• 제목/요약/키워드: Variable phase angle control

검색결과 40건 처리시간 0.025초

DAB 컨버터의 전도 손실 저감을 위한 가변 주파수의 단일 위상 시프트 변조기법 (Single Phase-Shift Modulation with Variable-Frequency to Reduce Conduction Losses of DAB Converters)

  • 다오녹닷;이동춘
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2019년도 추계학술대회
    • /
    • pp.124-125
    • /
    • 2019
  • This paper proposes a novel control method to minimize conduction losses of dual active bridge (DAB) converters for on-board chargers of electric vehicles (EVs). In the control method, two variables are regulated, which are the phase-shift angle between the primary and secondary full bridges and the switching frequency. From time-domain analysis, an optimal phase-shift angle is derived to achieve the minimum RMS value of the transformer current. The proposed method was implemented for a 3.6-kW SiC-based prototype to validate its effectiveness. A high efficiency over 97.3% has been achieved for a wide output voltage range.

  • PDF

전기자동차 용 전동식 컴프레서를 위한 스위치드 릴럭턴스 모터의 센서리스 제어 (Sensorless control of Switched Reluctance Motor for Electric AC Compressors of Electrical Vehicles)

  • 전용희;김재혁
    • 조명전기설비학회논문지
    • /
    • 제28권10호
    • /
    • pp.37-42
    • /
    • 2014
  • This paper discusses study of sensorless control of a variable speed switched reluctance motor (SRM) for electric AC compressors on electrical vehicles. A typical SRM drive requires a position sensor such as an encoder or hall sensor to measure the angular rotor position. However, harsh environment in electrical AC compressors for electric vehicles makes it difficult to use the position sensor in their motor drive system. Therefore, a sensorless control scheme for electric compressor motors utilizing magnetic characteristics of SRM with respect to position angle and phase current is proposed. The overall variable speed SRM drive with position sensorless control scheme has been modeled using Matlab/Simulink software and closed loop current control simulation is presented to validate the proposed sensorless drive control.

위상보상기를 가진 인버터로 구동되는 영구자석형 동기전동기의 제어기 설계 (The Controller Design of the Permanent Magnet Synchronous Drive Using a Inverter with Phase Compensator)

  • 유정웅;우광준
    • 대한전기학회논문지
    • /
    • 제37권3호
    • /
    • pp.146-154
    • /
    • 1988
  • The computer simulation of speed and phase control system has been carried out in this study. The load of permanent magnet type synchronous motor is not constant in this system. The cost function method has been used in obtaining the optimal gain of PI controller and the rotor position angle of phase controller has been compensated depending on the load and speed variation. This analysis also shows that the current of d-axis component is zero under the variable a load conditions and the torque per unit current can be maximized.

  • PDF

Analysis of symmetrical three-phase induction motor fed by phase angle controlled sources

  • Abdul-baki, E.M.;Lazim, M.T.;Naser, M.Sh
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
    • /
    • pp.1028-1034
    • /
    • 1989
  • A method of analysis of the steady-state performance of induction motor with supply voltage controlled by cyclically-triggered inline thyristors is presented. Phase-variable model and asymmetrical components are not used in this analysis. Instead, Fast Fourier Transform technique and the method of multiple reference frames are employed to obtain the constant-speed performance of I.M. easily.

  • PDF

가변 위상각제어에 의한 에너지절감형 단상유도전동기에 관한 연구 (A Study on the Energy Saving SPIM Using Variable Phase Angle Control)

  • 박수강;백형래;이상일;임양수;최낙일
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 1999년도 전력전자학술대회 논문집
    • /
    • pp.522-525
    • /
    • 1999
  • This paper describes a simple but effective method for energy saving of ac motors having a widely variable load. The proposed method is based on an optimal efficiency control which is operated by voltage-current pattern such as to maintain the maximum efficiency on the efficiency-output characteristics of the motor, in voltage control with triac. In this paper, authors present the experimental results of the SPIM under controlling of current of main and auxiliary winding by using a one chip microcontroller. Experiments are focused on a capacitor stating single phase induction motor the optimal energy saving are proved by the proposed method.

  • PDF

표적충돌각과 최대가속도 제한을 고려한 최적유도기법 (Optimal guidance with terminal impact angle and control constraint)

  • 류창경;조항주
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
    • /
    • pp.601-606
    • /
    • 1992
  • In this paper, we consider an optimal guidance problem with both the terminal impact angle and control constraints in addition to the usual zero miss distance constraint. We first present the optimal solution of the problem for the missile of an arbitrary order, and show that it is a linear combination of a step response and a ramp response of the missile. Therefore the usual practice of using the control obtained by saturating the optimal solution for the case of unlimited control may result in a large terminal miss. A method called the initial command saturation is suggested to reduce this terminal miss, where the control in the initial phase of guidance is forced to be saturated until a certain condition for a guidance variable is met.

  • PDF

동기기를 사용한 계통연계형 가변속 풍력발전 시스템의 AC-DC-AC 컨버터 구현 및 제어 (Implementation and Control of AC-DC-AC Power Converter in a Grid-Connected Variable Speed Wind Turbine System with Synchronous Generator)

  • 송승호;김성주;함년근
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제54권12호
    • /
    • pp.609-615
    • /
    • 2005
  • A 30kW electrical power conversion system is developed for a variable speed wind turbine. In the wind energy conversion system(WECS) a synchronous generator with field current excitation converts the mechanical energy into electrical energy. As the voltage and the frequency of the generator output vary according to the wind speed, a 6-bridge diode rectifier and a PWM boost chopper is utilized as an ac-dc converter maintaining the constant dc-link voltage with only single switch control. An input current control algorithm for maximum power generation during the variable speed operation is proposed without any usage of speed sensor. Grid connection type PWM inverter converts dc input power to ac output currents into the grid. The active power to the grid is controlled by q-axis current and the reactive power is controlled by d-axis current with appropriate decoupling. The phase angle of utility voltage is detected using software PLL(Phased Locked Loop) in d-q synchronous reference frame. Experimental results from the test of 30kW prototype wind turbine system show that the generator power can be controlled effectively during the variable speed operation without any speed sensor.

간단한 위치검출기를 이용한 SRM 가변속 디지털 제어시스템 개발 (Development of Variable Speed Digital Control System for SRM using Simple Position Detector)

  • 천동진;정도영;이상호;이봉섭;박영록
    • 전력전자학회논문지
    • /
    • 제6권2호
    • /
    • pp.202-208
    • /
    • 2001
  • 스위치드 리럭턴스 모터(Switched Relutance Motor : 이하 SRM)는 이중 돌극형으로 되어있으며, 상권선은 고정자만 사용한다. 다른 어느 전동기보다도 간단한 구조를 가지고 있어 제작단가가 저렴하고, 기계적으로 견고하며, 고온 등의 열악한 환경에서도 신뢰성이 높으며, 브러쉬 등이 없어 유지비가 거의 들지 않는 장점을 지니고 있다. 그러나 SRM은 상여자를 위하여 회전자의 위치정보를 알아야하므로 위치 검출기가 필요하고, 정속도 운전을 위하여 타코 발전기나 엔코더가 부가적으로 필요하다. 그러나 본 논문에서는 회전자의 속도측정을 얻기 위하여 고가의 엔코더를 사용하지 않고, 단지 간단한 슬롯 디스크로부터 위치를 검출하여 속도를 추정할 수 있는 알고리즘을 제시하고 개발하였다. 속도 추정 알고리즘을 적용한 가변속 디지털 제어시스템을 구현하기 위하여 TI사의 TMS320F240-20MIPS 고정 소수점 연산용 프로세서를 사용하였다. 개발한 시스템을 실험한 결과 넓은 범위에 걸쳐 속도제어가 가능하였고, 단일 펄스모드, 하드 쵸핑모드 및 소프트 쵸핑모드 뿐만 아니라, 전류제어 동작모드에서 가변속 제어가 가능하였다. 그리고 어드밴스각 제어가 가능하였다.

  • PDF

마이크로프로세서를 이용한 3상 브리지 콘버터의 제어회로 설계에 관한 연구 (A Study on the Design of a Control Circuit for Three- Phase Full Bridge Converter Using Microprocessor)

  • 노창주;김윤식;김영길;유진열;류승각
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제16권4호
    • /
    • pp.102-112
    • /
    • 1992
  • The three-phase full(6-pulse) bridge controlled rectifier is one of the most widely used types of solid-state converters in DC drive applications for higher performance. In most of the previous designs, the gate control circuits of the converter have been designed with analog method which can be easily affected by noise. Nowdays with advances of microelectronics and power electronics, microprocessor and pheripal LSIs are increasingly used for eliminating this problems. In this paper, a novel general-purpose microprocessor -based firing system and control scheme for a three-phase controlled rectifier bridge has been developed and tested. Using the phase relations between ${\Delta}$-Y transformer in power operation part, gate pulse of the converter is generated with real time process so that microprocessor may share its time to control algorithms efficiently. The firing angle of the converter is smoothly controlled in the range of 0 $^{\dirc}$ to 180$^{\dirc}$ with a fast respone and a constant open loop gain, even for the case where the converter is fed by a weak AC system of unregulated frequency. The hardware and software control circuit implementation built around a 80286 microprocessor is discussed, and the experimental results are given. This scheme uses less hardware components and has higher dynamic performance in variable speed DC drive applications.

  • PDF

SRM의 최대 에너지비를 갖는 단일 펄스 스위칭방식에 관한 연구 (The Study of SRM on the Single Pulse Switching Control With Maximum Energy Ratio)

  • 박성준;안진우
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제51권4호
    • /
    • pp.165-173
    • /
    • 2002
  • The goal of this paper is optimal switching angle of switched reluctance motor drive system fur maximum energy ratio. A new magnetizing method with a low-frequency increasing the energy conversion ratio that is related to the efficiency of motor is proposed. As the results, it improved the efficiency about 2[%]. And a torque ripple is also sufficiently reduced compared with that of the conventional approach. In order tn start softly regardless of large ripple torque, the profile of phase current is predicted by the ANFIS, and current control mode was adapted when it is operated under the starting speed. Variable implementations en the fields will guarantee the more practical drive system.