基于电流馈入型半桥变换器光伏阵列MPPT仿真

MPPT Simulation Research for Photovoltaic Array Based on the Current Fed Half Bridge Converter

针对目前光伏阵列前级DC/DC变换器效率低的问题,采用了一种基于电流馈入型半桥变换器的电导增量法的方案,通过运用电流馈入型半桥变换器实现电气隔离和零电流,同时可以实现较大的电压增益并且实时追踪太阳能光伏的最大功率点。利用Matlab/Simulink仿真软件,建立了光伏阵列的仿真模型,并根据仿真结果验证了所建模型的正确性;分析了最大功率跟踪(MPPT)实现的方法即选用电导增量法来实现,并搭建了MPPT模型;建立了基于电流馈入型半桥变换器的MPPT仿真模型,并对其在标准条件及外界温度、光照变化时做了详细的仿真,根据仿真结果可以验证电流馈入型半桥可以高效率的实现对最大功率的跟踪控制。

Aiming at the low efficiency of the current DC/DC converter of PV array, this paper presents a scheme of incremental conductance based on the current fed half bridge converter that can achieve electrical isolation and ZCS. At the same time, it can realize larger voltage gain and track solar photovoltaic maximum power point. First of all, the simulation model of PV array is established by Matlab / Simulink simulation software,and the correctness of the model is verified according to the simulation results. Secondly, the method of maximum power tracking （MPPT） is analyzed. And the MPPT model is built. Finally, the MPPT simulation model based on the current fed half-bridge converter is established and its simulation is carried out under the standard condition and the changes of environmental temperature and illumination. According to the simulation results, current-fed half-bridge can achieve high-efficiency tracking control of maximum power.