基于机组出力调整的小干扰稳定辅助决策计算  

Small-signal Stability Auxiliary Decision-making Calculation Based on Power Generation Adjustment

作　　者：鲍颜红[1,2,3] 徐伟[2,3] 徐泰山[2,3] 郑伟[2,3] 方勇杰[2,3] 

机构地区：[1]华北电力大学电气与电子工程学院,北京市102206 [2]国网电力科学研究院 [3]南京南瑞集团公司,江苏省南京市210003

出　　处：《电力系统自动化》2011年第3期88-91,共4页Automation of Electric Power Systems

摘　　要：小干扰稳定辅助决策根据状态估计结果和元件模型参数在线计算机组出力调整措施,以提高弱阻尼模式的阻尼至指定安全值,从而抑制低频振荡。具体方法为:将参与因子作为机组出力调整的性能指标,避免额外的计算时间;根据模态相角将机组分为2群,通过功率摄动法确定2群机组的出力调整方向;根据频率和机组的分群信息确定控制后的模式阻尼;结合机组在不同模式中的参与因子和出力调整方向确定协调控制时的出力调整方向;采用灵敏度法分别计算提高单个模式阻尼的机组出力调整措施;采用给定范围的特征值计算校核合并后的控制措施,确定控制措施的有效性,同时协调控制多个弱阻尼模式的机组出力调整措施。在某大区电网的应用实例,验证了所提出的小干扰稳定辅助决策计算方法的有效性。Small-signal stability auxiliary decision-making is the method that determines the online power generation adjusting actions according to the results of state estimation and the parameters of element model in order to improve the damping of the weekly damped mode to assigned security to damp the low-frequency oscillation.In this method,participation factor is adopted as the performance index to adjust power generation so as to avoid extra calculation time;generators are divided into two clusters based on the angle of mode shape and the adjusting direction of two clusters is confirmed by power perturbation method;the corresponding damping mode after generation adjusting is ascertained according to the frequency and cluster information;the direction of generation adjustment actions for coordinated control is determined by the participation factors and the direction of generation adjustment actions of different modes,and sensitivity method is used to determine the generation adjustment actions for a single mode;the merged actions are corrected through a range given eigenvalue calculation in order to validate the control actions,then the generation adjustment actions for coordinated control of multi-weekly damped modes can be obtained.Applications in a real large power grid verify the proposed method.

关 键 词：机组出力 小干扰稳定 辅助决策 特征值 参与因子 模态 

分 类 号：TM744[电气工程—电力系统及自动化]