摘要
现有的奇异摄动降阶方法无法确保直驱风电场(direct drive wind farm,DDWF)降阶系统与全阶系统具有一致的次同步振荡(sub-synchronous oscillation,SSO)特性,故降阶系统无法应用于DDWF并入弱电网系统的SSO分析之中。针对这一问题,该文提出一种基于主导度分析的DDWF奇异摄动降阶方法。该方法以DDWF系统SSO模式保留为导向,以复现全阶系统动态特性和SSO特性为最终目标,实现DDWF系统的降阶。首先,在兼顾系统特征值和系统能控能观性的前提下,通过主导度分析,量化各振荡模式对DDWF系统动态特性的主导程度。然后,根据给出的保留模式确定原则,建立包含DDWF系统主导振荡模式和全部SSO模式的保留模式集合;再对各保留模式进行参与因子分析,完成DDWF系统多时间尺度划分。最后,建立10阶DDWF奇异摄动降阶系统,最大限度地提高系统仿真效率。以单DDWF和两DDWF并入弱电网系统作为仿真算例,验证所提降阶方法的有效性。
The existing singular perturbation approximation methods can not ensure that the reduced-order direct drive wind farm(DDWF)has the same sub-synchronous oscillation(SSO)characteristics as the full-order DDWF,so the reduced-order DDWF can not be applied to the SSO analysis of DDWF connected to weak AC system.To solve this issue,the singular perturbation approximation method based on the dominant degree analysis for DDWF was proposed.This method was guided by keeping SSO modes of DDWF,and the ultimate goal was to make the reduced-order DDWF reproduce the dynamic characteristics and SSO characteristics of full-order DDWF.Firstly,the influence of each mode on the dynamic characteristics of DDWF was quantified by the dominant degree analysis.The effects of the eigenvalues,the system controllability and the system observability were fully considered during this process.Secondly,according to the principles of establishing the retained mode set,the retained mode set including all SSO modes and dominant oscillation modes was established.Then,based on the factor participations analysis of retained modes,the multi-time scale division of full-order DDWF was completed.Finally,the 10-order DDWF was established and the simulation efficiency was improved.The simulation examples of single DDWF connected to weak AC system and two DDWFs connected to weak AC system verify the effectiveness of the proposed method.
作者
高本锋
王刚
邵冰冰
刘毅
向玲
赵书强
GAO Benfeng;WANG Gang;SHAO Bingbing;LIU Yi;XIANG Ling;ZHAO Shuqiang(Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province(North China Electric Power University),Baoding 071003,Hebei Province,China;Mechanical Engineering Department,North China Electric Power University,Baoding 071003,Hebei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第7期2449-2461,共13页
Proceedings of the CSEE
基金
国家自然科学基金项目(51507064)。
关键词
主导度分析
奇异摄动理论
直驱风电场
次同步振荡
降阶
dominant degree analysis
singular perturbation theory
direct drive wind farm(DDWF)
sub-synchronous oscillation(SSO)
order reduction
