Transformer‐less dynamic voltage restorer based on a three‐leg ac/ac converter

Zhou, Min; Sun, Yao; Su, Mei; Li, Xing; Lin, Jianheng; Liang, Jian; Liu, Yonglu

doi:10.1049/iet-pel.2018.5396

Cited by 24 publications

(17 citation statements)

References 27 publications

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“…Substitute the Equations (6) and 7into (8), then Taking the classical presag compensation strategy of DVR as an example, the corresponding conditions for the secondary current drop, secondary current rise, or keeping current constant for adjacent load are deduced, as follows.…”

Section: Angle Of the mentioning

confidence: 99%

“…A new compensation strategy that is based on the combination of minimum energy compensation method and the longest compensation duration method is proposed [17]. The simulation results prove that this compensation strategy can provide compensation of a longer time The main aspects in the research field of DVR include the DVR topology [6][7][8], the location of the output filter capacitance [9], the series transformer's capacity [10], the control strategies [11,12], the voltage detection methods [13], and the compensation strategies [14]. The studies about the DVR control strategies [11,12] mainly focus on how to improve DVR dynamic performance and harmonic control.…”

Section: Introductionmentioning

confidence: 99%

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Influence of DVR on Adjacent Load and Its Compensation Strategy Design Based on Externality Theory

et al. 2019

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Dynamic voltage restorer (DVR) is a compensation device that can effectively improve power quality, and it is widely used to compensate the voltage sag on sensitive loads. However, DVR will affect the operation of the sensitive loads in parallel at the same busbar (such parallel are defined as adjacent loads) in the process of improving sensitive load voltage quality. With the externality theory, this paper proposes a solution to clarify the influence of DVR on the adjacent load and handle the possible controversy. This paper first establishes a simple system that consists of a DVR, sensitive loads, and adjacent loads. Based on the equivalent network, the influence of the DVR on the adjacent load is analyzed in terms of voltage change and power consumed. The externality boundaries are clearly defined when considering network parameters in order to fairly deal with the interaction of multi entities. Afterwards, an optimization compensation strategy that is based on externality theory is proposed. Finally, the simulation on compensation strategy is tested on the MATLAB/Simulink platform to demonstrate the feasibility and effectiveness of the proposed method.

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Section: Angle Of the mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of DVR on Adjacent Load and Its Compensation Strategy Design Based on Externality Theory

et al. 2019

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“…A lot of power electronic devices have been adopted to improve PQ. Generally, an active power filter (APF) is used to handle the current-related PQ problems, while dynamic voltage restorer (DVR) is preferred to tackle the voltage-related PQ problems [4,5]. Unified PQ conditioner (UPQC), as the integration of an APF and a DVR sharing a common dc-link [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], can deal with both current and voltage-type of PQ issues, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Transformer‐less single‐phase unified power quality conditioner of no circulating current

Zhou

Liu

et al. 2020

IET Power Electronics

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This study presents a unified current-source power quality conditioner of inherent no circulating current. It is formed of a three-leg current-source ac/ac converter and a specially designed small size dc-link. Owing to the transformers-less feature and small size dc-link, the proposed topology has the benefit of high power density. In addition, without the need to address the circulating current issue, it is easier to design the controllers and filters for the circulating current compared to other existing transformer-less unified power quality conditioners. To handle the harmonic currents compensation, voltage sags/swells elimination, power factor correction simultaneously and achieve excellent dynamic and steady-state performance, a direct control method based on an extended repetitive disturbance observer is proposed. Detailed analysis of topology and operation principles is given, followed by the modulation scheme and the developed control method. Simulations and experimental results are presented to verify the effectiveness of the conditioner.

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“…Therefore, to eliminate the injection transformers from DVR topology, some studies are carried out. A transformerless single-phase DVR is suggested for low-voltage (LV) level in [6][7][8][9]. Owing to the single-phase operation, the isolation requirement between the series converters is eliminated and transformerless topology is performed in the proposed systems.…”

Section: Introductionmentioning

confidence: 99%

Isolated H‐bridge DC–DC converter integrated transformerless DVR for power quality improvement

Savrun¹,

Köroğlu²,

Tan

et al. 2020

IET Power Electronics

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This study presents a new H-bridge DC-DC converter-based transformerless dynamic voltage restorer topology (DVR). The proposed system can compensate balanced and unbalanced voltage sag/swell that are the most common electrical power quality problems and offers advantages over conventional DVR topologies by providing the isolation with high-frequency transformer (HFT) rather than bulky injection transformers and by employing shunt converter to eliminate the requirement of an energy storage unit. The system is composed of H-bridge DC-DC converter equipped with a HFT with one primary and three secondary windings and transformerless DVR. The single-phase shift modulation method is used for each series converter independently to provide the bidirectional power flow control of DC-DC converter, whereas in-phase compensation method with a hybrid detection algorithm is used to mitigate voltage sag/swell. An LC filter is employed to attenuate the switching ripple harmonics on the output of the DVR. The performance of the proposed system is verified experimentally on a three-phase, three-wire, 380 V, 10 kVA prototype.

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Transformer‐less dynamic voltage restorer based on a three‐leg ac/ac converter

Cited by 24 publications

References 27 publications

Influence of DVR on Adjacent Load and Its Compensation Strategy Design Based on Externality Theory

Influence of DVR on Adjacent Load and Its Compensation Strategy Design Based on Externality Theory

Transformer‐less single‐phase unified power quality conditioner of no circulating current

Isolated H‐bridge DC–DC converter integrated transformerless DVR for power quality improvement

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