单相Buck-Boost逆变器的全局滑模电流控制

为提高非隔离型Buck-Boost逆变器的动态品质和鲁棒性,提出一种全局滑模电流控制策略。该控制策略通过使用电流、电压信息的非线性组合构造全局滑模面函数,同时缓解了右半平面零点对系统稳定性的影响。设计全局变指数趋近律以保证控制器自动满足滑模存在条件,简化等效控制函数的设计过程,并给出滑模控制逆变器的闭环稳定性条件。最后的实验结果表明,该控制策略可保证较高的输出精度,同时能够有效地提升系统的动态品质和鲁棒性。

Global Sliding Mode Current Control Strategy for Single Phase Buck-Boost Inverter

In order to improve the dynamic quality and robustness of the non-isolated Buck-Boost inverter,a global sliding mode current control strategy was proposed.By using the nonlinear combination of current and voltage information,the global sliding mode surface function was constructed,meanwhile the impact of the right half plane zero point on the system stability was eliminated.The global exponential reaching law was designed to ensure the controller satisfy existence conditions automatically,simplify the design process of equivalent control function,and give the closed-loop stability condition of the sliding mode control inverter.Experimental results manifest that the proposed strategy has a high output accuracy,and improves the system dynamic quality and robustness.