Abstract
This article is focused on the analytic definition of the dc-link current of a dual-inverter. Therefore, a two-level dual-inverter for driving two independent three-phase electrical motors is considered. Space-vector modulation is taken into account as the modulation method of the inverter. Based on that, an analytic description is derived for the frequency spectrum as well as for the rms value of the dc-link current of a dual-inverter. Contrary to the current definitions known from previous publications, the expressions presented below are defined in solved form. Therefore, the use of integral or differential equation expressions is not necessary. In this way, a basis is created for calculating the dc-link current without computationally intensive numerical integration processes or SPICE simulations. Furthermore, this article includes the metrological verification of the novel expressions. The results discussed in this publication provide the basis for stabilizing the HV-dc system and for minimizing the dc-link capacitor load. Thus, they enable the dc-link capacitor of a dual-inverter to be downsized. Based on the presented definition of the dc-link current in solved form, the possibility of real-time optimization is created. Furthermore, the results outlined in this article form the foundation to derive the control optimization for a multiphase inverter.
Highlights
THE need of regulating the flow of energy between two or more electrical motors or comparable AC-impedances and a DC-grid is given in many applications
The RMS value of the DC-link current is described in this paper for a single-inverter as in [5, 6], and for a dual-inverter
As shown in [4, 8,9,10, 12, 13], this shift in the control signals and the resulting current compensation of the DC-link currents leads to a reduced load on the DC-link capacitor and the HV-DC-grid
Summary
THE need of regulating the flow of energy between two or more electrical motors or comparable AC-impedances and a DC-grid is given in many applications. The reduction of the capacitor load of a two-level dual-inverter for the control of two independent electrical machines, as defined in [3, 4], is investigated. This reduction forms the basis for an optimized design of the component. The definitions and relationships discussed in this paper are based on the application of the electric vehicle They can be considered valid for all conceivable industrial applications which use a dual-inverter or multi-phase-inverter with two or more independent three-phase electrical motors. The downsizing of the DC-link capacitor, which is enabled according to [14], creates a potential for reducing costs, weight and volume
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
