Series Active Filter

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H. Akagi - One of the best experts on this subject based on the ideXlab platform.

  • DFT-based Repetitive Control of a Series Active Filter Integrated with a 12-pulse Diode Rectifier
    2007 IEEE Power Electronics Specialists Conference, 2007
    Co-Authors: A.d. Le Roux, Hdu.t. Mouton, H. Akagi
    Abstract:

    This paper considers the transient performance and stability of a recurrent DFT-based control method for a Series Active Filter integrated with a 12-pulse diode rectifier. The control method targets specific harmonics and/or the negative sequence fundamental component of the supply current and is intended for use with non-sinusoidal/unbalanced supply voltages. The proposed control method is based on DFTs instead of the dq-method and a simple approach is used to account small frequency variations found in practical power systems.

  • Current regulation for a Series Active Filter integrated with a diode rectifier
    IEEE 34th Annual Conference on Power Electronics Specialist 2003. PESC '03., 2003
    Co-Authors: A.d. Le Roux, Hdu.t. Mouton, H. Akagi
    Abstract:

    This paper deals with digital control of a Series Active Filter integrated with a diode rectifier where the Series Active Filter is controlled to function as a current source. A predictive current regulator is considered for the Series Active Filter to achieve good ripple characteristics and predictable switching losses. The operating conditions, and the effect there of on the current regulator are considered and oversampling and prediction of the load voltage is suggested to improve the Active Filtering performance without increasing the switching frequency.

  • Digital control of an integrated Series Active Filter and diode rectifier with voltage regulation
    IEEE Transactions on Industry Applications, 2003
    Co-Authors: A.d. Le Roux, Hdu.t. Mouton, H. Akagi
    Abstract:

    The integration of a Series Active Filter with a 12-pulse diode rectifier can provide a cost-effective and efficient means of supply current harmonic-free AC/DC conversion. Controlling the Series Active Filter as a frequency-selective impedance requires low delays and is not well suited for digital control. This paper suggests a current-mode control strategy to allow full digital control of the Active Filter. The suggested current-mode control method for supply current balancing and voltage regulation is verified experimentally.

  • A DC model for transient analysis of a Series Active Filter integrated with a double-Series diode rectifier
    IEEE Transactions on Industry Applications, 2003
    Co-Authors: S. Srianthumrong, H. Akagi
    Abstract:

    This paper deals with transient analysis of a Series Active Filter integrated with a double-Series diode rectifier. A DC model is developed with the help of the p-q coordinates transformation. It can be used to accurately and simply analyze transient characteristics around the fundamental frequency of the integrated system. The analysis using the DC model tells us that either increasing the Active Filter gain or decreasing the cut-off frequency of low-pass Filters used in the harmonic detector results in a slow response, and causes a large and long transient of the DC voltage. Simulation results using a software package "EMTDC" and experimental results verify the validity of the proposed DC model.

  • Digital control of an integrated Series Active Filter and passive rectifier with voltage regulation
    Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579), 2002
    Co-Authors: A.d. Le Roux, Hdu.t. Mouton, H. Akagi
    Abstract:

    The integration of a Series Active Filter with a 12-pulse diode rectifier can provide an effective means for supply current harmonic free AC/DC conversion. Controlling the Series Active Filter as a frequency selective impedance requires low delays and is not well suited for implementation by digital control. This paper suggests two control methods intended for implementation by digital control. The suggested current-mode control method for supply current balancing and voltage regulation is verified experimentally.

Hirofumi Akagi - One of the best experts on this subject based on the ideXlab platform.

  • Instantaneous Power Theory and Applications to Power Conditioning - Hybrid and Series Active Filters
    Instantaneous Power Theory and Applications to Power Conditioning, 2020
    Co-Authors: Hirofumi Akagi, E H Watanabe, M Aredes
    Abstract:

    The Series Active Filter acts like a dual device for the shunt Active Filter. The shunt Active Filter has a voltage source at the source side and a current source at the load side, where the current source includes harmonic currents that have to be compensated by the shunt Active Filter. In some cases, the combination of a voltage source and its impedance at the source side is considered as a current source. As a result, the Series Active Filter operates as a dual circuit of the shunt Active Filter from a theoretical point of view. Comprehensive research has been conducted on hybrid Active Filters for harmonic Filtering, harmonic damping, harmonic isolation, and harmonic termination. This chapter presents a transformer less hybrid Active Filter integrated into a medium‐voltage motor drive for energy savings. It discusses the stability of the ac/dc power conversion system characterized by integration of a Series Active Filter with a double‐Series diode rectifier.

  • DFT-Based Repetitive Control of a Series Active Filter Integrated With a 12-Pulse Diode Rectifier
    IEEE Transactions on Power Electronics, 2009
    Co-Authors: Abraham Le D. Roux, Hdu.t. Mouton, Hirofumi Akagi
    Abstract:

    This paper considers the transient performance and stability of a recurrent discrete Fourier transform (DFT) based control method for a Series Active Filter integrated with a 12-pulse diode rectifier. The control method targets specific harmonics and/or the negative sequence fundamental component of the supply current, and is intended for use with nonsinusoidal/unbalanced supply voltages. The proposed control method is based on DFTs instead of the dq-method, and a simple approach is used to account for small frequency variations found in practical power systems.

  • instantaneous power theory and applications to power conditioning
    2007
    Co-Authors: Hirofumi Akagi, E H Watanabe, M Aredes
    Abstract:

    Preface. 1. Introduction. 1.1. Concepts and Evolution of Electric Power Theory. 1.2. Applications of the p-q Theory to Power Electronics Equipment. 1.3. Harmonic Voltages in Power Systems. 1.4. Identified and Unidentified Harmonic-Producing Loads. 1.5. Harmonic Current and Voltage Sources. 1.6. Basic Principles of Harmonic Compensation. 1.7. Basic Principles of Power Flow Control. References. 2. Electric Power Definitions: Background. 2.1. Power Definitions Under Sinusoidal Conditions. 2.2. Voltage and Current Phasors and the Complex Impedance. 2.3. Complex Power and Power Factor. 2.4. Concepts of Power Under Non-Sinusoidal Conditions -Conventional Approaches. 2.5. Electric Power in Three-Phase Systems. 2.6. Summary. References. 3 The Instantaneous Power Theory. 3.1. Basis of the p-q Theory. 3.2. The p-q Theory in Three-Phase, Three-Wire Systems. 3.3. The p-q Theory in Three-Phase, Four-Wire Systems. 3.4. Instantaneous abc Theory. 3.5. Comparisons between the p-q Theory and the abc Theory. 3.6. Summary. References. 4 Shunt Active Filters. 4.1. General Description of Shunt Active Filters. 4.2. Three-Phase, Three-Wire Shunt Active Filters. 4.3. Three-Phase, Four-Wire Shunt Active Filters. 4.4. Shunt Selective Harmonic Compensation. 4.5. Summary. References. 5 Hybrid and Series Active Filters. 5.1. Basic Series Active Filter. 5.2. Combined Series Active Filter and Shunt Passive Filter. 5.3. Series Active Filter Integrated with a Double-Series Diode Rectifier. 5.4. Comparisons Between Hybrid and Pure Active Filters. 5.5. Conclusions. References. 6 Combined Series and Shunt Power Conditioners. 6.1. The Unified Power Flow Controller (UPFC). 6.2. The Unified Power Quality Conditioner (UPQC). 6.3. The Universal Active Power Line Conditioner (UPLC). 6.4. Summary. References. Index.

  • DC magnetic deviation in the matching transformer of a Series Active Filter, and its suppression
    Electrical Engineering in Japan, 2003
    Co-Authors: Hiroshi Hasegawa, Hirofumi Akagi, Sunt Srianthumrong, Hideaki Fujita
    Abstract:

    This paper deals with a Series Active Filter for harmonic-current compensation of a large-capacity diode rectifier with a capacitive load. Flux saturation may occur in a Series matching transformer for connecting the Series Active Filter to the ac side of the diode rectifier. This paper develops an analog controller of a dc magnetizing current flowing in the matching transformer, along with a model for the controller, to avoid the flux saturation. Operating characteristics of the controller are theoretically and experimentally discussed, taking into account both an offset voltage in the controller and an error in a current sensor. Finally, this paper discusses a relation between magnetizing characteristics of the matching transformer and the amplitude of the magnetizing current. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 144(2): 63–72, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10188

  • dc magnetic deviation and its suppression of a matching transformer in a Series Active Filter
    Ieej Transactions on Industry Applications, 2002
    Co-Authors: Hiroshi Hasegawa, Hirofumi Akagi, Sunt Srianthumrong, Hideaki Fujita
    Abstract:

    This paper deals with a Series Active Filter for harmonic-current compensation of a large-capacity diode rectifier with a capacitive load. Flux satulation may occur in a Series matching transformer for connecting the Series Active Filter to the ac side of the diode rectifier. This paper develops an analog controller of a dc magnetizing current flowing in the matching transformer, along with a model for the controller, to avoid the flux satulation. Operating characteristics of the controller are theoretically and exprimentally discussed, taking into account both an offset voltage in the controller and an error in a current sensor. Finally, this paper discusses a relation between magnetizing characteristics of the matching transformer and the amplitude of the magnetizing current.

Hideaki Fujita - One of the best experts on this subject based on the ideXlab platform.

  • DC magnetic deviation in the matching transformer of a Series Active Filter, and its suppression
    Electrical Engineering in Japan, 2003
    Co-Authors: Hiroshi Hasegawa, Hirofumi Akagi, Sunt Srianthumrong, Hideaki Fujita
    Abstract:

    This paper deals with a Series Active Filter for harmonic-current compensation of a large-capacity diode rectifier with a capacitive load. Flux saturation may occur in a Series matching transformer for connecting the Series Active Filter to the ac side of the diode rectifier. This paper develops an analog controller of a dc magnetizing current flowing in the matching transformer, along with a model for the controller, to avoid the flux saturation. Operating characteristics of the controller are theoretically and experimentally discussed, taking into account both an offset voltage in the controller and an error in a current sensor. Finally, this paper discusses a relation between magnetizing characteristics of the matching transformer and the amplitude of the magnetizing current. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 144(2): 63–72, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10188

  • dc magnetic deviation and its suppression of a matching transformer in a Series Active Filter
    Ieej Transactions on Industry Applications, 2002
    Co-Authors: Hiroshi Hasegawa, Hirofumi Akagi, Sunt Srianthumrong, Hideaki Fujita
    Abstract:

    This paper deals with a Series Active Filter for harmonic-current compensation of a large-capacity diode rectifier with a capacitive load. Flux satulation may occur in a Series matching transformer for connecting the Series Active Filter to the ac side of the diode rectifier. This paper develops an analog controller of a dc magnetizing current flowing in the matching transformer, along with a model for the controller, to avoid the flux satulation. Operating characteristics of the controller are theoretically and exprimentally discussed, taking into account both an offset voltage in the controller and an error in a current sensor. Finally, this paper discusses a relation between magnetizing characteristics of the matching transformer and the amplitude of the magnetizing current.

  • Stability analysis of a Series Active Filter integrated with a double-Series diode rectifier
    2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018), 2000
    Co-Authors: S. Srianthumrong, Hideaki Fujita, H. Akagi
    Abstract:

    This paper deals with a harmonic current-free AC/DC power conversion system which is characterized by the integration of a small-rated Series Active Filter with a large-rated double-Series diode rectifier. The stability of the Active Filter based on feedback control is discussed theoretically, taking into account delay time in the control circuit. As a result, it is revealed that the delay time may produce a bad effect on stability, especially when the power conversion system is installed on a stiff power system with low system inductance. The authors propose a viable way of reducing the effect of delay time on the system stability. Analysis in the frequency domain enables us to know how much the system stability is improved in terms of gain and phase margins. A switching-ripple Filter is designed to obtain good Filtering performance without affecting the system stability. Experimental results obtained from a 20-kW laboratory system verify the validity of the developed theory, and confirm the viability and effectiveness of the proposed control circuit.

  • Combined rectifying system including double-Series capacitor-smoothed diode rectifier and Series Active Filter
    Electrical Engineering in Japan, 1997
    Co-Authors: Hideaki Fujita, Hirofumi Akagi, Masakazu Kohata
    Abstract:

    This paper proposes a new rectifying system consisting of a Series Active Filter and a double-Series three-phase 12-pulse diode rectifier. The supply current in the proposed system has a sinusoidal wave shape because the Series Active Filter suppresses the current harmonics produced by the diode rectifier. Since almost no 5th and 7th harmonics are produced by the double-Series 12-pulse diode rectifier, the required peak rating of the Series Active Filter is only 7% of the diode rectifier. In this paper, the control scheme and operating characteristics of the Series Active Filter are theoretically and experimentally discussed. A novel conception that connection of a parallel capacitor to each diode of the rectifier makes a great contribution to reducing the required rating of the Series Active Filter is also presented and verified by some experimental results. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 120(1): 85–94, 1997

  • An approach to harmonic current-free AC/DC power conversion for large industrial loads: the integration of a Series Active Filter with a double-Series diode rectifier
    IEEE Transactions on Industry Applications, 1997
    Co-Authors: Hideaki Fujita, H. Akagi
    Abstract:

    This paper proposes a new harmonic current-free AC/DC power conversion system characterized by the integration of a small-rated Series Active Filter, with a large-rated double-Series diode rectifier. The DC terminals of the Active Filter are directly connected in parallel with those of the diode rectifier, thereby forming a common DC bus. The Active Filter enables the diode rectifier to draw three-phase sinusoidal currents from the utility. In addition, it can provide the supplementary value-added function of regulating the common DC-bus voltage to a limited extent of /spl plusmn/5%, slightly increasing the RMS voltage rating, but not increasing the peak voltage rating. Experimental results obtained from a 5 kW laboratory system verify the practical viability and cost effectiveness of the proposed system.

Ahmet M. Hava - One of the best experts on this subject based on the ideXlab platform.

  • Series Active Filter based resonance damping of high power three-phase, LCL Filtered, grid connected voltage source inverters
    2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE), 2014
    Co-Authors: Nadir S. Usluer, Ahmet M. Hava
    Abstract:

    A Series Active Filter (SAF) based method for the damping of resonant harmonics created by the LCL-Filter of the grid connected PWM-VSI is proposed. Oscillations in multi-megawatt rated high power inverters with LCL-Filters are damped with resistors which create undesired power losses typically up to 1% of the rated power of the system. The method stated in this paper overcomes the stability/oscillation problem while providing a solution to the resistive power loss. The proposed SAF compensated system performs satisfactorily under rated load conditions and the transition from passive damping to SAF is flawless. Adaptability of the proposed method to dynamic loads is also advantageous as opposed to passive damping methods. Simplified circuit diagrams and schematics are provided through the paper. Mathematical model of the passively damped Filter is compared and contrasted with the SAF compensated system. The validity of the proposed method is proven via simulations.

  • ISIE - Series Active Filter based resonance damping of high power three-phase, LCL Filtered, grid connected voltage source inverters
    2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE), 2014
    Co-Authors: S. Nadir Usluer, Ahmet M. Hava
    Abstract:

    A Series Active Filter (SAF) based method for the damping of resonant harmonics created by the LCL-Filter of the grid connected PWM-VSI is proposed. Oscillations in multi-megawatt rated high power inverters with LCL-Filters are damped with resistors which create undesired power losses typically up to 1% of the rated power of the system. The method stated in this paper overcomes the stability/oscillation problem while providing a solution to the resistive power loss. The proposed SAF compensated system performs satisfactorily under rated load conditions and the transition from passive damping to SAF is flawless. Adaptability of the proposed method to dynamic loads is also advantageous as opposed to passive damping methods. Simplified circuit diagrams and schematics are provided through the paper. Mathematical model of the passively damped Filter is compared and contrasted with the SAF compensated system. The validity of the proposed method is proven via simulations.

  • Investigation on Series Active Filter compensated high power grid-connected voltage source inverters with LCL Filter
    2014 IEEE Energy Conversion Congress and Exposition (ECCE), 2014
    Co-Authors: Nadir S. Usluer, Ahmet M. Hava
    Abstract:

    This paper deals with Series Active Filter (SAF) based damping methods for the LCL Filters of three-phase, grid connected, low voltage, high power Voltage Source Inverters (VSIs). The inherent resonance problem of LCL Filters is damped via passive or Active damping methods. Passive damping methods employing damping resistors create significant power losses reducing the overall system's efficiency for high power inverters. Active damping methods, on the other hand, are not applicable due to inverter's limited controller bandwidth. Unlike passive and Active damping approaches, the proposed Series Active Filter (SAF) based systems maintain the stability of the inverter while eliminating the resistive power losses. The steady-state and dynamic performances of the SAF compensated VSIs are investigated and viability of them are demonstrated. Two novel methods, one superior than the other in terms of design simplicity are investigated providing efficiency, line current THD and dynamic response results. The developed methods are proven by theory and computer simulations.

  • High-Performance Harmonic Isolation and Load Voltage Regulation of the Three-Phase Series Active Filter Utilizing the Waveform Reconstruction Method
    IEEE Transactions on Industry Applications, 2009
    Co-Authors: Osman S. Senturk, Ahmet M. Hava
    Abstract:

    This paper develops a waveform reconstruction method (WRM) for high accuracy and bandwidth signal decomposition of voltage-harmonic-type three-phase diode rectifier load voltage into its harmonic and fundamental components, which are utilized in the Series Active Filter (SAF) control algorithms. The SAF-compensated system utilizing WRM provides high-performance load harmonic voltage isolation and load voltage regulation at steady-state and during transients compared to the system utilizing the synchronous reference-frame-based signal decomposition. In addition, reducing the line current sampling delay in the discrete-time implementation enhances the stability of the SAF. The simulations and experimental studies of a 10-kW three-phase SAF-compensated system prove the theory.

  • IAS - High Performance Harmonic Isolation and Load Voltage Regulation of the Three-Phase Series Active Filter Utilizing the Waveform Reconstruction Method
    2008 IEEE Industry Applications Society Annual Meeting, 2008
    Co-Authors: Osman S. Senturk, Ahmet M. Hava
    Abstract:

    This paper develops the waveform reconstruction method (WRM) for high accuracy and bandwidth signal decomposition of voltage harmonic type (V-type) three-phase diode rectifier load voltage into its harmonic and fundamental components, which are utilized in the Series Active Filter (SAF) control algorithms. The SAF compensated system utilizing WRM provides high performance load harmonic voltage isolation and load voltage regulation at steady-state and during transients compared to the system utilizing the synchronous reference frame based signal decomposition. Additionally, reducing the line current sampling delay in the discrete-time implementation enhances the stability of the SAF. The simulations and experimental studies of a 10 kW three-phase SAF compensated system prove the theory.

T. Shimizu - One of the best experts on this subject based on the ideXlab platform.

  • Control methods and compensation characteristics of a Series Active Filter for neutral conductor
    Electrical Engineering in Japan, 2020
    Co-Authors: S. Inoue, Keiji Wada, T. Shimizu
    Abstract:

    With an increase in the number of electronic devices, such as personal computers, connected to power distribution lines in commercial buildings, problems associated with their use, such as voltage distortion on utility outlets and excessive neutral current on the distribution lines, become more and more serious. This paper shows control methods and compensation characteristics of Series Active Filters connected to the neutral conductor. The distinctive functions of the proposed Active Filter are the mitigation of third harmonic voltage and the reduction of neutral current in three-phase four-wire distribution systems. The required kVA rating of the proposed Active Filter is less than 10% of that of the harmonic producing leads. A control method of the DC capacitor voltage on the Active Filter circuit is also described. It was experimentally demonstrated that one of these two functions of the Active Filter (to mitigate harmonics or to reduce the neutral current) can be realized selectively and that the DC capacitor voltage of the Active Filter can be regulated to a desired value. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 155(4): 53–63, 2006; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/eej.20227

  • Mitigation of third-harmonic voltage for three-phase four-wire distribution system based on a Series Active Filter for neutral conductor
    Electrical Engineering in Japan, 2020
    Co-Authors: Keiji Wada, S. Inoue, T. Shimizu
    Abstract:

    This paper proposes a Series Active Filter for mitigation of the third-harmonic voltage in a three-phase four-wire power distribution system in a building. The Active Filter which consists of a single-phase inverter can suppress the harmonic voltage of the system. The Active Filter is characterized by acting not only as a capacitor but also as a resistor for the third-harmonic components. A Hilbert transformer is applied to the controller of the Active Filter in order to realize accurate third-harmonic detection on a single-phase Active Filter. Measurement results of harmonic distortion of source voltage in a building is also shown in this paper. It is clarified in a simulation and experiment that the Active Filter can suppress the third-harmonic voltage without increasing neutral conductor current. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 62–70, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10379

  • Control Methods and Compensation Characteristics of a Series Active Filter for a Neutral Conductor
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: S. Inoue, T. Shimizu, Keiji Wada
    Abstract:

    Due to the advance of information technologies, a large number of electronic products such as personal computers have been connected to power distribution systems in commercial buildings. Hence, voltage distortion on utility outlets and excessive neutral current on distribution lines have arisen and lead to a number of serious problems in the distribution system. Two control methods and the related compensation characteristics of a Series Active Filter connected to the neutral conductor are presented in this paper. The distinct functions of the proposed Active Filter are the mitigation of the third-harmonic voltage and the neutral current in a three-phase four-wire distribution system in a building. The required power of the proposed Active Filter is less than 10% of that of the harmonic-producing loads. A control method of the dc capacitor voltage on the Active Filter circuit is also described. It is clarified through experiments that one of the two functions of the Active Filter can be realized selectively and the dc capacitor voltage of the Active Filter can be regulated to a desired value

  • Control strategy for a Series Active Filter for the neutral conductor in a building and its installation point
    38th IAS Annual Meeting on Conference Record of the Industry Applications Conference 2003., 2003
    Co-Authors: Keiji Wada, S. Inoue, T. Shimizu
    Abstract:

    This paper presents control strategy of the Series Active Filter connected to the neutral conductor on the three-phase four-wire distribution system in a building. Harmonic distortion in the building is measured, and it is clarified that the third-harmonic voltage on the upper floor is larger than that on the lower floor because of the influence of line inductances between each floor. The optimum installation point of the Active Filter in the multi-story buildings is presented. In addition, control strategy for the DC bus voltage in the Active Filter is studied. Experimental results obtained from a 200-V, 3-kVA laboratory system verify the effectiveness of the Series Active Filter.

  • Control methods and compensation characteristics of a Series Active Filter for the neutral conductor
    IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468), 2003
    Co-Authors: S. Inoue, T. Shimizu, Keiji Wada
    Abstract:

    Due to the advance of information technologies, a large number of electronic products such as personal computers have been connected to power distribution systems in commercial buildings. Hence, voltage distortion on utility outlets and excessive neutral current on distribution lines have arisen, and those lead to a number of serious problems in the distribution system. Two control methods and the related compensation characteristics of a Series Active Filter connected to the neutral conductor are presented in this paper. The distinct functions of the proposed Active Filter are mitigation of 3rd-harmonic voltage and neutral current in a three-phase four-wire distribution system in a building. The required power of the proposed Active Filter is less than 10% of that of the harmonic producing loads. A control method of the dc capacitor voltage on the Active Filter circuit is also described. it is clarified through experiments that one those two functions of the Active Filter can be realized selectively and the dc capacitor voltage of the Active Filter can be regulated to a desired value.

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