浙江电力2024，Vol.43Issue(2)：25-33,9.DOI:10.19585/j.zjdl.202402003
火电机组交互影响对次同步振荡的作用机理研究
Study on the mechanism of interaction between thermal power units on subsyn-chrouns oscillation
摘要
Abstract
Research findings indicate that in multi-unit systems experiencing subsynchronous oscillations(SSO),the units tend to exhibit similar torsional vibration frequencies.Therefore,an analysis was conducted on the interac-tive effects among shaft systems of units with similar frequencies,as well as the mechanisms of system series com-pensation,electrical distances between units.Additionally,the paper delved into the mechanisms through which system series compensation,electrical distances between units,and similar torsional vibration frequencies impact the SSO.Firstly,based on characteristic matrices,the expression for the complex torque coefficients of two parallel thermal power units in the system was derived.Subsequently,the simplified complex torque coefficient method for a single unit was extended to encompass multi-unit systems,resulting in a streamlined expression for the electrical damping of dual thermal power units.The analysis further examined the influence of other units on the damping of the target unit,revealing that series compensation,electrical distances between units,and similar torsional vibra-tion frequencies all exert an influence on system damping and stability.Finally,the mechanisms through which in-fluencing factors affect the subsynchronous stability of the system were validated through numerical examples.关键词
次同步振荡/相近扭振频率/简化复转矩系数/交互影响/电气阻尼Key words
SSO/similar torsional vibration frequency/simplified complex torque coefficient/interactive effects/electrical damping引用本文复制引用
臧德春,赵荣臻,杨超,祝新驰..火电机组交互影响对次同步振荡的作用机理研究[J].浙江电力,2024,43(2):25-33,9.基金项目
中国电力科学研究院有限公司科技项目(2021YFB2400805) （2021YFB2400805）
