Photovoltaic system based transient mitigation and frequency regulation

New grid codes demand contribution by Distributed Generation like photovoltaics, wind power and the like in frequency regulation. In this paper, contribution of a battery connected to standard nine bus system to provide primary control is studied. A photovoltaic system is simulated in which rather than using battery along with PV as is conventionally done, deloaded PVs are used to enhance the frequency regulation capability of the systems. Photovoltaic system is to operate at a point away from Maximum Power Point Tracking (MPPT). The case of frequency response under deloaded operation with frequency regulation is compared with the case when the photovoltaics are working at their MPPT point and thereby not contributing to frequency regulation. A microgrid with a conventional synchronous machine and six photovoltaic generators is considered for the simulation.