Impacts of load model on frequency during the system dynamics

When small sized isolated power systems or micro systems appear fault, impacts of the frequency´s deviation on the power system is not ignored most of the time. Taking the real and separated power grid as the research object, a new method which considers the frequency characteristic of load to identify load´s parameters is proposed. Two curves of frequency dynamic are simulated using the static load model and the measured-based load modeling considering of frequency characteristic in the simulation system, and then two curves compare with measured-base frequency curve respectively. The results of comparing demonstrate it is reasonable that considering of the frequency characteristic of load to identify load´s parameters. On the basis of the load model described above, using of the perturbation theory analyze impacts of the parameters of the measured-based load model on the frequency during the system dynamics. After that, the parameter adjustment is carried out on the above, and the frequency curve of system dynamic is simulated using the parameters after adjustment. The presented method is shown to be effective by the case study on the field measurement data.