Adjustable inertia implemented by bidirectional power converter in hybrid AC/DC microgrid

Lv, Zhonghua; Zhang, Yong; Xia, Yanghong; Wei, Wei

doi:10.1049/iet-gtd.2020.0279

Cited by 16 publications

(10 citation statements)

References 33 publications

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“…Due to the reverse distribution of energy and load caused by natural resource endowment, alternating current/direct current (AC/DC) interconnection of power grid and large-scale transmission between regional power grids have become the inevitable choice for power grid development. 1,2 At present, conventional power cable insulation materials are difficult to apply simultaneously to AC and DC transmission systems. Therefore, it is necessary to research and develop a high-voltage power cable insulation suitable for AC and DC systems, which will significantly reduce the impact of different load forms on cable design.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graftable voltage stabilizer for enhancing insulation performance of crosslinked polyethylene

Ren

Deng

et al. 2022

J of Applied Polymer Sci

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With the popular application of alternating current/direct current (AC/DC) hybrid power grid, ultra-high-voltage (UHV) AC/DC cables of long-distance and largecapacity transmission systems have been strongly demanded. Voltage stabilizers are widely used to resist AC electrical tree of cross-linked polyethylene (XLPE) insulation materials, but poor compatibility with polymer matrix limited improvement of DC insulation performance. In this research, the maleic anhydride-modified 2,4-dihydroxybenzophenone as a novel voltage stabilizer 4-(4-benzoyl-3-hydroxyphenoxy)-4-oxobut-2-enoic acid (MDVS) was synthesized to improve the electrical properties of XLPE. The XLPE-g-MDVS with different contents of MDVS was prepared, and both AC electrical properties and DC electrical properties were tested.The results indicate that the modified XLPE retain the characteristic of voltage stabilizer to resist AC electrical tree and improve breakdown strength, and to exhibit excellent DC insulation performance in a wide temperature range. In the comparison with the pristine XLPE, the graft of MDVS can significantly suppress space charge accumulation and decrease DC conductivity. At 70 C, the maximum amount of space charge density of XLPE-g-1.2wt%MDVS is 56.2% lower than that of XLPE, and the DC conductivity decreases by nearly two orders of magnitude. Furthermore, the DC breakdown strength of XLPE-g-1.2wt%MDVS materials exhibit higher than that of the pristine XLPE. In addition to the self-excited energy dissipation of the voltage stabilizer, quantum chemical calculations demonstrated that the improvement of DC performance attributed to the deep traps introduced by MDVS.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graftable voltage stabilizer for enhancing insulation performance of crosslinked polyethylene

Ren

Deng

et al. 2022

J of Applied Polymer Sci

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“…As the key to the interface of the PV energy and grid, a smart inverter with high versatility (i.e. multiple sources and loads), high power density, high reliability, high efficiency and high flexibility in grid supporting is of interest in such applications [3,4]. In terms of PV system configurations, the prior-art hybrid converters typically have two structures, as shown in Figure 1, where one PV source is simultaneously converted to DC and AC power at multiple buses.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid transformerless PV converters with low leakage currents: Analysis and configuration

Tang

Yang

Wan

et al. 2021

IET Renewable Power Gen

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This paper proposes a hybrid transformerless photovoltaic (PV) converter with simultaneous AC and DC outputs. It is specifically suitable for residential PV systems due to its high efficiency, versatility and flexibility, while maintaining lower leakage currents. The proposed converter is configured by replacing the control switch of the boost converter with a transformerless voltage‐source inverter (VSI), enabling multiple outputs. In addition, a symmetrical boost inductor is adopted to clamp the common‐mode voltage as a constant, resulting in low leakage currents. To illustrate the configuration principle, a hybrid converter with a highly efficient and reliable inverter concept (HERIC) as the VSI is exemplified. Besides, the dedicated modulation scheme for the proposed converter is detailed to achieve low leakage currents, reactive power injection and high efficiency. Furthermore, as the shoot‐through state of inverter legs is allowable for the proposed converter, i.e. no need to add dead time, the reliability and power quality of the proposed converter can be improved. Simulations and experimental tests are performed on an example hybrid converter (with an HERIC as the VSI) to validate the analysis.

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“…A more straightforward consideration is the reconfiguration of classic two-bus system as shown in Figure 2.3. In [29,36], the DESs have been integrated to the dc subgrid whereas in [48] required and will be discussed in Section 2.3.…”

Section: Conventional Hybrid Ac/dc Microgridmentioning

confidence: 99%

Uniform control for bidirectional interlinking converters in islanded hybrid AC/DC microgrid

Wang¹

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I need to express my gratidude to my friends who help me during study and make it memorable. Special thanks go to Dr. Wang Chen for his encouragement and accompany. Special thanks go to Dr. Lin Pengfeng for his suggestions on paper writing and knowledge sharing on hybrid ac/dc microgrid control strategies. Special thanks go to Dr. Jiang Wentao for his suggestions on research and knowledge sharing on stability analysis and converter control strategies. Special thanks go to Dr. Tu Pengfei for his insightful suggestions on my Ph.D. study. Special thanks go to Mr. Shi Donghan for his help on the experiments. Special thanks go to Mr. Zhang Zhe for his help during my Ph.D study. Special thanks go to Dr. Dong Chaoyu for his hleps, especially knowledge sharing on stability analysis for system with communication delay. Special thanks go to Dr. Li Xiangke for his collaborations on research. At last , I would like to express my deepest gratitude to my parents. Their unconditional love, support and understanding make me a better and happy person. ix "In me the tiger sniffs the rose." -Siegfried Sassoon To my dear family, people I love and love me

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Adjustable inertia implemented by bidirectional power converter in hybrid AC/DC microgrid

Cited by 16 publications

References 33 publications

Graftable voltage stabilizer for enhancing insulation performance of crosslinked polyethylene

Graftable voltage stabilizer for enhancing insulation performance of crosslinked polyethylene

Hybrid transformerless PV converters with low leakage currents: Analysis and configuration

Uniform control for bidirectional interlinking converters in islanded hybrid AC/DC microgrid

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