Simulation of AGC in Deregulated Environment

In a restructured power system, the engineering aspects of planning and operation have to be reformulated although essential ideas remain the same. With the emergence of the distinct identities of GENCO_s, TRANSCO_s, DISCO_s and the ISO, many of the ancillary services of a vertically integrated utility will have a different role to play and hence have to be modeled differently. Among these ancillary services is the automatic generation control (AGC). In the new scenario, a DISCO can contract individually with a GENCO for power and these transactions are done under the supervision of the ISO or the RTO. The concept of a DISCO participation matrix (DPM) is proposed which helps the visualization and implementation of the contracts. The information flow of the contracts is superimposed on the traditional AGC system and the simulations reveal some interesting patterns. The trajectory sensitivities are helpful in studying the effects of parameters as well as in optimization of the ACE parameters viz. tie line bias and frequency bias parameter B. The paper is organized as follows. In this, we explain how the bilateral transactions are incorporated in the traditional AGC system leading to a new block diagram, Simulation results are presented and followed by conclusions.