Adaptive fractional‐order control of power system frequency in the presence of wind turbine. Issue 4 (19th December 2019)

• Record Type: Journal Article
• Authors: Kazemi, Mohammad Verij; Gholamian, S. Asghar; Sadati, Jalil
• Is Part Of: IET generation, transmission & distribution. Volume 14:Issue 4(2020)
• Page Start: 594
• Page End: 605
• Publication Date: 2019-12-19
• Subjects: power grids -- wind turbines -- robust control -- wind power plants -- adaptive control -- frequency control -- power generation control -- approximation theory -- power system stability; adaptive fractional‐order control -- wind turbine -- droop control -- grid frequency control -- wind power systems -- first‐order derivative -- inertial control loop -- frequency variation -- Tustin method -- droop loop gain -- power system frequency control -- frequency error information -- fractional‐order adaptive law -- inertia control loop -- robust system -- parameter space method -- fractional‐order‐based adaptive approach -- frequency nadir -- frequency‐based information -- fraction approximations -- prewarping -- inertial loop gain; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.0458
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Inertial and droop control are common methods for improving grid frequency control. Using the first‐order derivative of the frequency in the inertial control loop only investigates the rate of frequency variation, while other useful information is not taken into consideration. Accordingly, in this study, the application of a fractional‐order derivative (between 1 and 2) in the inertial control loop is proposed to have more useful frequency‐based information. To achieve this goal, firstly continued fraction approximations and secondly, the discretization is adopted by using the Tustin Method with Prewarping. Inertia loop and droop loop gain have a significant impact on the operation of the wind turbines and the power system frequency control. Therefore, in this paper, a novel method for the adaptive adjusting of droop and inertia control loops gains in DFIG is proposed. To utilize more frequency error information, fractional‐order adaptive law is proposed to update the loop gains and the inertia control loop. In order to have a robust system, which is permanently stable for every fractional order (FO), is used parameter space method. Simulation results demonstrate the proper performance of the FO‐based adaptive approach to increase the frequency nadir (FN) and decrease the frequency variations.