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This paper presents the design and analysis of a compensation method withapplication to a 345 kV 480 MVA three-phase transmission line. The compensatorsystem includes a series injected voltage source converter that minimizes theresonance effects of capacitor line reactance. This creates an ability tocompensate for the effects of subsynchronous resonance and thereby increaseline loadability and control real and reactive power flows. The granularity ofpower flow control and simultaneous stabilization is achieved by the method ofdirect decoupled power control (DPC). The design process is detailed withrespect to optimal response characteristics considering variations of lineparameters, realistic transformer impedances, and maximum ramp response rates.Line effects are demonstrated in a PLECS model in MATLAB, and compensationcontrol system functionality is verified. A case study is provided of a 345 kVtransmission line from an EMTP simulation in PSCAD that accounts fordistributed parameter effects that are encountered in physical EHV transmissionlines. This demonstrates the improvement in stability to power systemtransients as well as damping of power system oscillations.

A Direct Power Controlled and Series Compensated EHV Transmission Line