摘要
变速抽蓄机组是潜在的大容量、灵活可靠、清洁一次调频资源。缺乏频率响应机理模型和性能研究导致定量表达、挖掘、充分发挥该机组一次调频优势遇到瓶颈。提出了一种变速抽蓄机组频率响应机理模型,并基于该模型量化分析了变速抽蓄机组较常规机组、定速抽蓄机组在调频稳定性与动态性能两方面的优势。首先基于调频物理本质,建立了变速机组发电和抽水2种工况下的频率响应模型;其次利用根轨迹法分析了频率下垂系数对3种机组调频稳定性的影响;然后推导了3种机组对应的调频性能指标,并比较了一次调频动态性能;最后通过PSCAD/EMTDC时域仿真验证了机理模型和性能分析的正确性。该研究结果为充分利用变速机组来保障新型电力系统频率稳定提供了有益的理论参考。
Adjustable-speed pumped storage unit(ASPSU)is an environmentally-friendly solution for primary frequency control in terms of its massive scale and reliability.Frequency response mechanism modeling and performance analysis of the ASPSU facilitate a better understanding and utilizing its merits for primary frequency control,which have been studied inadequately though.This study aims to derive a frequency response mechanism model of the ASPSU and to quantitatively analyze its superiority in frequency regulation performances to those of the thermal power unit and the fixed-speed pumped storage unit.Firstly,it is presented that the frequency response mechanism model of the ASPSU under the turbine and pumping modes.Then,it is figured out that the influence of droop coefficient on the frequency regulation stability of the three units respectively by the root locus method.Furthermore,the key dynamic indices are calculated when the three units contribute to the primary frequency control respectively.Finally,the model and performance analyses are validated by the PSCAD/EMTDC software.This study helps to make full use of the ASPSU to ensure the frequency stability of the new power system.
作者
朱珠
潘文霞
刘铜锤
刘明洋
ZHU Zhu;PAN Wenxia;LIU Tongchui;LIU Mingyang(College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,Jiangsu Province,China;College of Electrical Engineering,Tongling University,Tongling 244061,Anhui Province,China;State Grid Ningbo Power Supply Company,Ningbo 315200,Zhejiang Province,China;State Grid Henan Electric Power Research Institute,Zhengzhou 450052,Henan Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2023年第2期463-472,共10页
Power System Technology
基金
111引智计划“新能源发电与智能电网学科创新引智基地”资助项目(B14022)
安徽省高校自然科学研究重点项目(KJ2021A1057)
江苏省研究生科研创新项目(KYCX21_0475)。
关键词
变速抽蓄机组
一次调频
机理模型
调频性能分析
adjustable-speed pumped storage unit
primary frequency control
mechanism model
performance analysis
