Research on Multi-Energy Complementary Clean DC Delivery Considering Sending-End Resources and the Matching Mode of Receiving-End Peak Load Regulation
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摘要: 为实现我国二氧化碳排放“2030年碳达峰、2060年碳中和”以及“构建以新能源为主体的新型电力系统”的目标，能源行业发展态势发生深刻转变，新能源渗透率需进一步提升。以金沙江流域为代表的西南清洁水电群是我国清洁电力外送的重要基地，利用大型梯级水电的调蓄能力，打捆近区风电、光伏电站外送，实现整体多能互补发电，可以为送端省份提供稳定、持续的清洁电力支撑。本文选取以西南水电多能互补基地为研究对象，按照区域内清洁能源弃电率最小为目标构建优化模型，提出一种基于模式匹配算法的兼顾送端资源匹配、受端负荷与调峰需求直流外送曲线优化方法。研究结果表明，利用大型水电的调节能力与外送通道，可以实现水风光多能互补，合理优化水电站风光配比，改善新能源外送的电力品质，提升新能源消纳水平以及外送通道的利用效率。Abstract: In order to achieve Chinese goals of “carbon emission peaking in 2030 and carbon neutrality in 2060”and "building a new power system with new energy as the main body", there shall be a profound change in the development trend of energy industry and a further improvement in the penetration rate of new energy. The clean hydropower cluster in southwest China represented by the Jinsha river basin is an important base for clean power outgoing. The regulation and storage capacity of large-scale cascade hydropower may be utilized to bundle nearby wind and photovoltaic power stations for outgoing, thus realizing an overall multi-energy complementary power generation and providing stable and continuous clean power support for the receiving-end provinces. With a typical hydropower multi-energy complementary base in southwest China as the object, this study proposes an annual power transmission curve optimization method, which takes into account both electric abandoned rate of sending ends and the power load matching rate of receiving ends, and based on the sequence matching mode of peak load regulation for the receiving-end power grid, further puts forward a daily power transmission curve optimization method for DC outgoing.In this study, the optimization model is constructed based on the objective of minimizing the electric abandoned rate of clean energy in the region. The results have shown that a stable output of multi-energy complementary base can be realized by using the regulation capacity of large-scale hydropower. Through a reasonable optimization of windsolar power ratio considering the demand for sending-end resources and peak load regulation for receiving ends, the consumption level of new energy and the utilization efficiency of the outgoing channels can be improved effectively.
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