• Title/Summary/Keyword: DC-link voltage variation

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A Performance Improvement Method of PMSM Torque Control Considering DC-link Voltage Variation (DC-link 전압변동을 고려한 PMSM 토크제어의 성능 향상 방법)

  • Lee, Jung-Hyo;Won, Chung-Yuen
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.11
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    • pp.112-122
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    • 2014
  • This paper proposes a PMSM torque control method considering DC-link voltage variation and friction torque. In general EV/HEV application, two dimensions look-up table(2D-LUT) is used for reference current generation due to its stable and robust torque control performance. Conventionally, this 2D-LUT is established by flux-torque table to overcome the DC-link voltage variation. However, the flux table establishment is more complex than the speed table establishment. Moreover, one flux data reflects several speed conditions in variable DC-link voltage, friction torque cannot be considered by using the flux table. In this paper, speed-torque 2D-LUT is used for current reference generation. With this table, PMSM torque control is well achieved regardless of DC-link voltage variation by the proposed control method. Simulation and experimental results validate improvement of torque control error through friction torque compensation.

Motor Control Method for Four-Switch Inverters with DC-link Voltage Ripple Compensation Algorithm (Four-Switch 인버터의 전압 변동 보상 기법을 통한 전동기 운전 기법)

  • Lee, Dong-Myung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.7
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    • pp.59-66
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    • 2013
  • This paper proposes a new voltage reference generation method for Four-Switch Inverters(FSI) with compensation of the neutral DC-link voltage variation. Since FSIs have the split DC-link causing the inherent problem of voltage fluctuations in the upper and lower capacitors, it is required to take account the voltage difference between the top and bottom capacitors. In this paper, to reduce the effect by the voltage variation, reference voltages are modified by adding compensation voltages proportional to the voltage difference between upper and lower capacitors. Simulation results showing control performance of induction and permanent magnet motors demonstrate the validity of the proposed method.

DC-link Voltage Ripple Compensation Method for Single Phase 3-level PWM Converters (단상 3-레벨 PWM 컨버터를 위한 중성점 전압 변동 보상 기법)

  • Lee, Hee-Myun;Lee, Dong-Myung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.4
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    • pp.8-15
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    • 2013
  • This paper proposes a DC-link voltage variation compensation method for a 3-level single phase converter for high-speed trains. Since 3-level NPC(Neutral Point Clamped) type converters have the split DC-link causing the inherent problem of voltage fluctuations in the upper and lower capacitors, reducing the voltage difference between the top and bottom capacitors is required. In this paper, compensation time proportional to the voltage difference is added to PWM switching time to solve the voltage variation. The compensation time is obtained by a PI controller. Simulation results demonstrate the validity of the proposed method.

Instantaneous Control of a Single-phase PWM Converter Considering the Voltage Ripple Estimate (전압 리플 추정을 고려한 단상 PWM 컨버터의 순시치 제어)

  • 김만기;이우철;현동석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.2
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    • pp.29-34
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    • 1997
  • In this paper, instantaneous controller of a single-phase PWM converter is realized using DSP. The stable PI gain of the input current and the DC link voltage control system is designed. The DC link voltage control system can be designed in continuous- time domain. But as for the input current control system, the descretizing effect cannot be ignored so it must be designed in descrete-time domain considering the calculation time. The capacitance estimating algorithm which can be acquired through the ripple voltage is proposed. By this algorithm the DC link capacitance can be estimated even under the transient state. Experimental results show the input power factor of 99.1% and the voltage variation rate of $\pm$5% according to the load variation.

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An Optimal Damping Control Algorithm of Direct Two-level Inverter for Miniaturization and Weight Reduction of Auxiliary Power Supply on Railway Vehicle

  • Lee, Chang-hee;Lee, Ju
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2335-2343
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    • 2018
  • This paper proposes an optimal damping control algorithm of the DTI (Direct Two-level Inverter) to miniaturize and reduce the weight of auxiliary power supply for railway vehicles. The conventional auxiliary power supply for railway vehicles uses a DC-DC converter to maintain the inverter input power from the line voltage smoothly. The proposed topology does not use a DC-DC converter for reducing of manufacturing and maintenance costs. It also proposes a DTI topology removed damping resistors that generate ground signal noise in a certain period. At this time, a resonance phenomenon of DC-link voltage occurs due to variation of the inductive load, and a method of controlling the resonance phenomenon of DC-link voltage is required. In order to suppress the resonance phenomenon of the DC-link voltage, at a point before resonance occurs, this paper introduces an algorithm to suppress the resonance phenomenon of DC-link voltage by compensating the resonance component of the q axis voltage of the synchronous reference frame. The proposed algorithm verifies the effect through simulation and experiment.

Phase Shift Control for Series Active Voltage Quality Regulators

  • Xiao, Guochun;Teng, Guofei;Chen, Beihai;Zhang, Jixu
    • Journal of Power Electronics
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    • v.12 no.4
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    • pp.664-676
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    • 2012
  • A phase shift algorithm based on the closed-loop control of dc-link voltage implemented on a series active voltage quality regulator (AVQR) is proposed in this paper. To avoid pumping-up the dc-link voltage, a general phase shift compensation strategy is applied. The relationships among the operation variables are discussed in detail, which is very important for guiding the design of both the main circuit and the control system. Then on the basis of an investigation of the dc-link voltage pumping-up from viewpoint of the active power flow, a novel phase shift control method based on the closed-loop of the dc-link voltage is proposed. This method can adjust the phase of the output voltage gradually and automatically according to the dc-link voltage variation without introducing a phase jump. The effectiveness of the proposed strategy is verified through simulations of a single-phase 5kVA prototype and laboratory experiments on both a single-phase 5kVA and a three-phase 15kVA prototype.

Instantaneous Control of a Single-phase PWM Converter Considering the Voltage Ripple Estimate (전압 리플 추정을 고려한 단산 PWM 컨버터의 순시치 제어)

  • 김만기;이우철;현동석
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.27-33
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    • 1997
  • In this paper, instantaneous controller of a single-phase PWM converter is realized using DSP. The stable PI gain of the input current and the DC link voltage control system is designed. The DC link voltage control system can be designed in continuous-time domain. But as for the input current control system, the descretizing effect cannot be ignored so it must be designed in descrete-time domain considering the calculation time. The capacitance estimating algorithm which can be acquired through the ripple voltage is proposed. By this algorithm the DC link capacitance can be estimated even under the transient state. Experimental results show the input power factor of 99.1% and the voltage variation rate of $\pm$5% according to the load variation.

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Minimization of DC-Link Capacitance for NPC Three-level PWM Converters

  • Alemi, Payam;Lee, Dong-Choon
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.370-371
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    • 2011
  • This paper presents a control algorithm that minimizes the DC-link capacitance by decreasing the capacitor current. The capacitor current can be nullified by a feedback compensation term which is calculated from the power balance in the AC/DC converter. As a result, voltage variation in the DC-link is reduced further, which makes a large reduction in the size of DC-link capacitors which are expensive and have limitations in life time. Simulations are performed with two 80uF DC-link capacitors, which can be replaced by film capacitors.

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Fault Diagnosis of a Electrolytic Capacitor for Inverter DC-Link Voltage Smoothing (인버터 직류링크 전압 평활용 전해 커패시터의 고장 진단)

  • Lee, Kwang-Woon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.5
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    • pp.372-377
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    • 2007
  • This paper proposes a novel fault diagnosis method of a electrolytic capacitor used for DC-link voltage smoothing in adjustable speed drives. The equivalent series resistance (ESR) of the electrolytic capacitor is directly estimated from DC-link voltage and load currents and the status of the electrolytic capacitor is determined from the estimated ESR. To compensate the variation of the ESR owing to temperature variation, diodes are located on the same PCB near the capacitor and the temperature of the capacitor is sensed indirectly from the voltage drop of diodes. Simulation and experimental studies show the effectiveness of the proposed method.

Efficiency Characteristic of PV Inverter with Variable DC-Link (가변 DC-Link 전압 제어를 이용한 태양광 인버터 효율 향상 연구)

  • Kim, Dong-Gyun;Jo, Yeong-Min;Cho, Sang-Yoon;Choy, Ick;Lee, Young-Kwoun;Choi, Ju-Yeop
    • Proceedings of the KIPE Conference
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    • 2015.11a
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    • pp.115-116
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    • 2015
  • Grid voltage variation is usually happened but existing PV inverter dose not consider this variation before inverting into AC power. This inverting is a cause of unnecessary losses. This paper proposes that DC-link should be changed for removing those losses. Furthermore, maximum efficiency tracking control algorithm with variable DC-link voltage is proposed and verified by simulation and experiment.

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