Mathematic Models For Minimum Cost In Security Management Of Power Market

The worldwide trends in deregulation and open access of power systems may drive modern interconnected power systems more often operate close to their transient stability limits than before. As the result, it is even more vulnerable to both static and dynamic security problems. Security control is essential for secure operation of power systems. However, in real world, effective control methods are not fully studied even in a market environment. In the paper, methods about transient stability analysis are introduced at first. Then based on the normalized generator's equations of motion and the new concept of normalized transient energy function (NTEF) and normalized transient energy margin (NTEM), the approach for assessment of transient stability energy margin is improved. The NETM is used as the stability index because the evaluation does not dependent on the concept of critical generator group, which is significant in assessment of transient stability in power market environmentsWith the analysis of different power market types in the modern deregulated electricity supply system and based on the an approach of nonlinear sensitivity of NTEM, mathematic models for minimum cost in security management of system in environments of power market under transient stability constraints of power system are proposed. The models are suitable for power markets of pool type and coexistence of contract and non-contract trades. The proposed models bring together both technical and economic considerations and the application of the models is illustrated using the 10-generator New England test system.