提高双有源桥变换器动态性能的预测电流模式控制OA北大核心

A predictive current mode control algorithm is proposed in this paper to improve the dynamic performance of a dual-active-bridge ( DAB ) converter during load switching.First,the voltage and current waveforms of the DAB converter during a switching cycle are analyzed,and the prediction equation is derived.In the next control cycle,the control value is updated immediately according to the prediction equation,so that the current response bandwidth is close to the switching frequency,thereby improving the output voltage dynamic response speed.Then the algebraic relationship between the instantaneous value of output current and that of inductance current is also deduced,and the output current is used to replace the inductance current affected by the switching oscillation to improve the noise immunity.Second,a reduced-order model of DAB is established,and the traditional two-pole two-zero( 2P2Z ) voltage mode controller is deduced,which is further compared with the proposed algorithm.Finally,simulation results and experimental results under various operating conditions show that compared with the 2P2Z voltage mode control,the proposed algorithm reduces the closed-loop output impedance of the converter,enables the inductance current to respond quickly in a control cycle,and greatly improves the dynamic performance of output voltage during load switching.