Real-Time Maximum Power Point Tracking Method Based on Three Points Approximation by Digital Controller for PV System

This paper proposes the new method based on the availability of three points measurementand convexity of photovoltaic (PV) curve characteristic at the maximum power point (MPP). Ingeneral, the MPP tracking (MPPT) function is the important part of all PV systems due to their powervoltage(P-V) characteristics related with weather conditions. Then, the analog-to-digital converter(ADC) and low pass filter (LPF) are required to measure the voltage and current for MPPT by thedigital controller, which is used to implement the PV power conditioning system (PCS). Themeasurement and quantization error due to rounding or truncation in ADC and the delay of LPF mightdegrade the reliability of MPPT. To overcome this limitation, the proposed method is proposed whileimproving the performances in both steady-state and dynamic responses based on the detailedinvestigation of its properties for availability and convexity. The performances of proposed method areevaluated with the several case studies by the PSCAD/EMTDC® simulation. Then, the experimentalresults are given to verify its feasibility in real-time. KCI Citation Count: 2