Medium-voltage (MV) drives are generally based on
either voltage-source inverters or current-source inverters (CSIs).
CSIs feature simple topology, motor-friendly waveforms, power
reversal capability, and short-circuit-proof protection; hence, they
are widely used as high-power MV drives. Direct vector control
(DVC) CSI drives ensure improved performance by decoupled
control of the machine flux and torque using two independent
control loops. Despite the excellent performance of DVC, this
scheme faces practical challenges, like dc offset in the stator model
and machine parameter dependence. Conventional indirect vector
control (IVC) CSI drives are known for reduced computational
burden and less machine dependence. However, conventional-IVC
CSI drives exhibit poor dynamic response and transient field
misorientation due to the absence of a dedicated flux control loop.
In this paper, a modified IVC technique is proposed featuring
superior decoupling and field orientation using only two extra
proportional–integral current controllers with additional motor
current feedback signals. The proposed-technique effectiveness is
examined experimentally, on a scaled low-voltage prototype, as
well as using simulation results.
Medium-voltage (MV) drives are generally based oneither voltage-source inverters or current-source inverters (CSIs).CSIs feature simple topology, motor-friendly waveforms, powerreversal capability, and short-circuit-proof protection; hence, theyare widely used as high-power MV drives. Direct vector control(DVC) CSI drives ensure improved performance by decoupledcontrol of the machine flux and torque using two independentcontrol loops. Despite the excellent performance of DVC, thisscheme faces practical challenges, like dc offset in the stator modeland machine parameter dependence. Conventional indirect vectorcontrol (IVC) CSI drives are known for reduced computationalburden and less machine dependence. However, conventional-IVCCSI drives exhibit poor dynamic response and transient fieldmisorientation due to the absence of a dedicated flux control loop.In this paper, a modified IVC technique is proposed featuringsuperior decoupling and field orientation using only two extraproportional–integral current controllers with additional motorcurrent feedback signals. The proposed-technique effectiveness isexamined experimentally, on a scaled low-voltage prototype, aswell as using simulation results.
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