ZVS conditions (developed in the paper) lead to an interesting way to control the converter, and a discrete variable frequency control is proposed.
Ltd. use 520-600V/15KW alternators for variable frequency air conditioners.
This paper studied the three-phase PWM(pulse width modulation) rectifier in dual PWM variable frequency speed regulation system.
An APFC control solution for high power variable frequency air conditioner is introduced.
The monitoring systems in some water plants, fan variable frequency monitoring systems in power plant, and boiler control projects and the load regulation systems in power supply have been operating well and playing an important role in the national economy.
For this project ABB Italy and ABB South Korea will supply low voltage switchgear, intelligent motor control units and variable frequency drives.
By adjustment to control signal, systems might realize variable voltage, variable frequency, steady voltage, steady frequency closed loop control.
In this paper GTR Base-drive circuits on PWM variable frequency and variable speed systems for induction motor drive are studied.
Self-excitation of induction motors caused by output LC filters of variable voltage variable frequency(VVVF) power supplies is harmful both to the motor and the power supply.
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