摘要
随着PMU/WAMS的广泛应用,基于广域响应的电力系统失稳预测已成为研究热点之一。分析了双机等值系统中机群相对功角与振荡中心电压的物理联系,并根据受扰功角轨迹可采用多项式模型进行拟合外推的特点,提出1种基于多项式模型的电压受扰轨迹快速预测方法。当电网发生机群间暂态失稳时,根据系统振荡中心附近的受扰最严重测点进行电压轨迹快速预测,并采用预测轨迹提前获知系统失稳信息。通过IEEE-39系统和浙江电网交直流电网实际系统算例验证,表明该方法计算快速、预测精度高,可提高暂态失稳判别的时效性,为紧急控制的开展争取宝贵时间。
As PMU/WAMS are widely used,wide-area response based system instability prediction has become a hot issue. According to the equivalent system of two machines,the relationship between perturbed relative angle and the voltage amplitude of oscillation center is discussed. In virtue of the angle trajectory that can be predicted with fitting extrapolation on polynomial model,a novel perturbed voltage trajectory prediction method is proposed. While transient instability occurs between generator groups in power grid,voltage measurement near the oscillation center can be used to detect the transient instability in advance. Numerical simulations are conducted in IEEE 39-bus system and Zhejiang AC/DC hybrid power grid. The results show that the proposed method can accurately predict the voltage trajectory and identify the instability quickly. It will save the timeliness of instability identification for emergency control.
出处
《智慧电力》
2017年第11期85-90,共6页
Smart Power
基金
国家电网公司科技项目(521104170013)~~
关键词
暂态失稳
广域量测
受扰电压轨迹
多项式模型
轨迹预测
transient instability
wide area measurement
perturbed voltage trajectory
polynomial model
trajectory prediction
