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正规形理论在电力系统稳定性研究中的应用(四)--复杂电力系统的稳定边界研究
李颖晖,张保会
作者单位
摘要:
正规形理论应用于电力系统的暂态稳定性分析中,可以依据所采用的非线性变换的阶数对电力系统故障后的主导不稳定平衡点上的稳定流形作几阶近似,从而得到某阶近似的电力系统稳定边界的解析式。更进一步地,可以得到系统的极限切除时间。以新英格兰系统为例,推导了四阶近似的局部稳定边界的解析表达,计算了几种故障情况下的极限切除时间,与逐步积分法的比较结果表明采用四阶近似的稳定边界是较精确的。
关键词:  电力系统暂态稳定边界 局部稳定流形 极限切除时间
DOI:
分类号:TM712
基金项目:高等学校博士学科点专项科研项目,RFDP-98069814,
Application of normal form in study of power system stability Part 4:Study on stability boundary of complex electric power system
LI Ying-hui 1  2  ZHANG Bao-hui 3
Abstract:
In the application of normal form theory to electric power system transient stability analysis,the stable manifolds on a controlling unstable equilibrium point of a post-fault system can be approximated according to the order of nonlinear transformation taken to the system.The ap-proximated stability boundary of electric power system in that particular order is then obtained,and th e critical clearance time is further gotten.With New England power system as an example,the analytic expression of fourth-order approximated stability boundary and the critical clearance times under several fault cases are calculated.Compared with the step-by-step method,the results show that the fourth-order approximated stability boundary is comparatively accurate.
Key words:  transient stability boundary of electric power system,local stable manifolds,critical clearance time

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