Power system stabilizer in dynamic stability assessment

Power system disturbance have occurred since the initial development of power systems. Most disturbances are caused during stressed power system conditions followed by sequence of low-probability outages. Dynamic stability is identified as the main issue in real power system. Thus, power system stabilizer (PSS) is vital to ensure small signal stability of power systems. Low frequency oscillations are detrimental to the goals of maximum power transfer and optimal power system security. A contemporary solution to this problem is the addition of power system stabilizers to the automatic voltage regulators on the generators in the power system. The damping provided by this additional stabilizer provides the means to reduce the inhibiting effects of the oscillations. Power producers can take steps to ensure that their generator controls are equipped to support transmission system reliability by enhancing the excitation controls. This paper presents dynamic stability assessment in the presence of power system stabilizer. A simple Matlab/Simulink model has been developed to represent the transmission system in towards dynamic stability assessment. Various experiments have been conducted to realize the impact of PSS to the system stability.