电力系统主导振荡断面的快速判断  

Fast assessment of power system critical oscillation interface

作　　者：潘学萍[1] 敖雄[1] 张丽钦[1] 

机构地区：[1]河海大学电气工程学院,江苏南京210098

出　　处：《电力自动化设备》2009年第12期10-14,共5页Electric Power Automation Equipment

摘　　要：依据扩展等面积准则(EEAC)的分群理论,在发电机采用经典模型、群内机组同调的条件下,推导出电力系统主导振荡模式的估算公式。据此分析了影响振荡频率的主要因素为联络线电抗以及区域等值惯量,并得出系统易发生振荡的主导断面应位于两侧区域惯量最接近的系统联络线上。以10机39节点新英格兰系统为例,将系统主导模式的解析估算频率及分群结果与特征根结果相比较,验证了前者的正确性。进一步以我国实际互联大系统为例,在系统的不同地点设置扰动,用傅里叶方法提取受扰轨线的振荡模式,并将该结果与估算结果相对照,表明根据解析估算结果计算系统的主导振荡频率、判断主导振荡断面的方法可行且简单快速。According to EEAC theory,the analytical formula of swing mode eigenvalues is obtained when the classical generator models are applied and the generators within each cluster are coherent. Based on this formula,it is concluded that,the tie-line reactance and area equivalent inertia are the main effects on oscillation frequency,and the critical inter-area oscillation interface may locate on the tie-line where the area inertia difference between both sides is the smallest. Using the IEEE 39-bus New England system as an example,its validity is verified by comparing the results with the eigenvalues. With the simulations of the national interconnection power grid,it shows that the proposed method is applicable,simple and fast after being compared with the extracted oscillation modes by Fourier transform.

关 键 词：低频振荡 特征根 EEAC理论 主导振荡断面 傅里叶变换 

分 类 号：TM732[电气工程—电力系统及自动化]