Abstract
Wind turbines can have inertia characteristics similar to synchronous generators through virtual inertia control, which helps to provide the inertia support for the system. However, there is the problem of how to coordinate the allocation of virtual inertia among wind turbines. In response to this problem, this paper first analyzes the inertia response capabilities of wind turbines and puts forward an evaluation index that quantifies the inertia response capability of wind turbines. The inertia response capability of a wind farm is evaluated at the entire system level. Based on the evaluation index, the virtual inertia coordinated allocation method considers the system inertia demand and the inertia response capabilities of the wind turbines. It is proposed to release the inertia response capability of each wind turbine while avoiding an excessive release of kinetic energy and bring a second impact by wind turbines’ exiting operation. Finally, the effectiveness of the proposed method is verified by a simulation case study.
Highlights
The inertia of a power system is of great significance to the frequency stability of the power grid, and it has resistance to system frequency changes caused by disturbances
With the increase in the penetration rate of wind power in power systems, traditional synchronous generators are gradually being replaced by wind turbines, resulting in a continuous reduction in the inertia in the system, and the frequency stability of power systems is facing a huge threat [2]
The inertia response capability evaluation index K proposed in this paper can reflect the inertia response capability of wind turbines
Summary
The inertia of a power system is of great significance to the frequency stability of the power grid, and it has resistance to system frequency changes caused by disturbances. A quantitative analysis of the frequency regulation capability of a single wind turbine was conducted in [16], and a self-coordinated frequency control method for wind turbines was proposed based on the frequency modulation capability of the wind turbine. This method only considers the operating status of the wind turbine itself. Wind turbines participate in the inertia response through a virtual inertia control that introduces a frequency change rate to adjust the active power output of the wind turbines. The virtual inertia time constant can reflect the supporting power of the wind turbine participating in the inertia response
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