Traditional harmonic reduction technique

1.4.1 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) ]. The advantages of passive filters are simplicity and low cost.

The disadvantages are:

each installation is designed for a particular application (size and placement of the filter elements, risk of resonance problems),

high fundamental current resulting in extra power losses,
filters are heavy and bulky.

In case of diode rectifier, the simpler way to harmonic reduction of line current are additional series coils used in the input or output of rectifier (typical 1-5%).

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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:

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.

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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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