Abstract
Power system flexibility is the fundamental factor affecting renewable energy curtailment problem, and proposing a flexibility quantitative evaluation method becomes crucial for development of renewable energy. As the only renewable energy demonstration region in China, Zhangjiakou is facing serious renewable energy curtailment problems, and it is of great significance to explore a suitable flexibility promotion path. In this paper, the uncertainty model for each main component in generation-grid-load-energy storage is built, and combined with these models, the production simulation method based on improved universal generating function is introduced as the flexibility evaluation tool and flexibility metrics are proposed based on flexibility definition and physical mechanism. The effectiveness of the method is verified in IEEE RTS-79 and flexibility promotion path in Zhangjiakou is also studied. The results show that retrofit of coal-fire unit is the priority measure, then the flexible grid connection and implementation of demand response, and construction of energy storage is the final measure.
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