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Closed-Form Frequency Model of 3-Phase Inverter Drive for DC Distribution System Analysis
Technical Paper
2002-01-3232
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
Power Systems Conference
Language:
English
Abstract
In this paper a model of a three-phase inverter drive will be presented that is suitable for inclusion in a DC distribution system analysis. It will be shown that the drive can be accurately modeled on the electrical side by a capacitor, representing the bus capacitance of the inverter, in parallel with a current source. The current source consists of a DC component, corresponding to net power flow to and from the flywheel, plus high-frequency current harmonics generated by the operation of the switch-mode inverter. Closed-form expressions for the current harmonics can be derived by analyzing the AC currents in the electric machine and the switch-mode nature of the inverter, including the “dead-time” effect, and will be presented in the paper. Comparisons between edge-based and center-based pulse-width operation suggest that center-based PWM produces less harmonic content. It is shown that “dead-time” can have a significant effect on the harmonic content. Experimental results taken on a three-phase inverter with an inductive load validate the presented model.
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Citation
Hofmann, H., Stroman, R., and Lanagan, M., "Closed-Form Frequency Model of 3-Phase Inverter Drive for DC Distribution System Analysis," SAE Technical Paper 2002-01-3232, 2002, https://doi.org/10.4271/2002-01-3232.Also In
References
- Kenny B.H. Kascak P.E. “DC Bus Regulation with a Flywheel Energy Storage System” Paper 02PSC-61 SAE 2002 Power Systems Conference