• Title/Summary/Keyword: Auxiliary inverter

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State monitoring of inverter using auxiliary circuit (보조회로에 의한 인버터 상태 감시)

  • Baek, J.W.;Lee, B.K.;Kim, T.J.;Choi, Y.G.;Kim, G.H.
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1099-1101
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    • 2003
  • The diagnosis of power converter using auxiliary circuit connected to output terminal is proposed and verified by experimental results in this paper. On contrary to conventional diagnosis method, the proposed monitoring technique is possible to measure the state of power converter and unbalanced output caused by a misfiring of switch and unusual control signal. Conventional method gives a monitoring approaches for only a unusual operation of power converter. In this paper, three signals with auxiliary circuit are obtained and analyzed to see the state of electrolytic capacitor, power semiconductor switches and output voltage balance. 2kVA inverter is made and fisted to verify the proposed circuit.

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Utility-Interactive Four-Switch Three-Phase Soft-Switching Inverter with Single Resonant DC-Link Snubber and Boost Chopper

  • Ahmed, Tarek;Nagai, Shinichiro;Nakaoka, Mutsuo;Tanaka, Toshihiko
    • Journal of Power Electronics
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    • v.7 no.2
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    • pp.109-117
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    • 2007
  • In this paper, a novel proposal for a utility-interactive three-phase soft commutation sinewave PWM power conditioner with an auxiliary active resonant DC-link snubber is developed for fuel cell and solar power generation systems. The prototype of this power conditioner consists of a PWM boost chopper cascaded three-phase power conditioner, a single two-switch auxiliary resonant DC-link snubber with two electrolytic capacitors incorporated into one leg of a three-phase V-connection inverter and a three-phase AC power source. The proposed cost-effective utility-interactive power conditioner implements a unique design and control system with a high-frequency soft switching sinewave PWM scheme for all system switches. The operating performance of the 10 kW experimental setup including waveform quality, EMI/RFI noises and actual efficiency characteristics of the proposed power conditioner are demonstrated on the basis of the measured data.

A Characteristics of SPIM with Power Conversions of Auxiliary Winding (보조권선의 전력제어에 따른 단상유도전동기의 특성비교)

  • Park, Su-Kang;Seo, Kang-Sung;Baek, Hyung-Lae;Cho, Geum-Bae;Lim, Yang-Suo;Lee, Seong-Kil;Kim, Dong-Hui
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1149-1151
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    • 2002
  • In this paper, an auxiliary winding driving system of single-phase induction motors is described. Starting charateristics variations are obtained by controlling the auxiliary winding voltage magnitude and phase angle, while the motor's main winding is directly connected to the local utility. A variable auxiliary winding voltage phase angle is shown to yield significant torque control, providing starting and braking torque. The analysis includes the determination of the relationship between the auxiliary winding voltage phase angle and the phase angle difference between the main and auxiliary winding current. The paper proposed for adjusting an auxiliary winding voltage magnitude and phase angle. Experimental results of motor's starting characteristics with using the DC-AMP and PWM inverter for auxiliary winding power supply are shown. The drive is tested using a dynamometer to experimentally verify the results of the theory.

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A Study on Optimized PWM Strategy to Improve Output Voltage Quality of HEP System Boarded on 8200 Series Electric Locomotives (8200호대 전기기관차 객차전원공급장치(HEP)의 출력전압품질향상을 위한 최적화된 PWM 방법)

  • Lee, Eul-Jae;Lee, Jin-Kook;Youn, Cha-Joong;Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.11
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    • pp.1628-1632
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    • 2013
  • HEP(Head Electric Power) system, supplying 3-phase service power to the coach vehicles, is a kind of special auxiliary power equipment which is boarded on 8200 series electric locomotives in KORAIL. This equipment shares high voltage DC link with a main propulsion converter/inverter systems. It was difficult to use high frequency PWM technique so that GTO has been used as a power device same like the main power system. Due to low PWM frequency(300Hz) of HEP inverter, the output voltage has less power quality comparing to normal SIV(Static Inverter) system. In this paper, an optimal PWM strategy is presented for new IGBT type HEP inverter system. Several PWM techniques were investigated to improve output voltage quality under fixed lower filter inductance and not high PWM frequency. Finally PC simulations have been done to clarify its availability.

Induction Heating Water Heater using Dual Mode Phase Shifted ZVS-PWM High Frequency Resonant Inverter (듀얼 모드 위상 시프트 ZVS PWM 제어 고주파 공진형 인버터를 이용한 IH 온수기)

  • Lee, Sang-Wook;Ryu, Yeoi-Joung;Woo, Kyung-Il;Park, Han-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.2
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    • pp.82-89
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    • 2018
  • This paper presents a novel prototype of dual mode control based phase shift ZVS PWM high frequency load resonant inverter with lossless snubber capacitors in addition to a single active auxiliary resonant snubber for electromagnetic induction heating(IH) foam metal based consumer fluid dual packs(DPA) heater. The operating principle in steady state and unique features of this voltage source soft switching high frequency inverter circuit topology are described in this paper. The lossless snubber and auxiliary active resonant snubber assisted constant frequency phase shift ZVS PWM high frequency load resonant inverter employing IGBT power modules actually is capable of achieving zero voltage soft commutation over a widely specified power regulation range from full power to low power. The steady state operating performances of this dual mode phase shift PWM series load resonant high frequency inverter are evaluated and discussed on the basis of simulation and experimental results for induction heated foam metal heater which is designed for compact and high efficient moving fluid heating appliance in the consumer pipeline systems.

New Double-Connected Multi-Step Inverter for SVC Applications (SVC적용을 위한 새로운 이중접속방식의 멀티스텝 인버터)

  • 양승욱;최세완;문건우;조정구
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.6
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    • pp.547-553
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    • 1999
  • A new multi-step voltage source inverter is proposed in this paper. The proposed scheme is composed of t the double-connected 12-step inverter with an auxiliary circuit. The auxiliary circuit includes two voltage d dividing capacitors, two switching devices and a low KV A autotransformer. The resultant system is shown to b be a 24-step inverter suitable for medium power level SVC applications in which the PWM method can not be e employed. A 36-step operation can also be 이)tained by the addition of a bidirectional switch to the ProlXlsed I inverter. The design parameters are derived from the analysis of voltages and currents by means of switching f functions. The validity of the proposed scheme is confirmed by the simulated and experimental results.

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Common-Mode Voltage Elimination with an Auxiliary Half-Bridge Circuit for Five-Level Active NPC Inverters

  • Le, Quoc Anh;Park, Do-Hyeon;Lee, Dong-Choon
    • Journal of Power Electronics
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    • v.17 no.4
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    • pp.923-932
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    • 2017
  • This paper proposes a novel scheme which can compensate the common-mode voltage (CMV) for five-level active neutralpoint clamped (5L-ANPC) inverters, which is based on modifying the space vector pulse width modulation (SVPWM) and adding an auxiliary leg to the inverter. For the modified SVPWM, only the 55 voltage vectors producing low CMV values among the 125 possible voltage vectors are utilized, which varies over the three voltage levels of $-V_{dc}/12$, 0 V, and $V_{dc}/12$. In addition, the compensating voltage, which is injected into the 5L-ANPC inverter system to cancel the remaining CVM through a common-mode transformer (CMT) is generated by the additional NPC leg. By the proposed method, the CMV of the inverter is fully eliminated, while the utilization of the DC-link voltage is not decreased at all. Furthermore, all of the DC-link and flying capacitor voltages of the inverter are well controlled. Simulation and experimental results have verified the validity of the proposed scheme.

Auxiliary resonant DC Link and power loss analysis of three phase voltage type inverter (보조 공진 DC 링크 스너버형 컨버터와 3상 전압형 인버터의 전력손실분석)

  • Kim, J.Y.;Mun, S.P.;Kim, Y.M.;Lee, H.W.;Suh, K.Y.
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1064-1066
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    • 2002
  • This paper proposes a new prototype auxiliary resonant DC link(ARDCL)snubber circuit and deals with its power loss on the basis of actually measured conduction loss characteristic of switching device module. Voltage type soft switching three phase inverter using proposed ARDCL snubber circuit is presented along with its performance evaluations. And, the power loss analysis of three phase hard and soft switching inverter are carried out from the point of simulation and experimental results.

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New 60-Step Inverter System for Medium-to-Large Scale STATCOM (${\cdot}$대용량 STATCOM을 위한 새로운 60-스텝 인버터 시스템)

  • Kim Kiyong;Kim Taehoon;Bae Youngsang;Choi Sewan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.5
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    • pp.450-456
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    • 2005
  • In this paper new 60-step inverter system for medium-to-large scale STATCOM is proposed and operating principle along with control method is detailed. A simple auxiliary circuit is employed to Improve output voltage waveform of 12-step into 60-step. The proposed scheme could be a cost effective approach in high power application such as 10Mvar to 30Mvar STATCOM. Experimental results from a 2KVA laboratory prototype show validity of the proposed method.

A Diode Bridge-type ZVT Inverter for Induction Motor Drive Application (유도 전동기 구동용 다이오드 브릿지-타입 ZVT 인버터)

  • 이성룡;고성훈;권순신;송인석
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.295-298
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    • 1999
  • In this paper, the diode bridge-type ZVT(Zero-Voltage Transition) inverter is proposed. It consists of one auxiliary switch, three resonant inductors and six blocking diodes. So, the advantage of the proposed topology is the reduction of the auxiliary switch. The topology of the proposed ZVT inverter is analyzed with a description of the control conditions based on the load current. Therefore, this paper two control algorithms were discussed. A variable resonant pattern control algorithm by using load current feedback and a resonant period control algorithm by using resonant inductor current feedback is proposed in order to achieve the ZVT switching condition in full control range and the reducing current spike main switches cause by reverse recovery problem.

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