Power Factor Improvement Using Thyristor Switched Capacitor Using Microcontroller

Power Electronic

Due to electrical distribution systems are consists of large losses in industries were loads are wide spread, less effective reactive power compensation facilities and their improper control which results in ineffective utilization of electrical energy and hence result in power losses which cost great in terms of money for industries. The comprehensive static VAR compensator consisting of capacitor bank in four binary and eight binary binary sequential steps in conjunction with a Thyristor (SCR) or Traic controlled reactor of smallest step size is employed in the investigative work. The performance evaluation through analytical studies and the practical implementation on the existing system consisting of a distribution transformer of 1 PH phase 50 Hz, 1KV/230V capacity. This paper describes advancement of single phase SCR based Static VAR Compensate and SVC for reactive power compensation and power factor correction using ARM microcontroller and isolation circuit. The ARM microcontroller determines the firing pulse in square wave for the SCR or Traic to compensate excessive reactive components, thus making the PF near to unity. Due to small percentages of harmonics of TCR size is minimum, practically there is no need to provide inrush current limiting reactors, and The switching operations obtained are transients free facilitates step less variation of reactive power depending on load requirement so as maintain power factor near unity.

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