چكيده به لاتين
Nowadays, rail transport systems, especially intercity railways, have been used increasingly
because of high speed and capacity, safety and cost reduction. The load of electrical trains has different dynamic and static behavior from industrial load. This loads have different characteristics such as variable amount and location, high current and voltage harmonics, significant consumption of reactive power, negative sequence current. In addition, the system of electrical trains is singlephase which makes this loads unbalanced. On the other hand, the increase of rail traffic and highspeed projects developments cause the rail transport to be an important load for the power supply network. Therefore, voltage stability and power quality of these systems have been important problems. So the fluctuations and harmonics of voltage need to be controlled and be limited with compensation. In this thesis, at first power quality and unbalancing of electrical train loads are studied. then, the static VAR compensator is considered with the aim of compensating these effects. We design a fuzzy logic controller for SVC to improve the power quality and load unbalancing. Finally, a special system model is simulated; the validation of this model and controller is investigated. The proposed model is also compared to other controller models.
Keywords: Static compensator, fuzzy logic control, power quality, unbalanced loads.
