Active rectifiers are those with fully-controlled semiconductor elements (e.g., IGBT transistors) and coupling units between the converter and distribution network. When convenient pulse width modulation (PWM) switching is used with a frequency of several kilohertz, a nearly sinusoidal loading current can be achieved.
Such behavior can be implemented using SimPowerSystems' Universal Bridge or Three-Level Bridge blocks (found in the Power Electronics library). There are demos available in SimPowerSystems that illustrate the use of PWM converters and similar rectifiers.
You can access the documentation for the Universal Bridge and Three-Level Bridge blocks by typing the following at the MATLAB prompt:
doc universalbridge
doc threelevelbridge
The aforementioned demos are also found in the Help browser. Look for them in the General Demos section of the SimPowerSystems demos.
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