水力发电灵活性对混合电力系统的调节影响  

Hydro flexibility in regulating power fluctuation of hybrid system

作　　者：李欢欢 陈帝伊[1] 许贝贝[1] LI Huanhuan;CHEN Diyi;XU Beibei(College of Water Resources & Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《排灌机械工程学报》2022年第2期157-163,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：陕西省自然科学基金资助项目(2019JLP-24);陕西省水利科技项目(2018slkj-9)。

摘　　要：鉴于风功率的随机性造成电网净负荷在多时间尺度上波动的特点,从时-频角度出发,基于风-水联合发电仿真模型,采用形态学滤波方法提取了风-水联合发电系统中净负荷的高、中、低频信息,通过建立的灵活性评价指标有效反映电力系统的上行和下行灵活性的供需关系.同时,为解决系统灵活性不足的问题,研究了风电渗透比例和水电机组备用接入比例对改善系统灵活性的影响规律,确定了最适宜的风电渗透比例和备用接入比例.研究显示:风-水联合系统在中、低频尺度上只存在下行灵活性不足的问题,其灵活性不足容量在49%风电渗透比例下最大可达4.961 MW;而在高频尺度上同时存在上、下行灵活性不足的运行风险,相应的上、下行灵活性不足容量最大可达0.1252 MW和4.2791 MW.此外,针对文中互补发电系统,其最适宜的水电备用接入比例为85%.In terms of the fluctuation of net load caused by stochastic wind power in multi-time scales,the morphologic filter method was used to extract the signal of net load with the high,medium and low frequencies.Then,the flexible indices were presented to describe the supply-demand relationship of hybrid power system in multi-time scales.To improve flexibility benefits,the optimal permeation ratio of wind power and the use ratio of hydro reserve capacity were also analyzed and determined in different time scales.The results show that the down-regulation hydro capability is insufficient in the medium and low frequencies,and the corresponding insufficient capacity is able to reach 4.961 MW in 49%of wind proportion.In contrast,there exists the insufficient up-and down-regulation for hydro resource in the high frequency,and the corresponding maximums of insufficient up-and down-capacities are 0.1252 MW and 4.2791 MW.Additionally,the most suitable proportion of the use ratio of hydro reserve capacity for this system is 85%.

关 键 词：水轮机调节系统 风力发电系统 水电备用容量 灵活性 多时间尺度 

分 类 号：TK73[交通运输工程—轮机工程] S277.9[动力工程及工程热物理—流体机械及工程]