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This paper proposes a discretization method suitable for real-time simulators using Forward Euler method. Realtime simulation using Forward Euler method have the following problems. One is simulation error caused by time step limitation, and another is delay in simulated waveforms. The authors have proposed a simulation method suitable for real-time simulators, but there is a problem that physical...
In this paper, effects of the recently found mix-mode (MM) conducted electromagnetic interference (EMI) noise emissions on the boost-type power factor corrected (PFC) pulse-width modulated (PWM) rectifier are first introduced. A practical PFC EMI filter design method with consideration of the MM emissions is given. The proposed method can be easily implemented in commercially-available EMI filter...
Comparing to the most common reliability tests this work presents a new approach of accelerated testing, by combining temperature, humidity and pressure cycling with voltage stress. A design of experiments methodology has been proposed to test IGBT inverters and understand environmental factors effect. The humidity-pressure combination effect is studied for various IGBT inverter packaging materials.
This paper proposes a combined steady state (SS) and dynamic model of a proton exchange membrane fuel cell (PEMFC) for use in distributed generation (DG) systems simulation. The SS fuel cell parameters associated with ohmic loss, activation overpotential and concentration over potential which are not easily accessible are estimated using a non-linear fitting of measured V-I fuel cell characteristics...
This paper presents dynamic voltage restorers (DVRs) which are employing a PWM ac-ac converter. The shunt-series and series-shunt configurations are shown along with the operating principles when using the basic PWM ac-ac converter topologies such as buck, boot and buck-boost converters. The steady state analysis is carried out for an example case, the DVR with buck ac-ac converter. Also, this paper...
In the Tokaido Shinkansen, the instantaneous feeding power of substations increases because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases further, it will not be possible to maintain the feeder voltage if the power converter supplies only reactive power. Assuming such a situation in the frequency...
The Distributed Power Flow Controller (DPFC) is a new device within the FACTS family. It is emerged from the UPFC and has relatively low cost and a high reliability. The DPFC consists of two types of converters that are in shunt and series connected to grids. The common dc link between the shunt and the series converters is eliminated. The active power exchange between the shunt and series converters...
This paper presents an output current control method for grid-connected voltage-source inverter (VSI) with LCL output filter. LCL filter has been shown to provide a high attenuation to high-frequency harmonics with small physical size than other types of filters, like L and LC filters. However, filter oscillation is the major concern in this type of filter. Different passive and active damping methods...
The influence of instantaneous voltage drops in the power systems due to lightning have become a significant issue, because manufacturing facilities have become highly sophisticated and intelligent. On the other hand, it may be impossible to completely avoid instantaneous voltage drops in power systems caused by natural phenomena. In order to solve the problem of the voltage drops, this paper presents...
Future electric vehicles (EVs) will be linked to the electric power system infrastructure; the vehicles will operate through frequent electric charging, as is the case with electric trains. Conventional batteries require a long recharging time; therefore, supercapacitors, rather than batteries, will play an important role in the future for charging of EVs. Recently, we manufactured small EVs powered...
A new position-sensorless method has been developed for a permanent magnet synchronous motor (PMSM) drive at low speed. This method utilizes the induced voltage caused by magnetic saturation of PMSM. The rotor position can be detected by using the open phase voltage of a conventional 120-degree commutation. No harmonic injection is needed. This paper discusses the principle of the proposed method...
In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave energy conversion devices such as the Oscillating Water Column, Pelamis, the Wave Point Absorbers and the Wave Dragon are developed by employing the most efficient...
A sensorless control strategy for a permanent magnet synchronous generator (PMSG) in variable speed wind energy conversion system (WECS) is proposed. The proposed method is based on recursive least square estimation (RLSE) algorithm for rotor speed estimation using an equation containing only stator flux and current. Further, rotor position information used for coordinate transformation is computed...
This paper proposes a generalized scheme of new soft-switching interleaved boost converters which is suitable for high step-up and high power applications. The proposed converter is configured with proper numbers of series and parallel connected basic cells in order to fulfill the required output voltage and power levels, respectively. This leads to flexibility in device selection resulting in high...
Soft-switching techniques are an enabling technology to further reduce the losses and the volume of automotive dc-dc converters, utilized to interconnect the high voltage battery or ultra-capacitor to the dc-link of a Hybrid Electrical Vehicle (HEV) or a Fuel Cell Vehicle (FCV). However, as the performance indices of a power electronics converter, such as efficiency and power density, are competing...
We have proposed a magnetic levitation control system for flexible steel plates and confirmed its feasibility through a digital control experiment. However, there is a risk that side slipping or the dropping of the plate may occur owing to inertial force, because the levitation control system does not provide any restraints for the direction of travel. Therefore, we have proposed the addition of electromagnetic...
This paper deals with a design method of LCL filter for grid-connected three-phase PWM voltage source inverters (VSI). By analyzing the total harmonic distortion of the current (THDi) in the inverter-side inductor and the ripple attenuation factor of the current (RAF) injected to the grid through the LCL network, the parameter of LCL can be clearly designed. The described LCL filter design method...
This paper is concerned with a new method for a derivation of frequency response of an actuator with solid iron core. This actuator is designed for a magnet bearing of thrust-direction at a high-speed motor. The rotor of this motor is levitated by magnetic bearings. Authors developed a high-speed permanent magnet synchronous motor and other components of this system including the magnet bearings and...
PM motor drive systems are widely used for industrial drives. However, PM motors basically produce the torque ripple due to the fluctuation of the magnetic field distribution. Dead time of the inverter, offset of sensors and current measurement errors lead to the torque ripple, too. The torque ripple leads vibration noises. In this paper, we proposed a torque ripple suppression method based on perfect...
This paper propose a new current control system for IPMSM to reduce harmonic currents caused by the overmoduration and a non-sinusoidal magnetic flux distribution on the rotor. The harmonic currents have problems with making a current control system of IPMSMs unstable easily. The proposed current control system has two current controllers. One of them controls fundamental current to satisfy the required...
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