Control Characteristic Analysis and Coordinated Strategy Design for Hybrid HVDC With Multi-Infeed MMC Inverters

Zhao, Jingbo; Yan, Tie

doi:10.3389/fenrg.2021.737294

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…The DC voltage is a function of the AC line-to-line voltage; hence, a decrease in the AC voltage caused by a fault results in a drop in the DC voltage. Figure 4 depicts the HVDC LCC characteristic curves under AC fault conditions [43]. As shown in this figure, the current is regulated by a voltage-dependent current order limit (VDCOL), which is used to limit the reactive power demand from the AC system during the fault and hence minimizes the danger of commutation failure.…”

Section: Ac Faultsmentioning

confidence: 99%

Improvement of the Iraqi Super Grid Performance Using HVDC/HVAC Links by the Integration of Large-Scale Renewable Energy Sources

2022

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The increasing use of renewable energy sources (RES) and their integration into transmission systems requires extensive studies to get more benefits from these sources. Stability analysis is one of the most crucial issues in these systems, and therefore needs to be studied in depth. In this paper, an analytical study was conducted for the stability assessment of the Iraqi super grid after adding a solar power plant with a capacity of 1000 MW using both HVAC and HVDC links for comparison purposes. Thus, the objective of this study was to determine the best way to integrate RES into the power grid while improving its performance. The system’s stability was evaluated for two types of faults: line and bus disturbances. The strength of the grid and its ability to absorb the newly added energy was also studied. The simulations were performed with the PSS/E software using the Newton-Raphson method for a 500 km transmission line length. The results showed that the HVDC link outperforms the HVAC link in improving the overall performance of the power system.

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Section: Ac Faultsmentioning

confidence: 99%

Improvement of the Iraqi Super Grid Performance Using HVDC/HVAC Links by the Integration of Large-Scale Renewable Energy Sources

2022

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“…LCC-HVDC power transmission technology has the advantages of large transmission capacity, a high voltage level, low manufacturing cost, and high reliability (Kwon et al, 2018;Chen et al, 2022), making it widely used in large-capacity and long-distance power transmission systems. VSC-HVDC power transmission technology (Flourentzou et al, 2009;Wang R. et al, 2020;Zhao and Tao, 2021;Xu et al, 2023) has advantages of flexible control and easy power flow reversal, making it more advantageous in the fields of large-scale renewable energy integration , passive grid power supply, and multi-terminal HVDC transmission (Rao et al, 2019;Li et al, 2021a;Li et al, 2021b;Li et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Planning and Operation Strategies for Enhancing Power System Flexibility in Low-Carbon Energy Transition

2024

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Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

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“…Related scholars have studied hybrid cascaded HVDC systems using this topology. A coordinated control strategy based on the dynamic limiter, diodes and LCC-MMC active orders is proposed was suggested to improve the AC side voltage stability (Zhao and Tao, 2021). A supplementary coupling mitigation control strategy was suggested to enhance the stability of a hybrid cascaded HVDC system connected to a weak grid (He et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Study on the characteristic of the grounding fault on the cascaded midpoint side of the hybrid cascaded HVDC system

et al. 2023

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The hybrid cascaded high-voltage direct current (HVDC) system combines the system support capabilities of the modular multilevel converter (MMC) with the capacity of the line-mutated converter’s (LCC’s) advantage of high-power transmission. The HVDC system is among the key elements of a smart grid where artificial intelligence is applied extensively. However, the characteristics of a grounding fault on the cascaded midpoint side of a hybrid cascaded HVDC system remain unclear. This study analyzes fault characteristics and the impact of faults using analytical methods. First, the topology and basic control strategy are presented. The fault response process is then analyzed by dividing systems into the MMC and LCC parts at the inverter side. A separate theoretical analysis is also conducted. In addition, the impacts of faults on HVDC and alternating current (AC) networks are analyzed. Therefore, even after the HVDC system is disabled, the AC network can supply fault currents using an antiparallel diode. The simulation results show that the proposed analysis method is feasible, and the theoretical analysis is correct. The proposed method can provide a theoretical basis for the selection of equipment for HVDC systems and smart grid construction.

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Control Characteristic Analysis and Coordinated Strategy Design for Hybrid HVDC With Multi-Infeed MMC Inverters

Cited by 5 publications

References 22 publications

Improvement of the Iraqi Super Grid Performance Using HVDC/HVAC Links by the Integration of Large-Scale Renewable Energy Sources

Improvement of the Iraqi Super Grid Performance Using HVDC/HVAC Links by the Integration of Large-Scale Renewable Energy Sources

Planning and Operation Strategies for Enhancing Power System Flexibility in Low-Carbon Energy Transition

Study on the characteristic of the grounding fault on the cascaded midpoint side of the hybrid cascaded HVDC system

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