基于能量角度的共振机理电力系统低频振荡分析

电力系统共振机理低频振荡，即由于扰动的频率与系统自然振荡频率共振而发生的系统大幅度功率振荡，已被证明可较好地解释实际系统中发生的一些非负阻尼机理功率振荡。作者从能量角度分析了电力系统在发生共振机理低频振荡过程中内、外能量的变化关系和特征。采用仿真软件Matlab对河北南网安保线的功率振荡进行了仿真和能量分析，其结果可更清晰地展示振荡的物理过程，有助于更好地理解和认识电力系统共振机理低频振荡。

Analysis on Power System Low Frequency Oscillations Originated in Resonance Mechanism from Viewpoint of Energy

According to power system resonancemechanism, low frequency high amplitude power oscillationcould be triggered off while the frequency of sustained cyclicsmall disturbance coincides with that of power system naturaloscillation. It is proved that above-mentioned mechanism canbe used to explain some power oscillations in practical powersystems well, which are triggered off by non-negative dampingmechanism. From the viewpoint of energy, the features andvariation relation between internal and external energy duringthe low frequency oscillation triggered off by resonancemechanism. By use of Matlab software, the simulation andenergy analysis of power oscillation occurred in Anbaotransmission line of southern power network in Hebei powergrid are carried out, the results of simulation and analysis makethe physical process of the oscillation more clear and contributeto understand and recognize power system low frequencyoscillation originated in resonance mechanism.