QV and PV curves as a planning tool of analysis

This paper deals with the problem of system voltage security. In this sense, load margin, QV curve and system loss reduction are focused. The idea is to use these tools in the planning scenario to determine the best locations for installation of distributed generation. For this purpose, from a base case, the system load margin and its losses are calculated. Besides that, the reactive power margin of each bus is obtained by using the QV curve, such that all the necessary information may be collected. In particular, the application of these techniques to the Paraguayan system is appealing, since this system contains a metropolitan system radially connected to a weak area, which raises some important issues associated with voltage stability.