Analysis of Primary Frequency Response Based on Overspeed and Pitch Control Reserve and Coordinated Control Strategy

Abstract

The large-scale integration of wind turbines into the power system will result in insufficient primary frequency response capability. Deloading control including overspeed and pitch control reserve is proposed for wind turbines to enhance the primary frequency response capability of the system. However, there is a lack of a quantitative characteristic of these deloading, which hinders the establishment of a correspondence between wind power reserve and its ability to provide primary frequency response. To tackle this problem, this paper analyzes the characteristic of overspeed and pitch angle reserves, calculates the reserve power and rotor kinetic energy (KE) and analyzes the primary frequency response capability boundary. Based on the boundary, a wind turbine primary frequency response strategy based on fast frequency response (FFR) is proposed. Simulation demonstrates that the coordination of overspeed and pitch angle reserves can stabilize wind turbines and continuously release power to reduce the steady-state frequency deviation of the system, thereby effectively supporting the system frequency.