Transient stability of colombian national transmission system with Small Hydro plants

The electric power system has become larger and more complex in recent years, making transient stability a significant problem. This paper presents a study of transient stability of an area of the Transmission System Colombian National in order to determine the impact on the transient stability and behaviour short circuit currents, because of the installation of distributed generation in larger scale. The impact of the massive installation of Distributed Energy Resources on an electrical power system is presented primarily on the distribution system (levels of 34.5 kV and lower) and quantifies its benefits and challenges are a task relatively simple. The quantification of performance on transmission systems (115 kV and above) tend to be more complex and cannot be directly determined, given that the energy matrix of each electric power system and presence of different technologies of Distributed Energy Resources vary by country and therefore the impact on system. In Colombia, in May of 2014, the 1715 law was signed which aims to promote the development and use of Distributed Energy Resources. This law aims to increase the installation of Distributed Energy resources in Colombia. In this paper a simulation model is proposed for the subsystem called CQR Colombia (Caldas-Quindío-Risaralda), where there are 13 projects with Distributed Generation from Small Hydro totalling 234 MW. The model and the simulations were performed using the computational tool DIgSILENT Power Factory. The results show that the stability of the National Transmission System may be affected by a massive installation of Distributed Energy Resources and that stability depends mainly on the type of technology and the response of the system frequency and voltage control.