control (VFC) method shows promising use in the future for long distance belt conveyor drives due to its excellent performances.The NPC three-level inverter using high voltage IGBTs make the Variable frequency control in medium voltage applications e much more simple because the inverter itself can provide the medium voltage needed at the motor terminals,thus eliminating the step-up transformer in most applications in the past.РThe testing results taken from the VFC control system with NPC three.1evel inverters used in a 2.7 km long belt conveyor drives in Chengzhuang Mine indicates that the performance of NPC three-level inverter using HV-IGBTs together with the control strategy of rotor field-oriented vector control for induction motor drive is excellent for belt conveyor driving system.
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