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Yingduo Han - One of the best experts on this subject based on the ideXlab platform.

  • application of a three level npc inverter as a three phase four wire power quality compensator by generalized 3dsvm
    IEEE Transactions on Power Electronics, 2006
    Co-Authors: Ningyi Dai, Manchung Wong, Yingduo Han
    Abstract:

    A two-level four-leg inverter has been developed for the three-phase Four-Wire power quality compensators. When it is applied to medium and large capacity compensators, the voltage stress across each switch is so high that the corresponding dv/dt causes large electromagnetic interference. The multilevel voltage source inverter topologies are good substitutes, since they can reduce voltage stress and improves output harmonic contents. The existing three-level neutral point clamped (NPC) inverter in three-phase three-wire Systems can be used in three-phase Four-Wire Systems also, because the split dc capacitors provide a neutral connection. This paper presents a comparison study between the three-level four-leg NPC inverter and the three-level NPC inverter. A fast and generalized applicable three-dimensional space vector modulation (3DSVM) is proposed for controlling a three-level NPC inverter in a three-phase Four-Wire System. The zero-sequence component of each vector is considered in order to implement the neutral current compensation. Both simulation and experimental results are given to show the effectiveness of the proposed 3DSVM control strategy. Comparisons between the 3DSVM and the 3-D hysteresis control strategy are also achieved.

  • controlling trilevel center split power quality compensator by 3 dimensional space vector modulation
    International Conference on Power Electronics and Drive Systems, 2003
    Co-Authors: Ningyi Dai, Manchung Wong, Yingduo Han
    Abstract:

    In the past researches, strategies based on hysteresis control are proposed for controlling trilevel 3-leg center-split inverter, which can be used as a shunt power quality compensator for three-phase Four-Wire System. In this paper, results indicate that the complicated 3-dimensional (3D) space vector allocation of the trilevel center-split inverter can be simplified into six space vector regions of two-level center-split inverter. Thus, based on the 3D space vector modulation (3DSVM) control strategy for two-level center-split inverter, the novel 3DSVM control strategy for trilevel 3-leg center-split inverter is proposed. Different from the conventional 2-dimensional space vector modulation (2DSVM), the zero-axis component should be of a major concern in this novel 3DSVM since 3D space vectors are located in different horizontal planes and each vector contributes to zero-axis compensation. When the zero-axis component is considered, the neutral current of the three-phase Four-Wire System can be compensated simultaneously with three-phase current harmonics. Simulation results are given to show the validity of the proposed control strategy.

Ningyi Dai - One of the best experts on this subject based on the ideXlab platform.

  • application of a three level npc inverter as a three phase four wire power quality compensator by generalized 3dsvm
    IEEE Transactions on Power Electronics, 2006
    Co-Authors: Ningyi Dai, Manchung Wong, Yingduo Han
    Abstract:

    A two-level four-leg inverter has been developed for the three-phase Four-Wire power quality compensators. When it is applied to medium and large capacity compensators, the voltage stress across each switch is so high that the corresponding dv/dt causes large electromagnetic interference. The multilevel voltage source inverter topologies are good substitutes, since they can reduce voltage stress and improves output harmonic contents. The existing three-level neutral point clamped (NPC) inverter in three-phase three-wire Systems can be used in three-phase Four-Wire Systems also, because the split dc capacitors provide a neutral connection. This paper presents a comparison study between the three-level four-leg NPC inverter and the three-level NPC inverter. A fast and generalized applicable three-dimensional space vector modulation (3DSVM) is proposed for controlling a three-level NPC inverter in a three-phase Four-Wire System. The zero-sequence component of each vector is considered in order to implement the neutral current compensation. Both simulation and experimental results are given to show the effectiveness of the proposed 3DSVM control strategy. Comparisons between the 3DSVM and the 3-D hysteresis control strategy are also achieved.

  • controlling trilevel center split power quality compensator by 3 dimensional space vector modulation
    International Conference on Power Electronics and Drive Systems, 2003
    Co-Authors: Ningyi Dai, Manchung Wong, Yingduo Han
    Abstract:

    In the past researches, strategies based on hysteresis control are proposed for controlling trilevel 3-leg center-split inverter, which can be used as a shunt power quality compensator for three-phase Four-Wire System. In this paper, results indicate that the complicated 3-dimensional (3D) space vector allocation of the trilevel center-split inverter can be simplified into six space vector regions of two-level center-split inverter. Thus, based on the 3D space vector modulation (3DSVM) control strategy for two-level center-split inverter, the novel 3DSVM control strategy for trilevel 3-leg center-split inverter is proposed. Different from the conventional 2-dimensional space vector modulation (2DSVM), the zero-axis component should be of a major concern in this novel 3DSVM since 3D space vectors are located in different horizontal planes and each vector contributes to zero-axis compensation. When the zero-axis component is considered, the neutral current of the three-phase Four-Wire System can be compensated simultaneously with three-phase current harmonics. Simulation results are given to show the validity of the proposed control strategy.

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.

Hossain, Md. Jahangir - One of the best experts on this subject based on the ideXlab platform.

  • Neutral Current Compensation in a VSG-Based Three-Phase Four-Wire Microgrid System
    IEEE, 2018
    Co-Authors: Liu Jiannan, Rafi, Fida Hasan, Lu Junwei, Hossain, Md. Jahangir
    Abstract:

    A three-phase Four-Wire System is commonly used on the customer side as a low-voltage power System for supplying universal single-phase loads. The degree of unbalance in the distribution System is growing due to interconnections of distributed energy resources unevenly in different phases. The unbalanced loads may cause an excess neutral current, which can result in the neutral conductor overload and power System security problems. In this paper, a control strategy based on the virtual synchronous generator with a neutral current controller is proposed. The controller enables the microgrid to operate under both grid-connected and islanded mode with the minimum neutral current. A microgrid built in Griffith University, Australia is used to verify the performances of the designed control algorithm. From the results, it is found that the proposed controller ensures smooth transition of microgrids from the grid-tied mode to the islanding mode, while regulating the active, reactive and unbalanced power efficiently.No Full Tex

Manchung Wong - One of the best experts on this subject based on the ideXlab platform.

  • application of a three level npc inverter as a three phase four wire power quality compensator by generalized 3dsvm
    IEEE Transactions on Power Electronics, 2006
    Co-Authors: Ningyi Dai, Manchung Wong, Yingduo Han
    Abstract:

    A two-level four-leg inverter has been developed for the three-phase Four-Wire power quality compensators. When it is applied to medium and large capacity compensators, the voltage stress across each switch is so high that the corresponding dv/dt causes large electromagnetic interference. The multilevel voltage source inverter topologies are good substitutes, since they can reduce voltage stress and improves output harmonic contents. The existing three-level neutral point clamped (NPC) inverter in three-phase three-wire Systems can be used in three-phase Four-Wire Systems also, because the split dc capacitors provide a neutral connection. This paper presents a comparison study between the three-level four-leg NPC inverter and the three-level NPC inverter. A fast and generalized applicable three-dimensional space vector modulation (3DSVM) is proposed for controlling a three-level NPC inverter in a three-phase Four-Wire System. The zero-sequence component of each vector is considered in order to implement the neutral current compensation. Both simulation and experimental results are given to show the effectiveness of the proposed 3DSVM control strategy. Comparisons between the 3DSVM and the 3-D hysteresis control strategy are also achieved.

  • controlling trilevel center split power quality compensator by 3 dimensional space vector modulation
    International Conference on Power Electronics and Drive Systems, 2003
    Co-Authors: Ningyi Dai, Manchung Wong, Yingduo Han
    Abstract:

    In the past researches, strategies based on hysteresis control are proposed for controlling trilevel 3-leg center-split inverter, which can be used as a shunt power quality compensator for three-phase Four-Wire System. In this paper, results indicate that the complicated 3-dimensional (3D) space vector allocation of the trilevel center-split inverter can be simplified into six space vector regions of two-level center-split inverter. Thus, based on the 3D space vector modulation (3DSVM) control strategy for two-level center-split inverter, the novel 3DSVM control strategy for trilevel 3-leg center-split inverter is proposed. Different from the conventional 2-dimensional space vector modulation (2DSVM), the zero-axis component should be of a major concern in this novel 3DSVM since 3D space vectors are located in different horizontal planes and each vector contributes to zero-axis compensation. When the zero-axis component is considered, the neutral current of the three-phase Four-Wire System can be compensated simultaneously with three-phase current harmonics. Simulation results are given to show the validity of the proposed control strategy.