The events for prevention of resonant overvoltages in main power electrical networks
Main Article Content
Abstract
science , pr. Peremogy, 56, с. Kyiv, 03680, Ukraine.
The study of the origin of conditions and possible consequences of abnormal modes power electrical networks with extreme values parameters, such as overvoltage, traditionally performed using mathematical models with linear and symmetrical elements. This is due to great experience in the development and use of this class of models on practice, since the basis for decision-making in the design and operation of electrical networks is simulation of results primarily in normal modes. At the same time, a more detailed analysis shows that the presence in modern electrical networks sources of distortion, mainly unbalance, influences the current values of the parameters modes, including the probability of transition of these values through thresholds.
Trends of modern electricity power grid point to the growing role of extra high voltage (EHV) transmission lines as those that constitute the system and interconnect systems. It should be noted that the study of overvoltage for this class lines must be done very carefully, particularly with regard to the impact of sources of distortion. This is due to the lack of practical operational reserve insulation, designed for extreme values, as a such reserve for EHV is expensive. Thus, analysis of the possibility of overvoltage in EHV lines should be done not only for normal, but also for abnormal asymmetrical modes.
In main electric power networks are used, above all, structural measures to reduce and suppress the resonant overvoltage associated with changes in workload schemes and the transition from an abnormal to normal mode. However, special devices or setting modes by the criterion of reducing the overvoltage can be used when needed, which have been established for other purposes. At the same time the resonant overvoltage caused by current resonance, resulting in influence on the kind of overvoltage is possible by changing the parameters of elements connected in parallel to overhead line. These include, in particular: the neutral inductance and shunt reactors. In this case, the criterion of the occurrence of resonance overvoltage is the length of the line at which the condition of complete current resonance is performed.
Reference 5, figures 1.
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
References
Dorozhko L.I., M. S. Libkind (1977), “Reactors with a transverse magnetization”. M.: Energiya. P. 177. (Rus)
Intelligent power systems: the elements and modes. Pod obsch. red. akad. NAN Ukrainyi A.V. Kirilenko. Institut elektrodinamiki NAN Ukrainyi. – K.: In-t elektrodinamiki Nan Ukrainyi. 2014. – P. 408. (Rus)
Kuznetsov V.H. (2013), “Investigation of transposition EHV transmission lines on abnormal overvoltage”. V.H. Kuznetsov, Iu.I. Tuhai, V.V. Kuchanskyi. Tekhnichna Elektrodynamika. Vol.6. pp.51–56. (Ukr)
Kuzmicheva K.N. (1985), “The star overvoltage arresters for the reactor connections of 500 kV”. Elektricheskie stantsii. Vol. 9. pp.15–18. (Rus)
Cheng C.P. (2010), “Simulation of resonance overvoltage during energization of high voltage power network”. Proceedings of International Conference on power Systems transients IPST 2003 in New Orlean. USA, October 9–13. pp. 71–75
