Abstract
For the interconnected power system with large-scale wind power, the problem of the small signal stability has become the bottleneck of restricting the sending-out of wind power as well as the security and stability of the whole power system. Around this issue, this paper establishes a small signal stability region boundary model of the interconnected power system with large-scale wind power based on catastrophe theory, providing a new method for analyzing the small signal stability. Firstly, we analyzed the typical characteristics and the mathematic model of the interconnected power system with wind power and pointed out that conventional methods can’t directly identify the topological properties of small signal stability region boundaries. For this problem, adopting catastrophe theory, we established a small signal stability region boundary model of the interconnected power system with large-scale wind power in two-dimensional power injection space and extended it to multiple dimensions to obtain the boundary model in multidimensional power injection space. Thirdly, we analyzed qualitatively the topological property’s changes of the small signal stability region boundary caused by large-scale wind power integration. Finally, we built simulation models by DIgSILENT/PowerFactory software and the final simulation results verified the correctness and effectiveness of the proposed model.
Highlights
With the facts of fossil energy exhaustion and global ecology environment deterioration, wind power generation [1,2,3], as the most mature and effective renewable energy technology, is developing rapidly all over the world
For the interconnected power system with large-scale wind power, the small signal stability region boundary is still determined by the eigenvalue
These systems show some visible characteristics as follows: the capacity of wind power is much larger than that of the local loads which makes it hard for it to be consumed on site; wind farms cover large areas and the power of each wind farm is transmitted into a higher voltage power grid after collection at power collection points through transmission lines; wind power needs long distance lines to be sent out; wind power bases are always located together at the end of the power grid and the outward power delivery structure is relatively weak, which results in serious stability problems, etc
Summary
With the facts of fossil energy exhaustion and global ecology environment deterioration, wind power generation [1,2,3], as the most mature and effective renewable energy technology, is developing rapidly all over the world. It is necessary to research the small signal stability of power grids with large-scale wind power integration. For the interconnected power system with large-scale wind power, the small signal stability region boundary is still determined by the eigenvalue. This paper establishes the small signal stability region boundary model of an interconnected power system with large-scale wind power based on catastrophe theory and the catastrophe indications of the eigenvalues. We summarized our work of this paper
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