Differential current integral based bipolar short-circuit protection method for DC distribution network with blocking converters

Li, Botong; Yang, Xinlu; Li, Bin; Wen, Weijie; Chen, Xiaolong; Su, Jiang

doi:10.1016/j.epsr.2020.106977

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…The algorithm in [23] detects and identifies the fault type through the differential current integration. As in the solution proposed in [16], numerical derivatives may be affected depending on the sampled noise levels.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Time Warping Based Pilot Protection Algorithm for AC and HVDC Transmission Lines

Manassero

Tiferes

2023

IEEE Access

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This paper presents a pilot protection algorithm for alternating (ac) and direct current (dc) transmission lines, the last in the line commutated converter and voltage source converter topologies. The main contribution of this research lies, in this context, in the development of a protection method for lines of different natures. This method relies on the dynamic time warping (DTW) technique. The solution is attractive as it does not require any line or system parameters and works only with current samples. For ac lines, the algorithm uses DTW to evaluate the line terminals phase currents' and the zero-sequence components' similarities and detect faults. In turn, for dc lines, the method employs DTW technique to evaluate the similarities of cross-currents between poles and terminals and identify internal dc faults. The authors tested the algorithm for each line topology through several fault simulations, also considering the challenging conditions of high impedance internal faults, sampled noises, misalignment between samples, current transformer saturation, power swing, and internal fault with outfeed. This solution was also tested against field-recorded data in existing lines, and the resulting trip times were compared with the ones of the actual protection devices. All results indicate that this solution yields a rapid, effective, secure, and dependable protection.INDEX TERMS Power transmission lines, line commutated converter, voltage source converter, pilot protection, dynamic time warping.

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Section: Introductionmentioning

confidence: 99%

Dynamic Time Warping Based Pilot Protection Algorithm for AC and HVDC Transmission Lines

Manassero

Tiferes

2023

IEEE Access

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“…The converter valve's primary protection mechanism fails to identify the fault area, owing to the similarities in electrical quantities between internal and external faults. When commutation failures occur, the converter protection system may exhibit unexpected action behavior and is affected by many factors, resulting in a decrease in the sensitivity and speed of protection [3], [4], [5]. Commutation failure causes a three-phase valve current imbalance, resulting in certain converter valves overheating [6], [7].…”

Section: Introductionmentioning

confidence: 99%

A Location Method for AC Fault in LCC-HVDC System Based on Virtual Conduction Width Characteristics

Yin

2023

IEEE Access

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When an AC fault occurs in HVDC transmission system, the transient response change in the rate of change of current and voltage, which may lead to the unexpected action behavior of converter protection. This is attributed to the electrical quantity similarities between internal and external faults, leading to difficulties in fault location identification and reducing the sensitivity in protection measure activation. To realize internal and external fault identification and quickly deal with external faults, an AC fault detection method for LCC-HVDC systems based on virtual conduction width characteristics is proposed. First, by utilizing the ratio integral of the three-phase AC current on the valve side to the reference current, the virtual conduction width flowing through each valve in the sampling window is calculated. Second, according to the size relationship among virtual conduction widths, internal and external faults are identified. Third, after determining the external faults, the difference in the virtual conduction width for each valve branch in the sampling window is calculated to locate the fault phase. Finally, the simulation results based on EMTDC/PSCAD show that the proposed method can quickly identify internal and external faults and locate fault phases and is not affected by fault moment and fault resistance.

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“…In the paper 11 , the direct current voltage is kept stable when the input voltage depth falls; In literature 12 , power routers are used to optimize the distribution network and effectively isolate the disturbance. Aiming at OPEN 1 State Grid Information and Telecommunication Co., Ltd., Beijing 102211, China.…”

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confidence: 99%

Research on the control strategy of DC microgrids with distributed energy storage

Li,

Zhao,

Zhuang

et al. 2023

Sci Rep

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As a supplement to large power grids, DC microgrids with new energy access are increasingly widely used. However, with the increasing proportion of new energy in DC microgrids, its output fluctuations directly affect the overall stability of the microgrids. Distributed energy storage can smooth the output fluctuation of distributed new energy. In this paper, an AC-DC hybrid micro-grid operation topology with distributed new energy and distributed energy storage system access is designed, and on this basis, a coordinated control strategy of a micro-grid system based on distributed energy storage is proposed. To maintain the voltage stability of the DC bus and make each station have the power-sharing ability, the AC/DC flexibly interconnected converter should adopt two control strategies. The power can flow bidirectional in the power scheduling and distribution of the energy storage station; At the same time, different power distribution schemes will generate different scheduling costs. To optimize the operation of energy storage power stations, an improved particle swarm optimization algorithm is adopted in this paper to optimize the scheduling task allocation scheme. The optimization objective is the lowest scheduling cost, to realize the optimal scheduling of energy storage power stations. In this paper, based on a Matlab/Simulink environment, a microgrid system based on an AC-DC hybrid bus is built. The simulation results verify the effectiveness of the proposed microgrid coordinated control strategy.

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Differential current integral based bipolar short-circuit protection method for DC distribution network with blocking converters

Cited by 6 publications

References 11 publications

Dynamic Time Warping Based Pilot Protection Algorithm for AC and HVDC Transmission Lines

Dynamic Time Warping Based Pilot Protection Algorithm for AC and HVDC Transmission Lines

A Location Method for AC Fault in LCC-HVDC System Based on Virtual Conduction Width Characteristics

Research on the control strategy of DC microgrids with distributed energy storage

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