Power Control Strategy for Solar Photovoltaic Systems for Fast Frequency Response Ancillary Service

This work presents the development of a novel power control approach for solar photovoltaic (PV) systems in order to provide power reserve control (PRC) and thereby offer fast frequency response ancillary service in an interconnected multi-area power system framework. The proposed PRC eliminates the need for an irradiance sensor and excludes the requirement for time-consuming curve fitting operations to determine maximum power point (MPP) quantities. A self-adaptive voltage tracking method (inner control) is introduced, for rapid conversion of an active power command into an equivalent voltage command for the interconnecting converter, ensuring the desired power exchange between the PV plant and the power system. Additionally, a frequency regulation scheme for an interconnected power system is built to generate an acceptable power reference for the inner controller, and it is incorporated with the proposed PV control algorithm with limits placed on the power command. The results show that the proposed control approach is effective in significantly reducing frequency and tie-power deviations. Copyright (c) 2022 The Authors. This is an open access article under the CC-BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/)