Optimal Clearing Model for Trans-regional and Cross-provincial Spot Trading of Surplus Renewable Energy
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摘要: 跨区域省间富余可再生能源现货交易采用市场化手段有效促进了可再生能源消纳。在保证出清计算效率的前提下,如何提升出清模型的适应性和拓展性,在跨区域省间现货出清中考虑更复杂的电网运行约束,已成为省间现货市场进一步发展的关键问题之一。文中提出了跨区域省间富余可再生能源现货交易优化出清模型。结合中国特高压交直流混联电网特点和跨区域省间输电定价机制,构建了基于电力流和交易流的跨区域省间交易网络模型,并提出了计及网络损耗折价的输电成本计算方法。在竞价出清中,考虑了输电通道可用容量、爬坡能力和断面潮流限额等安全约束,以社会福利最大化为目标,构建了跨区域省间现货交易优化出清模型。算例对比了优化出清和匹配出清的结果,验证了所提优化出清模型的有效性,并说明了所建模型的适用性。Abstract: Trans-regional and cross-provincial spot trading of surplus renewable energy adopts market-oriented ways to effectively promote the accommodation of renewable energy. On the premise of ensuring clearing calculation efficiency, how to improve the adaptability and expansibility of the clearing model, and to consider more complex operation constraints for the grid in the transregional and cross-provincial spot clearing, have become the key issues for the further development of the inter-provincial spot market. In this paper, an optimal clearing model for trans-regional and cross-provincial spot trading of surplus renewable energy is proposed. Combined with the characteristics of AC/DC hybrid power grids with ultra-high voltage and the pricing mechanism of trans-regional and cross-provincial transmission, a trading network model based on power flows and trading flows is constructed,and a transmission cost calculation method considering the discount of network loss is proposed. In the bidding clearing, the safety constraints such as the available capacity of the transmission channel, the ramping capacity and the cross-sectional flow limit are considered, and the goal of maximizing social welfare is determined to build a optimization clearing model for trans-regional and cross-provincial spot. An example is given to compare the results of optimal clearing model and matched clearing model. The validity of the proposed optimal clearing model is verified, and the applicability of the built model is analyzed.
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