PRÉ-DESPACHO DE POTÊNCIA ATIVA CONSIDERANDO AS ÓTICAS DOS AGENTES GERADORES E DO OPERADOR DO SISTEMA / PRE-ORDER IN ACTIVE POWER CONSIDERING THE OPTICIANS OF AGENTS GENERATORS AND SYSTEM OPERATOR

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The restructuring and deregulation of electricity markets has caused signicant changes in electrical power systems in several countries. This process has result in a market-based competition by creating an open market environment. In this new environment each generation company runs the Unit Commitment to maximize their prots, and have no obligation to meet the energy and spinning reserve demands, as happened in the past. With this new structure, the Unit Commitment problem has received special attention, since generation companies in actual model always seek the maximum prot without concern to serve all demands. On the other hand, there is the system operator, which always seeks to optimize overall system at the lowest cost. So, there are two dierent situations into this competitive market environment: generators seeking the maximum benet without concern to the system security operating, and independent system operator seeking always operate the system safely and at less cost. This work presents the mathematical models and the solution Unit Commitment problem, which was implemented considering two view points: the generation companies and the system independent operator views. Moreover, an auction model is extended to PRD in a horizon of 24 hours. This auction model simulates the interaction between generators and system operator to meet demands and security of the system. The idea is to stimulate the players to oer products to energy (primary) and reserve (Ancilar Service) markets using only prices oered by market operator for each product. This iterative process is nalized when generators supply sucient to meet demand, and not cause any violation on ow limits in transmission lines. The solution method proposed for Unit Commitment is based on evolution strategies and Lagrange Relaxation, resulting in a robust hybrid algorithm. The method have been validated in a test system composed of 6 buses, 7 transmission lines and 10 generating units. The results showed the eciency of the hybrid model proposed, which was able to solve the unit commitment problem in its various models considered here.

ASSUNTO(S)

ambiente competitivo engenharia eletrica unit commitment power systems evolution strategies estratégias evolutivas competitive environment pré-despacho de potência sistemas de potência mercado de energia elétrica lagrange relaxation security system operation relaxação de lagrange restrições de sistema electricity market

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