【摘要】 目前的快速方向元件普遍采用短数据窗算法,针对其动作范围的整定有一定的保守性与盲目性的缺陷,提出了基于波形系数的自适应方向元件。波形系数可以描述非全波数据窗的波形畸变程度,且波形系数与相位计算误差有明确的关系。故障发生后,实时计算波形系数,并根据波形系数与相位计算误差的关系自适应地调整方向元件的动作范围,使方向元件更好地适应系统的故障状况,提高方向元件的性能。用电力系统动态模拟试验的故障录波数据对该方向元件进行验证,结果证明了该方向元件的优越性。更多还原

【Abstract】 Currently available fast directional elements have some defects such as conservative and blind operation range when short-data-window algorithm is adopted. An adaptive directional element based on waveform factor is proposed in this paper to overcome defects above. The waveform factor can describe the distortion degree of optional data-window that is of certain relationship with phase error. When a fault occurs, the waveform factors of fault voltage and current are calculated in realtime, and then the operational range of directional element is adaptively adjusted according to the relationship between the waveform factors and the phase error. This proposed method can enhance the performance of directional element and work correctly under various conditions. In the paper, data from dynamic simulations are used to test the directional element, and the results show the correctness and advantages of the new directional element proposed.更多还原