Abstract
In a common dc-link dual-fed open-end winding permanent magnet synchronous motor (OEW-PMSM) topology, it is well known how the additional flow of a zero-sequence current (ZSC) is permitted. The low zero-sequence impedance characteristic of high-speed machines leads to high-intensity and high-frequency ripple of the ZSC. Therefore, there is a necessity to eliminate the zero-sequence-voltage (ZSV) produced by the two voltage source converters that feed the machine. Furthermore, the non-sinusoidal back electromagnetic force (back EMF) causes the circulation of a third harmonic ZSC. An OEW-PMSM high-speed starter-generator fed by a dual-inverter with a single dc-link is considered. Part I of this paper proposes a modulation for the considered topology able to eliminate instantaneously the ZSV produced. In this paper, a detailed analysis of the deadtime (DT) effect on the ZSV has been carried out and a novel hysteresis control for the ZSC using the DT as a control action is presented. The DT produces a ZSV distortion on the zero-axis that can be used to control the third harmonic ZSC flowing due to the non-sinusoidal machine back EMF.
Highlights
One dc supply and a floating bridge [1], two isolated dc power supplies [2] or a single dc supply can be adopted for the dual-fed OEW
Even if the Voltage Source Converters (VSCs)’ ZSV is set to zero thanks to the modulation proposed in Part I and the Dead Time (DT) ZSV distortion is eliminated by the compensation proposed in Section IV-B, from (1) it can be seen that the Zero-Sequence Current (ZSC) would still not be zero due to the third harmonic back EMF of the machine
The experimental set-up is composed by an OEW-PMSM coupled with a DC motor as shown in Fig. 11 while the control board specification can be found in [21]
Summary
One dc supply and a floating bridge [1], two isolated dc power supplies [2] or a single dc supply can be adopted for the dual-fed OEW. As discussed in Part I, many modulations for the single dc link OEW-PMSM drive have been proposed aiming to control to zero the average ZSV produced by the two converters on the controller sampling time [6], [8]–[10]. In this way each ZSV distortion introduced by the DT time can either be compensated or not, in this way full control of the DT voltage distortion on each converter’s leg is achieved. The focus of this work is to develop an alternative way to control the ZSC for the mixed technology dual-inverter selected to control the high speed starter generator OEW-PMSM drive
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