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Direct-current micro-grid interconnection converter and power coordination control method thereof

A DC microgrid and converter technology, which is applied in the direction of converting DC power input to DC power output, DC network circuit devices, adjusting electrical variables, etc., can solve the problems of inability to achieve bidirectional energy flow and less degrees of freedom.

Pending Publication Date: 2022-03-18
HARBIN INST OF TECH +1
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  • Claims
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Problems solved by technology

The duty ratio control method is simple, but the two-way flow of energy cannot be realized
Phase shift angle control can realize bidirectional flow of energy, and it is still applicable to the situation where the voltage difference between the primary and secondary sides of the transformer is large, but the degree of freedom of control is less

Method used

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  • Direct-current micro-grid interconnection converter and power coordination control method thereof
  • Direct-current micro-grid interconnection converter and power coordination control method thereof
  • Direct-current micro-grid interconnection converter and power coordination control method thereof

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Embodiment Construction

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] combine Figure 1-9 , the present invention proposes a DC micro-grid interconnection converter, which is formed by cascading a full-bridge three-port converter of an interleaved parallel type and a full-bridge DC-DC converter; the interconnection converter has three ports, three The input of the primary side of the port converter is port 1, the secondary side integrated interleaved parallel Buck-boost is port 3, and the output of the full-br...

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Abstract

The invention provides a direct-current micro-grid interconnection converter and a power coordination control method thereof, the converter is formed by cascading an interleaved three-port converter and a full-bridge DC-DC converter, and low-loss operation and public energy storage access of the direct-current micro-grid interconnection converter can be realized. Furthermore, the invention provides a power coordination control method of the interconnection converter, and the control method allows three ports to operate independently so as to realize power flow control between the two direct-current micro-grids and the public energy storage. According to the interconnection converter and the power coordination control method thereof, the system power fluctuation can be stabilized, the system reliability is improved, and the operation cost is reduced. The parallel competition control strategy of the public energy storage port enables transition of control variables to be smoother, violent transient change or oscillation of the converter is avoided, and the stability of the control system is improved.

Description

technical field [0001] The invention belongs to the technical field of DC micro-grids, and in particular relates to a DC micro-grid interconnection converter and a power coordination control method thereof. Background technique [0002] Microgrids that integrate distributed renewable energy, energy storage systems, and various loads are of great significance for achieving carbon peaking, carbon neutrality, and solving environmental and energy issues. Compared with AC microgrid, DC microgrid has the advantages of simple control, low loss and high power quality. A single DC microgrid mainly obtains energy from photovoltaic and wind power, but the power of photovoltaic and wind power generation systems will be affected by weather conditions, which is intermittent and fluctuating. By interconnecting DC microgrids, excess power in one microgrid can be transferred to another microgrid and vice versa. By sharing the load with the adjacent DC microgrid, the influence of the power ...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02M3/158H02M3/335
CPCH02J1/00H02M3/33584H02M3/1582H02M3/1584
Inventor 王盼宝李珅光任鹏周洋王卫徐殿国
Owner HARBIN INST OF TECH
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