Abstract
In the article an experimental power system consisting of Russian equipment, as well as 220 kV power line distance protection, are simulated in the RTDS Simulator. The settings were calculated and the polygonal characteristics of distance protection were constructed. A sequential installation of wind turbines into various nodes of the power system was carried out and the correct operation of the protection was verified. As a result of the study, the impact of wind turbines on the distance protection when they are connected between the protection installation site and the point of the short circuit is revealed. The analysis of this impact is made. Possible ways to solve the identified problems are proposed, such as the use of adaptive distance protection, as well as numerous studies of the behaviour of wind turbines in various operating modes for further analysis and possible adjustment of guidelines for relay protection using new algorithms for calculating and configuring of distance protection. The results of this work can be used to improve and clarify the recommendations for tuning, produced by manufacturers of relay protection devices, which currently do not take into account the impact of wind power generation.
Highlights
In modern power systems introduce new generating sources based on renewable energy
Their structure and behavior in different modes of operation of the power system differs significantly from the traditional synchronous generators existing in the power system
It should be understood that wind turbines affect both the state of the power system as a whole and its individual parts
Summary
The effect of wind generators on the distance protection of a 220 kV power line has been revealed. The reasons for such deviations are: (a) a different behaviour of SCIG generators during a short circuit compared to traditional synchronous generators, which seems to be an important factor for determining the characteristics of distance protection, (b) the variation in wind speed and character significantly affects the reach of the distance relays set This leads to changes in the apparent impedance seen by the protective relay and causes changes in the reach setting of the relay. The use of adaptive distance protection, as well as studies of the behaviour of wind turbines in various operating modes for further analysis and possible adjustment of guidelines for relay protection using new algorithms for calculating and configuring distance protection can be solutions to the identified problems
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