Model predictive load–frequency control taking into account imbalance uncertainty. (August 2016)

• Record Type: Journal Article
• Authors: Ersdal, Anne Mai; Imsland, Lars; Uhlen, Kjetil; Fabozzi, Davide; Thornhill, Nina F.
• Is Part Of: Control engineering practice. Volume 53(2016)
• Page Start: 139
• Page End: 150
• Publication Date: 2016-08
• Subjects: Model predictive control -- Load frequency control -- Robust control -- Intermittent energy resources -- Power system control; AGC automatic generator control -- CMPC centralized model predictive control -- CPM control performance measure -- DMPC distributed model predictive control -- EKF extended Kalman filter -- FCR frequency containment reserves -- FRR frequency restoration reserves -- HVDC high voltage direct current -- LFC load frequency control -- MPC model predictive control -- NERC North American electric reliability corporation -- NLP nonlinear program -- NMPC nonlinear model predictive control -- NNMPC nominal nonlinear model predictive control -- OCP optimal control problem -- PM prediction model -- PMU phasor measurement unit -- PRM plant replacement model -- RNMPC robustified nonlinear model predictive control -- RR replacement reserves -- TSO transmission system operator; Automatic control -- Periodicals; 629.89
• DOI: 10.1016/j.conengprac.2015.12.001
• Languages: English
• ISSNs: 0967-0661

Abstract

Abstract: Nonlinear model predictive control (NMPC) is investigated for load frequency control (LFC) of an interconnected power system which is exposed to increasing wind power penetration. The robustified NMPC (RNMPC) proposed here uses knowledge of the estimated worst-case deviation in wind-power production to make the NMPC more robust. The NMPC is based on a simplified system model that is updated using state- and parameter estimation by Kalman filters, and it takes into account limitations on among others tie-line power flow. Tests on a proxy of the Nordic power system show that the RNMPC is able to fulfill system constraints under worst-case deviations in wind-power production, where the nominal NMPC is not. Abstract : Highlights: A nonlinear MPC (NMPC) is designed for load frequency control (LFC) of a power system. The NMPC is robustified (RNMPC) against variations in wind-power production. The controller is tested on a proxy of the Nordic power system. Results show that the RNMPC fulfills system constraints, while the NNMPC does not.