变速水力发电机组低电压穿越中机组转速上升率的计算及其影响分析  

Calculation and Impact Analysis of Unit Speed Rise Rate in Low Voltage Through of Variable Speed Hydropower Turbine Units

作　　者：苏立 毛成 文贤馗 沈春和 谢文经 戴利传 曾癸森 SU Li;MAO Cheng;WEN Xiankui;SHEN Chunhe;XIE Wenjing;DAI Lichuan;ZENG Guisen(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China;Guizhou Qianneng Enterprise Co.,Ltd.,Guiyang 550000,Guizhou,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [2]贵州黔能企业有限责任公司,贵州贵阳550000

出　　处：《电网与清洁能源》2024年第2期149-154,共6页Power System and Clean Energy

基　　金：贵州省科技支撑计划项目([2020]2Y042);南方电网有限责任公司科技项目(GZKJXM200200680)。

摘　　要：因其优良的调节性能,变速水力发电机组对消纳间隙性与随机性强的新能源具有重要意义,受到行业的广泛关注;在电网低电压故障过程中变速机组的转速具有短时间上升的现象,对机组低电压穿越过程中的转速上升率进行计算,并对其加以抑制是保障机组安全运行的重要条件之一。该文通过建立,以及在恰当的假设条件下简化、求解变速水力发电机组的数学模型,得到机组转速上升率的解析表达式;通过分析机组转速上升率对各主要参数的敏感性,设计机组低电压穿越时的导叶控制策略;通过数值计算与对比,验证调速器策略,有效降低了机组低电压穿越过程中的机组转速上升率。Due to its excellent regulation performance,variable-speed hydropower turbine units are of great significance in consuming new energy with strong intermittency and randomness,and have received widespread attention in the industry.The speed of the variable-speed unit will rise in a short time in the process of low voltage of the power grid.Calculating the speed rise rate during the low voltage ride through process of the unit and suppressing it is one of the important conditions to ensure the safe operation of the unit.This paper establishes and simplifies the mathematical model of variable speed hydroelectric power generation units under appropriate assumptions to obtain an analytical expression for the rate of speed rise of the unit.A guide vane control strategy for low voltage ride through of the unit is designed by analyzing the sensitivity of the unit speed rise rate to various main parameters.By numerical calculation and comparison,the governor strategy is verified to effectively reduce the speed rise rate of the unit during the low voltage ride through process.

关 键 词：水力发电机组 变速运行 低电压穿越 转速上升率 控制策略 

分 类 号：TM312[电气工程—电机]