Coordinated Control of Multiple Damping Controllers Using Artificial Immune Network Theory

Power system stabilizer (PSS) and FACTS damping controller have been widely used to improve power system stability. Potential interactions among them can influence the effectiveness of damping control. An immune system operates to maintain the health of human bodies based on its ability to identify and respond to the intrusion of antigens. This paper explains the cooperative mechanism among antigens and different types of antibodies. A coordinated control method based on immune network theory is proposed to cope with multiple damping controllers simultaneously so as to keep a healthy level of power system damping. It acts by making full use of the advantageous interactions among controllers while minimizing adverse interactions such that power system oscillations are suppressed effectively. In this paper, an example power system installed with a PSS and a TCSC damping controller is presented that operate based on artificial immune coordinated control. Simulation results are given to demonstrate the effectiveness and robustness in variable circumstances of power system operation.