Typical applications of frequency inverters
Because of significant energy saving and better process control, frequency inverters (frequency changers, frequency converters) are widely applied in the industry. Typical applications are mainly in these 2 types.
One common application of this device: converting bulk amounts of power from one distribution standard to another.
One other typical application is: Frequency inverters are often used to control the speed and the torque of AC motors too. The most typical frequency inverters topology is the 3 phase two-level voltage source inverter. The phase voltages are controlled using the power semiconductor switches and pulse width modulation (PWM). Semiconductor switching devices and anti-parallel connected freewheeling diodes form a bridge, which can connect each motor phase to the positive or negative dc-link potential. The pulse width modulation (PWM) changes the connections of the phases between the positive and the negative dc-link potentials. Thus the fundamental wave voltage has the desired frequency and amplitude. The motor reacts primarily to the fundamental voltage and filters out the effects of the harmonic voltages.
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Another application of frequency inverters (frequency changers, frequency converters) is in the aerospace and airline industries. Of course some of us know little about this. Often airplanes use 400 Hz power. So 50 Hz or 60 Hz to 400 Hz frequency inverter is needed for use in the ground power unit used to power the airplane while it is on the ground.
In renewable energy systems, frequency inverters (frequency changers, frequency converters) are an essential component of doubly fed induction generators (DFIGs) as used in modern multi-megawatt class wind turbines.
Frequency inverters (frequency changers, frequency converters) are typically used to control the speed of pumps and fans. In many applications in the industry, significant energy savings are achieved. The most demanding application areas for frequency inverters (frequency changers, frequency converters) are found on the industrial processing lines, where the control accuracy requirements can be very high.
