Literature Review of the Operational Characteristics of Static Var Compensator (SVC) in Electric Power System

摘要

This work looks into the literature review of the static Var compensator as it relates to the functional performance of the device in electric power system. Individual members of the compensator family are discussed with focus on the diverse operational features of the various constituting components. Modeling of the device is carried out, taking FC – TCR as a reference and deriving its susceptance with attention on the mathematical relationship of the constituent variables and their interdependency among one another. Graphical illustration between the adjustable susceptance and the thyristor firing angle is made, highlighting the imperturbability of the resonance angle on the linearity of the susceptance variation with respect to changing delay angle. Several mathematical computations are made to derive different equations that lead to some electric quantity expressions and their natural impart on the system. Steady and dynamic conditions of voltage and current characteristics are related, throwing light on the operational relationship among the three main parameters of the SVC device (B SVC , Current and Voltage). The manner of reactive power exchange between the SVC equipments and the power system is explicitly explained, pointing at responsively fast control mechanism via the thyristor angle for adequate reactive power exchange and the consequent system compensation. The conductivity of TCR, under its independent existence as an SVC compensator or as a branch of other SVC devices is considered to reveal the effect of conduction angle and the thyristor firing angle in determination of flow of reactor current on the branch. Effect of SVC harmonics on power system is considered , and a brief suggestion made on the effective means of harmonics control in power system.