• Title/Summary/Keyword: inverter control system

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Study on Grid-Connected Photovoltaic System using Current-Source Inverter (전류형 인버터를 이용한 계통 연계형 태양광 발전 시스템에 관한 연구)

  • Lim, J.M.;Park, S.J.;Lee, S.H.;Moon, C.J.;Choi, J.H.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.677-681
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    • 2005
  • This Paper presents a 6 pulse shift operation control mode of current-source-inverter to make improvement of efficiency and to reduce the frequency of inverter switching for photovoltaic generation system using PWM current-source-inverter. This system is connected solar cell energy directly without using a storage cell. The proposed circuit can maintain maximum voltage of photovoltaic generation of take advantage of six Buck-Boost converter and a full-bridge inverter determines the polarity of AC output. That is controlled by using digital signal processor TMS320F2812 for operation about a 6 pulse shift operation control of current-source-inverter, and it is verified through the experimental results.

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A General Purpose Inverter Set-Up for Power Electronics Laboratory Experiments

  • Kayakesen, Mustafa Erman;Cadirci, Isik
    • Journal of Power Electronics
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    • v.10 no.4
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    • pp.434-443
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    • 2010
  • A general purpose experimental set-up has been designed and implemented for students to carry out various experiments on inverters in the power electronics laboratories of universities, during a few hours of laboratory work. This is the first inverter setup that incorporates hardware and software control, as well as an optional user interface in a laboratory experimental set-up of a single multi-purpose inverter, thus making the system versatile and very practical for both undergraduate and graduate students. The system can be controlled either by a computer or through a liquid crystal display (LCD) and a keypad control unit, and it constitutes a low-cost alternative to relatively expensive commercial teaching sets. The computer provides a user friendly interface and easier control for laboratory environments equipped with computers. The LCD and keypad units eliminate the need for a computer, which makes this system usable in the laboratory as a standalone unit as well.

A New Half-bridge Resonant Inverter with Load-Freewheeling Modes

  • Yeon, Jae-Eul;Cho, Kyu-Min;Kim, Hee-Jun
    • Journal of Electrical Engineering and Technology
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    • v.2 no.2
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    • pp.249-256
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    • 2007
  • This paper presents a new circuit topology and its digital control scheme for a half-bridge resonant inverter. As the proposed half-bridge inverter can be operated in load-freewheeling modes, the pulse-width modulation (PWM) method can be used for the output power control. The proposed half-bridge inverter is based on the resonant frequency-tracking algorithm with the goal of maintaining the unity of the output displacement factor of the load impedance even in varying conditions. In this paper, the operation principle, electrical characteristics, and detailed digital control scheme of the proposed half-bridge resonant inverter are described. The experimental results of the prototype experimental setup to verify the validity of the proposed half-bridge inverter are presented and discussed.

A New Hybrid Control Scheme with Active-Clamped Class-E Inverter system of Induction Heating Jar for High Power Applications (고 전력 응용을 위한 유도가열 Jar용 Active-Clamped Class-E 인버터 시스템의 새로운 Hybrid 제어 기법)

  • Lee, Dong-Yun;Lee, Min-Kwang;Hyun, Dong-Seok;Kim, Jung-Chul;Choi, Ick
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1009-1011
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    • 2001
  • This paper presents a new hybrid control scheme using Active-Clamped Class-E (ACCE) inverter of induction heating(IH) jar for high power applications. The proposed hybrid control scheme has characteristics, which act as class-E inverter at lower switch voltage and ACCE inverter at higher switch voltage than reference voltage of the main switch by feeding back voltage one as well as advantages of conventional ACCE inverter such as zero-voltage switching(ZVS) of the main switch and the reduced switch voltage due to the clamping circuit. Moreover, the proposed control method makes higher output power than conventional ACCE inverter control one since ACCE inverter is operated like class-E inverter at low voltage condition. The principle of the proposed control are explained in detail and the validity of the proposed control scheme is verified through the several interesting simulated and experimental results.

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SINGLE-PHASE CURRENT SOURCE INVERTER WITH PULSE AREA MODULATION SCHEME FOR SOLAR POWER CONDITIONER

  • Hirachi, K.;Matsumoto, K.;Ishitobi, M.;Ishibashi, M.;Nakaoka, M.
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.724-729
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    • 1998
  • In general, a single-phase current-fed PWM inverter using IGBTs has some unique advantages for small scale distributed utility-interactive power supply system as compared with voltage-fed PWM inverter. In particular, this is more suitable and acceptable for a non-isolated type utility-interactive power conditioner, which is going to be widely used for residential solar photovoltaic (PV) power generation system in Japan. However, this current-fed PWM inverter has a significant disadvantage. The output current of this inverter includes large harmonic contents when the inductance of smoothing reactor in its DC side is not large enough to eliminate its current ripple components of this inverter. In order to overcome this problem, a new conceptual pulse area modulation scheme for this inverter is introduced in difference with conventional PWM strategy. This paper presents a new effective control implementation of this PV power conditioner which is able to reduce the harmonic component in the output current produced by the single-phase current-fed PWM inverter even when the ripple current in the smoothing DC reactor is relatively large. The operating principle of the proposed control strategy introdued for this inverter system is described, and its simulation results are evaluated and discussed herein.

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The Study of 3-Phase Bi-Directional DC to AC Inverter for the Bi-Model PV PCS (자립형 태양광 발전 시스템을 위한 3상 양방향 DC-AC 인버터 연구)

  • Yang, Seung-Dae;Jung, Seung-Hwan;Choi, Ju-Yeop;Choy, Ick;Lee, Young-Kwon
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.319-324
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    • 2012
  • This paper presents the study of 3-Phase bi-directional DC to AC inverter with unity power factor. 3-Phase bi-directional DC to AC inverter is important for the bi-modal PV PCS with an energy storage system. Both Inverting and converting are needed to connect between the grid side and boost converting side to charge and discharge the energy storage system. The paper proposes the appropriate circuit topology and proper control system for the bi-directional inverter. It also proposes the method of selecting the optimum control method considering system stability. PSIM simulation is used to validate the proposed algorithm.

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Characteristics of Temperature Control in the Inverter Type Oil Coolers (인버터 타입 오일냉각기의 온도제어 특성에 관한 연구)

  • 이상호;이찬홍;박천홍
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.233-236
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    • 2003
  • In this Paper, the temperature control error and cooling characteristics of inverter typ coolers are evaluated to predict application validity of coolers under heating pattern and amount The temperature control error of coolers small in 15~70% range of the max. cooling ability. At less than 15% of max. cooling ability has the inverter type cooler a basic temperature control error $\pm0.5^{\circ}C$ and acts as on/off type coolers. The inverter type cooler is unsuitable for precision temperature control under the complex heating pattern. But PID control of cooler including the heating system is an alternative for the case.

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Design of High Speed Drive (고속 SRM 구동시스템 설계)

  • Kim, Tae-Hyoung;An, Young-Joo;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2006.04b
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    • pp.95-98
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    • 2006
  • This paper proposes high speed SRM drive system for blower with a new 4-level inverter and precise excitation position generator. For the high speed blower, a proper inverter and control method are proposed and the output characteristics are analyzed. In order to get a fast build-up and demagnetization of excitation a current, 4-level inverter system is proposed. The proposed 4-level inverter has additional charge capacitor, power switch and diode in the conventional asymmetric converter. The charged high voltage is supplied to the phase winding for fast current build-up, and demagnetization current is charged to additional capacitor of 4-level inverter. In addition, a precise excitation position generator can reduce turn-on and turn-off angle error according to sampling period of digital control system. The proposed high speed SRM drive system is verified by computer simulation and experimental result.

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Novel Control and Design Method for Wide Stability Range of Grid Connected Inverter with LCL Filter (LCL 필터를 사용하는 계통 연계형 인버터의 넓은 안정 영역을 갖는 새로운 제어 및 설계 기법)

  • Park, Kwon-Sik;Seo, Byung-Jun;Kim, Hak-Soo;Nho, Eui-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.6
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    • pp.440-445
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    • 2018
  • This study proposes a novel control and design method for a grid-connected inverter with an LCL filter without damping. The current resonance phenomenon must be considered when designing the grid-connected inverter system with an LCL filter. Passive or active damping is used in the inverter system to reduce the resonant current. However, passive damping reduces the efficiency of the system, and active damping methods are complex. If the resonant frequency is in a specific region, then the system will be unstable. This study examines the process of stabilizing the entire region without resonant damping. The validity of the proposed method is verified through simulation and experimentation.