Abstract】 Harmonic current tracking control in harmonic compensation is one of the key factors to measure the performance of active power filter. Aiming at the problem of adjusting linear sliding surface parameters anyway cannot make the tracking error converge to zero in a finite time for ordinary sliding mode control,harmonic current tracking control strategy based on global fast terminal sliding mode control in current loop is proposed. The method introduces nonlinear function based on a linear sliding surface,to make up for shortcomings of ordinary sliding mode control which can achieve gradual convergence of state,while improving the transient performance of the sliding mode control and eliminating the switching term,which essentially weakens the chattering. The steady-state and transient performance tests of active power filter are carried out without changing the harmonic detection link,the comparison between the global fast terminal sliding mode control proposed and the sliding mode control of the conventional exponential approach law verify the correctness and effectiveness of the control strategy proposed.更多还原