Power oscillation damping controller design for TCSC based on the test signal method

In this paper, a new approach based on the test signal method is put forward to tune the parameters of the TCSC power oscillation damping (POD) controller. The approach avoids the complicated eigensolution of the state matrix that results in heavy computational burden. The approach is composed of three steps. First, the inter-area oscillating modes of a power system is identified and the information necessary for designing the TCSC POD controller is obtained by the test signal method. Second, the input signal of the POD controller is selected through comparing the residue ratio of the different input signals. The third, the controller parameters are tuned to compensate the residue phase angle. The validity of the design is illustrated by comparing the changes of the damping ratio in frequency domain and by a transient simulation in time domain. The case study shows that the test signal method is effective and convenient for designing the TCSC POD controller, and it can be used in large power systems.