摘要
针对发电机参数辨识,采用五种不同的观测变量进行对比研究,即发电机相对功角、发电机端口电压相对相角、联络线有功功率、联络线无功功率以及枢纽母线电压。首先对比研究了灵敏度的相位即是否同时过零点,结果表明有可能相同参数对于某个观测变量的灵敏度同时过零点,而对于另一个观测变量却不同时过零点。其次对比研究了灵敏度的大小,结果表明灵敏度大小依次为发电机相对功角、发电机端口电压相对相角、联络线有功功率、联络线无功功率以及枢纽母线电压。然后对比研究了参数的辨识精度,结果表明以发电机相对功角作为观测变量得到的辨识精度最高。因此,应该选择灵敏度相位不同、幅值较大的变量作为观测变量。
This paper compares five observed variables for the parameter identification of generators, i.e. the relative rotor angle between the generators, the relative phase angle of generator port voltage, the active powers through the tie-lines, the reactive powers through the tie-lines and the voltages at the key buses. The comparative results of trajectory sensitivity phase show that the generator parameters may be identifiable with an observed variable but unidentifiable with another variable. The comparative results of trajectory sensitivity magnitude indicate that the relative rotor angle behaviors the largest sensitivity, and then the relative phase angle of generator port voltage, the active powers through the tie-lines, the reactive powers through the tie-lines and the voltages at the key buses sequentially. The comparative results of parameter estimation precision show that the best one is the relative rotor angle. Therefore, the variables with no in-phase and large sensitivity could be selected.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第10期24-29,共6页
Power System Protection and Control
基金
国家自然科学基金重点项目(51137002)
江苏省普通高校研究生科研创新计划项目(CX10B_204Z)~~
关键词
电力系统
同步发电机
参数辨识
轨迹灵敏度
观测变量
electric power systems
synchronous generators
parameter identification
trajectory sensitivity
observed variables
