A security system for frequency control based on dynamic regulation for electrical grids with renewable energy sources integrated.

This paper proposes a security system for frequency control in electrical grids with variable renewable generation; the spinning reserve is determined to take control actions toward operating power system in a defensive position, and the frequency droop is modified in to improve the primary frequency response. The proposed security system analyzes the electrical network in both long term and short term. For long term or steady stable operation, the spinning reserve is defined in a deterministic way to withstand the worst contingency, and in short term or dynamic analysis, if a contingency reaches the load shedding trip threshold, it is proposed to modify the frequency droop in the machines to improve system regulation. The non-controlled contribution of variable renewable generation imposes different requirements on regulation and reserve margins. Thus, the proposed security system responds dynamically to different operating conditions. IEEE 9-bus and IEEE 39-bus test systems were used, adding wind generation models to evaluate the proposed security system. The results in both test systems were satisfactory for diverse conditions and improved the frequency response. [ABSTRACT FROM AUTHOR]