Enhancement in Frequency Response Capability of Grid Connected Photovoltaic System

Due to various serious environmental concerns, it is strongly recommended to produce electricity using large-scale photovoltaic (PV) plants. However, such PV sources must provide frequency support similar to conventional synchronous generators. In this paper, frequency regulation is enabled through deloaded PV. Deloaded PV keeps part of its available power as reserve which can be utilized during frequency disturbances. In order to deal with varying operating conditions such as load/solar insolation change and to utilize PV units with different ratings, a fuzzy-based adaptive deloading control is proposed in this work. It is established that proposed fuzzy-based scheme reduce the oscillations and overshoot in frequency response during the dynamic operating conditions. Moreover, the proposed control enables the PV units to operate as dispatchable sources similar to conventional generators. The extensive simulation results are presented in support of the proposed controller.