A Strong Action Power System Stabilizer Application in a Multi-machine Power System Containing a Nuclear Power Plant

Due to the reduction in production and supplying of conventional fossil fuels quantities, the communities started to ask: what will be the future of electric power systems? Alternative answers and solutions are proposed to be applied instead of conventional fossil fuel power plants. Nuclear power plants are one of these leading alternatives. El-Dabaa nuclear power plant will be the 1^st nuclear power plant in Egypt. 1^st unit (reactor) of this plant will have only one large synchronous generator (machine) has a rated output of more than 1000 MVA (Rated at 1200 MVA). The synchronous machine will be connected to the 500 kV network while it is operating continuously 24/7, i.e. must be full loaded at all the times. This paper presents a novel control design of a strong action power system stabilizer for a nuclear power plant synchronous machine to enhance stability to this machine while it's connected to a large power grid to form a multi-machine power system. Strong action power system stabilizer can achieve system stability that allows significant increase to stability margin at steady-state period. It is effectively damp oscillations and stabilizing sub-transient and transient processes. Also, it helps to prevent sudden reductions of bus-bars voltage. In order to accomplish better damping behavior for rotor speed and terminal voltage of this machine; different signals from the machine are chosen as inputs to the strong action power system stabilizer that attached to this machine. This method confirmed its efficiency in damping frequency oscillations and terminal voltage variations of the machine. Hence, better system stability is achieved.