摘要
以四川电网2010年丰大运行方式德宝直流单极运行为背景,重点研究直流功率调制对四川电网小干扰稳定性的影响。根据可观性指标选取断面功率作为直流附加控制器的输入信号,能够有效反映区域间的低频振荡信息。通过比较分析典型故障下各种运行条件的系统特性以及主振模式的Prony辨识结果,表明德宝直流系统的大、小方式直流调制可以显著提高系统的区域间阻尼。为了校验参数的鲁棒性,在系统各种运行方式下进行大量的时域仿真,结果表明它能够与电网中现有PSS协调作用达到共同抑制四川电网低频振荡的目的。
Taking Sichuan power grid in the summer peak load period of 2010 for background, while Debao HVDC system operating in monopolar mode, this paper focuses on the impact of DC power modulation on small signal stability in Sichuan power grid. First of all, according to the observability index, intertie power flow is selected as the controller input signal, which can effectively reflect the inter-area low frequency oscillation information. After comparative analysis of the system characteristics of various operating conditions under typical faults as well as the Prony identification results of the main vibration mode, it indicates that the large and small mode DC modulation of the Debao HVDC system can significantly improve the inter-area damping. Finally, a great deal of time domain simulation is accomplished in order to check the robustness of the parameters. Results show that DC power modulation is able to damp the low frequency oscillation of Sichuan power grid with the coordination of the existing PSS.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第23期141-146,共6页
Power System Protection and Control
基金
国家科技支撑计划项目(2008BAA13B01)
关键词
直流功率调制
小干扰稳定性
区域间阻尼
低频振荡
DC power modulation
small signal stability
inter-area damping
low frequency oscillation
