直流闭锁引发交流联络线功率波动的机理以及峰值计算  

Mechanism and peak value calculation of AC tie-line power swing caused by DC blocking

作　　者：屠竞哲[1] 杨莉[1] 黄涌[2] 赵红生[2] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]华中电力科学研究院,湖北武汉430077

出　　处：《电力自动化设备》2013年第1期12-17,共6页Electric Power Automation Equipment

基　　金：国家电网重点科技项目~~

摘　　要：直流闭锁引发交流联络线功率波动本质上是一个阶跃扰动问题,直流闭锁激发出了两区域互联电网的振荡模式,因此应用二阶系统阶跃响应理论进行研究。由于区内直流闭锁和区外直流闭锁故障所对应的阶跃扰动量不同,故分别研究了区内及区外直流闭锁故障引发交流联络线功率波动的机理,给出了功率波动峰值的近似计算方法,总结了影响功率波动峰值的关键因素。以特高压互联电网实际系统为算例,分别采用所提近似计算方法以及电力系统仿真软件对交流联络线功率波动峰值进行了对比计算,结果验证了所提近似计算方法的可行性和正确性。The AC tie-line power swing caused by DC blocking is actually a step disturbance problem,which,because the DC blocking excites the oscillation mode between two interconnected power grids,should be studied with the second-order system step response theory.Since the step disturbance power excited by the interior DC blockings is different from that by the exterior DC blocking,the mechanism of AC tie-line power swings excited by different DC blockings are studied separately.The approximate calculation of AC tie-line power swing peak is given and its influential factors are summarized.The AC tie-line power swing peak is calculated respectively by the proposed approximate calculation and the power system simulation software for a real UHV interconnected power grid,which verifies the feasibility and correctness of the proposed calculation method.

关 键 词：直流闭锁 交流联络线 功率波动 阶跃响应 转动惯量 阻尼比 

分 类 号：TM712[电气工程—电力系统及自动化]