Content :

The power unit of the two-quad 3kV high voltage AC inverter is mainly composed of rectifier diode, filter capacitor and IGBT. Each power unit is an H-bridge structure that outputs a set of SPWM waves. The 3kV MV VFD drives have three units per phase. Through the carrier phase shifting technology, the output voltages of each unit are superimposed to form a multi-level high voltage output. The high voltage power inverter of FGI has been widely used in power stations, metallurgical industry, mining, paper and other industries.





Structure





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Power cabinet


Each phase is connected in series by a multi-level unit;
Unit standardized structure, 3kV/6kV/10kV unit junction is the same;
The unit communicates with the control cabinet through the optical fiber to control good performance.


Control cabinet


The control core is based on DSP+FPGA, the system is powerful and can meet the customer's needs to the greatest extent;
Independent main control box, plug-in control board, easy to install and maintain;
Rich interface with multiple choices.


Operating Principle


     


The medium voltage drive is composed of switch cabinet, phase shift transformer cabinet, power unit cabinet control cabinet. Among them, the switch cabinet is different according to different sites.The equipment adopts the high-high voltage source type inverter circuit structure, the power units are connected in series, the output is superimposed into high voltage, and directly output to the high voltage motor.                               


 


3kV series MV Drives with 3 units per phase  /  6kV series .fgi-tech.com