Series compensation of transmission lines is one of the most effective means to increase the loading margin of an interconnected power system. In this paper, a methodology is proposed for the identification of the critical transmission lines and their proper compensation rate with respect to voltage stability using decision trees (DTs) methodology. This methodology is applied to the Hellenic interconnected transmission system in normal operation and in (N-1) configurations, taking into account its future expansion plans. Results are validated by comparison with sensitivity analysis.

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Suggested network reinforcements to increase Available Transfer Capability of an interconnected power system include series compensation of transmission lines. In this paper a methodology for the identification of the critical transmission lines with respect to voltage stability issues is proposed. The methodology is applied on the CIGRE 33-bus test system.

Ahtrucr-Thyristor controlled equipment is one of the major sources of harmonics in power systems impacting power quality. In this paper Thyristor Controlled Series Capacitor (TCSC) installed by power utilities for increase of power transfer capability of transmission lines is investigated in terms of harmonic distortion in the power system In addition, series compensation may cause subsynchronous oscillations leading to subsyncrhonous resonance (SSR) phenomena. The investigation of a TCSC control strategy that ensures sufficient SSR damping is presented Zndex TermeSeries Compensation, Thyristor Controlled Series Capacitor, Harmonics, Subsynchronous Resonance.

This paper deals with the application of Thyristor Controlled Series Capacitors (TCSCs) suitably rated for radial distribution circuits. The various problems existing on long distribution lines that can be alleviated by the connection of variable series compensation, as a TCSC provides, are discussed. An important feature is the capability of the TCSC to operate as a short circuit current limiter. Thus, sensitive loads connected to nearby substations will not experience any voltage sags caused by faults on the distribution line where the TCSC is connected. The benefits of the connection of a TCSC on a radial distribution system are verified by means of the ElectroMagnetic Transients for DC (EMTDC) simulation package.