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Sensitivity of symmetric component digital filters to voltage harmonics



Komkov A.N. (Gubkin State Oil and Gas University, RF, Moscow)

E-mail: komkov.a@gubkin.ru

It was found that under voltage failure, asymmetry coefficient and total harmonic distortion tend to exceed admissible levels set by GOST 321442013 domestic standard. No such voltage failure parameters are defined by this standard as they mostly apply to emergencies. This paper aims to assess effects of higher voltage harmonic components on accuracy of direct and opposite voltage parts, or asymmetry factor. It was found that changes in voltage harmonics have minor effect on accuracy of direct sequence voltage component, and initial voltage filtration is not critical as a result. By contrast, higher harmonics appear to strongly impact the accuracy of negative sequence voltage, this calls for isolation of fundamental harmonics for relay protection systems such as stability loss protection. These and other conclusions are believed helpful under automation system relay protection design.

References

1. Komkov A.N. Odinnadtsataya Vserossiyskaya konferentsiya molodykh uchenykh, spetsialistov i studentov Novye tekhnologii v gazovoy promyshlennosti (gaz, neft, energetika). Tezisy dokladov [The Eleventh All- Russian conference of young scientists, professionals and students New Technologies in Gas Industry (gas, oil, energy). Abstracts of papers]. Moscow, RGU nefti i gaza Publ., 2015, p. 521.
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4. Ershov M.S., Egorov A.V., Valov N.V., Komkov A.N. Uchet nesimmetrii pitayushchego napryazheniya v sistemakh zashchity ot poteri ustoychivosti promyshlennykh elektrotekhnicheskikh sistem [Accounting of nonsymmetry of voltage in the systems of protection against loss of stability of industrial electrical systems]. Promyshlennaya energetika, 2011, no. 9, pp. 2224.
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6. Komkov A.N., Guseingadzhiyev A.O. Vliyaniye nesinusoidalnosti na rabotu filtrov simmetrichnykh sostavlyayushchikh [The impact of nonsinusoidality at the work of filters of symmetrical components]. Fedorovskiye chteniya 2015. XLV mezhdunarodnaya nauchno-prakticheskaya konferentsiya s elementami nauchnoy shkoly [Fedorovskiye Readings 2015. XLV International Scientific and Practical Conference with the elements of scientific school]. Moscow, MEI Publ., 2015, pp. 318322.



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