Control strategy of voltage and frequency for islanded microgrid

Abstract

The voltage and frequency (V/F) of microgrid loss support when the operation of microgrid switches from grid-connected mode to islanded mode, therefore controlling of voltage and frequency is needed. A control strategy of voltage and frequency based on battery is proposed in this paper which purposed on regulating an islanded microgrid containing kinds of distributed generators (DG). According to the problem of traditional droop control of V/F that does not take into account of load structural changes, the control of battery introduces the voltage and current feedforward based on traditional V/F control strategy. Considering the variation of structure and parameter of the load is more suitable for practical power system. At the same time, aiming at the irreasonability caused by the equivalent source of photovoltaic (PV) system, this paper constructs the detailed system of PV. The validity of proposed control strategy is demonstrated through simulating the various states of searched microgrid.