减载控制灵敏度及其在广域低频保护中的应用

Load shedding control sensitivity and its applications in wide-area low-frequency protection

针对现有低频减载控制过程中无法明确减载地点及对应减载量的问题,以多机电力系统有功扰动分配模型为基础,提出了负荷节点减载控制灵敏度的概念,从而提出了基于负荷减载控制灵敏度的减载地点选取方法及减载量分配模型,并将其应用在极端扰动方式下电力系统广域低频保护中。仿真结果表明,在减载量相同的前提下,所提方案比平均分配减载量的方案有着更加优良的性能。

The existing procedures of under-frequency load shedding control cannot confirm the location and capacity of shed loads. The load shedding control sensitivity of load node is proposed based on the active-power interference distribution model of multi-generator system,according to which,a method of load shedding location selection and a load shedding capacity distribution model are proposed. It is applied to the wide-area lowfrequency protection of power system under the extreme disturbance mode. The simulative results show that,for the same load shedding capacity,the proposed scheme has better control performance than the uniform load shedding scheme.