Aoyu Lei ¹ Ligang Zhao ² Yong Mei ¹ Hongyue Zhen ^2* Yongqiang Gao ¹ Tinghui Zhou ²

• ¹ 中国南方电网电力调度控制中心, 广州市, China
• ² 南方电网科学研究院, 广州市, China

The intermittency and uncertainty of renewable energy generations such as wind power have brought great challenges to the secure and stable operation of power grids. To accommodate a high penetration of renewable energy, it’s vital to coordinate multi flexible resources to deal with the intermittency and uncertainty of renewable energy and to ensure the network security. In this paper, we propose a two-stage stochastic flexible dispatching method for power system with large-scale wind power, which considers the coordination of unit commitment, optimal transmission switching and optimal control of phase-shifting transformers in a unified framework. Concerning the grid side, the flexibility is improved through phase-shifting transformer regulation and optimal transmission switching. Referred to the source side, the flexibility is fully exploited through two-stage stochastic unit commitment. In the day-ahead scheduling stage, the transmission topology optimization and the unit commitment schemes are determined based on the predicted load demand and renewable energy output. In the real-time dispatching stage, the phase-shifting transformers and the unit output are adjusted and dispatched based on the possible scenarios of load demand and renewable energy output. The effectiveness of the proposed method is verified through the case studies for the IEEE RTS-24 system and IEEE 118-bus system.