Abstract
As the penetrated level of wind in power grids increases, the online system inertia becomes weak. Doubly-fed induction generator (DFIG)-based wind turbine generators (WTGs) are required to provide virtual inertia response to support system frequency. The present inertia control strategy with fixed control gain is not suitable and may cause stall of the DFIG-based WTG, as the virtual inertia response potential from the DFIG-based WTG is different with various wind speed conditions. This paper addresses a virtual inertia control method for the DFIG-based WTGs to improve the system frequency stability without causing stalling of the wind turbine for various wind speed conditions. The effectiveness of the proposed virtual inertia control method is investigated in a small system embedded with the DFIG-based WTG. Results demonstrate that the proposed virtual inertia strategy improves the frequency stability without causing the rotor speed security issue. Thus, the proposed control strategy can secure the dynamic system frequency security of power systems under the scenarios of full and partial loads, and, consequently, the proposed method provides a promising solution of ancillary services to power systems.
Highlights
As a renewable energy, the wind power integrations have been continuously increasing during the last few years due to air pollutants and energy shortages
The virtual inertia control capability of a doubly-fed induction generator (DFIG)-based wind turbine generators (WTGs) is critically dependent on the kinetic energy available from the DFIG-based WTG, which is related to the wind speed conditions
The virtual inertia control capability of a DFIG-based WTG is critically dependent on the kinetic energy available the DFIG-based
Summary
The wind power integrations have been continuously increasing during the last few years due to air pollutants and energy shortages. Variable-speed wind turbine generators (WTGs) are the most dominating type of wind generation and replace the conventional synchronous generators due to their advantages, namely, maximum mechanical power capture, reduced acoustical noise, and reduced mechanical stresses on the turbine [1,2]. As stated in [3], DFIG-based WTGs constitute more than 50% of the installed WTGs. large integrations of DFIG-based WTGs may bring severe challenges on electric power systems. The reason is that DFIG-based WTGs decouple the rotor speed from the system frequency; they are unable to provide inertia response. The online system inertia becomes weak [4,5] Such inertia issues become significant with the penetrated level of wind increase. DFIG-based WTGs are required to provide frequency support capability to guarantee the system frequency stability of power systems with high penetrated wind
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