水电站日调峰能力计算方法研究

Research on the Calculation Method of Daily Peaking Capacity of Hydropower Stations

水电站日调峰能力是衡量水电站的主要性能指标之一,在水、风、光电联合的电网调度中具有重要意义。从调峰幅度和调峰电量两方面定义了水电站日调峰能力的概念,并基于四种固定形状的典型日负荷图及一种通用的典型日负荷图开展了水电站日调峰能力的计算。针对固定形状的典型日负荷图给出了在给定调峰时间下的水电站最大调峰幅度的计算方法,针对通用的典型日负荷图给出了日最大调峰电量的计算方法。以红水河中下游四座具有不同调节性能的水电站水库为研究对象,分别计算了在五种典型日负荷图下各水库在不同初水位和不同日均入库流量时的调峰能力。结果表明,对具有季调节和年调节等调节能力强的水电站,其日调峰能力的大小主要受库水位的影响,而与日均入库流量的关系不大。对日调节水电站,在入库流量较小时,其日调峰能力受日初水位和日均入库流量的影响较大;当入库流量达到一定值后,日初水位对日调峰能力的影响较小。在平均入库流量和初水位确定的情况下,可以定量求出水电站的最大调峰幅度和最大调峰电量及相关运行数据,便于水电站最大化参与电网调峰。研究所提出的水电站日调峰能力的概念客观全面,所建立的日调峰能力计算方法具有较强的实用性和可操作性,可为水电站日调峰能力的确定提供科学依据。

The daily peaking capacity is one of the main performance indicators of hydropower station which is of great significance in the grid scheduling of combined water,wind and photovoltaic power.This paper defines the concept of daily peaking capacity of hydropower station from the aspects of peaking magnitude and peaking power,and calculates the daily peaking capacity of hydropower stations based on four typ⁃ical daily load diagrams of fixed shapes and a generalized typical daily load diagram.For the typical daily load diagrams of fixed shapes,the calculation method of the hydropower stations’maximum peaking magnitude under the known peaking time is given.For the generalized typical daily load diagram,the calculation method of the maximum peaking power is given.Four reservoirs of hydropower plants with different regulation performance in the midstream and downstream of the Hongshui River were used as research objects.The peaking capacity of each reservoir was calculated at different initial water levels and different average daily inflow under five different typical daily load diagrams.The results show that For hydropower stations with strong regulating capacity such as seasonal and annual regulation,their daily peaking capacity is mainly affected by the reservoir water level,while the average daily inflow has little effect on it.For daily regulated hydropower stations,when the inflow is small,the daily peaking capacity is greatly affected by the daily initial water level and the daily average inflow.When the inflow reaches a certain value,the daily initial water level has less influence on the daily peaking capacity.When the average inflow and ini⁃tial water level are determined,the maximum peaking amplitude and maximum peaking power of the hydropower station as well as related op⁃eration data can be quantitatively derived,which facilitates the optimal effect of the hydropower station to participate in the grid peaking.The concept of daily peaking capacity of hydropower station proposed in this paper is objective and comprehensive.The established method of cal⁃culating daily peaking capacity has strong practicality and operability which can provides scientific basis to determine the daily peaking ca⁃pacity of hydropower station.