This work deals with the utilization of solar photovoltaic (SPV) energy in the brushless DC (BLDC) motor driven water pump. A DC-DC boost converter, used as an intermediate power conditioning unit plays a vital role in efficiency enhancement of SPV array and soft starting of the BLDC motor with proper control. The speed control of BLDC motor is performed by PWM (Pulse Width Modulation) control of the voltage source inverter (VSI) using DC link voltage regulator. No additional control or current sensing element is required for speed control. The behavior of proposed pumping system is demonstrated by evaluating its various performances through MATLAB/simulink based simulation study.
1. Solar PV
2. BLDC motor
3. Boost converter
4. Soft starting
7. Speed control
Fig.1 Configuration of PV array fed BLDC motor-pump.
EXPECTED SIMULATION RESULTS:
Fig.2 Starting and steady state performances of solar PV array
Fig.3 Starting and steady state performance of boost DC-DC converter
Fig.4 Starting and steady state performance of brushless DC motor-pump
Fig.5 Dynamic performance of solar PV array.
Fig.6 Dynamic performance of boost DC-DC converter
Fig.7 Dynamic performance of brushless DC motor – pump
The SPV Array fed boost converter based BLDC motor driven water pump has been proposed and its suitability has been demonstrated by analyzing its various performance indices using MATLAB based simulation study. A simple, efficient and economical method for speed control of BLDC motor has been suggested, which has offered absolute elimination of current sensing elements. The proper selection of SPV array has made the boost converter capable of tracking MPP irrespective of weather conditions. An optimum design of the boost converter has been presented. The safe starting of brushless DC motor has been achieved without any additional control. The desired performance of proposed system even at 20% of standard solar irradiance has justified its suitability for solar PV based water pumping.
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