Investigation of interconnecting two Chinese LCC-HVDC through LCL DC/DC converter

Lin, Weixing; Jovcic, Dragan; Yao, Liangzhong; Sun, Wei; Lu, Xiaojun; Wen, Jinyu

doi:10.1109/appeec.2015.7380987

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…3) LCC DC GRIDS USING DC/DC TRANSFORMERS The above section does not consider the employment of DC/DC transformers to interconnect LCC HVDC links with different DC voltage levels. References [14]- [16] use an MMC based DC/DC transformer to connect two existing LCC-HVDC links to form an MTDC network, as shown in Figure 3. The interconnected system using DC/DC transformer enables the interconnection of existing HVDC links with different voltage levels.…”

Section: ) Parallel Architecturementioning

confidence: 99%

“…Therefore, the impact of losing an LCC terminal or DC faults on system operation can be mitigated. The proposed methods in the references [14]- [16] are suitable for the LCC-HVDC links whose geographic locations are close to each other.…”

Section: ) Parallel Architecturementioning

confidence: 99%

“…The failure rates of the capacitor, SM control system and power supply system were assumed to be 0.001752 occ/year, 0.03 occ/year and 0.03504 occ/year [37]. The reliability indices of the MMC, the MTTF and failure rate, are calculated using (14) and (15) respectively. The calculated MTTF is 3.03 year.…”

Section: Reliability Model Of Mmcs For Uhvdc Applicationsmentioning

confidence: 99%

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Feasibility and Reliability Analysis of LCC DC Grids and LCC/VSC Hybrid DC Grids

Liang

Joseph

et al. 2019

IEEE Access

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Power system interconnections using high-voltage direct-current (HVDC) technologies between different areas can be an effective solution to enhance system efficiency and reliability. Particularly, the multi-terminal dc grids that could balance and ensure resource adequacy increase asset utilization and reduce costs. In this paper, the technical feasibility of building dc grids using the line-commutated converterbased (LCC) and voltage source converter-based (VSC) HVDC technologies is discussed. Apart from presenting the technical challenges of building LCC dc grids and LCC/VSC hybrid dc grids, the reliability modeling and analysis of these DC grids are also presented. First, the detailed reliability model of the modular multi-level converters (MMCs) with series-connected high-voltage and low-voltage bridges is developed. The active mode of redundancy design is considered for the reliability model. To this end, a comprehensive whole system reliability model of the studied systems is developed. The reliability model of each subsystem is modeled in detail. Various reliability indices are calculated using this whole system reliability model. The impacts of the redundancy design of the MMCs on these indices are presented. The studies of this paper provide useful guidance for dc grid design and reliability analysis. INDEX TERMS LCC-HVDC, VSC-HVDC, MMC, multi-terminal dc grid, reliability analysis, k-out-of-n.

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Section: ) Parallel Architecturementioning

confidence: 99%

Section: ) Parallel Architecturementioning

confidence: 99%

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Feasibility and Reliability Analysis of LCC DC Grids and LCC/VSC Hybrid DC Grids

Liang

Joseph

et al. 2019

IEEE Access

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“…The technological evolution in terms of rated power and DC voltage has since been impressive. Some installations of modern HVDC based on VSC technology reach 1.8 GW with a rated voltage of ±500 kV [43,44] while some traditional HVDC units based on thyristors go up to 8 GW and ±800 kV [45,46]. HVDC has also been used to evacuate the active power of large off-shore wind power plants to the transmission system due to the reduced capability of long AC submarine cables [47,48].…”

Section: Hybrid Ac/dc Networkmentioning

confidence: 99%

Ancillary Services in Hybrid AC/DC Low Voltage Distribution Networks

et al. 2019

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In the last decade, distribution systems are experiencing a drastic transformation with the advent of new technologies. In fact, distribution networks are no longer passive systems, considering the current integration rates of new agents such as distributed generation, electrical vehicles and energy storage, which are greatly influencing the way these systems are operated. In addition, the intrinsic DC nature of these components, interfaced to the AC system through power electronics converters, is unlocking the possibility for new distribution topologies based on AC/DC networks. This paper analyzes the evolution of AC distribution systems, the advantages of AC/DC hybrid arrangements and the active role that the new distributed agents may play in the upcoming decarbonized paradigm by providing different ancillary services.

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“…Recent developments show that this technology is currently limited to 1.8 GW and ±500 kV [69,70]. However, conventional HVDC installations based on thyristors are rated up to 8 GW and ±800 kV [71,72]. Other technological issue requiring more attention in the next years is the development of simpler and more effective HVDC circuit breakers [73,74].…”

Section: Future Trends and Major Challengesmentioning

confidence: 99%

Overview of power electronics technology and applications in power generation transmission and distribution

Ortega

Acha

García

et al. 2017

J. Mod. Power Syst. Clean Energy

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The main objective of this paper is three-fold. First, to provide an overview of the current status of the power electronics technology, one of the key actors in the upcoming smart grid paradigm enabling maximum power throughputs and near-instantaneous control of voltages and currents in all links of the power system chain. Second, to provide a bridge between the power systems and the power electronic communities, in terms of their differing appreciation of how these devices perform when connected to the power grid. Third, to discuss on the role that the power electronics technology will play in supporting the aims and objectives of future decarbonized power systems. This paper merges the equipment, control techniques and methods used in flexible alternating current transmission systems (FACTS) and high voltage direct transmission (HVDC) equipment to enable a single, coherent approach to address a specific power system problem, using 'best of breed' solutions bearing in mind technical, economic and environmental issues.

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Investigation of interconnecting two Chinese LCC-HVDC through LCL DC/DC converter

Cited by 6 publications

References 7 publications

Feasibility and Reliability Analysis of LCC DC Grids and LCC/VSC Hybrid DC Grids

Feasibility and Reliability Analysis of LCC DC Grids and LCC/VSC Hybrid DC Grids

Ancillary Services in Hybrid AC/DC Low Voltage Distribution Networks

Overview of power electronics technology and applications in power generation transmission and distribution

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