Abstract
Ventilation and refrigeration is indispensable process for human life. Particularly, it has vital importance in desert climate conditions and rural areas, where the grid power may not be available. Although the cost is still higher than traditional energy resources, renewable energy may be the right choice for these applications. In this paper, a DSP based variable speed drive for induction motors to actuate a ventilation system supplied photovoltaic arrays is proposed. The maximum power point of the photovoltaic arrays is tracked by proposed variable speed drive. A variable stepped incremental conductance and constant voltage methods are combined to obtain fast tracking algorithm which generates voltage and frequency references for three phase three level inverter. Also the switching frequency of the inverter is kept constant to improve the quality of current waveform at low power levels. Experimental results show that, the proposed system has fast reaction and is suitable for rapidly changing irradiation level. Since the additional converter requirement is eliminated by using single stage inverter, the total system efficiency is increased. DOI: http://dx.doi.org/10.5755/j01.eee.20.5.7111
Highlights
The interest in renewable energy sources is increasing day after day parallel with the world energy demand
By replacing dampers, which are used to regulate the flow of fans, with variable frequency drive (VFD) for induction motor, more efficient operation can be obtained for same flow
A three phase induction motor driver supplied from PV is proposed to generate the mechanical energy for applications such as ventilation, refrigeration and aspiration
Summary
The interest in renewable energy sources is increasing day after day parallel with the world energy demand. A DSP based variable speed drive for PV supplied induction motor is proposed to generate the mechanical energy for ventilation, refrigeration and aspiration applications. The V/f control is a low cost and simple method to control the speed of the induction motor in wide speed ranges In this method, torque response is related with the electrical time constant of the motor and tuning requirement of the control parameters is removed. By replacing dampers, which are used to regulate the flow of fans, with variable frequency drive (VFD) for induction motor, more efficient operation can be obtained for same flow. A novel control algorithm for VFDs reduces the input power of an induction motor used to drive a variable torque load, as fan or pump.
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