Power Quality Pre-evaluation Method of PV Power Station Considering Its Output Elements

At present, the studies of power quality pre-evaluation of PV power station mainly focus on the internal mechanism modeling of PV power generation units, which makes the modeling and calculation process complex. Aiming at the situation mentioned above, this paper presents a power quality pre-evaluation method of PV power station considering its output elements. First of all, the paper establishes an equivalent model of PV power generation unit by taking the light intensity and temperature as the input, and the steady output current and voltage as output. Secondly, a power source model and a harmonic source model are paralleled to establish an equivalent model of single PV power generation unit in the working conditions. Then, the equivalent model of a grid-connected PV power station in Guangdong Province is built on the PSCAD/EMTDC. Finally the paper makes a detailed power quality pre-evaluation of the PV power station and verifies the practicality of this method. (paper)