On Market-based Robust Load-frequency Control

In a deregulated environment, Loadfrequency control (LFC), as an ancillary service essential for maintaining the system reliability, acquires a  fundamental role to enable power exchanges and to provide better conditions for the electricity trading. Since the LFC system is faced by new  uncertainties in the liberalized electricity market, a reevaluation in traditional modeling and control structures is highly needed. In response to the  coming challenge of integrating computation, communication and control into appropriate levels of system operation and control, a comprehensive scenario is proposed to perform the LFC task in a deregulated environment. As a part of the mentioned scenario, this paper addresses a new  method to design of robust LFC with considering the communication delays. First the LFC problem is reduced to a static output feedback control synthesis for a multiple delays power system, and then the control parameters are easily carried out via a mixed H2 /H∞ control technique, using a  developed iterative linear matrix inequalities (ILMI) algorithm. The proposed method is applied to a 3-control area power system and the results are  compared with the recently developed H∞ -based LFC designs.

H. Bevrani and T. Hiyama
Dept. of Electrical & Computer Eng., Kumamoto University

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