The Experts below are selected from a list of 10167 Experts worldwide ranked by ideXlab platform

Chunting Mi - One of the best experts on this subject based on the ideXlab platform.

  • three level inverter based shunt active power filter in three phase three wire and four wire systems
    IEEE Transactions on Power Electronics, 2009
    Co-Authors: O Vodyakho, Chunting Mi
    Abstract:

    This paper presents a direct current-space-vector control of an active power filter (APF) based on a three-level Neutral-point-clamped (NPC) voltage-source inverter. The proposed method indirectly generates the compensation current reference by using an equivalent conductance of the fundamental component using APF's dc-link voltage control. The proposed control can selectively choose harmonic current components by real-time fast Fourier transform to generate the compensation current. The compensation current is represented in a rotating coordinate system with chosen switching states from a switching table implemented in a field-programmable gate array. In addition, a three-phase four-wire APF based on a three-level Neutral-point-clamped inverter is also presented. The proposed APF eliminates harmonics in all three phases as well as the Neutral current. A three-phase three-wire NPC inverter system can be used as a three-phase four-wire system since the split dc capacitors provide a Neutral Connection. To regulate and balance the split dc-capacitor voltages, a new control method using a sign cubical hysteresis controller is proposed. The characteristics of the APF system with an LCL-ripple filter are investigated and compared with traditional current control strategies to evaluate the inherent advantages. The simulation and experimental results validated the feasibility of the proposed APF.

O Vodyakho - One of the best experts on this subject based on the ideXlab platform.

  • three level inverter based shunt active power filter in three phase three wire and four wire systems
    IEEE Transactions on Power Electronics, 2009
    Co-Authors: O Vodyakho, Chunting Mi
    Abstract:

    This paper presents a direct current-space-vector control of an active power filter (APF) based on a three-level Neutral-point-clamped (NPC) voltage-source inverter. The proposed method indirectly generates the compensation current reference by using an equivalent conductance of the fundamental component using APF's dc-link voltage control. The proposed control can selectively choose harmonic current components by real-time fast Fourier transform to generate the compensation current. The compensation current is represented in a rotating coordinate system with chosen switching states from a switching table implemented in a field-programmable gate array. In addition, a three-phase four-wire APF based on a three-level Neutral-point-clamped inverter is also presented. The proposed APF eliminates harmonics in all three phases as well as the Neutral current. A three-phase three-wire NPC inverter system can be used as a three-phase four-wire system since the split dc capacitors provide a Neutral Connection. To regulate and balance the split dc-capacitor voltages, a new control method using a sign cubical hysteresis controller is proposed. The characteristics of the APF system with an LCL-ripple filter are investigated and compared with traditional current control strategies to evaluate the inherent advantages. The simulation and experimental results validated the feasibility of the proposed APF.

  • shunt active filter based on three level inverter for three phase four wire systems
    Iet Power Electronics, 2009
    Co-Authors: O Vodyakho, Taehyung Kim
    Abstract:

    The three-phase four-wire active power filter (APF) based on a three-level Neutral-point-clamped (NPC) inverter is presented. The proposed APF and controller eliminate harmonics in all three phases as well as the Neutral current. The existing NPC inverter for a three-phase three-wire system is used for the three-phase four-wire system since the split DC capacitors provide a Neutral Connection. To regulate and balance the split DC-capacitor voltages, the new control using the sign cubical hysteresis controller is proposed. The control method discerns the harmonic currents by fast Fourier transform choosing switching states from a switching table based on the hysteresis control. The simulation and experimental results verify the feasibility of the three-phase four-wire APF.

F C Lee - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional space vector modulation for four leg voltage source converters
    IEEE Transactions on Power Electronics, 2002
    Co-Authors: R Zhang, V H Prasad, Dushan Boroyevich, F C Lee
    Abstract:

    Four-leg voltage-source converters can effectively provide the Neutral Connection in three-phase four-wire systems. They can be used in inverter, rectifier, and active filter applications to handle the Neutral current caused by the unbalanced and/or nonlinear load or unbalanced source. In this paper, three-dimensional (3-D) space vector modulation (SVM) schemes are proposed for controlling the four-leg voltage-source converters. Important issues for 3-D SVM, such as definition of 3-D vectors, identification of adjacent switching vectors in the 3-D space, and switching vector sequencing schemes and comparisons are addressed. The proposed 3-D SVM is a superset of the traditional two-dimensional (2-D) SVM, and thus it inherits all the merits of the traditional 2-D SVM. A 100 kW 5 kHz four-leg inverter and a 20 kHz four-leg rectifier prototypes are built and controlled by the proposed 3-D SVM. Experimental results are presented to validate the effectiveness of the 3-D SVM.

R Zhang - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional space vector modulation for four leg voltage source converters
    IEEE Transactions on Power Electronics, 2002
    Co-Authors: R Zhang, V H Prasad, Dushan Boroyevich, F C Lee
    Abstract:

    Four-leg voltage-source converters can effectively provide the Neutral Connection in three-phase four-wire systems. They can be used in inverter, rectifier, and active filter applications to handle the Neutral current caused by the unbalanced and/or nonlinear load or unbalanced source. In this paper, three-dimensional (3-D) space vector modulation (SVM) schemes are proposed for controlling the four-leg voltage-source converters. Important issues for 3-D SVM, such as definition of 3-D vectors, identification of adjacent switching vectors in the 3-D space, and switching vector sequencing schemes and comparisons are addressed. The proposed 3-D SVM is a superset of the traditional two-dimensional (2-D) SVM, and thus it inherits all the merits of the traditional 2-D SVM. A 100 kW 5 kHz four-leg inverter and a 20 kHz four-leg rectifier prototypes are built and controlled by the proposed 3-D SVM. Experimental results are presented to validate the effectiveness of the 3-D SVM.

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

  • Multi Level Voltage Space Phasor Generation for an Open-End Winding Induction Motor Drive Using a Dual Inverter Scheme with Asymmetrical DC-Link Voltages
    EPE Journal, 2002
    Co-Authors: V T Somasekhar, E.g. Shivakumar, Andre Pittet
    Abstract:

    AbstractAn open-end winding induction motor drive fed from two inverters with different DC-link voltages is proposed in this paper. A total of 64 voltage space phasor combinations are possible in this scheme, as each inverter is capable of producing 8-voltage space phasors independently of the other. The proposed scheme produces 37 voltage space phasor locations while a 3-level inverter produces only 18 voltage space phasor locations. In the proposed scheme, the Neutral Connection of the induction motor is removed (open-end winding) and is fed from both the ends. Two 2-level inverters with isolated DC-link voltages of 2/3 Vdc and 1/3 Vdc are used for driving the motor, where Vdc denotes the DC-link voltage of an equivalent conventional (single-inverter) scheme. A combination of two 2-level inverters with 2/3 Vdc and 1/3 Vdc DC-link voltages produces a total of 64 voltage space phasor combinations in 37 space phasor locations. The voltage space phasor locations can be associated with three regions accordin...

  • A multi level space phasor based PWM strategy for an open-end winding induction motor drive using two inverters with different DC link voltages
    4th IEEE International Conference on Power Electronics and Drive Systems. IEEE PEDS 2001 - Indonesia. Proceedings (Cat. No.01TH8594), 2001
    Co-Authors: E.g. Shivakumar, V T Somasekhar, K K Mohapatra, L. Umanand, S.k. Sinha
    Abstract:

    An open-end winding induction motor drive fed from two inverters with different DC link voltages is proposed in this paper. A total of 64 voltage space phasor combinations are possible in this scheme as each inverter produces 8 voltage space phasors. The proposed scheme produces voltage space phasor locations more than that of a 3-level inverter. A total of 37 space phasor locations are possible from the proposed scheme as compared to 18 voltage space phasor locations in a 3-level inverter. In the proposed scheme, the induction motor Neutral Connection is separated (open-end winding) and fed from both the ends. Two 2-level inverters with DC link voltages of 2/3 VDC and 1/3 VDC are used for driving the motor. Here VDC is the conventional 2-level inverter DC link voltage for identical power. A combination of two 2-level inverters with 2/3 VDC and 1/3 VDC DC-link voltages will produce a total of 64 voltage space phasor combinations in 37 space phasor locations. For the present scheme a space phasor based PWM scheme will produce stepped voltage waveforms for the motor phases in different speed ranges. The whole voltage space phasor locations can be divided into three regions according to the speed range. In the lower speed range the PWM phase voltage will have a six-step envelope (similar to the conventional scheme) and In the middle range the PWM motor phase voltage will have an 12-step envelope and the outer speed range (including the over modulation) the PWM motor phase voltage will have an 18-step envelope. A simple and elegant space phasor based PWM scheme is proposed in all sectors based on three phase motor reference voltages only. The sector identification is achieved by comparing the components of the motor reference voltages, using simple hysteresis comparators, along the three orthogonal axes to the a,b,c phase axes. The whole scheme is studied for a 1 hp open-end winding motor and the results of the study including the over modulation ranges are presented in this paper.