Application of static compensators in small AC systems with constant power loads

As the technology of the power electronics has developed, a new concept of small AC system was presented and studied. In this kind of stand-alone power systems, the system is divided into several modules. The load is no longer connected to the tie line directly. The power flows through a set of AC-DC-AC equipments in order to increase flexibility in the architectural system design and optimize the fuel efficiency. The load becomes a constant power type and it may increase the system instability as well. In this paper, the authors tried to study the system with the theories of voltage collapse by using a mathematical model. Finally, the authors apply the FACTS devices as the solution of the stability problem in such a kind of system based on the research result from the mathematical model.