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Solar Photovoltaic (PV) energy is becoming an increasingly important part of the world's renewable energy. In order to develop technology for efficient energy conversion from a solar PV system, this paper studies typical Maximum Power Point Tracking (MPPT) control techniques used in solar PV industry and then proposes a close-loop and adaptive MPPT method for reliable and rapid extraction of solar PV power. The paper emphasizes especially on how the proposed and conventional adaptive MPPT methods perform under highly variable weather and solar irradiation conditions in a digital control environment. A computer simulation system is developed by using SimPowerSystems and Opal-RT real-time simulation technology which allows for fast and efficient investigations of the MPPT algorithms under high switching frequency conditions for power converters. A hardware experiment system is built to validate and compare the proposed and conventional MPPT techniques in a more practical condition. Advantages, disadvantages and properties of different MPPT methods are compared and studied, evaluated.

Solar photovoltaic (PV) energy is becoming an increasingly important part of the world's renewable energy. In order to develop efficient technology for effective energy extraction from a solar PV system, this paper investigates and compares typical maximum power point tracking (MPPT) control strategies used in solar PV industry. This paper focuses especially on how sampling rate and time delay influence PV system performance by using different MPPT control approaches in a digital control environment, and how different MPPT techniques behave under highly dynamic and variable weather conditions. A computational experiment system is developed by using MatLab, SimPowerSystems and Opal-RT real-time simulation system for fast and accurate performance evaluations of PV arrays under high frequency switching conditions of power converters. Advantages, disadvantages, and characteristics of different MPPT techniques are studied, evaluated, and compared through extensive computational experiments.Index Terms -solar PV array, maximum power point tracking, digital control, computational experiment and thinking

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