A Unidirectional Insulated AC–DC Converter Based on the Hexverter and Multipulse-Rectifier

Lambert, Gustavo; Costabeber, Alessandro; Wheeler, Patrick; Novaes, Yales Rômulo de

doi:10.1109/tpel.2019.2928555

Cited by 5 publications

(2 citation statements)

References 24 publications

(28 reference statements)

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“…Twelve-pulse topology has been known as early as in the 1980s [14,26] and widely used in industry to date [5,[27][28][29]. However, the first attempts to use this topology (with coupled reactors) in the inverter mode of operation were made only several years ago [1,7].…”

Section: The 12-pulse Modular Voltage Source Inverter With Coupled Reactorsmentioning

confidence: 99%

Hybrid Modulation for Modular Voltage Source Inverters with Coupled Reactors

et al. 2020

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This paper proposes and discusses a concept of a hybrid modulation for the control of modular voltage source inverters with coupled reactors. The use of coupled reactors as the integrating elements leads to significant reduction in the size and weight of the circuit. The proposed modulation combines novel coarsely quantized pulse amplitude modulation (CQ-PAM) and innovative space-vector pulse width modulation (SVPWM). The former enjoys very low transistor switching frequency and low harmonic elimination, while the latter ensures high resolution of amplitude control. The SVPWM is based on the use of barycentric coordinates. The feasibility of the proposed solution is verified by simulations and laboratory tests of a 12-pulse modular voltage source inverters with two-level and three-level component inverters.

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Section: The 12-pulse Modular Voltage Source Inverter With Coupled Reactorsmentioning

confidence: 99%

Hybrid Modulation for Modular Voltage Source Inverters with Coupled Reactors

et al. 2020

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“…In [7], the authors developed a state-space model of Hexverter in the αβ frame and verified its operating characteristics using an experimental prototype. In [8]- [10], based on the statespace model, a frequency-decoupled branch current control model in the dq reference frame was presented, and the operating principle and characteristic waveforms were verified with a simulation and experimental prototype. To solve the problems of difficulty in tuning proportional-integral (PI) parameters to ensure global stability, a global asymptotical stable control scheme of Hexverter based on the IDA-PBC methodology was presented in [11].…”

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

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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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