CAJ | 학술논문

广域测量系统的历史数据中统计的电网每日发生有效扰动次数的突然变化能够反映系统的稳定水平的变化,因此研究并从理论上给出扰动概率和阻尼比的数学关系对分析和评估电网的稳定性具有重要意义.基于此,在分析了计及网络中功率扰动的小干扰计算的基础上,通过分析联络线对扰动的响应,推导得出了联络线功率波动幅值与阻尼比的解析关系.然后,基于扰动服从正态分布的假设给出扰动概率与阻尼比的关系式.最后以 10机39节点系统为例进行算例分析,验证了推导得出的联络线振荡幅值解析表达式的正确性和分析了联络线功率扰动概率与阻尼比的关系.研究结果可为广域测量系统历史统计数据的分析及电网稳定性评估提供理论参考.
엄역측량계통적역사수거중통계적전망매일발생유효우동차수적돌연변화능구반영계통적은정수평적변화,인차연구병종이론상급출우동개솔화조니비적수학관계대분석화평고전망적은정성구유중요의의.기우차,재분석료계급망락중공솔우동적소간우계산적기출상,통과분석련락선대우동적향응,추도득출료련락선공솔파동폭치여조니비적해석관계.연후,기우우동복종정태분포적가설급출우동개솔여조니비적관계식.최후이 10궤39절점계통위례진행산례분석,험증료추도득출적련락선진탕폭치해석표체식적정학성화분석료련락선공솔우동개솔여조니비적관계.연구결과가위엄역측량계통역사통계수거적분석급전망은정성평고제공이론삼고.
The daily statistics of valid disturbances recorded in the historical data of the wide-area measurement system (WAMS) can reflect the stability level of a power grid. The formulas of the small signal analysis including power disturbance on the grid is given firstly; then the relationship between damping ratio and response of the oscillation magnitude of the tie-line active power is analyzed; and the relationship of the oscillation probability and damping ratio is obtained. Finally, a case study based on 10-machine 39-bus power system verifies the validity of the expression of oscillation amplitude of tie-line active power and the relationship between the oscillation probability and damping ratio. These theoretical results can be used to guide the power operator to assess the damping level of the power grid based on the daily oscillations number recored by WAMS. This work is supported by National Natural Science Foundation of China (No. 51207063).