The Last Circuit Breakers Identification in Hybrid AC/DC Power Grids Based on Improved Tarjan Algorithm

Zhang, Guangxiao; Tong, Xiaoyang

doi:10.1109/tpwrd.2020.2971664

Cited by 9 publications

(5 citation statements)

References 13 publications

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“…The relationship between the selection of Q value and recognition accuracy is shown in Figure 13. Too many templates will increase the calculation time, so the value range of Q is set to [1,10]. In this paper, 100 samples are taken for each loosening type, and images other than templates are taken as test sets.…”

Section: Analysis Of Recognition Results Of Saturable Reactor Core Lo...mentioning

confidence: 99%

“…High-voltage direct current (HVDC) transmission has many advantages such as long transmission distance, low loss, flexible operation mode, and so on [1][2][3]. The saturable reactor is the key equipment in the converter valve, which can limit the current change rate at the moment when the thyristor is turned on and restrain the reverse impulse voltage in the process of turning off to ensure the normal operation of the thyristor [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Amin [16] used the deep recurrent neural network to extract the characteristics of vibration time series, which achieves the effective prediction of transformer early interturn fault. To sum up, the existing methods based on vibration signal eigenvalue extraction and deep learning have achieved some results in mechanical fault diagnosis of power equipment, but there are still some problems if they are applied to saturable reactors: (1) The vibration spectrum of transformers and other equipment is usually distributed between 0 and 2 kHz, while the frequency spectrum of saturable reactor core vibration signal under pulse excitation is widely distributed and more complex, which aggravates the difficulty of effective feature extraction. (2) Traditional fault diagnosis methods often use too many characteristic quantities, while the sampling frequency of saturable reactor vibration signal is high, and a large amount of data will be collected every second, resulting in a long calculation time.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vibration detection method for core loosening degree of high‐voltage direct current converter valve saturable reactor based on variational mode decomposition‐symmetrized dot pattern and image matching

Liu

Lai

Liu

et al. 2022

IET Science Measure & Tech

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Saturable reactor is the key equipment in converter valves; it is important to evaluate the core condition. In this paper, a recognition model of saturable reactor core loosening based on variational mode decomposition (VMD)-symmetrized dot pattern (SDP) feature fusion images and scale-invariant feature transform (SIFT) was proposed. Firstly, the saturable reactor vibration test under high frequency pulse excitation was carried out, and the vibration signals in different core loosening degrees were collected. Secondly, the VMD algorithm was used to decompose the broadband vibration signal into multiple narrowband functions, which were used to reflect the characteristics of each frequency band. Thirdly, each function and the original signal were transformed by SDP, the generated spiral arms were fused into a new image, and the typical templates in different loosening degrees were selected. Finally, the improved SIFT algorithm was used to obtain the matching results between test sets and templates. The results show that the recognition accuracy of the proposed model for core loosening is 97.5%, which is better than traditional algorithms. It can find the core loosening defect early and avoid further failures such as water pipe break and discharge, which can provide an important basis for saturable reactor monitoring.

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Section: Analysis Of Recognition Results Of Saturable Reactor Core Lo...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vibration detection method for core loosening degree of high‐voltage direct current converter valve saturable reactor based on variational mode decomposition‐symmetrized dot pattern and image matching

Liu

Lai

Liu

et al. 2022

IET Science Measure & Tech

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show abstract

“…1) Updating Principle of Adjacency Matrix [14], [19]: The dynamic changes of the network structure or operating condition in a power grid affect the order of connection of the protected electrical component and circuit breaker, and it could potentially lead to unwanted tripping decisions in such situations. This requires the adjacency matrix to be updated in real-time to keep pace with the current network structure of the system.…”

Section: B Real-time Fault Isolation Setmentioning

confidence: 99%

“…The proposed scheme must determine whether the circuit breaker is an LCB before tripping a circuit breaker at the AC field in an HVDC inverter station. The process of LCB identification is not discussed here, and detailed information can be found in [19]. • For the power network with changeable flow direction.…”

Section: Tripping Strategymentioning

confidence: 99%

A Novel Fault Isolation Scheme in Power System With Dynamic Topology Using Wide-Area Information

Zhang

Tong

Hong

et al. 2022

IEEE Trans. Ind. Inf.

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The flexible and dynamic operation condition of the power system requires that the fault isolation scheme has sufficient adaptability. A novel fault isolation scheme based on wide-area information is proposed in this paper. Based on graph theory, the adjacency matrices of the electrical components and circuit breakers are constructed. The real-time switch status data is exploited to reflect the dynamic changes of the network topology. Then, the tripping path of the circuit breaker connecting each protected electrical component is searched by the Floyd-Warshall algorithm to formulate the fault isolation set for all protected electrical components. The proposed approach is applied to fault isolation from a wide-area perspective, and it is not affected by system coordination and selectivity compared with the one based on local information. The effectiveness of the proposed scheme is verified on a power system with the typical electrical connection under the cases of a single fault, multiple faults, circuit breaker failure, and substation with the outage of DC power supply, and the case where the circuit breakers cannot trip. Since the tripping sequence of the circuit breakers is determined before the fault occurs, even with dynamic changes of the power system conditions, the proposed scheme can minimize the fault isolation zone with low fault clearance time.

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A Self-adaptive Method for Identifying the Last Circuit Breakers in Hybrid AC/DC Power Grids

Zhang

Tong

Fan

et al. 2021

Proceedings of 2020 International Top-Level Forum on Engineering Science and Technology Development Strategy and the 5th PURPLE

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The Last Circuit Breakers Identification in Hybrid AC/DC Power Grids Based on Improved Tarjan Algorithm

Cited by 9 publications

References 13 publications

Vibration detection method for core loosening degree of high‐voltage direct current converter valve saturable reactor based on variational mode decomposition‐symmetrized dot pattern and image matching

Vibration detection method for core loosening degree of high‐voltage direct current converter valve saturable reactor based on variational mode decomposition‐symmetrized dot pattern and image matching

A Novel Fault Isolation Scheme in Power System With Dynamic Topology Using Wide-Area Information

A Self-adaptive Method for Identifying the Last Circuit Breakers in Hybrid AC/DC Power Grids

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