Variable Frequency Converters for Industrial Applications

380V/690V series of variable frequency converters for industrial applications is the series of high-power frequency converter developed by our company to meet the demands of high-power industrial users faced with speed control of asynchronous motor, frequency conversion asynchronous motor, synchronous motor and permanent-magnet synchronous motor in the industrial fields. It adopts the “3-phase and 12-pulse wave rectification, 3-phase contravariant and filter technique”, it has many advantages like mature technology, advanced performance, complete function, good quality, compact structure, low price, convenient use and good service, etc. 

The 380V/690V series of variable frequency converters for industrial applications of CenteRole (Dalian) Electric Transmission Technology Co., Ltd. is designed and produced aimed at the maturity, stability, practical property and economical efficiency required by the high-power users. The transformer at the input side of this variable frequency converter and the 2 sets of rectifiers can realize the 12-pulse wave rectification, can weaken the effect of rectification for the quality of electric energy at the power grid side, and the content of harmonic contents input from the power grid side is sharply reduced compared with the common 6-pulse wave rectification. 2 power modules are equipped with this variable frequency converter, and the power module consists of diode rectifier and 3-phase PWM inverter. After the output of 2 power modules with the same structure and parameter is connected in parallel, the motor is driven by the sine wave filter. In addition, the primary side winding of the transformer of this variable frequency converter can adjust the input voltage of the rectifier through the star-triple conversion to adapt to the power supply of 690V and 380V. The output sine wave can be controlled by the by-pass switch, and the output can be selected to be sine wave or PWM wave based on actual demands. 

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