The study of the strategy of low frequency load shedding of grid frequency

The paper analyzed the research status of the low frequency load shedding, pointed out the crucial issues. UFLS plan now is often through the simulation technology to be set up. In this paper, an evaluation method based on the degree of closeness between the frequency simulation trajectory and the measured trajectory, which was the mathematical model of the error evaluation between the frequency simulation trajectory and the measured trajectory, was proposed to evaluate the simulation accuracy of the system frequency synthetically. The effectiveness of the error model and evaluation method proposed was verified according to the calculation analysis of the frequency measured trajectory and the simulation trajectory in the several frequency decreasing events of Northeast China power grid.