نتایج جستجو برای: phase disposition pd pwm
تعداد نتایج: 667970 فیلتر نتایج به سال:
This paper addresses the active torque ripple compensation of a permanent magnet brushless direct-current motor (PMBLDC) drive with new pulse width modulation (PWM) technique and advance angle method. Torque is well-known problem in BLDC motors which produced by discrepancy between stator current back electromotive force (back-emf) waveforms. The advanced method proposed this generates maximum ...
The electrical characteristics of an isolated induction-generator-based system are improved through the association with a voltage-source pulsewidth modulation (PWM) inverter. The electronic converter allows the achievement of a better system behavior in many aspects: voltage regulation, frequency stabilization, and reactive power compensation. The system operation strategy consists of maintain...
In this paper, a seven level asymmetrical cascaded H-Bridge multilevel inverter in three phase configuration using different level-shifted carrier-based pulse width modulation techniques is discussed. Multilevel inverters have become more popular due to high voltage and high power output applications. Comparable to traditional PWM inverters, multilevel inverters are able to reduced switching lo...
Recently, hybrid modular multi-level converters, which are configured as full and half bridge sub-modules, are developed and utilized in the wide area of applications. Compared to its non-hybrid counterpart, these converters have several advantages such as the ability to nullify the DC side fault current and controlling AC side reactive power during the faults. This paper proposes a modified ph...
One of the most common issues in inverters are open-circuit faults (OPF). In this scenario, a proper fault-tolerant technique must be used to improve motor performance. Although basic modulation techniques normally preferred, paper proposes discontinuous pulse-width algorithm (HD-PWM) operate five-phase under single OPF. particular, loss equalization between remaining switches after fault occur...
Under unbalanced supply condition low order harmonics will appear at the input and output terminals of the PWM AC to DC converter. Based on the positive and negative sequence components, an unbalanced transfer matrix in terms of the input phase voltages is derived. An on-line method using a neural network (NN) is used to implement this transfer matrix. It is shown that by using an additional lo...
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