Abstract:
Since photovoltaic power generation depends on power electronics, it lacks damping and inertia properties from the environment. This paper establishes the static synchronous generator (SSG) model of a grid-connected photovoltaic power generation system based on DC voltage droop control.
The goal is to make the capacitance of the medium time scale participate in the grid frequency response without requiring the addition of additional equipment. The primary parameters influencing the system’s inertia, damping, and synchronization properties as well as their effect laws are analyzed using the model.
The study’s findings demonstrate that the capacitor’s medium-time scale energy storage impact can also cause the system to display specific inertia traits. From the perspective of control parameters, the system’s inertia characteristic gets greater as the droop coefficient D p drops. The damping effect of the system is bigger the larger the DC voltage outer loop proportional coefficient K p is.
The stronger the system’s ability to synchronize, the greater the DC voltage outer loop integral coefficient K i. Furthermore, the results of the theoretical study are confirmed to be accurate using the MATLAB/Simulink simulation platform.
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