Grid-connected non-networking micro-grid system and control protection method thereof
A micro-grid and central controller technology, which is applied to the grid-connected and non-grid-connected micro-grid system and its control and protection fields, can solve the impact of the safe and stable operation of the power grid, the power quality of the distribution network, the reliability of power supply, and the influence and distribution of relay protection. The grid-connected power generation does not have the characteristics of being grid-friendly, and achieves the effect of reducing electricity demand, good project demonstration benefits, good power supply reliability and power quality.
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[0031] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0032] The structure of a grid-connected and off-grid micro-grid system of the present invention is as follows: figure 1 As shown, including distributed power generation systems (wind power generation systems, photovoltaic power generation systems), distributed energy storage systems (battery energy storage systems) and user loads (local loads, conventional loads); among them, distributed power generation systems and distributed The energy storage system is connected to the 380V low-voltage AC busbar through its own energy conversion equipment, and the low-voltage AC busbar is then connected to the 10kV high-voltage AC busbar through a step-up transformer to realize ...
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