• 대한수학회지
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• 제48권4호
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• pp.775-795
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• 2011

The disturbance attenuation problem for a class of discretetime switched linear systems with exponential uncertainties via switched state feedback and switched dynamic output feedback is investigated, respectively. By using Taylor series approximation and convex polytope technique, exponentially uncertain discrete-time switched linear system is transformed into an equivalent switched polytopic model with additive norm bounded uncertainty. For such equivalent switched model, one designs its switching strategy and associated state feedback controllers and dynamic output feedback controllers so that whole switched model is asymptotical stabilization with H-in nity disturbance attenuation base on switched Lyapunov function and LMI approach. Finally, two numerical examples are presented to illustrate our results.

• 전기학회논문지P
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• 제60권3호
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• pp.144-149
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• 2011

Currently, switched reluctance motors are studied to increase energy efficient. The switched reluctance motor is possible to control higher speed and torque than the induction motors and composition is simple. Current and rotor speed are considered to install the switched reluctance motor. In this paper, Simulink model of the switched reluctance motor is suggested and the adaptive controller is applied to the model for the speed control. Asymmetry converter including the IGBT is concerned with real-time control and the speed of switched reluctance motor is controlled by installing adaptive controller.

• 전기학회논문지P
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• 제60권3호
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• pp.138-143
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• 2011

Electric locomotive is adapted to high speed driving and mass transportation due to obtaining high traction force. The electric locomotive is operated by motor blocks and traction motors. Train speed is controlled by suppling power from motor blocks to traction motors according to reference speed. Speed control of the electric locomotive is efficient by spending energy between motor blocks and traction motors. Currently, switched reluctance motors have been studied because the efficient is higher than induction motors. In this paper, model of the switched reluctance motor is presented and the PID controller is applied to the model for the speed control by using Simulink. Asymmetry converter is used for real-time control and system performance is demonstrated by simulating the speed of switched reluctance motor including PID controller.

• 한국지능시스템학회논문지
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• 제25권2호
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• pp.139-146
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• 2015

본 논문에서는 교정 제어에 의한 스위칭 비동기 순차 머신의 모델 정합 문제를 다룬다. 스위칭 비동기 순차 머신은 스위칭 신호에 따라서 여러 개의 비동기 순차 머신 특성을 번갈아 가면서 가지는 시스템이라고 정의한다. 이번 연구에서 스위칭 시스템이 가질 수 있는 스위칭 시퀀스(sequence)는 일정하게 고정되어 있다고 가정한다. 제어 목적은 폐루프 시스템의 안정 상태 동작을 주어진 기준 모델과 일치시키는 교정 제어기의 존재조건을 규명하고 제어기를 설계하는 일이다. 이를 위해서 스위칭 비동기 머신이 가지는 도달가능성을 표현하는 새로운 skeleton 행렬을 도입하고 모델 정합 교정 제어기의 존재조건을 기술한다. 또한 사례 연구를 통해 스위칭 신호를 생성하면서 동시에 교정 제어 입력을 변화시키는 새로운 교정 제어 알고리듬을 예시한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 A
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• pp.204-206
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• 1997

The disk type Single-phase Switched Reluctance Motor has advantages of constructional simplicity, robustness and low cost. In this paper, We analyze the 3-D model of DSPSRM(Disk type Single-Phase Switched Reluctance Motor) by Finite Element Method for finding optimal design model.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.990-1001
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• 2015

This paper presents analysis of Switched Reluctance Machine (SRM) using Geometry Based Analytical Model (GBAM), Finite Element Analysis (FEA) and Fourier Series Model (FSM) with curve fitting technique. Further a Transient Analysis (TA) technique is proposed to corroborate the analysis. The main aim of this paper is to give in depth procedure in developing a Geometry Based Analytical Model of Switched Reluctance Machine which is very accurate and simple. The GBAM is developed for the specifications obtained from the manufacturer and magnetizing characteristic of the material used for the construction. Precise values of the parameters like Magneto Motive Force (MMF), flux linkage, inductance and torque are obtained for various rotor positions taking into account the Fringing Effect (FE). The FEA model is developed using MagNet7.1.1 for the same machine geometry used in GBAM and the results are compared with GBAM. Further another analytical model called Fourier Series Model is developed to justify the accuracy of the results obtained by the methods GBAM and FEA model. A prototype of microcontroller based SRM drive system is constructed for validating the analysis and the results are reported.

• 한국컴퓨터정보학회논문지
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• 제1권1호
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• pp.25-36
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• 1996

본 논문은 격자 구조 회선 교환 망에서 발생할 수 있는 호 차단 확률 및 failure model을 설정하여 신뢰도를 분석하였다 특히 failure model에서는 link failure 모델을 고려하였다. 대상 모델은.flooding search routing 방식을 사용하여 패킷을 통화 대상자 노드에 전송하였다. 이때. 각 링크failure는 독립적이라고 가정하였다. 이와 같은 failure모델의 성능을 평가하기 위한 방법으로서 joint probability를 이용하여 소규모 격자 구조 회선 교환망의 신뢰도를 분석해 보았으며. 이를 시뮬레이션 한 값과 비교해 보았다 또한. 통신망에서 주요한 성능 지표중 하나8! 호 차단 확률을 구하여 회선망의 신뢰도를 평가하였다.

• Journal of Electrical Engineering and Technology
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• 제9권5호
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• pp.1544-1550
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• 2014

In this paper, an adaptive optimization strategy utilizing Kriging model and genetic algorithm is proposed for the optimal design of electromagnetic devices. The ordinary Kriging assisted by the spherical covariance model is used to construct surrogate models. In order to improve the computational efficiency, the adaptive uniform sampling strategy is applied to generate sampling points in design space. Through several iterations and gradual refinement process, the global optimal point can be found by genetic algorithm. The proposed algorithm is validated by application to the optimal design of a switched reluctance motor, where the stator pole face and shape of pole shoe attached to the lateral face of the rotor pole are optimized to reduce the torque ripple.

• Journal of Power Electronics
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• 제17권4호
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• pp.1097-1108
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• 2017

Accurate calculation of the conduction and switching losses of a power electronic converter is required to achieve the efficiency of the converter. Such calculation is also useful for computing the junction temperature of the switches. A few models have been developed in the articles for calculating the switching energy losses during switching transitions for the given values of switched voltage and switched current. In this study, these models are comprehensively reviewed and investigated for the first time for ease of comparison among them. These models are used for calculating the average amount of switching power losses. However, some points and details should be considered in utilizing these models when switched current or switched voltage presents time-variant and alternative quantity. Therefore, an applicable technique is proposed in details to use these models under the above-mentioned conditions. A proper switching loss model and the presented technique are used to establish a new and fast method for obtaining the average switching power losses in any type of power electronic converters. The accuracy of the proposed method is evaluated by comprehensive simulation studies and experimental results.

• Journal of Electrical Engineering and Technology
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• 제8권2호
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• pp.230-237
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• 2013

This paper presents a novel nonlinear model of Switched Reluctance Generator (SRG) based on wind Energy Conversion system. Closed loop control with based Proportional Integrator current Chopping Control machine model is used. A Power converter in SRG can be controlled by using PI-CCC proposed model, and can be produced maximum power efficiency and minimize the ripple contents in the output of SRG. A second power converter namely PI based controlled PWM Inverter is used to interface the machine to the Grid. An effective control technique for the inverter, based on the pulse width modulation (PWM) scheme, has been developed to make the line voltage needs less power switching devices and each pair of turbine the generated active power starts increasing smoothly. This proposed control scheme feasibility and validity are simulated on SIMULINK/SIM POWER SYSTEMS only.