Voltage security analysis of power systems under deregulation

In this paper, the authors analyze impacts of deregulation of electrical power industry in terms of voltage security. For bilateral transactions to be physically feasible, available transfer capability and other impacts must be carefully examined by the system operator. In the conventional approaches, mostly based on DC power flow models, approximate power flows on transmission lines and the associated costs are made available. However, the important voltage-reactive power model is neglected. Depending on the reactive power capability of the generators in the system, voltage security in case of bilateral transactions might pose a serious problem or can be positively supported by independent generators.