Investigation on the Impact of Solar Photovoltaic Sources on Interconnected Power System

Abstract

newline Considering the technical challenges present in the power systems, there is an increasing need for PV to participate in frequency regulation like other conventional generators. The work presented in this thesis focus on power control strategy provided by large scale PV system without any energy storage support. The proposed controller derives droop and inertial response from the PV sources by operating it at a reduced level of power reserve without forfeiting system stability and economic benefits. To assess the effectiveness of the proposed controller, an IEEE 14-bus test system is considered and load disturbances were investigated through simulation studies. The bus system is extended to a more realistic network by incorporating different generating units and has also considered various nonlinearities such as generation rate constraint, governor dead band, and delay in area control error signal. The results show that the combined control of droop and inertial response from PV system contributes in a better way for frequency control. The superiority of the proposed controller has been demonstrated by comparing the results with the recently published frequency control regulation with PV. It is observed from the simulation results that the proposed control provides a better response. Furthermore, sensitivity analysis is performed to investigate the robustness of the controller to variations in system parameters from nominal values. Finally, an economic analysis carried out to study the prospect of PV participating in ancillary services.