The Impact of Variable Frequency Drives (Frequency Inverters) (part 7)
Continued from this article: The Impact of Variable Frequency Drives (Frequency Inverters) (part 6).
We continued to introduce how AC drives improve the power factor in the electrical system here.
AC drives (variable speed drives, VFDs) on the market consist of three main power sections, including an AC-to-DC converter, a DC filter and a DC-to-AC inverter.
The modern pulse width modulated (PWM) drives convert the 3 phase AC line voltage to a fixed-level DC voltage. They do this regardless of inverter output speed. Here Pulse width modulated (PWM) inverters provide a constant power factor regardless designing the motor and the controller installation configuration, for example, by adding a reactor between the drive and the motor.
Newer generation drives and motors minimize annoying motor noise of output speed and load. A constant and controlled power factor saves energy and money by reducing electrical bills.
Although AC drives (variable frequency drives) provide many benefits in terms of energy savings, other concerns arise for people who use these drives with induction motors. Two of those concerns are motor noise and motor heating. We will explain in details in our next articles.(to be continued)
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You will be interested in this: Cause of Low Power Factor
And you will know more here: Importance of power factor in distribution system
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You will know the structure of AC drives in details through these articles: The basic blocks of a variable speed drive (VSDs, frequency inverter, ac drive) system
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