There is no easy way to convert Photovoltaic (PV) energy with high efficiency due to dynamic changes in solar irradiance and temperature. This paper illustrates a control strategy to design and implementation of Maximum Power Point Tracking (MPPT) in a photovoltaic system using Perturb and Observe (PandO) algorithm. The PSIM simulation results confirm proper functioning of the proposed MPPT sub-circuit to achieve a constant 48V DC output from fluctuating voltage of solar panel by varying duty cycle of the MOSFET in the 24V-48V boost converter. The filtered output waveform of the SPWM driven H-bridge inverter via the L-C low pass filter is found to be a pure sine-wave of 48V peak which is then stepped-up 312V peak (220V rms) by using a step up transformer. The frequency of output voltage is found to be 50Hz with a total harmonic distortion (THD) of 0.001 which is much lower than the IEEE 519 standard.
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机译：由于太阳辐照度和温度的动态变化，没有简单的方法可以高效地转换光伏（PV）能量。本文阐述了一种采用Perturb and Observe（PandO）算法在光伏系统中设计和实现最大功率点跟踪（MPPT）的控制策略。 PSIM仿真结果证实了拟议的MPPT子电路的正常运行，通过改变24V-48V升压转换器中MOSFET的占空比，从太阳能电池板的波动电压获得恒定的48V DC输出。发现通过L-C低通滤波器对SPWM驱动的H桥逆变器进行滤波后的输出波形是峰值为48V的纯正弦波，然后通过使用升压变压器将其升压为312V峰值（220V rms）。发现输出电压的频率为50Hz，总谐波失真（THD）为0.001，远低于IEEE 519标准。
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