可变速抽水蓄能机组大波动工况转速上升规律  

Simulations and analysis of speed rising of variable-speed pumped storage units under large disturbances

作　　者：周喜军 丁景焕 黄一凡 杨威嘉[2] 杨桀彬[2] 杨建东[2] ZHOU Xijun;DING Jinghuan;HUANG Yifan;YANG Weijia;YANG Jiebin;YANG Jiandong(Technology Center of State Grid Xinyuan Company Ltd.,Beijing 100761;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072)

机构地区：[1]国网新源控股有限公司技术中心,北京100761 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《水力发电学报》2021年第8期57-64,共8页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(52079096,51879200)。

摘　　要：可变速抽水蓄能技术已经成为近年来抽水蓄能行业新兴的发展与研究方向,可变速抽水蓄能电站运行的动态特性研究意义显著。本文利用可变速抽水蓄能电站的非线性数学模型,重点对其中的水力-机械子系统进行了研究。通过将模型在事故甩负荷工况下的计算仿真结果与真实电站的实测结果对比,验证了模型的准确性。本文对可变速抽水蓄能机组在事故甩负荷工况时不同起始转速下的动态响应进行了仿真分析,研究了机组转速上升规律,并分析了该规律产生的原因在于机组的力矩特性与机组的动量转换关系。结果表明:对于可变速抽水蓄能机组的事故甩负荷工况,起始转速在一定范围内增加时,机组最大转速并不会显著增加。Variable-speed pumped storage technology has become an emerging development and research direction in pumped storage industry in recent years,and research on the dynamic characteristics of variable-speed pumped storage power plants(VSPSPs)is of great significance.This paper focuses on the hydraulic-mechanical subsystem of a VSPSP and analyzes the rising trends of its unit speed during load rejection transient process,by using a nonlinear integrated model.We verify the correctness of the model by comparing its simulation results under load rejection against the on-set measurements of a real power station,analyze the dynamic response and speed rising of the unit under load rejection at different initial speeds,and find the speed rising can be explained through its momentum conversion mechanism and torque characteristic.The results demonstrate that under load rejection,if the initial speed of the variable-speed unit increases in a certain range,the maximum speed will not grow significantly,and there still exists a certain safety margin from the maximum allowable speed.

关 键 词：可变速抽水蓄能电站 水泵水轮机特性曲线 大波动工况 转速上升规律 过渡过程轨迹线 力矩积分与转速上升 

分 类 号：TV743[水利工程—水利水电工程]