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The advent of Silicon Carbide (SiC) devices has made possible high switching frequency operation of PWM power converters. In this paper, SiC devices are compared in detail with Si devices in a high power (1 MW) DC -DC converter application. The converter is designed as the building block for traction drives which requires it to operate at high power, high input voltage (11 kV) and low output voltage...
This paper describes fast analytical model for computation of the switched reluctance machine's (SRM) nonlinear magnetization characteristic and torque lookup table. The flux-tube and the gage-curve methods are used to develop this fast analytical model. Presented model is used for computation of the magnetization characteristic and torque lookup table of three and four-phase SRMs. The simulation...
For high speed bearingless disk drives, certain topologies are advantageous. The authors have published works on a bearingless disk drive for high speeds which is characterized by a slotless stator and a toroid winding set. Several different variations of this setup are imaginable. The ones which this work focuses on are the variation of the number of phases, of the number of coils, and of the applied...
This paper proposes a new type of Modular Multilevel Converter (MMC) applying a three winding transformer. In general, MMC requires a buffer reactor in each arm, which increases number of components and converter footprint. The proposed MMC with three winding transformer does not require the buffer reactors. We describe mathematical properties of the proposed MMC. We also confirmed it operated as...
This paper proposes a 10MW 3.3MJ Energy Storage System consisting of 4000 Flywheels controlled by ICT network. The flywheel has a lot of advantages such as an environmental friendly, long life time, easy manufacturing and etc. The proposed system consists of the many small capacity flywheels and the high speed communication network. Therefore proposed system has a high flexibility from small capacity...
The I type 3L-NPC (Three-level Neutral-Point-Clamped) converter is the most popular multilevel converter used in the renewable energy system for its low switching loss, reduced devices voltage stress. However, it suffers from problems of high conduction losses. The T type 3L-NPC is researched in the literatures to overcome the drawbacks of I type inverter. But, the high side and low side power devices...
This paper examines different winding strategies for reduced capacitance inductors in active power factor correction circuits (PFC). The effect of the parasitic capacitance is analyzed from an electro magnetic compatibility (EMI) and efficiency point of views. The purpose of this work is to investigate different winding approaches and identify suitable solutions for high switching frequency/high speed...
Integrating differential-mode (DM) and common-mode (CM) inductors onto a single core has been expected to miniaturize EMI filters. However, the previously-reported magnetic structure often suffers from saturation by DC current, hindering miniaturization by integration. This problem seems exacerbated by the fact that this conventional structure tends to induce large DC flux because its equivalent number...
The Silicon Carbide (SiC) based devices will become the mainstream in the motor drive technology in the near future. These next generation power devices give benefits of lower losses, higher voltage, and high temperature operation in the power conversion system, realizing its downsizing and high power density. The winding change over technique, on the other hand, is useful to extend the speed control...
This paper presents a comparison study of various motors for application to an electric vehicle (EV) and the potentiality of a ferrite magnet motor as a candidate for rare-earth-less motor for an EV. The rotor shape of the proposed ferrite magnet motor is based on a spoke-type shape. Further, we developed two types of prototypes: one has a large magnetic torque equivalent to a conventional rare-earth...
AC-Choppers using instantaneous voltage control technique to solve voltage sag problems are proposed in this paper. The developed AC-chopper for series voltage sag compensation is applied for three phase four wire system; therefore, three single phase ac chopper circuits and three series transformers are utilized. By using AC-chopper, there are no required for a dc bus; thereupon, the size of proposed...
This paper discusses an electric assisted bicycle which uses electric double layer capacitors (EDLCs) as a power source. EDLCs are charged through a rapid charger by using wireless power transmission. In this paper, first, the energy capacity of EDLCs is designed. Next, the antenna for the wireless power transmission and the charger are investigated. Third, this paper compares the volume and the power...
High power-density bidirectional DC-DC converters consisting of buck and boost converters are widely used in hybrid electric vehicles due to their smaller size and low cost. With a conventional constant-value inductor, the light load efficiency of this converter is greatly reduced because of the large constant peak-to-peak current swing and relatively constant conduction losses that result in the...
This paper presents analysis, simulation and experimental results of two short circuit current limiters, the Thyristor Inserted Reactor and the Thyristor Bypassed Capacitor. The purpose of the fault current limiters is to reduce the overstress of circuit breakers provoked by the network expansion and the consequent increase in fault currents. The simulation and experimental prototype results demonstrate...
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