摘要
现有的动态等值算法在发电机同调等值中没有计及电动机负荷动态特性对发电机的影响,其应用受到很大限制。从源?网?荷的角度提出一种能整体上评价各机组中发电机?电动机的动态特性的新方法。首先由系统初始潮流状态确定发电机?电动机研究子系统;然后利用戴维南等值参数将系统等值为2机系统,采用电气距离指标衡量两机之间的耦合强弱;再根据特征值分析法计算子系统中电动机特征值;最后应用距离最短法对各子系统中电气距离和特征值指标进行聚类分析,得到最终分群方案。通过对EPRI-36节点系统进行仿真,并与三取二法、离散Fréchet距离法分群结果进行对比分析,验证了其有效性。该算法能计及电动机负荷动态特性,物理意义明确,计算量小,实用性很强,尤其适合大规模互联电力系统。
Existing dynamic equivalence algorithms do not take dynamic characteristics of motor load effecting on generator into consideration in process of coherent equivalence and therefore its application is limited greatly.From view of source-grid-load,this paper proposes a new method for evaluating generator-motor dynamic characteristic of each unit comprehensively.Firstly,generator-motor subsystem can be determined according to power flow.Secondly,using Thevenin equivalent parameters,whole system can be equivalent to a 2 machine system.Adopting electric distance,coupling strength between the 2 machines can be measured.Then through eigenvalue analysis,eigenvalue of each motor in subsystem can be obtained.Finally,according to the shortest distance method and clustering analysis based on electric distance of generator and eigenvalue of motor,clustering results are achieved.With EPRI-36 bus system simulation and comparison with result of two-from-three method and discrete Fréchet distance method,effectiveness of the proposed method is validated.In this algorithm,dynamic characteristics of motor loads combined with generator are taken into consideration.It characterized with clear physical significance,small amount of calculation and high application value.It is suitable to large-scale interconnected power system especially.
出处
《电网技术》
EI
CSCD
北大核心
2016年第5期1442-1446,共5页
Power System Technology
基金
国家自然科学基金项目(51577053)~~
关键词
动态等值
戴维南等值
电动机负荷
电气距离
特征值分析
聚类分析
dynamic equivalence
Thevenin equivalence
motor loads
electrical distance
eigenvalue analysis
clustering analysis
