Abstract
Recently, a dual inverter motor drive feeding an open-end winding permanent magnet (PM) motor has been studied, aiming for the improvement of total efficiency and a fault tolerant function of hybrid and electric vehicles. The authors have studied the fault tolerant operation of the DC-bus battery, where the failed inverter is operated only with a capacitor across the DC-bus and a space vector modulation (SVM) is employed to regulate the capacitor voltage. In our previous research, the SVM techniques for the fault tolerant operation in a low-modulation-index have been proposed. However, it was difficult to have fault tolerance in a high-modulation-index case. The voltage margin in the fault situation is limited because the failed inverter is operated with the capacitor. In this paper, the SVM technique to achieve the fault tolerant operation in the high-modulation-index state is investigated. The novel point of this paper is that the proposed technique introduces a field-weakening control in order to reduce the command voltage vector within the controllable voltage region. The proposed technique was verified through experimental tests and its operational characteristics were compared with the normal operation, from the viewpoints of the total harmonic distortion (THD) and the efficiencies of the inverters and the motor.
Highlights
A dual inverter motor drive feeding an open-end winding permanent magnet (PM) motor has been focused on, aiming for improvement of a total efficiency and a fault tolerant function of hybrid and electric vehicles
In the dual inverter motor drive studied in this paper, the DC-bus batteries are isolated in order to secure a fault tolerant function
Experimental setups of the dual inverter motor drive are conducted as shown in Figure 12 and Experimental of the dual inverter motor drive13
Summary
A dual inverter motor drive feeding an open-end winding PM motor has been focused on, aiming for improvement of a total efficiency and a fault tolerant function of hybrid and electric vehicles. In the dual inverter motor drive studied in this paper, the DC-bus batteries are isolated in order to secure a fault tolerant function. The discharging topology of the battery voltage of the other inverterbyincharging the normal operation by the operation thetopology fault situation the sameinasthe thefault dualsituation inverter motor drive,as where one inverter of the DC-bus capacitor.in. Was difficult to achieve the fault tolerant voltage of the side inverter is reduced by half, other words, margin the faultis operation at afailure high-modulation-index, because the in DC-bus voltagethe of voltage the failure sideofinverter tolerant limited. SVMtechnique techniquefor forthe the fault tolerant operation high-modulation-index newly proposed, whichwhich controls the voltage command within thewithin limitedthe voltage region by employing a is newly proposed, controls the voltage command limited voltage region by field-weakening control technique.
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