Abstract
System operation features such as grid size, changes in regional distribution of power grid, power grid structure and diversity in networks bring more complexity due to the electrical connections and integrity of the distributed networks. Problems in relay safety and identification of faults in distribution network are the key issues that require immediate solutions due to flaws in the existing relay protection methods. The current paper proposes a relay protection method based on a feeder segment switches in multilevel differential defense-oriented distribution network. A greedy algorithm is devised to set the positions of feeder switches for optimal utilization of energy. After considering the multiple benefits of using feeder switches in the distribution networks, the main feeder is segmented and is linked to contact switches to enhance safety and to reduce the overhead cost of multiple feeder switches. The positioning of feeder switches is determined using greedy algorithm. Main feeder switches of the distribution network select the load switches to meet the requirements of relay protection. In case of occurrence of fault in the distribution network branches, the corresponding sectional feeder switch will trip immediately and the fault will be removed before the resumption of feeder switch. A relay protection method is integrated in the proposed method to keep the distributed network free from faults. The empirical results prove the efficacy of the proposed method with respect to the safety of the relay station, cost saving, determination of faults and consumption of energy. The comparative study with the existing methods reveals that the proposed method has the maximum safety factor of relay protection for the multistage differential distribution network, i.e., about 97%. The proposed method has the least fault location error, it saves operational cost, and it consumes minimal energy as compared to other techniques.
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The research is supported by Key Project of the National Natural Science Foundation of China (51637005), Research on system Security Protection based on Multi-dimensional Information Fusion of Smart Grid, 2017/01-2021/12.
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Wang, Q. Feeder segment switch-based relay protection for a multilayer differential defense-oriented distribution network. Soft Comput 26, 4895–4904 (2022). https://doi.org/10.1007/s00500-021-06673-6
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DOI: https://doi.org/10.1007/s00500-021-06673-6