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In this paper, a method to calculate online units' minimum capacity correspond to a certain capacity of wind power is proposed firstly. Then as a comparison, PSPS is added into the model and corresponding results can be achieved. By comparing the results, effects of PSPS on wind power integration into grid can be obtained. In this paper, we take Shandong power grid as example and analyze its situations. It should be noticed that when capacity of wind power is very low, utilization rate of wind power is 100% without PSPS, which means because of existence of peak load regulation ability of traditional units, grid can accommodate a certain capacity of wind power without PSPS. It indicates that PSPS is not necessary for power grid to accommodating wind power at low level of wind power.