Journal
IEEE TRANSACTIONS ON SUSTAINABLE ENERGY
Volume 13, Issue 2, Pages 844-855Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSTE.2021.3134910
Keywords
Frequency control; Power system stability; Damping; Power system dynamics; Doubly fed induction generators; Oscillators; Analytical models; DFIG wind turbine; hydraulic generator; inertia and damping support; proportional & derivative (PD)-frequency control; ultra-low frequency oscillation (LFO)
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Funding
- U.K. Engineering and Physical Sciences Research Council [EP/S001905/1, TSTE-00688-2021]
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This paper presents a dynamic analysis of ultra-low frequency oscillations observed in wind-hydropower hybrid systems. It establishes an analytical model to capture the dynamics of frequency-responsive DFIG WTs and analyzes their interference mechanism with hydraulic generators. Recommendations are made based on the modeling and simulation studies.
This paper presents a dynamic analysis for ultra-low frequency oscillations (ultra-LFOs) observed in the wind-hydropower hybrid systems. In such systems, DFIG wind turbines (WTs) are required to be frequency-responsive with providing the inertia and frequency support. First, this paper establishes an analytical model to capture the dynamics of frequency-responsive DFIG WTs at the electromechanical timescale. A systematic analysis is then conducted on a 2-machine system (include a hydraulic generator (HG) and an aggregated DFIG WT) to reveal WTs' dynamic behaviors and their interference mechanism with the HG, accounting for the system ultra-LFO mode. The result shows that WTs' frequency control, speed control, MPPT control and pitch control would be involved in the system ultra-LFOs, but they have different effects under different operating modes. Cases studies are carried out on the 2-machine system and a modified 10 machine 39-bus New-England power system. Based on the modelling effort and simulation studies, some recommendations are made for using DFIG WTs to help damp the ultra-LFO in wind-hydropower hybrid systems.
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