金沙江下游梯级受端电网消纳空间分析方法

Power Consumption Space Analysis Method of Receiving Power Grid for Cascaded Hydropower Stations in the Downstream of Jinsha River

摘要: 特大流域水电站群跨省跨区送电与受端负荷需求、本地电源特点等密切相关，需要准确分析不同时空的电网平衡需求以确定合理的消纳空间。本文以金沙江下游梯级送电工程为背景，考虑受端电网调峰和本地清洁能源消纳需求，提出电量消纳空间分析方法。该方法以受端火电机组为调节单元，其他类型电源采用典型运行方式，利用逐月典型日电力电量平衡理论分别构建受端电网最小、最大消纳电量的混合整数线性规划模型。以某受端电网为对象分析确定全年逐月省外电量消纳能力，并与2021年实际受电量对比。结果表明，除2月外各月省内供电能力均难以满足用电需求，1月、6~8月、12月负荷大，具有较强的省外电量消纳能力，且实际受电量处于消纳空间中位值，验证了最大、最小消纳边界的有效性，为合理安排梯级水电站送电计划提供了决策支持。

Abstract: The cross provincial and cross regional power transmission of large hydropower stations in a river basin is closely related to the load demand of the receiving power grid and the characteristics of local power sources. It is necessary to accurately analyze the load balancing demand for power grid of different time and space to determine appropriate consumption space. This article takes the actual power transmission project of cascade hydropower stations in the downstream of Jinsha River as background, and proposes analysis method for power consumption space considering the peak shaving of the receiving power grid and the demand of local clean energy consumption. This method takes the thermal units of the receiving power grid as the regulating unit, while other types of power sources use typical operating methods. By balancing the typical daily electricity consumption each month, mixed integer linear programming models for the minimum and maximum consumption of the receiving power grid are constructed to analyze and determine the monthly electricity consumption capacity of receiving power grid, and compare it with the actual electricity received from outside the province in 2021. The results indicate that the local power supply capability is difficult to meet the electricity demand in all months except February. The loads in January, from June to August, and December are large, so that the ability to consume power from outside the province in these months is strong, and the actual electricity received from outside the province of the power grid is at an intermediate level of consumption space. The results confirm the validity of the maxi-mum and minimum consuming boundary and provide decision-making support for the suitable arrange-ment of the transmission plans for cascade hydropower stations.