基于交错Buck变换器的光伏系统MPPT控制

The MPPT Control for Photovoltaic System Based on Interleaving Buck Converter

摘要:

具有最大功率点跟踪(MPPT)功能的控制器常采用单相Buck变换器,输出功率稳定性差。鉴于此,提出将交错并联技术应用于Buck变换器,并以两相交错并联Buck变换器为例进行研究,减小输出电压、电流纹波,提高了输出功率稳定性,有利于实现MPPT控制；然后针对固定步长扰动观察法跟踪速度与精度之间的矛盾,研究了一种自适应变步长的算法,MATLAB仿真结果表明,改进算法具有较好的跟踪速度和稳态性能。

Abstract:

The single-phase Buck is often used in Power converters which have the function of MPPT, the stability of output power is poor. Because of that, this paper proposes interleaving technique is applied to the Buck converter, Take two-interleaving Buck converter for example, the output voltage and current ripple is reduced, the stability of output power is improved, and it benefits MPPT control. As fixed step size of perturbation and observation method cannot balance between speed and precision. Adaptive step algorithm is proposed. The simulation results show that this algorithm has better tracking speed and steady-state performance.