Coordinated Power Reserve Control of Wind Farm for Frequency Regulation

With a higher wind power penetration level, the power system is facing more challenges in the aspects of active power balance and system frequency regulation. The power reserve control enables the wind farm (WF) to retain a certain available power as reserves, for participating in frequency regulation similarly to synchronous generators. In this paper, a coordinated power reserve control method of a WF for frequency regulation is proposed. By using the linear programming approach, the proposed method allocates the power reserve of each wind turbine generator (WTG) to maximize the kinetic energy of WTGs and minimize the blade pitch action of WTGs. A new coefficient to quantify the relation between the rotor speed variation and available power curtailment is defined for linear optimization. Based on the power reserve formed by the proposed method, the primary frequency control of a WF is achieved by determining the primary frequency control coefficients of WTGs. Finally, case studies based on EMTP-RV simulator are carried out to validate the proposed method. The results show that the proposed method can realize the power reserve control of a WF and improve the frequency regulation ability of a WF effectively.