• Title/Summary/Keyword: Current power generation

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PWM Variable Carrier Generating Method for OEW PMSM with Dual Inverter and Current Ripple Analysis according to Zero Vector Position (듀얼 인버터 개방 권선형 영구자석 동기 전동기 제어를 위한 PWM 가변 캐리어 생성법 및 영벡터 위치에 따른 전류 리플 분석)

  • Shim, Jae-Hoon;Choi, Hyeon-Gyu;Ha, Jung-Ik
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.4
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    • pp.279-285
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    • 2020
  • An open-end winding (OEW) permanent magnet synchronous motor with dual inverters can synthesize large voltages for a motor with the same DC link voltage. This ability has the advantage of reducing the use of DC/DC boost converters or high voltage batteries. However, zero-sequence voltage (ZSV), which is caused by the difference in the combined voltage between the primary and secondary inverters, can generate a zero-sequence current (ZSC) that increases system losses. Among the methods for eliminating this phenomenon, combining voltage vector eliminated ZSV cannot be accomplished by the conventional Pulse Width Modulation(PWM) method. In this study, a PWM carrier generation method using functionalization to generate a switching pattern to suppress ZSC is proposed and applied to analyze the control influence of the center-zero vector in the switching sequence about the current ripple.

A Bidirectional Single-Stage DC/AC Converter for Grid Connected Energy Storage Systems

  • Chen, Jianliang;Liao, Xiaozhong;Sha, Deshang
    • Journal of Power Electronics
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    • v.15 no.4
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    • pp.1026-1034
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    • 2015
  • In this paper, a unified control strategy using the current space vector modulation (CSVM) technique is proposed and applied to a bidirectional three-phase DC/AC converter. The operation of the converter changes with the direction of the power flow. In the charging mode, it works as a buck type rectifier; and during the discharging mode, it operates as a boost type inverter, which makes it suitable as an interface between high voltage AC grids and low voltage energy storage devices. This topology has the following advantages: high conversion efficiency, high power factor at the grid side, tight control of the charging current and fast transition between the charging and discharging modes. The operating principle of the mode analysis, the gate signal generation, the general control strategy and the transition from a constant current (CC) to a constant voltage (CV) in the charging mode are discussed. The proposed control strategy has been validated by simulations and experimental results obtained with a 1kW laboratory prototype using supercapacitors as an energy storage device.

Current Control of 12-pulse Dual Converter for High Current Coil Power Supply (대전류 코일 전원 공급장치를 위한 12펄스 듀얼 컨버터의 전류제어)

  • 송승호
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.4
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    • pp.332-338
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    • 2002
  • High current coil power supply for superconductivity coil of tokamak requires fast dynamics performance of di/dt and smooth change over of current direction. To meet the specification high performance DSP-based controller Is designed for 12-pulse thyristor dual converter with interphase transformer(IPT). Not only the total current of Y and $\Delta$ converter units but also the difference for those should be regulated fast and accurately. Proportional and integral controller is designed for current difference control and the controller output is compensated to $\Delta$ converter. The source voltage phase angle detection and gate pulse generation algorithm are implemented in software for higher reliability of current control. The current error Is reduced by selection of appropriate initial gating angle during the transient of change over of current direction between thyristor converters.

The analysis of power quality characteristics in high speed train through neutral section of catenary system (절연구간운행 고속철도차량 전력품질 특성 분석)

  • Hong, Hyun-Pyo;Choi, Eui-Seong;Lee, See-Bin;Lee, Hee-Soon
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.634-643
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    • 2011
  • The neutral section was installed in order to prevent conflict with different phase angle source in electric railway catenary system. The speed of electric train reduced due to coasting operation by notch off when it passed the neutral section. And, the catenary wire was damaged and the accident might be happened because of the arc generation when the electric train passed the neutral section with notch off condition. The inrush current of main transformer installed tiling train is analyzed during the operation of MCB(main circuit break) passing through the neutral section. The instantaneous waveform of load current were analyzed in case of powering and regenerative braking. Inrush current waveform with run of AC railway train showed that inrush current waveform and harmonics, the inrush current generated from main transformer in train has bad effects on power quality problem. In order to reduce these inrush currents, the MCB is connected when the phase angle of voltage is 90 degree. This paper is to measure inrush current and harmonics in main transformer of high speed train in neutral section of electric railway. This measurement report is used to control minimum inrush current in algorithm and power phase angle.

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Profitability Analysis of ESS with PV Generation (PV연계형 ESS의 설치 규모에 따른 수익영향)

  • Kim, Chang Soo;Choi, Sang Bong
    • Current Photovoltaic Research
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    • v.8 no.3
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    • pp.86-93
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    • 2020
  • The investment in solar and wind generation is rapidly increasing with government's renewable expansion policy and Renewable Portfolio Standard (RPS). Since the large penetration of solar and wind generation increases the variability and uncertainty of supply and demand balance in power system, the government is pursuing the policy of supplying energy storage system (ESS) linked to renewable energy. ESS contributes to the ease of transmission and distribution grid by shifting PV generation from daytime to evening hours. Recently, the declining market price of REC as ESS incentive, policies to cut down incentives and limited ESS storage due to fire events lead to the aggravation of long-term profitability, thus working as a barrier of ESS spreading. In this study, the factors affecting the profit of ESS are analyzed and brief indicators are derived. Based on the indicators, the profit changes are analyzed considering the variation of REC market price and REC incentive weights. Based on the profit change with respect to the increase of ESS capacity, economical ESS installation capacity is suggested.

PV Inverter Operation according to DC Capacitor Aging (직류 커패시터 노후화에 따른 PV 인버터 동작)

  • Yongho Yoon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.23 no.2
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    • pp.149-155
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    • 2023
  • Photovoltaic power generation is the most familiar power generation facility among new and renewable energies, and its supply began to expand about 10 years ago, and at this point, interest in solutions and technologies for system maintenance management is increasing. In particular, it is necessary to take measures to maximize the overall efficiency of the solar power generation system, whether or not there is an abnormality in the solar power generation system, and when to replace parts. The PV inverter, one element of the photovoltaic power generation system, is a power conversion system that relies on power switching devices, and DC-Link capacitors are used according to the configuration of DC/DC converters and DC-AC inverters. These DC capacitors also affect system safety (Safety) through renewable energy facilities due to the decrease in power generation of PV inverters, power loss, and increase in harmonics (THD, total distortion of AC output current) due to aging and deterioration due to long-term use. factors can be analyzed. Therefore, in this paper, the PV inverter operating characteristics according to the DC capacitor capacity state currently operating in the photovoltaic power generation system were considered, and research contents were proposed to secure the safety and reliability of renewable energy facilities.

Design of the Current and Speed Controller for the IPMSM based High Speed Railway Traction System (IPMSM이 적용된 차세대 고속철도 견인시스템의 전류 및 속도 제어기 설계)

  • Yi, Du-Hee;Jin, Kang-Hwan;Kwon, Soon-Hwan;Kim, Sung-Je;Kim, Yoon-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.8
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    • pp.70-77
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    • 2010
  • This paper presents the current and speed controller design procedure and their performance for the IPMSM based next generation high speed railway traction system. The next generation high speed railway system is a power distributed type and uses vector control method for a motor speed control. Since the speed and current controller gains of the vector control system directly affects to the transient characteristics and speed control capability, the systematic design of the controllers are required. In this paper the controllers are designed using the IPMSM based next generation high speed railway system parameters. Simulation programs based on Matlab/Simulink is developed. Finally the controller characteristics are analyzed by the simulation results.

Formation of Oxidants and Removal of Dye Rhodamine B using PbO2 Electrode (PbO2 전극을 이용한 산화제 생성과 염료 Rhodaime B 제거)

  • Park, Young-Seek
    • Journal of Korean Society on Water Environment
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    • v.27 no.2
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    • pp.194-199
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    • 2011
  • This study has been carried out to evaluate the performance of $PbO_2$ electrode for the purpose of degradation of N,N-Dimethyl-4-nitrosoaniline (RNO, indicator of OH radical), generation of ozone and decolorization of Rhodamine B (RhB) in water. The effect of the applied current (0.2~1.2 A), electrolyte type (NaCl, KCl and $Na_2SO_4$), electrolyte concentration (0.0~2.5 g/L) and solution pH (3~11) were evaluated. Experimental results showed that RhB and RNO removal were increased with the increase of current, NaCl dosage and decrease of pH. Ozone generation tendencies appeared with the almost similar to the RhB and RNO degradation, except of solution pH (Ozone generation was increased with increase of pH). Optimum current for RhB degradation and consumption of electric power was 1.0 A. The RhB degradation with Cl type electrolyte were higher than that with the sulfate type. Optimum NaCl dosage for RhB degradation was 1.0 g/L.

A study on the power factor improvement of Wind Turbine Generation System at Haeng-Won in Jeju (제주 행원 풍력 발전 시스템의 역률 개선에 관한 연구)

  • Park S.G.;Kim J.W.;Kang G.B.;Kim E.H.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.375-378
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    • 2003
  • This paper presents a study on the power factor improvement of the Wind turbine Generation System(WTGS) at Haeng-won wind farm in Jeju Island. Vestas WTGS named V47 as a model system is selected in this paper, and has 660 kW Power ratings. In this system, power factor correction is controlled by the conventional method with power condenor bank. So, model system at Haeng-won wind farm has very low power factor in the area of low wind speed, which is from 4 m/s to 6 m/s. This is caused by the power factor correction using power condenser bank To improve the power factor in the area of low wind speed, we used the static var compensator(SVC) using current controlled PWM power converter by IGBT switching device. finally, to verify the profosed method, the results of computer simulation using Psim program are presented to support the discussion.

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A Study on Power System Characteristics and Economic Benefit by Operating the New SIHWA Tidal Power Plant (시화호 조력발전소 신설에 따른 전력계통 특성 및 경제적 이득 분석)

  • Kim, Kyu-Ho;Song, Kyung-Bin;Kim, Sang-Min;Lee, Mu-Sung;Choi, Hong-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.6
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    • pp.791-796
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    • 2012
  • This paper presents the various analysis of the power system for operating the new SIHWA tidal power plant. In the analysis of the power system, summer load condition of 2011 is used. Especially, power flow, fault current, voltage and contingency of SIHWA tidal power plant area are analyzed by using PSS/E and there is no problem for the dynamic stability simulation. The new SIHWA tidal power plant is located in near metropolitan area where about 43% amount of the system load is consumed. Therefore, transmission losses are reduced. In addition, system marginal price can be lowered by generating the new SIHWA tidal power plant. The generation pattern of the SIHWA tidal plant is analyzed and the changes of generation are presented for various water levels by control of the rotor angle alpha and beta in water wheel generator.