POWER QUALITY

G.Sowmya

Email id: sowmyareddy0216@gmail.com

Phone number: 7842495978

ABSTRACT

Introduction:

Power quality is simply the interaction of electrical power with electrical equipment. If electrical equipment operates correctly and reliably without being damaged or stressed, we would say that the electrical power is of good quality. On the other hand, if the electrical equipment malfunctions, is unreliable, or is damaged during normal usage, we would suspect that the power quality is poor.

 Power quality issues can be high-speed events such as voltage impulses / transients, high frequency noise, wave shape faults, voltage swells and sags and total power loss. Ideally, the best electrical supply would be a constant magnitude and frequency sinusoidal voltage waveform.

The quality of electrical power may be described as a set of values of parameters, such as:

Continuity of service

Variation in voltage magnitude

Transient voltages and currents

Harmonic content in the waveforms for AC power

Importance of power quality improvement:

If the Power Quality of the network is good, then any loads connected to it will run satisfactory and efficiently. Installation running costs and carbon footprint will be minimal. If the Power Quality of the network is bad, then loads connected to it will fail or will have a reduced lifetime, and the efficiency of the electrical installation will reduce.

Causes and effects:

Black outs Brown outs Voltage sag Interruptions Voltage spikes

Voltage swell Harmonic distortion Voltage surges Flickering Voltage fluctuation Noise Voltage unbalance

Mitigation techniques:

Dynamic voltage restorer Sag detection techniques Control techniques Harmonic filters Distribution Static compensators Constant voltage transformers Isolation transformers Transient voltage surge suppressors Noise filters Static VAR compensators

Unified power quality conditioning Impacts on environment and society