In order to solve the problems of traditional perturbation and observation method,such as low steady-state accuracy,poor response speed and high possibility of misjudgment,an improved variable step perturbation and observation method is proposed based on hysteresis comparison.The photovohaic cells are studied and the principle of maximum power point tracking (MPPT) with BOOST converter is discussed.The simulation model of MPPT is established in Matlab/Simulink,and the feasibility of the proposed method is verified.DSP (with chip TMS320F28335) was used in the experiment.The proposed method can quickly track the maximum power point,and it has good starting characteristics,which effectively eliminates the misjudgment and the oscillation in the vicinity of maximum power point.%为了解决传统扰动观察法稳态精度低、响应速度差、容易发生误判等问题,该文提出了一种基于滞环比较的变步长改进型扰动观察法.文中对光伏电池进行了深入的研究,探讨了升压变换器实现最大功率点跟踪MPPT的原理,在Matlab/Simulink中建立了MPPT的仿真模型,通过仿真验证了该方法的可行性.采用DSP(芯片为TMS320F28335)进行了实验,验证了该方法能快速跟踪到最大功率点,并且有良好的启动特性,有效消除了误判及最大功率点附近的振荡现象.
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