Pole-placement power system stabilizers design of an unstable nine-machine system

Power system stabilizers (PSS) are designed for an unstable nine-machine system. Participation factors are used to select the sites and number of stabilizers. An efficient pole-placement method is developed with straightforward formulation and a reduced computation requirement. The design not only ensures the exact pole-placement of the unstable mechanical modes, but also improves the dampings of the poorly damped mechanical modes, resulting in a well-coordinated damping for the entire system