摘要
严格推导了发生功率冲击时两区域互联系统联络线功率振荡的表达式。将发生功率扰动的系统分为扰动前、扰动瞬间和扰动后3个阶段,建立每个阶段的动态方程并推导运行点的变化。基于冲击功率的分配理论,推导了两区域互联系统在发生功率扰动后联络线功率的变化。扰动后,联络线功率呈现出区间振荡模式的衰减振荡,功率稳态值由两区域内发电机的总惯性时间常数确定,同时得到了类似于二阶系统阶跃响应的功率振荡表达式和第一摆功率峰值的计算式。数值仿真以及华北-华中互联系统掉机事故分析验证了结果的有效性。
The tie-line power oscillation of the two-area interconnected system due to power impacts is strictly derived. The power oscillation process caused by disturbance is divided into three stages, namely before, during and after the disturbance, and dynamic equation for each stage is established and the variation of the state point is derived. Based on the theory of distribution of impact powers in power systems, the tie-line power of the two-area system after power impacts is analysed. After the disturbance, the tie-line power takes on damped oscillation of inter-area low-frequency oscillation mode, and the steady-state power depends upon the total inertia time constant of the generators in both areas, meanwhile the expression of power oscillation similar to step response of second-order system is derived and the formula for the peak power during the first swing, which is mainly determined by the ratio of total inertia time constant of both areas and the damping ratio of the inter-area oscillation mode, is obtained. The effectiveness of the proposed equations is verified by numerical simulations and the analysis on the generator-tripping contingency of North China and Central China interconnected system.
出处
《电网技术》
EI
CSCD
北大核心
2011年第10期53-58,共6页
Power System Technology
关键词
互联系统
联络线
冲击功率
功率波动
阻尼比
interconnected system
tie-line
impact power
power oscillation
damping ratio
