What is a three-phase grid-tied PV generator?
Three-phase PV generators, such as the utility-scale solar power plants, are often connected to the high voltage sub-transmission or transmission networks. This paper focuses on the dynamic models of the PV generator for power system dynamic studies, thus will concentrate on the three-phase grid-tied PV generator.
What are the different types of PV generators?
Based on where the generated electric energy is used, a PV generator also can be categorized into a stand-alone PV system or a grid-tied PV generator. A PV generator can also be classified into a single-phase system or a three-phase system.
Why should PV generators be integrated into the grid?
With the increased integration of PV generators into the grid, the system operators start to require PV generators have capabilities to stay online during the fault, and provide the active power and the reactive power supports when being required to do so.
How is a PV generator modeled in a power system steady state study?
A PV generator is modeled as a constant active power and reactive power source in power system steady state studies. When PV generation changes due to the ambient environment, the power system steady state studies do not investigate the transients of the power system caused by the change in PV generation.
How does a single-stage PV generator work?
A single-stage PV generator uses only one converter to complete both the maximum power point tracking (MPPT) and the power grid connection. The DC link capacitor decouples the AC energy and the DC energy, and is constantly charged or discharged due to the imbalance between these two forms of energies.
How does a PV generator work?
By controlling the instantaneous three-phase inverter output voltages v a, v b and v c, the PV generator controls the active power output and the reactive power interchanges with the external grid.
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