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• W2100607062 abstract "In this report the influence of line protection on transientand voltage instability is investigated. Different types of line protection applications are discussed and their likelihood of contributing to power system instability is analysed. It is concluded that distance protection is one of the most critical issues in EHV systems with respect to transientand voltage instability. Different types of relay characteristics used in distance protection are analysed. Additionally the significance of coordination between distance protection and generator current limiters in case of voltage instability is investigated. Subsequently the interaction between distance protection and other protection devices during power system instability is discussed. Conventional Power Swing Detectors and Out of Step Protection have also been examined. New distance protection algorithms based on mathematical logic blocks are introduced. These algorithms use conventional distance relaying in combination with certain additional criteria to increase the relay security with respect to voltageand transient instability. To prevent undesirable distance protection operation during voltage instability, an adaptive algorithm is proposed where the derivative of the voltage is applied as an additional relay criterion. In addition algorithms which prevent mal-trips due to power oscillations are developed. The additional criteria applied for these algorithms are based on symmetrical component theory and the derivative of the phase angle of the current as seen by the relay. To increase robustness a scheme is developed where all additional criteria mentioned above are applied in a single algorithm. Studies undertaken are based on simulations using two different test systems; a fifteen bus system developed by the author and the well known Nordic32 system. When the fifteen bus system is used for transient stability studies three additional buses are added. Statistics of zone 3 distance protection operation in the Swedish transmission system are presented for the period 1985 2000. Additionally a number of disturbances related to distance protection and power system instability is investigated. The work shows that undesirable zone 3 distance relay operation during voltage instability can make the difference between a total blackout and a recovering system. Simulations have shown that the adaptive algorithm proposed may save the system from collapse." @default.
• W2100607062 created "2016-06-24" @default.
• W2100607062 creator A5023036695 @default.
• W2100607062 date "2001-01-01" @default.
• W2100607062 modified "2023-09-23" @default.
• W2100607062 title "Line Protection and Power System Collapse" @default.
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