Control Performance Analysis and Improvement of a Modular Power Converter for Three-Phase SRM With Y-Connected Windings and Neutral Line

Abstract

a modular power converter for 3-phase switched reluctance machine (SRM) are analyzed and improved. The converter is implemented by a dual and a six-pack IGBT module, and the phase windings of the SRM are Y-connected and bipolar excited. The performances of the existing control method for this converter are evaluated by simulation and compared with those for the traditional asymmetric halfbridge converter, and the drawbacks, such as big torque ripple and small average torque, are presented. With the new operating modes of phase branch, namely magnetization, freewheeling and demagnetization, improved basic control methods are proposed, which can effectively enhance the performances, flexibility and applicability of the converter. Furthermore, the direct instantaneous torque control, which can reduce the torque ripple, is realized with the converter as well. Several simulations and experiments under different working conditions are carried out to verify the performances of the improved control methods.

Performance Investigation of Switched Reluctance Motor Driven by Quasi-Z-Source Integrated Multiport Converter with Different Switching Algorithms

“…According to the simulation results, Table 2 lists the peak-to-peak values of the electrical torque (∆T e ) along with the steady-state value of the SRM phase current (I ph ). The torque ripple is usually determined in terms of ∆T e as follows [21]:…”

“…By neglecting the mechanical losses, this average torque is equal to the load torque. Thus, at constant load torque, the value of ∆T e is usually used to imply the torque ripple [11,21]. The following points can be inferred from the simulation results:…”

Bidirectional multiport solar‐assisted SRM drive for pure electric vehicle applications with versatile driving and autonomous charging capabilities

“…In [30], electromagnetic design consideration of a six‐phase SRM fed by the standard three‐phase inverter is discussed. A modular power converter formed using a dual and a six‐pack IGBT module for a three‐phase SRM is presented in [31] where phase windings are Y‐connected and bipolar excited. In [32], PV panel feeding a canonical switching cell converter front‐end is connected to a mid‐point SRM converter for solar water pumping application.…”

Cost-Effective and High-Efficiency Variable-Speed Switched Reluctance Drives With Ring-Connected Winding Configuration

“…Furthermore the resulting input power pulsations can necessitate a larger dc link capacitor. The torque ripple can be 70% or more in three-phase SRMs [6,7], and 50% or more in four-phase SRMs [8,9]. The reduction of torque ripple is an active research topic and improvement strategies include machine design optimization [10][11][12] and advanced control techniques [13][14][15][16][17].…”