The term electrical power quality  refers to maintaining the  fundamental sinusoidal waveform of power
distortion of voltage and current waveform at rated magnitude and frequency .The
harmonic level gets increased by the usage of power electronic devices ,induction
furnace. This leads to the cause of minimization in reliablility and stability.
 To overcome these problems,it is a need
to maintain power quality.These problems arise due to the electrical
disturbance. Most of the disturbances depend on the amplitude or
frequency.  Harmonic causes overheating
of motros,cables,transformers.And also reduce the life span of many devices.So
passive filter is used to reduce harmonics. With the rapid developments and use
of nonlinear loads, the controlling technique is important over the harmonic.  A harmonic is a sinusoidal component of a
periodic wave having a frequency that is an integral multiple of the
fundamental frequency. The main sources of harmonics in power systems has been
the static power converter used as rectifiers, adjustable speed drives,
switched-mode supplies, frequency changers for induction heating. Fortunately,
the available software for harmonic analysis has also grown. The investigation
of harmonics has been carried out using Fast Fourier Transform to evaluate the
Total Harmonic Distortion of the converters with and without filters.Power
electronic based devices are widely being used for inversion, rectification and
other applications. Though these devices are more effective they generate and
inject harmonics into the power system. Traditionally, efficiency
investigations in power systems

consider only distortion-free waveforms, that
is, the voltage and current waveforms are assumed to be sinusoidal. A harmonic
is a sinusoidal component of a periodic wave having a frequency that is an
integral multiple of the fundamental frequency. The main sources of

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harmonics in power systems has been the static
power converter used as rectifiers, adjustable speed drives, switched-mode
supplies, frequency changers for induction heating. Since nonlinear loads
represent an increasing percentage of the total load of an industrial or

commercial power system, harmonic studies have
become an important part of overall system design and operation. Fortunately,
the available software for harmonic analysis has also grown.