Patent ID: 8558405

Claim:
A full converter connected to a series compensated transmission line, the full converter comprising: a generator side converter; a DC link connected across an output of the generator side converter; a line side converter connected across an output of the DC link, the line side converter further comprising; a converter controller configured to control the line side converter, the converter controller responsive to measured three phase voltages and measured three phase currents on the transmission line, each phase voltage and each phase current is transformed into a d-axis positive sequence value, a q-axis quadrature positive sequence value, a d-axis negative sequence vale and a q-axis quadrature negative sequence value and combined to generate a combined d-axis value and a combined q-axis value; and a three phase pulse width modulated modulator for receiving the combined d-axis and the combined q-axis values for generating three phase voltage signals supplied to the series compensated transmission line to mitigate effects of subsynchronous oscillations present on the series compensated transmission line.