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Permanent Magnet Synchronous Motors (PMSMs) operating among wide speed range needs optimal flux-weakening method to reach to higher speed level. For motors whose critical point locates within the current limit circle, two different flux-weakening algorithms are discussed comparatively in this paper. One is the traditional feedback flux-weakening control strategy, the other is a revised feedback flux-weakening...
This paper presents a solution to the control of the third harmonic of the neutral point in a VIENNA rectifier. A hybrid method combining a dynamic adjustment factor with a voltage deviation control of the split dc link is proposed. The fluctuation of the neutral point has been analyzed and the reason for the third harmonic fluctuation has been described with a mathematic model. In addition to minimizing...
Regarding to reactive power regulation in an active distribution network, PET (power electronic transformer) is considered as a new reactive power control device. Based on understanding of DRs, energy storage devices and PET, we built an optimization model of reactive power for an ADN (Active distribution network) with PET, and adopted PSO (particle swarm optimization) to solve the optimal problem...
The three-phase unbalanced conditions of micro-grid will affect the control performance, so it is required to study the control of asymmetric systems. In this paper, based on three-phase unbalanced micro-grid system, connected with three-phase three-wire voltage source converter (VSC), the effect of asymmetric conditions on the VSC current control was studied. With the application of adaptive discrete...
Large transient grid voltage unbalance will result in deterioration of the doubly-fed induction generators(DFIGs) by introducing over current of rotor side converter(RSC) and double frequency oscillation in dc link voltage and electromagnetic torque. The rotor current controller with the conventional reduced DFIG model, which does not take into account the stator flux transients, could not obtain...
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