Load Modeling During Asymmetric Disturbance in a Metropolitan Power Grid

Nowadays, the measurement-based approach is one of the main methods in load modeling but it has some defects in practice, mainly, it only utilizes the data recorded during three-phase symmetric disturbances which rarely happen in power systems. In this paper load modeling during asymmetric disturbances (LMAD) is proposed. LMAD may collect data during asymmetric disturbances which occur more often in power systems. Some measured data are chosen to testify LMAD with satisfying results which not only validate the method but also are applied in power system simulation now. LMAD is promising in load modeling since it does not need extra field tests and special data acquisition instruments, both of which hardly get approval of utilities. Furthermore, the conditions on the uniqueness of identified load model parameters are discussed. Some characteristics like electromagnetic torque of the load model are studied as well.