直流充电桩前级变换器快时标分岔抑制

Fast Time Scale Bifurcation Suppression for DC Charging Pile Front-stage Converter

为分析直流充电桩前级峰值电流控制Boost功率因数校正变换器在快时标下的非线性分岔现象,加入控制手段对分岔现象进行有效抑制。首先,建立变换器的频闪映射模型,通过模型数值仿真结果再现系统电感电流出现的间歇性分岔和混沌现象;然后,加入自整定PI控制共振微扰法的控制手段对分岔现象进行抑制,让系统始终稳定工作在单周期态。仿真结果表明,与固定斜坡补偿控制法相比,自整定PI控制共振微扰法在对分岔和混沌现象有效抑制的同时,弥补了固定斜坡补偿方法会出现输入电流死区的不足,并使系统具有较高的功率因数和更好的鲁棒性,且该算法在工程应用中易于实现。

In order to analyze the nonlinear bifurcation phenomenon of Boost power factor correction converter with peak current control in the front stage of DC charging pile under fast time scale,control means are added to effectively suppress the bifurcation phenomenon.Firstly,the stroboscopic map model of the converter is established,and the intermittent bifurcation and chaos phenomena of the inductor current are reproduced by the numerical simulation results.Then,the self-tuning PI control resonance perturbation method is added to suppress the bifurcation phenomenon,so that the system always works stably in the single-period state.The simulation results show that compared with the fixed slope compensation control method,the self-tuning PI control resonance perturbation method can effectively suppress the bifurcation and chaos phenomena,and make up for the shortage of the input current dead zone in the fixed slope compensation method.The system has higher power factor value and better robustness,and the algorithm is easy to implement in engineering applications.