可再生能源跨区消纳的受端电网阻塞机理分析

随着区外来电馈入和可再生能源并网,受端电网开始出现电源负荷分布不均导致的区域输电通道裕度不足问题,由于送端与受端电网电源与负荷特性的差异,调峰需求不同,区域间调峰互济将引起裕度不足的输电断面阻塞。文章针对华东某省受端电网出现的过江断面输电阻塞问题,分析了区外来电和本地可再生能源对系统调峰的影响,建立了南北调峰互济引起过江通道阻塞机理分析模型。算例模拟了系统总备用和平均备用方式下受端电网可能出现的2种阻塞情景,借助GOPT仿真软件对该省2025年规划态进行全年时序仿真进一步论证阻塞现象。通过全文的机理分析,最后提出可通过分区差异化分配备用、分区差异化配置调峰电源的方式来缓解区域输电阻塞问题。

Analysis on Transmission Congestion Mechanism of Cross-Region Renewable Energy Integration in Receiving-End Power Grid

With large amount of outside power injection and renewable energy grid-connection,the regional transmission congestion problem caused by unbalanced distribution of power supply and load begins to appear in the receiving-end grid.Because of the difference of power sources and loads peculiarity,peak regulation demand between sending-end grid and receiving-end grid,the interregional peak adjustment will cause the transmission section obstruction with insufficient margin. In view of an eastern developed province receiving-end grid’s transmission congestion problem,this paper analyzes the effects of high proportion of outside power and local renewable energy on peak load regulation. Then a congestion mechanism analysis model is established. In the example,two different congestion scenarios are simulated under the two reserve power supply modes of total reserve and average reserve,and a continuous time-sequence simulation of the province’s planning state in 2025 is carried out w ith GOPT simulation softw are to further demonstrate the blocking phenomenon. Through the mechanism analysis of this paper, some suggestions are put forw ard to alleviate the regional transmission congestion, such as differentiated allocation of peak load regulation pow er and differentiated allocation of reserve.