For the distributed time delays in wide-area power system stabilizer (WPSS) system

a compensation algorithm based on grey prediction is proposed. It uses some measured data of inter-area relative angular velocity to predict a set of future data by grey prediction

and chooses appropriate data from the predicted data set as the data corresponding to the current system time by comparing the time tag of these predicted data and current system time of WPSS. Then

the selected data is sent as input of WPSS. In this way

the distributed time delays in WPSS can be compensated for adaptively. Under three conditions of different delays

the suggested algorithm is illustrated respectively on a four-machine two-area simulation platform in the case of large disturbances and small perturbations. Simulation results show that this proposed time compensating algorithm is able to work effectively in WPSS under different conditions. This work is supported by National High Technology Research and Development Program of China (863 Program) (No. 2012AA050218) and National Key Technologies R&D Program (No. 2015BAA01B04).