Feasibility of DC transmission networks

Jovcic, Dragan; Hertem, Dirk Van; Lindén, Kerstin; Taisne, Jean-Pierre; Grieshaber, W.

doi:10.1109/isgteurope.2011.6162829

Cited by 159 publications

(98 citation statements)

References 9 publications

(7 reference statements)

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“…and to, establish a wide-area intelligent transmission network. The aims of this proposal are to realize the power fluctuation suppression of renewable distribution generations in a wide-area range and large-scale efficient integration of renewable energy sources, guarantee the safe and stable operation of the power grids, improve the power supply quality, promote the harmonious development of renewable energy sources and power system and so on [31][32][33]. China can also construct DC grids based on the largescale offshore wind farms in the future.…”

Section: ) Concepts Of Multi-terminal DC and Dc Gridmentioning

confidence: 99%

R&D and application of voltage sourced converter based high voltage direct current engineering technology in China

Tang

Pang

2014

J. Mod. Power Syst. Clean Energy

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As a new generation of direct current (DC) transmission technology, voltage sourced converter (VSC) based high voltage direct current (HVDC) has been widely developed and applied all over the world. China has also carried out a deep technical research and engineering application in this area, and at present, it has been stepped into a fast growing period. This paper gives a general review over China's VSC based HVDC in terms of engineering technology, application and future development. It comprehensively analyzes the technical difficulties and future development orientation on the aspects of the main configurations of VSC based HVDC system, topological structures of converters, control and protection technologies, flexible DC cables, converter valve tests, etc. It introduces the applicable fields and current status of China's VSC based HVDC projects, and analyzes the application trends of VSC based HVDC projects both in China and all over the world according to the development characteristics and demands of future power grids.

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Section: ) Concepts Of Multi-terminal DC and Dc Gridmentioning

confidence: 99%

R&D and application of voltage sourced converter based high voltage direct current engineering technology in China

Tang

Pang

2014

J. Mod. Power Syst. Clean Energy

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“…7. Meanwhile, a topology [20] that can be realized by cutting off the DC fault cables at high voltages and power levels has been proposed by ABB, as Fig. 8 shows.…”

Section: Hybrid DC Breakersmentioning

confidence: 99%

Research on fast solid state DC breaker based on a natural current zero-crossing point

Xiang

Hua

Wen

et al. 2014

J. Mod. Power Syst. Clean Energy

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The DC fault characteristics of voltage source converter based high voltage direct current (VSC-HVDC) systems are analyzed in this paper. The phenomenon whereby the capacitor on DC side discharges quickly during a DC fault contributes to a large short-circuit fault current. Neither traditional DC breakers nor DC switches can cut off the fault current under this condition. A fast solid state DC breaker design method is proposed in this paper. This method is based on the fault current characteristics of the inverter in multi-terminal HVDC systems (MTDC), where a fault current appears at the natural zerocrossing point near the inverter. At this point, by coordinating the AC breakers near the rectifier, the DC breaker could reliably cut off the DC fault current and protect the system. A detailed model for this fast solid state DC breaker and its operation sequence are studied, based on this design method. Simulations modeling a five-terminal meshed DC grid and a fast DC breaker were carried out with PSCAD/EMTDC using this design method. The results from the simulations confirmed the validity of the design method.

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“…Most important advantages of DC grids for offshore wind farm are low power losses and small size cable for carrying large amounts of power over long distances [1,2]. Using 3DAB conversion system, furthermore, a bulky 50/60Hz transformer can be replaced by MF transformer operating at the kilo-hertz range, resulting in considerable reduction in transformer weight/size.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of a High-Power Transformer for Three-Phase Dual Active Bridge DC-DC Converter for MVDC Grids

Lee¹,

Vakil²,

Feldman³

et al. 2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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High-power DC-DC converter will be one of the essential technologies for the future DC grids. Especially, a three-phase dual-active bridge DC-DC (3DAB) Converter is highly suitable for high-power DC systems. Key component within this converter is the high power transformer operated at a medium frequency (MF) range. The design and optimization of this key component is presented in this paper. The transformer provides galvanic isolation from low voltage level to medium level or high voltage level and provides stepping up or down of the output (secondary) voltage. At first, a design of three-phase medium frequency transformer is developed. The designed transformer is then validated using two-dimensional (2D) transient finite element analysis (FEA) and performance under the non-sinusoidal excitation is determined. After that, the optimization is carried out, for the set of selected design variables, in order to enhance the power density and efficiency of the targeted transformer. Finally, the performance of the full system, 3DAB converter, is determined using the parameters of optimized transformer. Also, two different rated input voltages for 4MW/1kHz threephase transformer are considered and analysed in this paper.

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Feasibility of DC transmission networks

Cited by 159 publications

References 9 publications

R&D and application of voltage sourced converter based high voltage direct current engineering technology in China

R&D and application of voltage sourced converter based high voltage direct current engineering technology in China

Research on fast solid state DC breaker based on a natural current zero-crossing point

Design Optimization of a High-Power Transformer for Three-Phase Dual Active Bridge DC-DC Converter for MVDC Grids

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