The structural changes that occurred in the market of electricity made the economy have the same importance as the safety in electric systems. Consequently, the investments are more pondered, usually not following the growth of the demand. As a result, the systems tend to operate at their maximum use. At the same time, there is an encouragement regarding the use of wind power, which on the one hand improves the generation capacity but on the other harms the frequency. To use the wind power, maintaining good frequency quality, some resources could be used, such as an increase in the spinning reserve, the limitation on the penetration level of the wind power, the use of turbines with blade pitch control, electronic interfaces and storage of active power, however they are onerous and partial solutions. Considering these issues, the evaluation of a hybrid solution is proposed, where a modified load shedding helps the conventional control in the frequency regulation. This load shedding is seen as an operational tool, which also operates in a steady state and not only as an emergency measure. This may allow obtaining the advantages of the wind power while its implications in the frequency stay soften, with compatible cost.
Load relieve; Frequency control; Wind power; Spinning reserve; Steady state
