Mixing single and three phase diode rectifier

1.4.2 Mixing single and three phase diode rectifier

The other technique, based on mixing single and three-phase non-linear loads, gives a reduced THD because the 5th and 7th harmonic current of a single-phase diode rectifier often are in counter-phase with the 5th and 7th harmonic current of a three-phase diode rectifier .

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Rectifiers, their advantages, and disadvantages

Power electronics in broader aspect actually controls the flow of power to make it suitable to be used by diverse type of instruments and appliances. The ability to control the flow of power is derived from using solid state switches along with their controllers.

PWM Rectifier

The most interesting reduction technique of current harmonic is a PWM (active) rectifier (Fig. 1.3). Two types of PWM converters, with a voltage source output (Fig. 1.4) and a current source output (Fig. 1.5) can be used.

Active PWM filter

An alternative to the passive filter is use of the active PWM filter (AF), which displays better dynamics and controls the harmonic and fundamental currents. Active filters are mainly divided into two different types..

Multi-pulse rectifier

1.4.3 Multi-pulse rectifier.

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) ].