Performance of Simple Boost Controlled Z Source Inverter Fed Three Phase Locomotives in the Motoring Region
نویسنده
چکیده
Electric traction system uses voltage source inverter technology for three phase electric locomotives. This paper proposes Z source inverters to control the speed of locomotive drives. The acceleration region and free running region of operation of locomotive is considered for analysis. The control strategy for Z source inverter used is simple boost control. The speed control method for traction motors is variable voltage variable frequency in the constant torque mode and field weakening in the constant power mode of operation. The front end converter of the locomotive is controlled so as to provide constant dc voltage and keep the input power factor unity. The use of Z source inverter reduced the dc link voltage of the locomotive and also the average total harmonic distortion in the inverter output voltage.
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