| Special Protection Systems (SPS) are widely used in power systems at the present time. Several schemes are being adopted depending on the situation. The purpose of the SPS is to mitigate and correct consequences caused by severe disturbances. The SPS is proposed in this thesis to remedy and amend the circumstance due to the outage of Kanorm power plant at Thailand system. The outage results in synchronous instability in the local area. Without SPS, the system is isolated and consequently the isolated area is in blackout. Thus, load rejection and shunt compensating are two proposed schemes to solve the problem. Among numbers of load buses, sensitivity analysis is applied to determine the most effective load buses to be shed. Instead of blackout of the entire isolated area, the simulation results demonstrated that the disturbance can be effectively reduced and situation can be controlled by using the SPS. |
