Rastreamento da máxima potência utilizando o método baseado na medição de temperatura com modulação OCC digital

Abstract

Photovoltaic systems have stood out among the different types of renewable energy sources by directly converting sunlight into electricity, low maintenance, good performance in electricity production and do not produce greenhouse gases. Due to some climatic changes of temperature, radiation and shading on the panel, the production of electricity is compromised and this causes a decrease in the generation efficiency of the photovoltaic panels. Therefore, they need a tracking system that makes the panel operate at the maximum power point. These tracking systems are the so-called Maximum Power Point Tracker – MPPT. The main objective of this work is to build a photovoltaic system controlled by a DSP TMS320F28335 and switched converter boost type, so that the system traces the maximum panel power, maximizing your efficiency. In this work a control strategy is implemented based on the panel temperature measurement to provide the reference voltage equivalent to the maximum power point under outside conditions of international testing standards and simulating shading effects of photovoltaic cells and temperature and load variations. According to the temperature read by the sensor LM35, the DSP TMS320F28335 will adjust the reference voltage of the PI controller resulting in a duty-cycle value of the Boost converter. The switch of the boost converter will be done using the control technique One Cycle Control – OCC rather than the widely used PulseWidth Modulation – PWM. The OCC switching technique provides some advantages over PWM as a quick response to the reference change, null error in steady state and rejection of input disturbances. Simulated tests were performed by varying the climatic conditions of radiation and temperature and analyzed the operation of the OCC in relation to the PWM. The experimental results show that the scheme based on temperature measurement has some advantages over the Constant Voltage method using PWM modulation.