Small devices for longitudinal compensation in overhead power lines

Abstract

Distributed-series impedance (DSI) technology for overhead power lines is under active development in the United States and Russia. DSI can be used for a wide range of application, for example, for redistribution of power flows in parallel lines and cross sections; phase balancing; increasing the power-transfer capability, stability, and reliability of the functioning of an electric-power network; and reducing power losses. This article describes the principles of operation of the DSI and proposes a generalized analytical model, which illustrates the concept of controlling the reactance introduced by means of a device in a power line. The structure of an inductive-capacitive DSI with two capacitors made by OAO G.M. Krizhizhanovskii Energetics Institute in cooperation with AO NTTs FSK EES is described in detail. This work discusses general characteristics and parameters of the device. The main modes of operation of the developed DSI prototypes are presented. The feasibility of the devices has been confirmed during trial operation.