Speed Control of Separately Excited DC Motor Supplied by PV Arrays
Abstract
In recent day modern power, system and industrial application witnessed great interest by engineering and scientist. Converters used with these applications also developed leading to improve efficiency, power management, cost, reliability and others. Bidirectional dc-dc converters are the base for all electric systems, which depends on dc power flow through networks or grids. In this work different kind of bidirectional converter are introduce, As well as the operation principle with limitation will propose. This review include several parts covered converter topology, operations, application, system storage units and control strategy.
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Introduction
Recently the high rates of pollution and carbon emissions resulting from the generation of electrical energy using organic sources have led to thinking about relying on other sources. On the other hand, the urban expansion of cities and the wide distances between them make the process of delivering electricity to users more difficult and more expensive, Thus, researchers and engineers thought about finding other means of generation. Renewable energy sources such as water energy, geothermal energy, wind energy, and solar energy, represented the most important of these sustainable sources, and environmentally friendly.[1][2][3]][10]. Photo voltaic cells (pv) considered as the major and simplest mean use for generating electricity, it convert the solar wave to electric energy during the day, supplying customers with excess energy, through which they charge suitable batteries as a storage unit for use during the night as back up sources. Photovoltaic can deliver power to device or customer through dc –dc buck –boost, or buck converters to control and regulate both voltage and current feeding dc load. This load may be fraction to hundred watt for example motors, light, heating etc...[3][9].that it is innovative, it is used in the section "Research Method" to describe the step of research and used in the section "Results and Discussion" to support the analysis of the results [3]. Another suggestion of speed control of dc motor presented by Tanjim Tarannum depends on D ANFIS controller, by proposed the model he got an efficient speed regulation by increasing the rise time and reduced the peak of ripple [11]. Ujjwal Kumar present regulation of separately excited dc motor using different method of Tuning Conventional Controllers such as PI, and Z-N method, by using both methods gives a good regulation performance for motor but the second considered the better due to its fast response, superior dynamic reaction and minimum overshoot [12].
Conclusion
In this work, an examination of proportional –integral (PI) controller presented. It shows its effects on system performance of separately excited dc motor speed fed from photo voltaic (PV). The search pointed to show the effect of controller on speed regulation at sudden change of load. Where dc motor fed from pv its operate normally according to operation principle of motor. Controller established strength in keeping motor speed under changing load conditions, as well as minimizing the steady state error and over shoot for the targeted value. Using closed loop controller successfully tracked the required speed. In summery this work donate in mechatronics and renewable energy systems as a sustainable energy source and automation process.