摘要
电力系统恢复初期由于系统阻尼较小,机组调节能力有限,在恢复主变的过程中对其空充电将导致薄弱小系统并网机组功率的波动。针对此问题,从系统恢复初期电网模型的等值电路出发,分析了线路长度、功率因数及主变铁心饱和导致的系统有、无功负荷变化之间的关系,得出系统有功负荷为主变铁心饱和程度的单调增函数,无功负荷为其单调减函数的变化规律并提出了相应的控制建议。最后通过系统仿真证实了该结论的正确性和有效性,为系统恢复初期的恢复策略制定及评估提供有益的指导。
In the initial period of power system restoration ,b ecause the system damping is small and the generator unit regulating ability is limited, t he power fluctuation will appear in the small weak system when charging no-load transformer.This phenomenon is studied by the equivalent circuit of initial period of power system restoration and the relations of the change of system active and reactive load resulted from line length, power factor and transformer core saturation degree are analyzed.The conclusion that the active power is monotone increasing function of core saturation degree and the reactive power is monotone decreasing function of core saturation degree is deduced and correlated measures to solve the problem are proposed.At last, the correctness and effectiveness are verified by simulation. The method proposed supplies available guide for the plan and assessment of the restoration. This work is supported by National Natural Science Foundation of China（No.50977059）.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第19期203-207,211,共6页
Power System Protection and Control
基金
国家自然科学基金项目(50977059)
关键词
系统恢复
铁心饱和
功率波动
变压器
励磁涌流
power system restoration
transformer saturation
power fluctuation
transformer
inrush currents
