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Flexible harmonic domain model of a photovoltaic system for steady-state analysis

This paper presents a flexible harmonic domain (FHD) model of a three-phase photovoltaic (PV) system aimed at steady-state analysis. The proposed FHD model involves a PV array Thévenin equivalent, a DC-link capacitor, a boost converter, a three-phase inverter, an LC low-pass filter-bank, a PI-shaped distribution line, and a nonlinear load. The FHD PV model is able to include an arbitrary number of (non-sequentially ordered harmonics) in any state-variable of the system. This permits to use distinct harmonic content for each state-variable based on fundamental information provided beforehand, e.g., switched devices involved, control scheme topologies, nonlinear load characteristic, filter arrangements, and so on. The obtained results by the proposed FHD model are successfully validated with those given by the power system computer-aided design/electromagnetic transients including DC (PSCAD/ EMTDC) simulation tool.