Enhanced Security-Constrained OPF With FACTS Devices
ABSTRACT The features of the new electricity market with the presence of many different operators lead to a new interest in the congestion management. The changes to the market-clearing point schedules required by the presence of bottlenecks in the electric grid can be strongly reduced if flexible ac transmission system (FACTS) devices are suitably installed in the transmission system with the aim of redistributing real and reactive power flows. Their optimal setting and operation mode can be determined by the use of customized security-constrained optimal power flow (SCOPF) programs. This paper deals with the use of FACTS devices as control variables in a compact and reduced SCOPF formulation, focusing on the definition of their control regions and on a new procedure implemented to find a global solution without sticking on local minima. The application of the new SCOPF procedure to a real system is also presented.
Conference Proceeding: Minimizing Balancing Market Congestion Re-dispatch Costs by Optimal Placements of FACTS Devices[show abstract] [hide abstract]
ABSTRACT: The paper proposes a method to help evaluate how optimal placement of FACTS devices, and in particular thyristor controlled phase shifter transformers, can reduce costs associated with congestion re-dispatch in a balancing market. Balancing market exists in markets in which most of the trading is done via decentralized bilateral contracts. In these markets only final adjustments necessary to ensure secure system operation is carried out at a centralized balancing market. Each market player can participate in the balancing market by submitting offers and bids to increase and decrease its initially submitted active generation output. The proposed technique is based on mixed integer linear programming, so that a power system network is represented by a simplified DC power flow. Market participants' offers and bids are also represented by linear models. Results show that applications of FACTS devices can significantly reduce costs of congestion re-dispatch.Power Tech, 2007 IEEE Lausanne; 08/2007