This paper presents a new maximum power point tracking (MPPT) method based on the measurement of temperature and short-circuit current, in a simple and efficient approach. These measurements, which can precisely define the maximum power point (MPP), have not been used together in other existing techniques. The temperature is measured with a low cost sensor and the solar irradiance is estimated through the relationship of the measured short-circuit current and its reference. Fast tracking speed and stable steady-state operation are advantages of this technique, which presents higher performance when compared to other well-known techniques.
Summary
The increasing need to improve power quality with the reduction of the harmonic content of current and voltage waveforms has been intensively analyzed in several studies, thus motivating the proposal of many high power factor rectifiers based on the classic converters such as boost and buck‐boost. Moreover, distinct control techniques have also been proposed due to the commercial availability of integrated circuits (ICs) dedicated to impose sinusoidal input currents in switch‐mode power supplies (SMPSs). The boost converter operating in continuous conduction mode (CCM) is by far the most traditional choice for this purpose due to circuit simplicity and low electromagnetic interference (EMI) levels. Within this context, this work analyzes some of the most important control techniques used in power factor correction (PFC). The performance of a single‐phase boost converter using peak current mode control (PCMC), average current mode control (ACMC), and one cycle control (OCC) is evaluated experimentally in detail. A comprehensive analysis of key aspects such as the input current waveform and respective harmonic content, dc output voltage, and dynamic response of the converter is also presented.
Maximum power point tracking (MPPT) is essential in off-grid and grid-tied photovoltaic (PV) applications to extract the maximum available power. This study presents a new MPPT technique named irradiance and temperature (I&T) method. This technique uses the estimation of irradiance and measurement of temperature to define the MPP. It is based on the observation of irradiance effects in PV module current and temperature dependency of PV module voltage. The irradiance will be evaluated through the measurement of short-circuit current. In addition, temperature reading is employed to determine its effects in temperature-dependent variables, thus providing higher efficiency to the I&T method. Good stability in steady state and fast tracking speed, in different conditions of irradiance and temperature, are important features of this technique. Experimental tests compared the performance of the I&T method with conventional and parameter-based methods. The performed tests highlight the effectiveness of the proposed method at uniform and dynamic weather conditions. V PV PV output voltage V T thermal voltage V T,ref thermal voltage at T ref V temp temperature gradient ΔI ref reference current variation
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