基于四川水电调峰外送情景下的受端电网接纳空间分析

Receiving Space Analysis of Receiving Power Grid Based on Sichuan Hydropower Peak Load Regulation Scenario

当前有关四川水电跨省消纳研究多以水电外送电量最大化为目标而忽视了受端电网调峰压力问题,实际上若受电区调峰形势严峻,则难以实现水电跨省最大化消纳的真正落地。鉴于此,为缓解四川水电跨区消纳与受电区调峰压力之间的矛盾,文中在考虑受电区本地清洁能源消纳和电力系统可调容量基础上,以外送水电负荷追踪能力最大化为目标,构建了四川水电调峰外送方式下的受端电网接纳空间测算模型,以重庆电网为算例,设置汛期高负荷水平日、中等负荷水平日和低负荷水平日3种场景,计算了重庆电网接纳空间水平,然后与四川水电常规外送方式进行比较,结果表明:四川水电调峰外送方式下,3种场景中重庆电网可在其调峰能力之内接纳四川水电54 525 MW·h、31 340 MW·h和22 082 MW·h;四川水电调峰外送情境下,主要承担重庆尖端负荷,削减了电网负荷峰谷差,3种场景中受电区调峰压力分别降低了20%、14%和9%;与四川水电常规外送方式相比,四川水电调峰外送方式有效降低了重庆调峰运行成本,缓和了受电区调峰压力,更有利于电力系统安全经济运行。

At present,most of the researches on the transprovincial consumption of the hydropower from Sichuan Province focus on the maximization of hydropower output,while ignoring the peak load regulation pressure in the receiving power grid.In fact,if the situation of peak load regulation in the receiving area is severe,it is difficult to realize the maximum consumption of hydropower across provinces.In order to alleviate the contradiction between the trans-regional hydropower consumption and the peak load regulation pressure in the receiving area,based on the consideration of the local clean energy consumption and the adjustable capacity of the power system in the receiving area,this paper constructs the calculation model of the acceptance space of the receiving end grid under the mode of Sichuan Hydropower peak shaving and outward transmission,with the maximum load tracking ability as the goal.Taking Chongqing power grid as an example,three scenarios of high load level day,medium load level day and low load level day in the flood season are set to calculate the acceptance space level of Chongqing power grid and then compared with the conventional hydropower transmission mode in Sichuan.The results show that Chongqing power grid can accept 54525 MW·h,31340 MW·h and 22082 MW·h of Sichuan Hydropower within its peak shaving capacity in the three scenarios respectively.In the case of peak load shaving and outward transmission,Sichuan Hydropower mainly undertakes the top load in Chongqing and reduces the peak valley difference of the grid load,thus reducing the peak shaving pressure in the receiving area by 20%,14%and 9%respectively.Compared with the conventional transmission mode,Sichuan Hydropower peak shaving and outward transmission mode can effectively reduce the operation cost of Chongqing peak shaving and ease the pressure of peak shaving in the receiving area,which is more conducive to the safe and economic operation of the power system.