• Title/Summary/Keyword: inverter and converter noise

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A Study of Maglev Train Inverter and Converter Noise (자기부상열차용 인버터 및 컨버터 소음에 관한 연구)

  • Kim, Hyun-Sil;Kim, Jae-Seung;Kang, Hyun-Joo;Kim, Bong-Ki;Kim, Sang-Rul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.346-351
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    • 2002
  • Noise of the VVVF inverter and DC/DC converter, which are the most dominant noise sources of maglev train at low speed, is studied, The coils inside inverter and converter are excited by electro-magnetic forces, which results in core vibration and generations of the noise. It is found that the spectra of the noise show many harmonics, where there exist several different fundamental frequencies. Some noise reducing techniques are known for the transformer noise such as changing stiffness and using different core materials, which make less electrostatic responses, and consequently less noise. In this study, it is shown that the most effective and feasible noise reducing method is to increase the switching frequencies of the inverter and converter, where peaks in higher frequency are significantly reduced.

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A Study of Maglev Train Inverter and Conveter Noise (자기부상열차용 인버터 및 컨버터 소음에 관한 연구)

  • Kim, Hyun-Sil;Kim, Jae-Seung;Kang, Hyun-Joo;Kim, Bong-Ki;Kim, Sang-Rul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.339.1-339
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    • 2002
  • Noise of the VVVF inverter and DC/DC converter, which are the most dominant noise sources of maglev train at low speed, is studied. The coils inside inverter and converter are excited by the electro-magnetic forces, which results in core vibration and generations of the noise. It is found that the spectra of the noise show many harmonics, where there exist several different fundamental frequencies. (omitted)

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Noise Analyses of VVVF Inverter and DC/DC Converter for Maglev Train (자기부상열차용 VVVF 인버터 및 DC/DC 컨버터의 소음해석)

  • 김현실;김재승;강현주;김봉기;김상렬
    • The Journal of the Acoustical Society of Korea
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    • v.22 no.5
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    • pp.337-344
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    • 2003
  • In DC/DC converter and VVVF inverter, which are the must dominant noise sources of Maglev train, noise is radiated from core and coil excited by MS(Magnetostriction). The main noise source of DC/DC converter is transformer whose spectrum shows strong peaks associated with harmonics of exciting frequency, On the other hand, LIM/VVVF noise is dominated by the harmonics of switching frequency, whereas harmonics of exciting frequency are not significant. As switching frequency is increased in VVVF inverter, it is shown that the harmonics are shifted to higher frequency range. If switching frequency is increased from 700㎐ to 2 ㎑, It is measured that noise can be reduced by 5 to 6 ㏈. Since complete mathematical description of MS phenomena is far beyond the present technology, vibration spectrum is investigated qualitatively in this paper, where effect of increasing switching frequency is confirmed.

A Study on the Power Loss Simulation of Inverter and Converter for Elevator (승강기용 전력변환장치의 IGBT 전력손실에 관한 연구)

  • Cho, Su-Eog
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.12
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    • pp.116-123
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    • 2014
  • In case of power electronics, th power loss and EMI noise of IGBT is different depends on a adopting technology with the same power rating. To reduce the EMI noise, we could increase the resistance of gate. But in this case, the power loss of IGBT is increased, In this paper, we simulated the power loss of IGBT with the speed profile of elevator by the changing IGBT type, the voltage between gate and emitter, the resistance of gate in converter and inverter for elevator. To optimize the power electronics with the satisfied life time, It is necessary that we calculate the power loss and the rise of temperature in IGBT with the adopting technology type, the resistence of gate, the voltage between gate and emitter.

Advanced PWM Method for Reducing Common-Mode Noise in Converter/Inverter System (컨버터/인버터 시스템의 커먼 모드 노이즈 억제를 고려한 PWM 기법)

  • Lee, Young-Min;Lee, Hyeoun-Dong;Sul, Seung-Ki
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.1882-1885
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    • 1998
  • This paper proposes the advanced PWM method which can reduce common-mode voltage in 3 phase PWM converter/inverter system. By shifting the zero voltage vector of inverter in a sampling period, it is possible to cancel out a common-mode voltage pulse defined by switching functions of converter and inverter. Without any loss of control performance of converter/inverter system, overall common-mode voltage can be reduced by one-third compared with that of conventional PWM scheme.

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A Inverter Design of Reversible Power Converter (가역 전력변환기의 인버터 설계)

  • Chun, J.H.;Lee, H.W.;Baek, S.H.;Kwak, D.K.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2005.05a
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    • pp.8-13
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    • 2005
  • In this paper discusses single-phase DC-AC Inverter design of reversible power converter that driven by binary combination at different transformer winding ratio by BCD code level. It has a advantage that constructs a control system simply and obtain load current of good quality without filter circuit and free from noise or isolation for lower switching frequency. In this research, study on current type converter and inverter circuit that consist for possibility of AC-DC/DC-AC multi-level reversible converter.

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Digital Control of Utility-Connected PV Inverter (계통 연계형 태양광 발전 인버터의 디지털 제어)

  • Kim Yong-Kyun;Chol Jong-Woo;Kim Heung-Geun
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1161-1165
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    • 2004
  • The fundamental digital control of utility-connected PV inverter are presented with detailed analysis and simulation and experimental results. PLL controller using virtual two phase detector, current controller of DC-DC converter, dc link voltage controller and inverter current controller are discussed. The novel PLL controller using virtual two phase detector can detect the information of utility voltage instantaneously and is not sensitive to the noise. Current controller of DC-DC converter, dc link voltage controller and inverter current controller are the conventional methods. We have constructed utility-Connected PV Inverter and applied to those controllers. The simulation and experimental results demonstrate an excellent performance in the single-phase grid-connected operation.

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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.

Technological overview of the main converter/inverter between HEMU-400X and abroad High Speed Trains (HEMU-400X와 해외 주전력 변환장치 시스템기술 분석)

  • So, Jin-Sub;Lee, Young-Yeob;Lee, Jin-Houng;Son, Kyoung-So;Lee, Jong-Ho;Kook, Moon-Seok;Yun, Cha-Jung
    • Proceedings of the KSR Conference
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    • 2009.05b
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    • pp.567-573
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    • 2009
  • The technologies of the main converter/inverter, which is indispensable for securing a safety and reliability of traction performance in rolling stock, have been compared and analyzed between HEMU-400X and High Speed Trains in Japan, France and Germany through this study. The result of this study indicates that home and abroad technologies aim at a small-sized and lightweight main converter/inverter as well as the prevention of noise in electric ventilator.

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Two-Switch Auxiliary Resonant DC Link Snubber-Assisted Three-Phase Soft Switching PWM Sinewave Power Conversion System with Minimized Commutation Power Losses

  • Nagai, Shinichiro;Sato, Shinji;Ahmed, Tarek;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.3 no.4
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    • pp.249-258
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    • 2003
  • This paper presents a high-efficient and cost effective three-phase AC/DC-DC/AC power conversion system with a single two-switch type active Auxiliary Resonant DC Link (ARDCL) snubber circuit, which can minimize the total power dissipation. The active ARDCL snubber circuit is proposed in this paper and its unique features are described. Its operation principle in steady-state is discussed for the three phase AC/DC-DC/AC converter, which is composed of PWM rectifier as power factor correction (PFC) converter, sinewave PWM inverter. In the presented power converter system not only three-phase AC/DC PWM rectifier but also three-phase DC/AC inverter can achieve the stable ZVS commutation for all the power semiconductor devices. It is proved that the proposed three-phase AC/DC-DC/AC converter system is more effective and acceptable than the previous from the cost viewpoint and high efficient consideration. In addition, the proposed two-switch type active auxiliary ARDCL snubber circuit can reduce the peak value of the resonant inductor injection current in order to maximize total system actual efficiency by using the improved DSP based control scheme. Moreover the proposed active auxiliary two-switch ARDCL snubber circuit has the merit so that there is no need to use any sensing devices to detect the voltage and current in the ARDCL sunbber circuit for realizing soft-switching operation. This three-phase AC/DC-DC/AC converter system developed for UPS can achieve the 1.8% higher efficiency and 20dB lower conduction noise than those of the conventional three-phase hard-switching PWM AC/DC-DC/AC converter system. It is proved that actual efficiency of the proposed three-phase AC/DC-DC/AC converter system operating under a condition of soft switching is 88.7% under 10kw output power.