WHAT SI POWER QUALITY?
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Power Factor and improvement



Capacitance
Xc=106/2 fC = V/I
Capacitor current = kVAr x 1000 / V
The opposition to current in a capacitor is termed as capacitive reactance. The current in a purely capacitive circuit will lead the voltage by 90.


Effect of low power factor
kW capacity of the transformer is decreased
Cross-sectional area of the busbars and the switchgear must be increased
The kVA capacity of the alternator is more



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Presented by:
BHOGARAJU RAVALI


A NEW METHOD FOR POWER QUALITY IMPROVEMENT IN CLASSICAL AC/AC VOLTAGE CONTROLLER USING PWM TECHNIQUE
INTRODUCTION
AC voltage controllers, allow controlling the output voltage only, while the output frequency is the same as the input frequency.
AC voltage controllers are widely used to obtain variable AC voltage from fixed AC source. Triacs or thyristors are usually employed as the power control elements of such controllers.
Advantages include simplicity and ability of cont ....etc

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power factor,its consequences.and improvement
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Common mode rejection ratio (CMRR) is important performance parameter of any difference amplifier. It is the ratio of the differential gain to the common-mode gain, generally expressed in dB. It signifies the ability of an opamp to reject common mode signal, the signal which appears simultaneously at both its input terminals. The CMRR is of great importance when it comes to noise rejection. For applications involving high CMRR, instrumentation amplifiers consisting of three opamps are generally used. It has a major disadvantage that the value o ....etc

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Power factor improvement of single phase ac voltage controller employing extinction angle control technique ppt wants
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Feedback linearization method for improvement of power systems transient stability
MINI PROJECT


ABSTRACT
Feedback linearization is a common approach used in controlling nonlinear systems. The approach involves coming up with a transformation of the nonlinear system into an equivalent linear system through a change of variables and a suitable control input. It is done by algebraically transforming non-linear system dynamics into a linear one so that linear control techniques can be applied. The canonical form and the general form ....etc

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download power quality improvement using dvr ppt
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