电动汽车用飞轮电池输出电压平稳控制研究

Research on Output Voltage Smoothing Control of Flywheel Battery for Electric Vehicles

针对电动汽车用飞轮电池的输出电压平稳控制问题,提出一种基于状态观测器的积分滑模控制器。上述方案首先利用T-S模糊逻辑逼近Boost变换器数学模型中的非线性未知函数,对其进行线性化描述。然后设计一个状态观测器和一个基于观测量的积分滑模控制器来保证Boost变换器非线性系统的稳定运行。同时为了使得到的控制器稳定条件是线性矩阵不等式的形式,引入了Finsler引理处理不等式中的耦合项。上述方案实现了对非线性系统状态量的观测,且削弱了传统滑模控制中的抖振问题。最后通过实例验证了上述控制器的有效性,保证了飞轮电池输出电压的平稳控制。

An integral sliding mode controller based on state observer is proposed for the smooth control of the output voltage of the flywheel battery for electric vehicles.Firstly,the unknown function in Boost converter mathematical model was approximated and linearized by T-S fuzzy logic.Then a state observer and an observer-based integral sliding mode controller were designed to ensure the stable of the Boost converter nonlinear system.At the same time,in order to ensure that the stability condition of the controller is in form of linear matrix inequality,the Finsler lemma was introduced to deal with the nonlinear term in inequality.This scheme realized the control of nonlinear affine systems with unpredictable state quantities and weakened the chattering problem in the traditional sliding mode control.Finally,the effectiveness of the controller was verified by an example and the smooth control of the output voltage of the flywheel battery was realized.