Different harmonic reduction Technique

1.4 Different harmonic reduction Technique.

Many harmonic reduction methods exist. These techniques based on passive components, mixing single and three-phase diode rectifiers, and power electronics techniques as: multi-pulse rectifiers, active filters and PWM rectifiers (Fig. 1.1). They can be generally divided as:

A) harmonic reduction of already installed non-linear load;

B) harmonic reduction through linear power electronics installation.

Fig-1.1: Different harmonic reduction technique

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Traditional harmonic reduction technique

The traditional method of current harmonic reduction involves passive filters LC, parallel-connected to the grid. Filters are usually constructed as series-connected legs of capacitors and chokes [the number of legs depends on number of filtered harmonics (5th, 7th, 11th, 13th) ].

IEEE standards On line current and voltage Harmonic

Reduction of harmonic content in line current to a few percent allows avoiding most of the mentioned problems.

List of Symbols of Power Electronics

List of Symbols used in Power Electronics books. Average value of the output DC voltage., Average value of the output DC current., Output dc power.,Output capacitor. The root mean square (rms) value of the ac voltage., The rms value of the ac current. Efficiency ( or Rectification ratio) of a rectifier.

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