摘要
在电力系统暂态稳定计算中,当考虑负荷波动影响时,发电机状态变量具有分布特性。变量的分布特性由其数字特征来描述,例如均值与协方差。利用概率潮流的计算结果确定发电机初始运行状态的分布特性;进而利用小干扰稳定分析中的系统矩阵,系统化表达暂态稳定数值计算中相邻时刻间的变量关系,实现多系统运行方式下的概率暂态稳定分析。所得结果为发电机功角摇摆曲线的分布特性。所述算法在一8机系统上进行了试算。
In the calculation of power system transient stability, generator state variables will possess distribution characteristic when considering the effect of load variation. The distribution characteristic of variables can be described by their numerical characteristics, such as expectation and covariance. The distribution property of generators in initial operating state is determined from the results of probabilistic power flow computation under system multi-operation conditions. Then the coefficient matrix used in small signal stability analysis is applied to systematically describe the variable relationship between adjacent time periods in the transient stability calculation. So the probabilistic transient stability analysis under multi-operation conditions is achieved. Obtained results are the distribution characteristics of generator power-angle swing curves. The proposed approach is examined on an eight-machine system.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第7期7-11,21,共6页
Power System Protection and Control
关键词
暂态稳定
概率
均值
协方差
transient stability
probability
expectation
covariance
