Circulating Current Suppressing Strategy Based on Zero-sequence Network Model for Hexverter

Yang, Yi; Chong, Qian; Gui, Yaojie; Yang, Gang

doi:10.1109/iccs52645.2021.9697310

Cited by 1 publication

(2 citation statements)

References 7 publications

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“…Hexverter directly connects two three-phase systems. The two three-phase systems are alternately connected to the connection points of the branches [15].…”

Section: Principle Of Operation a Topology Of The Hexvertermentioning

confidence: 99%

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Branch Voltage Balancing Control Strategy Based on the Transfer Power Model by Zero-Sequence Circulating Current for the Hexverter

Yang

Qian

et al. 2022

IEEE Access

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This paper proposes a novel branch voltage-balancing control strategy for a hexagonal converter (Hexverter). First, the state-space model based on the double-dq transformation is analyzed in-depth along with the necessary basic mathematical derivation, and the active/reactive power control model in the dq reference frame for the Hexverter is proposed. Second, a zero-sequence double-loop network consisting of a Y-loop and a Hex-loop circulating current was established. This study proposes a method to suppress the Y-loop circulating current by connecting a capacitor at the neutral point. We then establish a novel branch voltage-balancing control strategy based on the transfer power model. The essence of the proposed control strategy is to control the charging and discharging states of each submodule via the zero-sequence voltages and the Hex-loop circulating current to regulate the power transfer between adjacent submodules and branches, thereby effectively ensuring the dynamic balance of the DC voltages of the submodules. The branch voltage-balancing control model and power control model proposed in this paper are based on zero-sequence and positive-sequence networks, respectively. The relative independence of the positive-and zero-sequence networks leads to decoupling of the branch voltage-balancing control model and the power control model; thus, the respective control objectives can be achieved by adjusting the respective control variables independently. It has a stronger adaptability to diverse power grid operating parameters. Finally, the validity and correctness of the mathematical model and control strategy proposed in this study are verified using MATLAB/Simulink.INDEX TERMS Hexverter, double-dq transformation, the zero-sequence double-loop network, the transfer power model, the voltage balancing control, circulating current suppression.

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“…Hexverter directly connects two three-phase systems. The two three-phase systems are alternately connected to the connection points of the branches [15].…”

Section: Principle Of Operation a Topology Of The Hexvertermentioning

confidence: 99%

“…In this study, a novel branch voltage-balancing control strategy was proposed. First, based on the state-space model, a control strategy in a double-dq frame for Hexverter was proposed [15]. It realizes flexible active/reactive power control on both sides and achieves overall stability of the stored energy.…”

Section: Introductionmentioning

confidence: 99%

Branch Voltage Balancing Control Strategy Based on the Transfer Power Model by Zero-Sequence Circulating Current for the Hexverter

Yang

Qian

et al. 2022

IEEE Access

View full text Add to dashboard Cite

show abstract

Circulating Current Suppressing Strategy Based on Zero-sequence Network Model for Hexverter

Cited by 1 publication

References 7 publications

Branch Voltage Balancing Control Strategy Based on the Transfer Power Model by Zero-Sequence Circulating Current for the Hexverter

Branch Voltage Balancing Control Strategy Based on the Transfer Power Model by Zero-Sequence Circulating Current for the Hexverter

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