• Title/Summary/Keyword: DC link inverter

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Sensorless Control of PMSM by a Four-Switch Inverter with Compensation of Voltage Distortion and Adjustment of Position Estimation Gain

  • Kim, Byeong-Han;Lee, Dong-Myung
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.100-109
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    • 2017
  • This paper proposes performance improvement schemes for sensorless PMSM control drive using a four-switch three-phase inverter (so-called B4 inverter). In the proposed scheme, the back-EMF estimation-based sensorless control algorithm is used to control the brushless PMSM without position sensors. In order to have stable operation, this paper presents a gain adjustment scheme that compensates the reduction of stable sensorless operation range as long as the rotor speed increases. In B4 topology, the center point of dc-link capacitors is connected to 3-phase load, and it is prone to have the load current distortion. Hence, to mitigate this problem, a distortion compensation scheme by modifying voltage commands using measured dc-link potentials is proposed in this paper. The validity of the proposed method is evaluated by simulations and experiments.

Three Phase Inverter System Utilizing Three Bi-directional Buck-Boost Converter (3개의 양방향 벅-부스트 컨버터를 이용한 3상 인버터 시스템)

  • Kim, Sung-Young;Nam, Kwang-Hee
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.06a
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    • pp.551-554
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    • 2006
  • An inverter system which consists of three bi-directional buck-boost converters, is proposed for motor driving. Three phase sinusoidal output voltages can be generated by utilizing three buck-boost converters. The advantage of this scheme is that it does not require a separate DC-DC converter for motor driving, i.e. inverter function is combined into the three DC-DC converters. This topology is suitable for inverters for hybrid or fuel cell vehicles where DC link voltage is subject to change depending upon charging status or output power. So the proposed system is capable of driving motor at high speed. The converter system is controlled by PI controller and simulation results done by MATLAB SIMULINK are provided.Ҙ?⨀ሉȀ̀㘰々K䍄乍?ጊ츀Ѐ㔹〻Ԁ䭃䑎䴀

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Boost-Half Bridge Single Power Stage PWM DC- DC Converters for PEM-Fuel Cell Stacks

  • Kwon, Soon-Kurl;Sayed, Khairy F.A.
    • Journal of Power Electronics
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    • v.8 no.3
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    • pp.239-247
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    • 2008
  • This paper presents the design of 1 kW prototype high frequency link boost half bridge inverter-fed DC-DC power converters with bridge voltage-doublers suitable for small scale PEM fuel cell systems and associated control schemes. The operation principle of this converter is described using fuel cell modeling and some operating waveforms. The switching mode equivalent circuits are based on simulation results and a detailed circuit operation analysis at soft-switching conditions.

A Novel Input and Output Harmonic Elimination Technique for the Single-Phase PV Inverter Systems with Maximum Power Point Tracking (최대출력추종 제어를 포함한 단상 태양광 인버터를 위한 새로운 입출력 고조파 제거법)

  • Amin, Saghir;Ashraf, Muhammad Noman;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.207-209
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    • 2019
  • This paper proposes a grid-tied photovoltaic (PV) system, consisting of Voltage-fed dual-active-bridge (DAB) dc-dc converter with single phase inverter. The proposed converter allows a small dc-link capacitor, so that system reliability can be improved by replacing electrolytic capacitors with film capacitors. The double line frequency free maximum power point tracking (MPPT) is also realized in the proposed converter by using Ripple Correlation method. First of all, to eliminate the double line frequency ripple which influence the reduction of DC source capacitance, control is developed. Then, a designing of Current control in DQ frame is analyzed and to fulfill the international harmonics standards such as IEEE 519 and P1547, $3^{rd}$ harmonic in the grid is directly compensated by the feedforward terms generated by the PR controller with the grid current in stationary frame to achieve desire Total Harmonic Distortion (THD). 5-kW PV converter and inverter module with a small dc-link film capacitor was built in the laboratory with the proposed control and MPPT algorithm. Experimental results are given to validate the converter performance.

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Single Phase 5-level Inverter with DC-link Switches (DC링크 스위치를 갖는 단상 5레벨 인버터)

  • Choi, Young-Tae;Sun, Ho-Dong;Park, Min-Young;Kim, Heung-Geun;Chun, Tea-Won;Nho, Eui-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.3
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    • pp.283-292
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    • 2011
  • This paper proposed a new multi-level inverter topology based on a H-bridge with two switches and two diodes connected to the DC-link. The output voltage of the proposed topology is quite closer to a sinusoidal waveform compared with a typical single phase inverter. The proposed multi-level inverter is applicable to a power conditioning system for renewable energy sources, and it can be also used as a building block of a cascaded multi-level inverter for a high voltage application. In case of conventional H-bridge type or NPC type multi-level inverter, 8 controllable switches are used to obtain a 5 level output voltage, but the proposed multi-level inverter requires only 6 controllable switches. Thus the circuit configuration is quite simple, reliable and cost-effective implementation is possible. The efficiency can be improved owing to the reduction of the switching loss. A new PWM method based on POD modulation is suggested which requires only one carrier signal. The switching sequence to make the capacitor voltage balanced is also considered. The feasibility is studied through simulation and experiment.

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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Three Phase Voltage-ed Soft Switching Inverter using Auxiliary Resonant DC Link (보조공진 DC 링크 스너버를 이용한 3상 전압형 소프트 스위칭 인버터)

  • Kim, Ju-Yong;Suh, Ki-Young;Lee, Hyun-Woo;Mun, Sang-Pil;Ryu, Jae-Yup
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.143-146
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    • 2002
  • This paper proposes a new 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-ed 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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Resonant Step-Down DC/DC Converter to Reduce Voltage Stresses of Motor Driving Inverter under 3-phase AC Utility Line Condition (3상 전원 조건의 모터 구동 인버터 내압 저감을 위한 공진 강압형 DC/DC 컨버터)

  • Kang, Kyung-Soo;Kim, Sang-Eon;Lee, Joon-Hwan;Roh, Chung-Wook
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.5
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    • pp.391-398
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    • 2014
  • This paper presents a resonant step-down DC/DC converter to reduce the voltage stresses of a 3-phase inverter module under the three-phase AC utility line condition. Under this condition, a conventional 3-phase inverter module suffers from high voltage stresses as a result of the high rectified DC link voltage; hence, a high-cost high-voltage-rating inverter module must be used. However, using the proposed converter, a low-cost low-voltage-rating inverter module may be adopted to drive the motor even under the 3-phase AC line condition. The proposed converter, which can be realized with small size inductor and low-voltage-rating semiconductor devices, operates at a high-efficiency mode because of the zero-current switching operations of all the semiconductor devices. The operational principles are explained and a design example is provided in the study. Experimental results demonstrate the validity of the proposed converter.

Fuel Cell Inverter Operation for Distributed Generation of simulation (연료전지의 인버터 운전 시뮬레이션)

  • Jeong, Dong-Hyo
    • Proceedings of the KIEE Conference
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    • 2007.11c
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    • pp.170-174
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    • 2007
  • Recently, a fuel cell is remarkable for new generation system. The fuel cell generation system converts the chemical energy of a fuel directly into electrical energy. The fuel cell generation is characterized by low voltage and high current. For connecting to utility, it needs both a step up converter and an inverter. The step up converter makes DC link and the inverter changes DC to AC. In this paper full bridge converter and the single phase inverter are designed and installed for fuel cell. Simulation and experiment verify that fuel cell generation system could be applied for the distributed generation.

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Flux Weakening Control for Surface Mounted Permanent Magnet Synchronous Machine Driven by Dual Inverter (이중 인버터를 이용한 표면 부착형 영구자석 동기전동기의 약자속 제어)

  • Kim, Youngnam;Lee, Yongjae;Ha, Jung-Ik
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.5
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    • pp.437-442
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    • 2013
  • For open-end permanent magnet synchronous machine(PMSM) with dual inverter system, where one inverter is connected to the source and the other is flying, the dc link voltage of the flying inverter can be boosted through the machine. For this reason, when compared with single inverter drive system, higher voltage can be applied to PMSM, and higher torque can be generated in the flux weakening region. In this case, however, active and reactive powers are separately supplied by each inverter to maintain the dc link voltage of flying inverter. Therefore, the required flux weakening control is different from the conventional method for a single inverter drive system. This paper proposes the novel flux weakening control method which maximizes the active voltage component in a dual inverter PMSM drive system. The proposed method was demonstrated and verified through experimental results.