• Title/Summary/Keyword: inverter control system

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Laboratory Test on Total Flow Control for Ice Slurry System with Inverter Fed Motor Pump (인버터구동 모터펌프를 이용한 아이스 슬러리형 빙축열시스템 전유량제어 운전시험)

  • Choi, Byoung-Youn;Lee, Kyoung-Ho;Lee, Sang-Ryoul;Lee, Hak-Joo
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.260-265
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    • 2001
  • This paper describes total flow control of an ice slurry system for pump energy saving. Similar turbo machinery has a characteristic that input power ratio is proportional to the three time of revolution speed ratio. To reduce the energy cost of brine pump in ice slurry storage systems, inverter is adapted instead of 3-way valve to control the speed of brine pump motor. One type of cooling load profile was used as driving load of the system, generated by a boiler and warm water storage tank. As results of the laboratory test, energy consumption and cost of the pump were reduced by 11.4%.

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Modeling of a novel power control scheme for Photovoltaic solar system

  • Park, Sung-Joon
    • Journal of information and communication convergence engineering
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    • v.6 no.4
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    • pp.417-420
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    • 2008
  • Solar electric systems have very little impact on environment, making them one of the cleanest power-generating technologies available. While they are operating, PV systems produce no air pollution, hazardous waste, or noise, and they require no transportable fuels. In PV system design, the selection and proper installation of appropriately-sized components directly affect system reliability, lifetime, and initial cost. In this research, we have studied the PWM(Pulse Width Modulation) signals. I proposed an efficient photovoltaic power interface circuit incorporated with a DC-DC converter and a sine-pwm control method full-bridge inverter. In grid-connected solar power systems, the DC-DC converter operates at high switching frequency to make the output current a sine wave, whereas the full-bridge inverter operates at low switching frequency which is determined by the ac frequency. Thus, it can reduce the switching losses incurred by the full-bridge inverter. Full-bridge converter is controlled by using microprocessor control method, and its operation is verified through computer aided simulations.

Primary Current Generation for a Contactless Power Transfer System Using Free Oscillation and Energy Injection Control

  • Li, Hao Leo;Hu, Aiguo Patrick;Covic, Grant Anthony
    • Journal of Power Electronics
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    • v.11 no.3
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    • pp.256-263
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    • 2011
  • This paper utilizes free oscillation and energy injection principles to generate and control the high frequency current in the primary track of a contactless power transfer system. Here the primary power inverter maintains natural resonance while ensuring near constant current magnitude in the primary track as required for multiple independent loads. Such energy injection controllers exhibit low switching frequency and achieve ZCS (Zero Current Switching) by detecting the high frequency current, thus the switching stress, power losses and EMI of the inverter are low. An example full bridge topology is investigated for a contactless power transfer system with multiple pickups. Theoretical analysis, simulation and experimental results show that the proposed system has a fast and smooth start-up transient response. The output track current is fully controllable with a sufficiently good waveform for contactless power transfer applications.

A Inertia Load Test of IGBT Inverter for Urban Rail Traction (도시철도차량용 IGBT 인버터 관성부하시험)

  • 김길동;박현준;한영재;이우동;변윤섭
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.118-121
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    • 1999
  • In this pager, we studies IGBT VVVF inverter for 1C4M propulsion system of railway traction. This inverter is consisted in inverter stack, DB unit, and control unit. To prove performance of inverter carry out combine test. This test verifies that performance of inverter is excellent.

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A Switching Technique for Common Mode Voltage Reduction of PWM-Inverter System using the DSP320F240 (DSP320F240을 이용한 PWM-Inverter구동 시스템에서의 전도노이즈 저감을 위한 스위칭 기법)

  • Park Hyun Seok;Park Kyu Hyun;Kim Lee Hun;Han Sung Yong;Won Chung Yuen;Kim Young Real
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.355-359
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    • 2002
  • Much attention has been given to EMI effects created in variable speed ac drive system. Zero switching states of inverter control invoke large common mode voltage. This paper focuses on the switching techniques to mitigate common mode voltage. This paper proposes a common-mode voltage reduction method based on sinusoidal pulse width modulation in three phase PWM inverter system. By using three carriers wave displaced by 120 degrees, it is possible to eliminate a common mode voltage pulse In one control period. Simulation and experimental results show that common mode voltages In the proposed technique are reduced more than conventional technique.

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Elimination of a Common Mode Voltage Pulse in Converter/Inverter System Modifying Space-Vector PWM Method (공간전압벡터 PWM을 이용한 컨버터/인버터 시스템에서의 커먼 모드 전압 펄스 제거)

  • Lee, Hyeon-Dong;Lee, Yeong-Min;Seol, Seung-Gi
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.2
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    • pp.89-96
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    • 1999
  • This paper proposes a common-mode voltage reduction method base on SVPWM(Space-Vector Pulsewidth Modulation) in three phase PWM converter/inverter system. By shifting the active voltage vector of inverter and aligning this to the active vector of converter, it is possible to eliminate a common-mode voltage pulse in one control period. Since the proposed PWM method maintains the active voltage vector, it does not affect the control performance of PWM converter/inverter system. Without any extra hardware, overall common mode voltage dv/dt and conrresponding leakage current can be reduced to two-third of the conventional three phase symmetric SVPWM scheme.

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Power Conditioning for a Small-Scale PV System with Charge-Balancing Integrated Micro-Inverter

  • Manoharan, Mohana Sundar;Ahmed, Ashraf;Seo, Jung-Won;Park, Joung-Hu
    • Journal of Power Electronics
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    • v.15 no.5
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    • pp.1318-1328
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    • 2015
  • The photovoltaic (PV) power conditioning system for small-scale applications has gained significant interest in the past few decades. However, the standalone mode of operation has been rarely approached. This paper presents a two-stage multi-level micro-inverter topology that considers the different operation modes. A multi-output flyback converter provides both the DC-Link voltage balancing for the multi-level inverter side and maximum power point tracking control in grid connection mode in the PV stage. A modified H-bridge multi-level inverter topology is included for the AC output stage. The multi-level inverter lowers the total harmonic distortion and overall ratings of the power semiconductor switches. The proposed micro-inverter topology can help to decrease the size and cost of the PV system. Transient analysis and controller design of this micro-inverter have been proposed for stand-alone and grid-connected modes. Finally, the system performance was verified using a 120 W hardware prototype.

Development of electric Four Wheel Drive System (e-4WD 시스템 개발)

  • Jo, Hee Young
    • Journal of Drive and Control
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    • v.13 no.1
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    • pp.10-17
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    • 2016
  • e-4WD(Electric-4WD) system is a 4WD(4-Wheel Drive) System that can transform a car into a Hybrid System. e-4WD consists of a Motor, Inverter, Speed reducer and Clutch. The Motor, Speed reducer and Clutch are installed on the rear sub-frame as a chassis module type. The inverter is installed separately. Compared to a mechanical 4WD, the e-4WD system has many advantages. For example, the reduced number of drivetrain components makes better use of the space. Driving with a motor only at low speed improves fuel economy and reduces exhaust gas. Engine downsizing is available because the motor assists the engine. The performance of a conventional HEV(Hybrid Electric Vehicle) system can also be maintained. This paper proposes the specifications of components and the control logic for an e-4WD System. And the effect of the e-4WD system is proven using a test vehicle equipped with components under various test conditions.

Drive Circuit of 4-Level Inverter for 42V Power System

  • Park, Yong-Won;Sul, Seung-Ki
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.11B no.3
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    • pp.112-118
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    • 2001
  • In the near future, the voltage of power system for passenger vehicle will be changed to 42V from existing 14V./ Because of increasing power and voltage ratings used in the vehicle the motor drive system has high switching dv/dt and it generates electromagnetic interference (EMI) To solve these problems multi-level inverter system may be used The feature of multi-level inverter is the output voltage to be synthesized from several levels of voltage Because of this feature high switching dv/dt and EMI can be reduced in the multi-level inverter system But as the number of level is increased manufacturing cost is getting expensive and system size is getting large. Because of these disadvantages the application of multi-level inverter has been restricted only to high power drives. The method to reduce manufacturing cost and system size is to integrate circuit of multi-level inverter into a few chips But isolated power supply and signal isolation circuit using transformer or opto-coupler for drive circuit are obstacles to implement the integrated circuit (IC) In this paper a drive circuit of 4-level inverter suitable for integration to hybrid or one chip is proposed In the proposed drive circuit DC link voltage is used directly as the power source of each gate drive circuit NPN transistors and PNP transistors are used to isolate to transfer the control signals. So the proposed drive circuit needs no transformers and opto-couplers for electrical isolation of drive circuit and is constructed only using components to be implemented on a silicon wafer With th e proposed drive circuit 4- level inverter system will be possible to be implemented through integrated circuit technology Using the proposed drive circuit 4- level inverter system is constructed and the validity and characteristics of the proposed drive circuit are proved through the experiments.

Study on T-Type Multi Level Inverter for UIPV System (계통연계형 태양광발전 시스템을 위한 T-타입 타상 인버터에 관한 연구)

  • Bayasgalan, Bayasgalan;Ryu, Ji-Su;Lee, Sang-Ho
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.313-314
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    • 2012
  • In this paper presents study of T-Type multi level inverter for utility interactive photo voltaic inverter. In order to increase efficiency and performance of utility interactive photo voltaic (UIPV) system, we propose multi level PCS topology, such as T-type inverter. The control algorithm for utility interactive inverter is implemented by simulation and experimentation, which includes dc-bus and midpoint voltage controller, ac-grid current controller and PLL algorithm.

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