New Integrated Multilevel Converter for Switched Reluctance Motor Drives in Plug-in Hybrid Electric Vehicles With Flexible Energy Conversion

Abstract

This paper presents an integrated multilevel converter of switched reluctance motors (SRMs) fed by a modular front-end circuit for plug-in hybrid electric vehicle (PHEV) applications. Several operating modes can be achieved by changing the on-off states of the switches in the front-end circuit. In generator driving mode, the battery bank is employed to elevate the phase voltage for fast excitation and demagnetization. In battery driving mode, the converter is reconfigured as a four-level converter, and the capacitor is used as an additional charge capacitor to produce multilevel voltage outputs, which enhances the torque capability. The operating modes of the proposed drive are explained and the phase current and voltage are analyzed in details. The battery charging is naturally achieved by the demagnetization current in motoring mode and by the regenerative current in braking mode. Moreover, the battery can be charged by the external AC source or generator through the proposed converter when the vehicle is in standstill condition. The SRM-based PHEV can operate at different speeds by coordinating the power flow between the generator and battery. Simulation in MATLAB/Simulink and experiments on a three-phase 12/8 SRM confirm the effectiveness of the proposed converter topology. Index Terms-Fast excitation and demagnetization, front-end circuit, multilevel voltage, flexible battery charging, plug-in hybrid electric vehicle (PHEV), switched reluctance motor (SRM).

A Cascaded Multilevel Inverter Using Only One Battery with High-Frequency Link and Low-Rating-Voltage MOSFETs for Motor Drives in Electric Vehicles

“…Three-phase switched reluctance (SR) motor drives with integrated charging functions are proposed in [28,29]. Less active switches are adopted in [28], and a three-phase rectifier is used to connect with the internal combustion engine (ICE) generator and the grid.…”

Stochastic Stability Analysis of the Power System with Losses

“…In this paper, an SMIB system with losses is underscored, whose model is as follows: dδ/dt = ω N ω Mdω/dt = P − EUB 12 sin δ − EUG 12 cos δ − Dω (1) where δ denotes the rotor angle of the machine with respect to infinite bus; ω denotes the rotating speed of the machine; M denotes the inertia coefficient of the machine; D denotes the damping coefficient of the machine; U is the voltage of the infinite bus; P = P m − G 11 E 2 , where P m denotes the mechanical power, E is the voltage behind direct axis transient reactance, and G 12 (G 11 ) denotes the conductance of the element in the first row and second (first) column of the reduced admittance matrix; B 12 denotes the susceptance of the element in the first row and second column of the reduced admittance matrix; and ω N denotes the synchronous machine speed. The losses from the transmission systems and transfer conductances are expressed by EUG 12 cosδ.…”

“…However, SCDs were considered small in power systems previously. Nowadays, renewable energy and electric vehicles have become integrated into to power systems [1][2][3]. Recently, it has been shown that wind power output is an intermittent energy resource [4][5][6].…”

Cost‐efficient nonisolated three‐port DC‐DC converter for EV/HEV applications with energy storage

“…Buck‐boost converters are single‐input single‐output (SISO) model and do not have any energy storage device. A switch reluctance motor drive integrated with a fast controller and a SISO converter are presented .…”

“…A switch reluctance motor drive integrated with a fast controller and a SISO converter are presented. 5,6 High-frequency galvanic isolation is achieved in the grid-connected inverter system through a transformer. 7 For the buck-boost converter 8 to operate with a wide voltage conversion range, it requires two more switches than the conventional buck-boost dc-dc converter.…”