The reliable action of security and stability control system

which is in accordance with the presinstalled action logic and time after the contingency

is the important barrier for the security and stability operation of power grid under the serious fault. In view of the fact that the whole set of operation time of the current stability control system is hard to reflect the complete period from the occurrence of the fault to the implementation of the control measures. Therefore it is difficult to accurately guide the simulation and analysis of the system. This paper analyzes in detail from fault detection identification to the control action of export process of the stability control system

involved links and its time delay. This provides a reasonable basis for the time performance improvement of the stability control system. A new concept of “the whole control time” is proposed in this paper. Besides

as the stability control system becomes larger and the controlled faults become more complicated

the action time of the entire group of the stability control system is difficult to control in the traditional conservative timing within 300 ms. Therefore

it is suggested to excavate the potential from period of control time

and to improve the time performance of the product from the perspective of the safe operation of power grid.