Improving Frequency Regulation of Power System Using Primary and Secondary Reserves in Grid Integrated Wind Farms

Abstract

Today, with integration of renewables in the grid, many synchronous generators (SGs) are shut down or operated at reduced power levels. This reduces inertia of the system which leads to stability issues. In such a situation, it is desirable to allow power reserve (PR) in renewable generation, along with SGs, which improves frequency regulation (FR) of the power system. For this purpose, in this paper, a reserve allocation (RA) method for grid integrated wind farms (WFs) is proposed. The RA allocates PR among primary and secondary reserves in each WF. These reserves are engaged in FR of the power system by rotor speed controller and pitch angle controller of wind generators in the WFs. The proposed RA is tested in modified New England 39 bus system with WFs. The proposed method is verified with different percentages of the primary and secondary reserves for constant and variable wind speed conditions at the WFs.