An Ideal DC Transformer for Active DC Distribution Networks Based on Constant-Transformation-Ratio DABC

Wang, Xiaoming; Peng, Yonggang; Chai, Junwei; Xia, Yanghong; Wei, Wei; Yu, Miao

doi:10.1109/tpel.2019.2922402

Cited by 13 publications

(8 citation statements)

References 32 publications

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“…Similarly, when the phase shift angle operates in the range (−π, −π/2), the power transferred by DAB i,j is equal to the power transferred when the angle is −π − θ ij . According to Wang et al (2020), when the phase shift angle θ ij exceeds the interval (−π/2, π/2), the increase in the absolute value of the angle does not lead to an increase in the transmission power, but the RMS current of the switches still increases, and the power loss also increases. To avoid unnecessary power loss, the phase shift angles are limited to the interval (−π/2, π/2) in this study.…”

Section: Control Framework Of Dual Active Bridgementioning

confidence: 99%

A unified decentralized framework for isolated interlinking converters of hybrid DC/AC microgrids

Yang²,

Peng³

et al. 2023

Front. Energy Res.

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Due to the advantages of effectively integrating diversified loads and renewable sources, hybrid DC/AC microgrids have attracted the common attention of industry and academia. Meanwhile, with the increasing number of power electronic devices connected to the system, the complexity of the system increases, which puts forward higher requirements for galvanic isolation and intelligent control methods. This study proposes a unified decentralized framework for isolated interlinking converters (IICs) in hybrid DC/AC microgrids, which include topology and a control strategy to solve the aforementioned problems. Firstly, in terms of topology, a dual active bridge (DAB) converter is adopted to realize galvanic isolation and DC voltage conversion, which can facilitate the interconnection of DC microgrids or be combined with VSC for the interconnection of DC and AC microgrids. Secondly, in terms of the control strategy, a bidirectional voltage–supporting control strategy is proposed for IICs, in which the frequency and voltage are adopted as the indications to balance the power and strengthen the inertia interaction of microgrids. Furthermore, with the proposed control strategy, the voltage sources of different microgrids can share the power fluctuation, cooperatively. The stability of the proposed strategy is analyzed, and the effectiveness is verified by several HIL experiments.

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Section: Control Framework Of Dual Active Bridgementioning

confidence: 99%

A unified decentralized framework for isolated interlinking converters of hybrid DC/AC microgrids

Yang²,

Peng³

et al. 2023

Front. Energy Res.

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“…To control the voltage ratio r of DABC, the corresponding system dynamic should be analyzed. State space models of the voltages in the primary and secondary side are as follows [21].…”

Section: Constant Ratio Control Of Dabcmentioning

confidence: 99%

“…The stability analysis about DABC part based on constant transformation ratio method has been conducted in [21], thus this section mainly analyzes the stability of the power-sharing control method of BIC part. The range of key parameters can be verified by the analysis.…”

Section: Stability Analysismentioning

confidence: 99%

“…To control the voltage ratio r of DABC, the corresponding system dynamic should be analyzed. State space models of the voltages in the primary and secondary side are as follows [21].

({, \begin{matrix} 0true C_{1} \frac{d v_{d c}}{d t} = i_{d c} - \frac{n v_{d c - m} θ ((), π - (||, Θ))}{2 π^{2} f_{s} L} \\ 0true C_{2} \frac{d v_{d c - m}}{d t} = \frac{n v_{d c} θ ((), π - (||, Θ))}{2 π^{2} f_{s} L} - i_{d c - m} \end{matrix})

The corresponding small signal models are as follows.…”

Section: Seamless Switching Power Sharing Controlmentioning

confidence: 99%

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Seamless switching power sharing control method in a hybrid DC‐AC microgrid by the isolated two‐stage converter based on SST

Peng

Wang

2021

IET Power Electronics

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To facilitate the application of various renewable generations as well as diversified loads, hybrid DC/AC microgrids have aroused widespread interest; however, direct access of different types of sources and loads to the utility through multiple converters may be inefficient. In addition, with the complexity growth of the system, the stable and efficient operation puts forward new requirements for the isolation protection and more intelligent control. Facing these problems, the isolated two-stage converter topology based on solid state transformer (SST) is designed and the automatic seamless switching power sharing control strategy is proposed. The proposed topology replaces the conventional passive transformer with dual-active-bridge converter (DABC) to realize voltage matching and galvanic isolation for higher controllability and less volume occupation. Constant ratio control method is adopted for DABC to operate as an ideal DC transformer. Further, AC frequency and DC voltage are measured as characterizations of power level to adjust the transferred power of the converter. Through the non-directional strategy, bidirectional power support and decentralized cooperation are realized, and the capacity and sensitivity of microgrids are considered. The stability of the proposed control strategy is analyzed and the feasibility is verified by several real-time hardware-in-loop experiments.

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“…The advancement of low-carbon technology strains the reliability, energy quality, and lifespan of existing electric networks. As a result, network upgrades, advanced monitoring, and control technologies are being developed to increase the performance of the electric grid and, consequently, to increase the use of renewable energy sources [4]. The intelligent transformer (ST) is a power electronics system with enhanced control and communication capabilities that represent a viable solution to the abovementioned challenges.…”

Section: Introductionmentioning

confidence: 99%

Multi-port DC-DC converter modelling

Arizaga-Ayala¹,

Ramirez²

2022

Preprint

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This paper is focused on bidirectional DC-DC converters in renewable energy systems. It discusses a triple active bridge (TAB) converter, including how to model, control, and simulate it. First, Kirchhoff's principles are used to identify the equations governing the converter's behaviour and then construct the system model. Next, the control system was developed using the plant's state-space representation. The closed-loop model Laplace transform and some simulator data provide the control technique. Finally, the simulator tools evaluate the system's stability and behaviour before and after management. The results show that the active converter may be used with renewable energy.

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An Ideal DC Transformer for Active DC Distribution Networks Based on Constant-Transformation-Ratio DABC

Cited by 13 publications

References 32 publications

A unified decentralized framework for isolated interlinking converters of hybrid DC/AC microgrids

A unified decentralized framework for isolated interlinking converters of hybrid DC/AC microgrids

Seamless switching power sharing control method in a hybrid DC‐AC microgrid by the isolated two‐stage converter based on SST

Multi-port DC-DC converter modelling

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