Modular Circulating Current and Second Harmonic Current Suppression Strategy by Virtual Impedance for DC Solid-State Transformer

Meng, Xiangqi; Jia, Yingmin; Ren, Chunguang; Han, Xiaoqing; Wang, Peng

doi:10.1109/tpel.2021.3068451

Cited by 12 publications

(3 citation statements)

References 32 publications

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“…According to the above analysis, the introduction of the low-pass filter ( ) Q z improves the stability of the system; however, it weakens the gain at high frequencies. The introduction of additional VI can equivalently increase the bridge arm reactance to improve the suppression of high-frequency harmonics and can share the circulating current suppression at low frequencies [27][28][29]. The virtual impedance is improved from the virtual reactance.…”

Section: Additional Virtual Impedance Designmentioning

confidence: 99%

Circulating Current Suppression Strategy Based on Virtual Impedance and Repetitive Controller for Modular Multilevel Converter Upper and Lower Bridge Arm Capacitance Parameter Asymmetry Conditions

Yao

Zhao

et al. 2023

WEVJ

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In recent years, modular multilevel converters (MMCs) have been increasingly used in the field of electric vehicle charging and discharging due to their unique performance advantages. However, the unique cascade structure of MMCs raises the problem of the circulating current. Due to chemical processes, aging effects, etc., the capacitance parameters of the upper and lower bridge arms will be asymmetric, which will introduce odd harmonics into the circulating current, increasing system losses and threatening the system reliability. To address this phenomenon, this paper proposes a circulating current suppression strategy with additional virtual impedance (VI) based on a repetitive controller (RC). The corresponding simulation models were built for the comparative study of different circulating current suppression strategies. The results show that the VI-RC circulating current suppression strategy can significantly reduce the odd and even harmonics in the circulating current under asymmetric conditions, and the total harmonic distortion (THD) of the bridge arm current is only 0.98%, which verifies the effectiveness of the proposed strategy.

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Section: Additional Virtual Impedance Designmentioning

confidence: 99%

Circulating Current Suppression Strategy Based on Virtual Impedance and Repetitive Controller for Modular Multilevel Converter Upper and Lower Bridge Arm Capacitance Parameter Asymmetry Conditions

Yao

Zhao

et al. 2023

WEVJ

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“…Electric vehicles have been widely used because they reduce the use of fossil energy and are conducive to achieving the dual-carbon goal [1][2][3]. Due to the intermittency of photovoltaic and wind power generation, the voltage on the AC side of the grid fluctuates greatly [4][5][6][7], resulting in voltage disturbance on the DC side of the charging pile, which threatens the charging safety of electric vehicles [8][9][10][11]. The dual active bridge DC-DC converter (DAB) is a key device for electric vehicle charging piles, which has the advantages of high power density, high efficiency, bidirectional energy transmission and easy cascade and parallel connection [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Model predictive control strategy based on Kalman filter for dual active bridge converter

Yan,

Hua,

Xun

et al. 2024

IEICE Electron. Express

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With the widespread use of electric vehicles, the large disturbance caused by the uncertainty of the AC side of the power grid will adversely affect the voltage stability of the DC side of the charging pile, which will threaten the charging safety of electric vehicles. In order to achieve fast and adaptive DC voltage regulation under large disturbance, this paper proposes a dual active bridge (DAB) converter control strategy based on Kalman Filter (KF) and Model Predictive Control (MPC). The improved Euler method is used to obtain a more accurate DAB discrete model, and the MPC control system is designed to improve the control accuracy. The best observation results of KF are used as feedforward compensation to improve the accuracy of output voltage regulation and ensure the stability of electric vehicles in the face of various disturbance problems. Finally, the effectiveness of the control strategy is verified by experiment.

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“…However, it limited by the development of power electronic semiconductor devices, single converter is difficult to meet the application requirements of high-voltage and large capacity. The DCSST based on multiple modules becomes the inevitable development trend in the future [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

High‐frequency‐link DC solid state transformer based on voltage self‐balancing control for MVDC power distribution application

Wang

Chen

Tong

et al. 2021

IET Power Electronics

Self Cite

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This paper presents a novel voltage self-balancing converter (VBC) applied to DC solidstate transformer (DCSST), analyzes the operating principle of the proposed VBC, and proves the voltage balance performance. Based on this converter, a novel DCSST topology is proposed, which can be used in medium and low voltage DC distribution application, microgrid and medium and low voltage energy storage system. Compared with the previous work, under the same voltage level, it can effectively reduce the number of transformers and switches, reduce the voltage level of switches, and realize the soft switching of the VBC switches, so as to improve the system efficiency and power density, and then improve the system reliability. Meanwhile, the fault handling ability and fault tolerance ability of DCSST are improved, which makes DCSST more reliable when multiple isolated bi-directional DC/DC Converters (IBDC) are connected in series. In addition, with this topology, the input voltage self-balancing control strategy of the IBDC is not needed because of the voltage self-balancing characteristic of VBC, which simplifies the control complexity and greatly improves the control accuracy of the control system. Experimental results agree well with the accuracy and correctness of the proposed topology.

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Modular Circulating Current and Second Harmonic Current Suppression Strategy by Virtual Impedance for DC Solid-State Transformer

Cited by 12 publications

References 32 publications

Circulating Current Suppression Strategy Based on Virtual Impedance and Repetitive Controller for Modular Multilevel Converter Upper and Lower Bridge Arm Capacitance Parameter Asymmetry Conditions

Circulating Current Suppression Strategy Based on Virtual Impedance and Repetitive Controller for Modular Multilevel Converter Upper and Lower Bridge Arm Capacitance Parameter Asymmetry Conditions

Model predictive control strategy based on Kalman filter for dual active bridge converter

High‐frequency‐link DC solid state transformer based on voltage self‐balancing control for MVDC power distribution application

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