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The technique of both the electric lightings and the electric vehicles have been more and more grown and the power consumption is very important part. This paper presents a phase shift full bridge(PSFB) converter with the zero-voltage-switching range expansion. In addition, the proposed converter provides both good efficiency and low switching device noise. The experimental and simulation results...
The efficiency improvement of the energy router, based on the solid state transformer, is one of the significant issues for applications in the future power networks. Power losses of switching devices play a key role about the efficiency and have a close relationship with the device, topology and control of the energy router, especially under the diversity of structure. Based on models of actual Si...
To improve the flexibility and stability of microgrid operation, this paper takes the multi-port power electronic transformer (PET) as the connecting interface of microgrid, and the energy storage system (ESS) at the low voltage DC (LVDC) side is controlled to reduce the influence of load or distributed generation (DG) fluctuations on microgrid. The mathematical models of interface stages are also...
This paper discusses the dead-time effect of dual bridge series resonant DC/DC converter (DBSRC). The phase-shift modulation is usually adopted in DBSRC. However, the phase-shift angle is usually small, and voltage polarity reversal (VPR) may occur in dead-time, which may deteriorate EMI/EMC and increase loss. This paper analyzes the commutation of DBSRC when VPR occurs and proposes a method to eliminate...
A fault-tolerance control method for an open-winding multi-disc motor capable of being used in wide speed range applications is designed and introduced. The open-winding method is proven to be effective in field weakening to enhance high speed performance. But the dual inverter may increase the chance of hardware function failure. No additional hardware is required to realize the control method. By...
This paper proposes a new design concept of small air-gap bidirectional Wireless Power Transfer (WPT) system using Dual Active Bridge (DAB) topology. The wireless charging coils are considered as a weakly coupled transformer having relatively high leakage inductance, and thus the new design can obtain soft switching without implementing resonant capacitor or external inductor. This design has a simple...
This paper proposes a three-level bidirectional DC-DC converter with an auxiliary inductor for wide zero-voltage switching (ZVS) in high-output voltage applications. The auxiliary inductor is connected across the middle node of the split flying capacitors and the center tap of the secondary winding in the transformer. The phase-shift angle in three-level stage can facilitate the ZVS of the switches...
Fault detection of shorted turns in the stator windings of Induction Motors (IMs) is possible in a variety of ways. As current sensors are usually installed together with the IMs for control and protection purposes, using stator current for fault detection has become a common practice nowadays, as it is much cheaper than installing additional sensors. In this study, stator currents from the healthy...
In the grid-connected modular multilevel converter (MMC), grid faults not only cause the current to be higher than the rated current, but also bring the unbalanced issues to the inner unbalanced currents and arm voltages. In this paper, a multi-variable coordinated control method which is employed in the d-q coordinate is presented. First, a parameter is introduced in the calculation of the grid currents...
This paper proposed a new Power Electronic Transformer (PET) topology in medium and high voltage application of 3-phase AC distribution network. In the proposed topology, diode clamped multilevel converter is used as the rectifier stage, and input series output parallel (ISOP) Dual Active Bridges are adopted for isolated voltage conversion. The proposed topology is suitable for medium and high voltage...
The semi-controlled open-winding permanent magnet synchronous generation system with a common dc bus provides a flowing path for zero sequence current, which will decrease the efficiency of the whole control system. To solve zero-sequence current of the semi-controlled open winding PMSG system, a model predictive current control (MPCC) method is proposed based on the analysis of the working principle...
Dual active bridge (DAB) with input-series output-parallel (ISOP) structure is capable to interconnect low voltage DC micro grid with medium/high voltage DC distribution grid, named as DC solid state transformer (DCSST). This paper presents a combined decoupling control strategy for the DCSST, which aims to achieve input voltage sharing among sub-modules and enhance voltage control of the parallel...
This paper presents an evaluation of transient electromagnetic phenomena inside lightning protection systems (LPS) model of truss bridge resulting from direct lightning strikes. The simulation model is base on the coupled transmission line network in the frequency domain combined with the Fourier transform technique, which is employed to evaluate the electromagnetic transient surge current distribution...
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