Open AccessOptimal placement of grounding small resistance in neutral point for restraining voltage fluctuation in power grid caused by geomagnetic storm
Author(s) -
Yang PeiHong,
Li Ya,
Liu LianGuang,
Dong XiaoLing,
Zhang JianJun
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.6310
Subject(s) - geomagnetically induced current , transformer , voltage , control theory (sociology) , electrical engineering , ac power , geomagnetic storm , ground , grid , offset (computer science) , computer science , environmental science , engineering , earth's magnetic field , physics , mathematics , magnetic field , geometry , control (management) , quantum mechanics , artificial intelligence , programming language
The reactive loss generated from the geomagnetically induced current (GIC) flowing through transformers has a characteristic of simultaneity in the whole power grid, which will result in a lack of reactive power, bring about voltage fluctuation and even threaten the safe operation of power grid. To solve the voltage fluctuation problem generated by GIC, this study presents a solution to restrain the voltage fluctuation by placing grounding small resistances in transformer neutral points. Aimed at minimising the voltage offset and the configuration budget and taking account into the limit of resistance value, the generator's reactive power output and the constraint of adjustable‐ratio of transformers, a multiple‐objective optimisation strategy known as NSDEA based on the elitist non‐dominated sorting genetic algorithm combined with the differential evolution algorithm is proposed in this study, whose feasibility has been demonstrated by applying it in the placement schemes of 750/330 kV Gansu Provincial power grid and the 750 kV UHV power grid of northwest region in China. Results indicate that the optimal configuration scheme can effectively restrain the voltage fluctuation caused by GIC with the voltage offset reduced obviously, thus helps to improve the resistance strength of the large‐scale power grid to the risk of geomagnetic storm.