Abstract
This paper aims to develop the generalized dynamical model of multiple photovoltaic (PV) units connected to the grid along with the dynamic interaction analysis among different PV units. The dynamical models of multiple PV units are developed by considering three different configurations through which these PV units are connected to the grid. These configurations include: (a) the direct connection of multiple PV units to the grid; (b) the connection of multiple PV units to the grid through a point of common coupling (PCC); and (c) the connection of PV units without a PCC. The proposed modeling framework provides meaningful insights for analyzing dynamic interaction analysis where these interactions from other PV units are expressed in terms of voltages and line impedances rather than the dynamics of currents. The dynamic interactions among different PV units for all these configurations are analyzed using both analytical and simulation studies. Simulations are carried out on an IEEE 15-bus test system and dynamic interactions are analyzed from the total harmonic distortions (THDs) in the current responses of different PV units. Both analytical and simulation studies clearly indicate that the effects of dynamic interactions are prominent with the increase in PV units.
Highlights
Assessments of renewable energy potential are gaining much interest worldwide due to the inceptions of self-reliant energy generation schemes
This paper aims to develop generalized dynamical models for grid-connected systems with multiple PV units with three different configurations
The dynamic interactions among multiple PV units are first theoretically analyzed by representing these in terms of voltage drops and impedances of connecting lines
Summary
Assessments of renewable energy potential are gaining much interest worldwide due to the inceptions of self-reliant energy generation schemes. Such inceptions promote the utilization of renewable energy sources (RESs) in the form of microgrids [1,2] and reduce the pressure on conventional fossil fuels which in turn reduce the greenhouse gas emissions [3,4,5]. The consequences of connecting multiple PV units with the existing power grid are referred as the deterioration of power quality which is usually measured in terms of total harmonic distortions (THDs) and instability due to the poor damping characteristics of the system [9,10,11]. The atmospheric conditions such as the solar irradiation and temperature change
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