Power Electronics | BengalStudents

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.

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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..

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Multi-pulse rectifier

1.4.3 Multi-pulse rectifier.

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Mixing single and three phase diode rectifier

1.4.2 Mixing single and three phase diode 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) ].

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:

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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.

Introduction to power electronics

In recent times, energy conservation is one of the most popular issues through the world. Lots of debates and discussions are taking place as to how to save energy. One of the best meaningful solutions to the ever increasing energy crisis is to improve energy utilization efficiency...