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This paper proposes a new method to control the frequency fluctuations of the power system with large scale wind farm (WF) installed by using High Voltage Direct Current (HVDC) interconnection and battery systems. The proposed system is designed to decrease the frequency fluctuations. Simulation analysis is performed on a multi-machine power system model composed of synchronous generators (SGs), squirrel...
This paper discusses the reliability characteristics of power electronic devices in aerial vehicles. Either to enable higher degree of electrification of aircrafts or to realize aircraft design with innovative configurations, the importance of electrical networks in aerial vehicles have increased. Based on an observation on the emerging roles of electrical networks in aerial vehicles, the potential...
In this paper, an optimal switching table for PMSM DTC system using zero voltage vector is proposed. Zero voltage vector decreases stator flux and torque very slowly, so it can be used to suppress torque ripple when the system is at steady-state. And when the system is at dynamic-state, non-zero voltage is used to get quicker response. As both 111 and 000 can be used to generate zero voltage vector,...
In recent years, environmental problems are becoming serious and renewable energy systems, especially wind power generation, have attracted much attention and been introduced into power systems. However, wind power generator output is intermittent, resulting frequency fluctuations in the connected power system. A doubly fed induction generator (DFIG) based diesel generation system is proposed in this...
Electric model based in the duality between the electric and magnetic circuit taking into account the misalignment characteristic of transformer of a Wireless Power Transfer, WPT, is proposed. Being a model based in the constructive characteristic of the transformer the model, it represents better the misalignment effect and the simulation values are more accurate in comparison with the T model that...
In this paper, RDFT(Recursive Discrete Fourier Transform) FLL(Frequency Locked Loop) based on DSC-PLL(Delayed Signal Cancellation Phase Locked Loop) is proposed for coping with frequency variation. This method shows significant performance for detection of fundamental positive sequence component voltage when the grid voltage is polluted by grid harmonics and frequency variation. The frequency tracking...
Recently a novel electric hammer driven by tubular permanent magnet linear synchronous motor (TPMLSM) has arouse great interest among researchers in the field of deep drilling for its distinctive advantages compared with hydraulic and pneumatic hammers. The working temperature in deep down-hole is relatively high, so the research of the influence of high temperature in deep hole on the electromagnetic...
The purpose of this paper is to investigate the flux leakage effects in the transverse-flux magnetic gear (MG), in which two typical flux leakage phenomena are identified and analyzed, namely, end leakage and fringing leakage. By using the JMAG 12.1 software, the three-dimensional finite element analysis (3D-FEA) modeling surrounded by some blocks with setting as different material properties are...
Highly dynamic DC-machines, used in low power applications, often contain ironless or so called bell shaped windings. Because there is no massive iron core to support the windings, one of the limiting factors for the torque of the machine is the force on the single wires of the copper weave. Therefore, the knowledge of the force distribution on the single wires could be a helpful design criterion...
We have previously proposed an integrated radial-axial flux rotor permanent magnet synchronous motor for EV traction motor, and confirmed that the motor had almost the same performance as an IPMSM, which uses sintered NdFeB magnet, based on a computer simulation. Our next target is general industrial-use motors, whose design policy is different from EV traction motors with a requisite forced cooling...
This paper investigates the thermal performance of a three-phase 10kW flux-switching permanent magnet (FSPM) machine used as an integrated starter generator (ISG) for hybrid electric vehicles, where the temperature rise experiments are conducted under different operating conditions. Also, the thermal analysis of the FSPM machine is simplified into one-dimensional steady heat conduction with two heat...
Flux-switching permanent magnet machines (FSPMMs) have been investigated for hybrid electric vehicles (HEVs). This paper presents an optimal FSPMM with 12 stator poles to meet the minimal performance specifications required by the drive machine in the 2010 Prius HEV. After a qualitative analysis based on size equation to briefly compare performances of FSPMMs with four rotor topology structures, a...
In the course of treatment and diagnosis of transcranial magnetic stimulation (TMS), the target and non-target are stimulated simultaneously, which produces undesirable side effects. To reduce the risk of such side effects, it is essential to test the stimulation before the real treatment. This paper presents the structure of a magnetic field measurement system for TMS pre-testing. The 3D magnetic...
Hybrid permanent magnet (PM) variable flux memory (VFM) machines employ both the high coercive force PM, i.e. the constant PM (CPM), and the low coercive force PM, i.e. the variable PM (VPM), with which the PM magnetization state can be flexibly regulated to match various operation requirements. These two kinds of PMs can be magnetically connected with either parallel or series configuration so that...
Conventional model predictive control (MPC) presents high steady state ripples due to the application of only one voltage vector during one control period. Furthermore, the enumeration-based evaluation of the cost function poses high computational burden. Recently two-vector-based MPC has been proposed to improve the steady-state performance, but it still requires many calculations to obtain the two...
The GTOs are important device in Korean 8200 series electric locomotive because GTOs which are switches of converter and inverter in main conversion power system frequently fail. Also the price of GTOs are very high. So maintenance cost of GTOs has increasing. In this paper, LCC analysis was conducted for GTOs of the main conversion system in 8200 series electric locomotive. In order to LCC analysis,...
The purpose of this paper is to sum up concerns when designing a gate driver for SiC MOSFETs, and provide two examples. Both of them can detect over current of the power device. One use a gate driver IC and adapt it to meet the requirement of SiC MOSFETs, which is simple and convenient. For better performance in terms of switching frequency and reliability, the other one adopt magnetic transformers...
In this paper, active clamp snubber method was proposed to reduce effectively the switching surge voltage of the conventional quasi resonant (QR) flyback converter. The usefulness and practicality of the proposed method in QR flyback converter were verified through steady-state analysis and its experimental results. The performance of the proposed circuit was compared with the RCD snubber method....
The intermittent and fluctuating energy sources such as photovoltaic power generation system may cause impact on the power grid. In this paper, the key technologies and control methods of distributed photovoltaic / storage system are systematically studied. This paper introduces the overall design scheme and main function of the integrated system include energy storage and distributed photovoltaic,...
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