The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
Jungik Ha - One of the best experts on this subject based on the ideXlab platform.
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single phase grid connected motor drive system with dc link shunt compensator and small dc link capacitor
IEEE Transactions on Power Electronics, 2017Co-Authors: Hojoon Shin, Young-ho Chae, Jungik HaAbstract:The Single-Phase Diode Rectifier system with small dc-link capacitor shows wide Diode conduction time and it improves the grid current harmonics. By shaping the output power, the system meets the grid current harmonics regulation without any power factor corrector or grid filter inductor. However, the system has torque ripple and suffers efficiency degradation due to the insufficient dc-link voltage. To solve this problem, this paper proposes the dc-link shunt compensator (DSC) for small dc-link capacitor systems. DSC is located on dc-node in parallel and operates as voltage source, improving the system performances. This circuit helps the grid current-shaping control during grid-connection time, and reduces the flux-weakening current by supplying the energy to the motor during grid-disconnection time. This paper presents a power control method and the design guideline of DSC. The feasibility of DSC is verified by simulation and experimental results.
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discontinuous grid current control of motor drive system with single phase Diode Rectifier and small dc link capacitor
IEEE Transactions on Power Electronics, 2017Co-Authors: Jungik HaAbstract:In this paper, a control method for motor drive system without electrolytic capacitor is proposed. Since dc-link capacitor of this motor drive is about 1% of the conventional one, it can satisfy the grid current regulation of IEC61000-3-2 without bulky filter circuits by directly controlling the electric output power of the inverter. However, dc-link voltage of this drive fluctuates as the rectified grid voltage. It causes higher motor current, especially at the low dc-link voltage area, and severely harms the drive efficiency. To solve this problem, proposed method keeps the dc-link voltage higher than certain limit while controlling the output power. It can improve the efficiency of the drive by lowering the d-axis current at low dc-link voltage area, with satisfying the regulation with small grid current harmonics. The proposed method includes the motor current reference generation for the limited dc-link voltage and selection of the limitation value. The improved performance of the proposed method was verified by the experimental results.
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direct power control of a three phase inverter for grid input current shaping of a single phase Diode Rectifier with a small dc link capacitor
IEEE Transactions on Power Electronics, 2015Co-Authors: Yeongrack Son, Jungik HaAbstract:This paper describes motor drive system fed by a Single-Phase Diode Rectifier without power factor correction (PFC) circuit or the input filter. The system considered in this paper consists of a Single-Phase Diode Rectifier, a three-phase inverter, and a small dc-link capacitor. Since dc-link capacitance of the proposed system is few microfarads, the shape of the grid input current is directly affected by electrical output power of the inverter. Using this aspect, two goals of the drive system, controlling torque of the motor and suppressing the grid input current harmonics, can be simultaneously achieved by controlling the output power of the inverter. The proposed method includes the motor current reference generation and the direct output power regulation by modifying the output voltage reference. With the proposed method, the harmonic components of the grid input current can be reduced under the limits of the regulation IEC61000-3-2, lower than those in the conventional method. Also, the cost and size of the inverter system can be significantly reduced by removing electrolytic dc-link capacitor and input filter from the system. The performance of the proposed shaping method was validated by the experimental results using the motor drive system with a 5μF film capacitor at dc link.
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Partial power assistance operation for Single-Phase grid-fed motor drive system with DC-link shunt compensator
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Hojoon Shin, Young-ho Chae, Hyeon-gyu Choi, Jungik HaAbstract:This paper proposes a partial power assistance operation to encourage the feasibility of a Single-Phase Diode Rectifier-fed motor drive system equipping DC-link shunt compensator (DSC). DSC which is located to DC-link in parallel allows to remove electrolytic capacitor and grid filter inductor from the system by performing grid current shaping and motor output power supporting controls. The capability of DSC is mainly determined by the required energy during grid disconnection time where DSC should fully supply motor output power. If motor drive system needs full-rated power in overall area, DSC should possess supply ability and becomes heavy and bulky. Moreover, since available DC-link voltage is relatively low during this area, total system efficiency is decreased. Therefore this paper proposes partial power assistance operating method for DSC system which can ease the burden of DSC. This method uses ripple power control in order to actively utilize the fluctuating DC-link voltage which is unique characteristic of the DSC system, so it is able to be applied ripple allowable applications. However the DSC system with proposed method has advantage for improving system efficiency and being able to miniaturize the DSC.
Ahmet M. Hava - One of the best experts on this subject based on the ideXlab platform.
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Performance Enhancement of the Single-Phase Series Active Filter by Employing the Load Voltage Waveform Reconstruction and Line Current Sampling Delay Reduction Methods
IEEE Transactions on Power Electronics, 2011Co-Authors: Ozan Sanlı Şentürk, Ahmet M. HavaAbstract:This paper proposes the waveform reconstruction method (WRM), which is utilized in the Single-Phase series active filter's (SAF's) control algorithm, in order to extract the load harmonic voltage component of voltage harmonic type Single-Phase Diode Rectifier loads. Employing WRM and the line current sampling delay reduction method, a Single-Phase SAF compensated system provides higher harmonic isolation performance and higher stability margins compared to the system using conventional synchronous-reference-frame-based methods. The analytical, simulation, and experimental studies of a 2.5 kW Single-Phase SAF compensated system prove the theory.
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High performance harmonic isolation by means of the Single-Phase series active filter employing the Waveform Reconstruction Method
2009 IEEE Energy Conversion Congress and Exposition ECCE 2009, 2009Co-Authors: Ozan Sanlı Şentürk, Ahmet M. HavaAbstract:This paper proposes the waveform reconstruction method (wrm), which is utilized in the Single-Phase series active filter's (SAF's) control algorithm, in order to extract the load harmonic voltage component of voltage harmonic type Single-Phase Diode Rectifier loads. Employing WRM and the line current sampling delay reduction method (SDRM), a Single-Phase SAF compensated system provides higher harmonic isolation performance and higher stability margins compared to the system using conventional synchronous reference frame based methods. The analytical, simulation, and experimental studies of a 2.5 kW Single-Phase SAF compensated system prove the theory.
Hitoshi Haga - One of the best experts on this subject based on the ideXlab platform.
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high power factor single phase Diode Rectifier driven by repetitively controlled ipm motor
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Kazuya Inazuma, H Utsugi, Kiyoshi Ohishi, Hitoshi HagaAbstract:This paper proposes a new power factor correction method using an inverter-driven interior permanent magnet (IPM) motor. The proposed system realizes the high power factor of a Single-Phase Diode Rectifier by using a three-phase pulsewidth modulation inverter and an IPM motor. The proposed converter consists of a Single-Phase Diode Rectifier, a small film capacitor at the dc link (14 μF and 0.33 J/kVA), a three-phase voltage-source inverter, and an IPM motor. In the proposed system, the inverter has the following two functions: 1) It regulates the velocity of the IPM motor, and 2) it controls the source-side-current waveform. In order to obtain a unity-power-factor operation at the source side, we propose and implement a new control method that regulates the inverter output power. The proposed control method is that the inverter regulates d-q-axis current synchronous with input voltage. An inverter-output-power controller is positioned between a speed controller and a q-axis current controller. The inverter output power is regulated by a proportional-integral and repetitive controller. The maximum power factor obtained by the proposed method is 98.7% at the rated-load conditions. The superior performance of the proposed system is demonstrated by experimental results.
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high power factor control for inverter output power of ipm motor driven by inverter system without electrolytic capacitor
International Symposium on Industrial Electronics, 2011Co-Authors: Kazuya Inazuma, Kiyoshi Ohishi, Hitoshi HagaAbstract:This paper proposes a new high-power-factor control method applicable for a Single-Phase to three-phase power converter without an electrolytic capacitor. This converter consists of a Single-Phase Diode Rectifier, a small film capacitor at the DC-link, a voltage source three-phase inverter, and an interior permanent magnet (IPM) synchronous motor. In this system, the inverter regulates both the velocity of the IPM motor and the input-current waveform. In order to obtain a unity power factor, this paper proposes a new control method that regulates the inverter output power. An inverter output-power controller is placed between a speed controller and a q-axis current controller. The inverter power is regulated by a PI controller. The superior performance of the proposed method is demonstrated experimentally.
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Power factor improvement of single‐phase Diode Rectifier circuit by field‐weakening of inverter‐driven IPM motor
Electrical Engineering in Japan, 2005Co-Authors: Isao Takahashi, Hitoshi HagaAbstract:This paper proposes a novel inverter drive system to improve the input power factor of Single-Phase Diode Rectifier. Conventional Rectifiers need a high-frequency switching device and a reactor to improve the input power factor. However, the proposed power converter does not need the switching device, electrolytic capacitor, or reactor. By making many ripples across the DC-bus voltage, the input power factor can be improved. The proposed system consists of only a Single-Phase Diode Rectifier, small film capacitor, three-phase inverter, and motor. The proposed system adopts an interior permanent magnet (IPM) synchronous motor. The IPM motor is well known as a high-efficiency motor and can realize field weakening. The basic ideas of the inverter control method are based on the following operations: the inverter's controlled synchronous with the DC-bus ripple voltage by field-weakening method, and direct active power feeding from the source side to the motor without smoothing the DC-bus voltage. This paper describes that the proposed method can obtain an input power factor of 97.3% by experimental tests, and realizes the goals of small size and long life of the system. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 66–73, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20047
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IPM Motor Drive Method Using a New Inverter Having the Operation of High Power Factor Single-Phase Diode Rectifier without Electrolytic Capacitor
IEEJ Transactions on Industry Applications, 2004Co-Authors: Hitoshi Haga, Isao Takahashi, Kiyoshi OhishiAbstract:This paper proposes a new inverter drive system for an interior permanent magnet (IPM) synchronous motor and an inverter control strategy to obtain the unity power factor operation of the Single-Phase Diode Rectifier. The motor drive system for home appliances requires improving the input power factor without a reactor, an electrolytic capacitor and a switching device. This paper can achieve to improve the input power factor without a reactor, a current control-switching converter and an electrolytic capacitor. The proposed system consists of only Single-Phase Diode Rectifier, small film capacitor (10uF/kW) across the dc-bus, three-phase inverter and IPM motor. Source side energy provides directly to the motor without smoothing the dc-bus voltage. There are many ripple voltages across the dc-bus. A principle of unity-power-factor operation is that the inverter makes the waveform of input current sinusoidal. The unity power factor operation is achieved by dither effect. For IPM motor, the inverter control scheme in this paper is based on direct torque control (DTC). The proposed system is constructed by the input current controller based on DTC. The additional current controller improves its input current waveform. This paper describes that the proposed method achieves the power factor 98.8% by experimental tests.
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Inverter control method of IPM motor to improve power factor of Diode Rectifier
Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2002Co-Authors: Isao Takahashi, Hitoshi HagaAbstract:This paper proposes a novel control strategy to improve input power factor of the single phase Diode Rectifier. The proposed power converter doesn't need energy storage units such as an electrolytic capacitor or a reactor. So there are many ripples across the DC-bus voltage and then, the input power factor can be improved. The proposed system consists of an only Diode Rectifier, a small film DC capacitor, a three phase inverter and an interior permanent magnet (IPM) synchronous motor. The basic ideas are based on two following operations. First, the inverter's controlled synchronous with the DC-bus ripple voltage by field-weakening method. The other is direct active power control from the source to the motor without smoothing the DC-bus voltage. This paper shows that the proposed method can obtain the input power factor over 97% by experimental tests, and realize the small size and the long life of the system.
Yeongrack Son - One of the best experts on this subject based on the ideXlab platform.
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Discontinuous Grid Current Control of Motor Drive System With Single-Phase Diode Rectifier and Small DC-Link Capacitor
IEEE Transactions on Power Electronics, 2017Co-Authors: Yeongrack SonAbstract:In this paper, a control method for motor drive system without electrolytic capacitor is proposed. Since dc-link capacitor of this motor drive is about 1% of the conventional one, it can satisfy the grid current regulation of IEC61000-3-2 without bulky filter circuits by directly controlling the electric output power of the inverter. However, dc-link voltage of this drive fluctuates as the rectified grid voltage. It causes higher motor current, especially at the low dc-link voltage area, and severely harms the drive efficiency. To solve this problem, proposed method keeps the dc-link voltage higher than certain limit while controlling the output power. It can improve the efficiency of the drive by lowering the d-axis current at low dc-link voltage area, with satisfying the regulation with small grid current harmonics. The proposed method includes the motor current reference generation for the limited dc-link voltage and selection of the limitation value. The improved performance of the proposed method was verified by the experimental results.
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direct power control of a three phase inverter for grid input current shaping of a single phase Diode Rectifier with a small dc link capacitor
IEEE Transactions on Power Electronics, 2015Co-Authors: Yeongrack Son, Jungik HaAbstract:This paper describes motor drive system fed by a Single-Phase Diode Rectifier without power factor correction (PFC) circuit or the input filter. The system considered in this paper consists of a Single-Phase Diode Rectifier, a three-phase inverter, and a small dc-link capacitor. Since dc-link capacitance of the proposed system is few microfarads, the shape of the grid input current is directly affected by electrical output power of the inverter. Using this aspect, two goals of the drive system, controlling torque of the motor and suppressing the grid input current harmonics, can be simultaneously achieved by controlling the output power of the inverter. The proposed method includes the motor current reference generation and the direct output power regulation by modifying the output voltage reference. With the proposed method, the harmonic components of the grid input current can be reduced under the limits of the regulation IEC61000-3-2, lower than those in the conventional method. Also, the cost and size of the inverter system can be significantly reduced by removing electrolytic dc-link capacitor and input filter from the system. The performance of the proposed shaping method was validated by the experimental results using the motor drive system with a 5μF film capacitor at dc link.
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Grid current shaping of single phase Diode Rectifier with small DC-link capacitor for three phase motor drive
2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014Co-Authors: Yeongrack SonAbstract:In this paper, motor drive system fed by single phase Diode Rectifier without Power Factor Correction (PFC) circuit is proposed. The motor drive considered in this paper consists of single phase Diode Rectifier, three-phase inverter, and small DC-link capacitor. Since DC-link capacitor is small, grid input current of the Diode Rectifier can be directly affected by electrical output power of the inverter. Using this aspect, the proposed method in this paper can drive the motor and shape the grid current with low harmonics simultaneously. This paper proposes the motor current reference generation method and the direct regulation method of the inverter output power by modifying the output voltage reference. Comparative analysis of Interior Permanent Magnet Synchronous Motor (IPMSM) and Synchronous Reluctance Motor (SynRM) with proposed drive system is also included. With the proposed controller, the harmonic components of the grid current can be suppressed below the limits stated in the regulation IEC61000-3-2. Also, cost and size of the inverter system can be significantly reduced by removing electrolytic capacitor and PFC circuit from the system. The improved performance of the proposed method was verified by the experimental results using the inverter system with a 5μF DC-link capacitor.
Young-ho Chae - One of the best experts on this subject based on the ideXlab platform.
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single phase grid connected motor drive system with dc link shunt compensator and small dc link capacitor
IEEE Transactions on Power Electronics, 2017Co-Authors: Hojoon Shin, Young-ho Chae, Jungik HaAbstract:The Single-Phase Diode Rectifier system with small dc-link capacitor shows wide Diode conduction time and it improves the grid current harmonics. By shaping the output power, the system meets the grid current harmonics regulation without any power factor corrector or grid filter inductor. However, the system has torque ripple and suffers efficiency degradation due to the insufficient dc-link voltage. To solve this problem, this paper proposes the dc-link shunt compensator (DSC) for small dc-link capacitor systems. DSC is located on dc-node in parallel and operates as voltage source, improving the system performances. This circuit helps the grid current-shaping control during grid-connection time, and reduces the flux-weakening current by supplying the energy to the motor during grid-disconnection time. This paper presents a power control method and the design guideline of DSC. The feasibility of DSC is verified by simulation and experimental results.
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Motor current reference generation for reducing motor currents in drive systems with Single-Phase Diode Rectifier and small dc-link capacitor
2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016Co-Authors: Young-ho ChaeAbstract:In this paper, new method for generating motor current references is proposed in motor drive systems with Single-Phase Diode Rectifier and small dc-link capacitor in order to reduce the amount of the motor currents. Unlike the conventional large dc-link capacitor, small dc-link capacitor cannot work as an energy buffer. Therefore the motor currents, d and q-axis currents in synchronous reference frame, as well as output power are pulsating. The previous studies for generating motor current references in small dc-link capacitor systems did not consider the derivation terms of current in voltage equation. This paper presents new motor current reference generation algorithm considering the derivation terms so that the current can be saved where the dc-link voltage is enough and on-line calculation of current references can be possible. With the proposed method, the level of the motor current is reduced compared to the previous one and the efficiency of the system increases consequently. The effectiveness of the proposed method was verified with the simulation results.
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Partial power assistance operation for Single-Phase grid-fed motor drive system with DC-link shunt compensator
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Hojoon Shin, Young-ho Chae, Hyeon-gyu Choi, Jungik HaAbstract:This paper proposes a partial power assistance operation to encourage the feasibility of a Single-Phase Diode Rectifier-fed motor drive system equipping DC-link shunt compensator (DSC). DSC which is located to DC-link in parallel allows to remove electrolytic capacitor and grid filter inductor from the system by performing grid current shaping and motor output power supporting controls. The capability of DSC is mainly determined by the required energy during grid disconnection time where DSC should fully supply motor output power. If motor drive system needs full-rated power in overall area, DSC should possess supply ability and becomes heavy and bulky. Moreover, since available DC-link voltage is relatively low during this area, total system efficiency is decreased. Therefore this paper proposes partial power assistance operating method for DSC system which can ease the burden of DSC. This method uses ripple power control in order to actively utilize the fluctuating DC-link voltage which is unique characteristic of the DSC system, so it is able to be applied ripple allowable applications. However the DSC system with proposed method has advantage for improving system efficiency and being able to miniaturize the DSC.