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The combined application of transformer economic operation and inrush current restraining technology is proposed in this paper to minimize negative impacts of the inrush current on the transformer and the electric power system during transformer economic operation. The principle of the generation of magnetizing inrush current is discussed, then phase selection switching technology is analyzed which...
The paper proposes a novel dual-redundancy permanent magnet synchronous motor(DRPMSM) with low thermal coupling and non-electromagnetic coupling between windings of different phases which is sufficient in a range of safety-critical applications. Considering the serious consequences, three-phase short circuit is analyzed in detail and characteristics of short-circuit current and corresponding braking...
Parallel operation systems constructed quickly and inexpensively by combining two or more existing electric power converters have a lot of flexibility. However, it is important to suppress a cross current flows between the electric power converters. This paper proposes a three inputs combination reactor for parallel operation systems composed three electric power converters.
Large-capacity parallel operation systems constructed quickly and inexpensively by combining two or more existing electric power converters have a lot of flexibility. However, it is important to suppress the cross current flows between the converters. This can be done by controlling the system while miniaturizing the combination reactor. In this paper we elucidate the suppression performance of various...
In this paper, a novel vector control strategy for variable frequency AC (VFAC) power system based on the dual stator-winding induction generator (DWIG) is proposed. The mathematical model of DWIG is investigated, which shows the model of DWIG can be simplified as a single stator-winding induction generator when the two sets of stator windings are tight coupled. The simulation results verify the principle...
Energy router is defined and developed along with the new concept of energy internet. This paper presents an AC-DC hybrid multi-port energy router for power distribution networks, which consists of high voltage AC port, low voltage AC port and low voltage DC port. Based on the description of its circuit topology and control strategy, the design of the main parameters is analyzed in details. The relationship...
At present, the battery management system (BMS) of lots of electric vehicles (EV) with different types cannot communicate normally with AC charging piles in residential quarter. The paper proposed a coordinated charging strategy for EV aggregator in residential quarter without collecting the state of charge (SOC) of EVs. The method obtains the constant charging time of EVs by certainty analysis, then...
Subsynchronous resonance risk assessment in power system is mainly accomplished by offline simulation analysis, for a practical project, researchers have to consider all kinds of possible typical system operation modes, which might be a huge amount for a large-scale transmission system. This paper comes up with subsynchronous resonance online monitoring, analyzing and early-warning technologies, applies...
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