随着移相全桥拓扑在新能源发电、电动汽车等电源系统中的应用日益广泛,滑模控制在移相全桥中的应用也越加广泛.针对传统指数趋近律的移相全桥变换器滑模控制方法存在收敛速度慢、负载扰动下鲁棒性差等缺点,提出了一种基于双幂次趋近律的改进滑模控制方法.将该方法应用于移相全桥变换器三阶滑模控制器的设计.建立了移相全桥的数学模型,构建了滑模面,并给出滑模面参数选择方法.通过双幂次项,提高系统收敛速度;引入双曲函数,减少抖振的大小.仿真和实验表明,提出的双幂次趋近律滑模控制方法在负载扰动的调节时间为0.08 s,电压变化0.8 V,相比于PI控制,滑模控制能够提高调节时间0.1 s,在负载变化处电压跳变减少4.2 V.
Application of phase-shifted full-bridge sliding mode control based on double-power approximation rater
With the increasing application of phase-shifting full bridge in new energy power generation,electric vehicles and other power supply systems,the application of SMC(sliding mode control)in phase shift full bridge is becoming more and more extensive.Aiming at the shortcomings of the sliding mode control method of phase-shifted full-bridge converter with traditional exponential approximation law,such as slow convergence speed and poor robustness under load disturbance,an improved sliding mode control method based on double-power approximation law is proposed.This method is applied to the design of third-order sliding mode controller of phase-shifted full-bridge converter.The mathematical model of phase-shifted full bridge is established,the sliding form surface is constructed,and the sliding mode surface parameter selection method is given.Through the double-power term,the system convergence speed is improved.A hyperbolic function is introduced to reduce the size of jitter.Simulation and experimental results show that the proposed double-power approximation law sliding mode control method has a regulation time of 0.08 s and a voltage change of 0.8 V when the load is disturbed,compared with PI control,the sliding mode control can improve the adjustment time by 0.1 s and reduce the voltage jump by 4.2 V at the load change.
phase-shifted full bridgesliding modedouble-power approximation raterconverter
万方数据
维普
