摘要
随着新能源的大规模广泛并网,其对感应电动机动态等值建模的影响值得关注。该文提出了新能源电力系统中感应电动机动态分群新方法。分析了感应电动机与电网的交互作用,提出在现有基于感应电动机动态相似性分群的基础上,同时考虑机端电压动态相似性的分群可提高感应电动机动态等值精度。针对高比例新能源电力系统,研究发现感应电动机附近有新能源机组,且部分新能源机组在故障期间进入低电压穿越(LVRT)时,这些感应电动机动态特性具有显著差异。为此提出新能源电力系统中考虑感应电动机端口电压跌落深度的动态分群方法。算例分析表明,该文提出的兼顾感应电动机端口电压动态相似性以及端口电压跌落深度的分群方法具有较高的等值精度,且适应性强。
With the continuous integration of large-scale of renewable energy,a high share of renewable energy is the main feature of the modern power systems.Since the converter controller of renewable generation has nonlinear modules such as current limiting and switching actions,the dynamic characteristics of the induction motor in the near area will be influenced by them.Therefore when there are a large number of renewable generation in the near area of the induction motor,the dynamic interaction between the renewable energy and the induction motor needs to be considered.However,there are few research on the impact of renewable generation on induction motor equivalent modeling presently.To address this issue,this paper presents a new dynamic clustering method of induction motors in power systems with a high share of renewable energy.Firstly,the interaction between induction motor and power grid is analyzed,which shows that the power system interacts with the induction motor through its terminal voltage.Therefore,considering terminal voltage disturbed trajectories can improve the accuracy of equivalent model.The group-average method is used to quantify the similarity of terminal voltage fluctuation,and the similarity distance is applied to group the induction motors.Based on this,the clustering method that both considers the small disturbance dynamic similarity of induction motor and the dynamic similarity of the terminal voltage is proposed.The ultimate clustering result is obtained by dividing the intersection of the clustering results obtained by the two methods into a new group and the rest into a new group.For the power systems with a high share of new energy,it is found that when there are renewable energy near the induction motors in the same cluster,and some of these renewable energy enters into the low voltage ride through(LVRT)during the fault,the dynamic characteristics of the induction motors in the same group will have significant differences.Therefore,a dynamic clustering method considering the voltage drop
作者
潘学萍
王卫康
陈海东
孙晓荣
郭金鹏
Pan Xueping;Wang Weikang;Chen Haidong;Sun Xiaorong;Guo Jinpeng(College of Energy and Electrical Engineering,Hoahi University Nanjing 211100 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第7期2001-2016,2032,共17页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(52077061)。
关键词
感应电动机
动态等值
新能源电力系统
动态相似性
低电压穿越
Induction motor
dynamic equivalence
new energy power system
dynamic similarity
low voltage ride through(LVRT)
