Development and testing of 1MW variable frequency drive

With the change in scenario of continuous thrust for the improvement of efficiency of the overall system, motors are being coupled with variable frequency drives (VFD) to achieve energy savings, reduced wear and tear on motors, reduction of maintenance cost of mechanical flow controls etc. To meet the market requirements in the low voltage segment, 1MW, 690V ac drive has been developed. The system was successfully tested for V/f control, sensor-less vector control, power on ride through and catch on fly. Various issues related to testing of the machine with open loop v/f control and sensor less vector control were addressed successfully. Load testing of the 1MW VFD also completed with back to back test facility. This paper presents the development and testing of the developed 1MW VFD with the experimental results.