Abstract
A control scheme is presented for a dual inverter drive with a floating capacitor bridge, with decoupled motor and capacitor dynamics. A stator current reference frame is used that decouples the real and reactive power components of the motor and enables the decoupling of the motor and capacitor dynamics. Apart from the high frequency voltage ripple due to the inverter switching pattern, the capacitor voltage can be kept constant even during large step changes in motor speed reference and load torque. This allows for the use of a significantly smaller floating bridge capacitor whose size depends only on the steady-state high frequency voltage ripple. Additionally, the number of PI regulators used compared to previous works and the dc-link voltage requirements are both reduced.
Highlights
T HE internal combustion engine-based vehicle is gradually being replaced by electric vehicles (EVs) due to their superior performance in terms of efficiency, reliability, cost, and environmental friendliness
The second control objective is achieved by controlling the real power flow into the floating bridge (FB), while the third objective is achieved by keeping the reactive power output of the main bridge (MB) at zero during high torque operation
The dc-link voltage for unity power factor operation of the MB is determined by point B. Either both dc-links must be increased if a 1:1 ratio is used, or the FB dc-link should be doubled while keeping the MB link at (11) to give a 1:2 ratio
Summary
T HE internal combustion engine-based vehicle is gradually being replaced by electric vehicles (EVs) due to their superior performance in terms of efficiency, reliability, cost, and environmental friendliness. The third configuration, the focus of this article, has one inverter supplied by a dc source while the other inverter uses a floating capacitor connected across its dc-link to supply reactive power This configuration retains the typical DID advantages such as voltage boost and better PWM, while eliminating common mode currents and isolated supply requirements. 2) The above benefit is realized by the use of a stator current reference frame This reference frame is revealed to decouple the voltage requirements of the motor and FB capacitor into their real and reactive power components. The need for the dedicated PI controller used in [3], [19], [20] to operate the MB at unity power factor is eliminated, further simplifying the control This allows the MB to supply part of the reactive power requirement of the motor during low torque operation, which reduces the dc-link voltage requirements
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