ADVANCED SVC CONTROL FOR DAMPING-POWER SYSTEM OSCILLATIONS

Dynamic reactive power compensation is used to an increasing extent to improve voltage and reactive power conditions in ac systems. Additional tasks can also be performed by the Static Var Compensators (SVC) to increase the transmission capacity as result of employment of SVCs for power oscillation damping. This is of particular importance in the case of weakly coupled power systems. A new SVC control for damping of power system oscillations has been developed. To increase system damping SVC uses phase angle signal estimated from the measurement of voltage and power at the SVC location. By means of an optimization and identification procedure optimized design of the damping control with various control concepts can be determined taking into account non-linear power systems. As a result of this method it is possible to increase power system damping considerably, in particular in critical situations close to the stability limit, using only locally measured state variables at the SVC thus leading to increased transmission capability of the power system.