Integrated Battery Charger for Electric Vehicles Based on a Dual-Inverter Drive and a Three-Phase Current Rectifier

Abstract

This paper presents a new three-phase battery charger integrated with the propulsion system of an electric vehicle. The propulsion system consists of a dual-inverter topology connected to an induction motor via open windings. The electrical vehicles (EV) batteries are divided by two inverters. This will result in a drive with multilevel characteristics reducing the total harmonic distortion (THD) of the voltage applied to the motor. The modularity of the multilevel inverter will be maintained since two classical three-phase inverters are used. The charger will be fed by a three-phase high power factor current source rectifier. The motor windings will take the role of the DC-inductor required by the rectifier. In this way, an intermediate storage element between the grid and the batteries of the vehicle exist. For the control system of the battery charger, we propose the use of the instantaneous power theory and a sliding mode controller for the three-phase charger input currents. Finally, to verify the behavior and characteristics of the proposed integrated battery charger and control system, several tests are be presented.

A Review of Integrated On-Board EV Battery Chargers: Advanced Topologies, Recent Developments and Optimal Selection of FSCW Slot/Pole Combination

“…Another three-phase integrated charger that adopts a novel technique for charging the battery without changing the motor winding connection is shown in Fig. 20 [70]. The suggested charger utilizes dual inverters which allows multilevel operation while employing a two-level three-phase VSI.…”

Variable Pulse Density Modulation for a Buck-Type Three-Switch Current Source Rectifier

“…Table 2 summarizes all the valid switching states for the VPDM algorithm in all 12 input sectors. Let δ pdm.Sk (n) be the pulse density distribution function of switch S k (k = a, b, c), in which each pulse has a width of D, as illustrated in Figure 6a; switch S a has a density of 15/16 at the block under consideration, while the instantaneous phase currents can be presented as in (6) as functions of these pulse density distribution functions (n is the block index).…”

“…In each sector, the magnitude of the maximum instantaneous current in (6) should be proportional to the magnitude of the highest absolute instantaneous line-…”

“…However, in some voltage step-down applications requiring a wider input voltage range and limited output current in cases of output short circuiting, the CSR configuration (see Figure 1) is preferred to adding another DC/DC stage after the VSR. Moreover, CSRs are widely used not only in mediumvoltage high-power applications (with symmetric gate commutated thyristors or gate turn-off thyristors) due to their simple structure and short-circuit protection 5 but also in low-power systems such as motor speed control 6 , induction heating 7 , electric vehicle chargers 8 , and telecommunication power supplies 9 . The modulation methods used in CSRs can be divided into two groups: offline and online.…”