Harmonics Analysis are the processes of solving a periodic, non-sinusoidal quantity into small sinusoidal parts. [Ref.19, ch.34]
Any periodic function can be show as the formula below [5].
[5]
Where an and bn are the Fourier coefficients and n is a positive integer and the period of f(x) is 2pi therefore,
[6]
[7]
[8]
In Static Var Compensators, some of the harmonics are generated by the current through the Thyristor Controlled Reactor.
Some of those can be reduced between the transformer and between a 12-pulse operation of the compensator.
Here are some of the problems caused by the harmonics:
- Nuisance tripping of circuit breakers or fuses blowing.
- Erroneous operation of control system equipment.
- Excessive heating and failure of transformers, motors, capacitors, switchgear lighting, cables, etc.
- Electronic communication interference.
- Excessive neutral current.