Alternating current and direct current hybrid micro-grid system
An AC-DC hybrid, micro-grid technology, applied in the integration of renewable energy, single-grid parallel feeding arrangement, photovoltaic power generation, etc., can solve the loss of power for important loads, the inability to achieve load-level power supply, and the inability to guarantee the supply of internal loads in the system, etc. problems, to achieve the effect of improving power supply reliability, uninterrupted high-reliability power supply, and structural strengthening
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Embodiment 1
[0021] figure 1 It is a structural block diagram of an embodiment of an AC / DC hybrid microgrid system provided by the present invention. like figure 1 As shown, this embodiment constructs an AC-DC hybrid microgrid system, including the following structure:
[0022] D101, optical storage integrated power supply unit. The optical-storage integrated power supply unit includes a DC power supply system, an AC / DC conversion device, a first AC load and an AC micro-grid bus. The DC power supply system is connected to the AC microgrid busbar through the AC / DC conversion device, and the first AC load is connected to the AC microgrid busbar, and is powered by the DC power supply system. The DC power supply system includes a photovoltaic device, an energy storage device, a DC load and a DC bus. The photovoltaic device and the energy storage device are connected to the DC bus through a DC / DC conversion device. The DC load is connected to the DC bus and powered by the photovoltaic device...
Embodiment 2
[0027] figure 2 It is a structural diagram of an embodiment of an AC / DC hybrid microgrid system provided by the present invention. In this embodiment, the AC / DC hybrid microgrid system provided by the present invention is constructed in detail.
[0028] Based on the 400V bus bar, each power generation unit and power consumption unit are formed through a certain combination method such as figure 2 The AC-DC hybrid microgrid system shown. Among them, area C is the structure of the entire microgrid system, including the triple power supply unit in area A and the integrated optical storage power supply unit in area B. Load 5 is a tertiary load powered by bus 4; load 1 and load 2 are secondary loads powered by bus 6 and bus 7 supply power; load 3 and load 4 are primary loads, load 3 is a DC load powered by the DC bus, and load 4 is powered by bus 8; ice storage air conditioners are other loads outside the microgrid. Microgrid areas A, B, C, and D can all work independently.
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Embodiment 3
[0044] image 3 It is an important load power supply design structure diagram of an embodiment of an AC / DC hybrid microgrid system provided by the present invention. like image 3 As shown, this embodiment realizes the power supply of important loads in the microgrid.
[0045] In order to improve the power supply reliability of the system, some loads can be treated as important loads, and a dual power supply automatic switching power supply design is adopted for them. In this embodiment, load 4 is an important load. like image 3 As shown, the switch 9 and the switch 10 are the incoming line switches of the load 4, and the two switches adopt a mechanical interlocking design, and its action logic is as follows: Assuming normal operation, set the busbar 5 as the main power supply source, switch 9 is opened, and switch 10 is closed; When the power supply of the bus 5 fails, the bus voltage loss is detected, the switch 9 is closed, and the switch 10 is opened at the same time, ...
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