Simultaneous Scheduling of Energy and Frequency Control Ancillary Services in regard to Load Self-regulation Effect

A power system is exposed to sudden variation, unwanted changes in system demand or losing a generating unit that cause a frequency deviation in system frequency. In restructured power systems, frequency control resources must be prepared to compensate this unwanted effect. It is one of the most important tasks of ISO. Previous researches have demonstrated that simultaneous scheduling of energy and frequency control reserves is preferred to sequential scheduling method; therefore this paper discusses simultaneous method considering both transmission congestion and self-regulation effect of load. Furthermore, the paper presents a string of novel inequalities to distinguish unfeasible statuses of participants in the sale. The present problem is mixedinteger and nonlinear, so GAMS and MATLAB software are jointly used to solve it. Finally, the proposed method is implemented on a 39-bus case system. The obtained results verify the efficiency and robustness of the proposed method. In this survey, it is assumed that the market structure is pay as bid.