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High-precision current equalization control and optimization system and method of direct-current microgrid

A technology of DC microgrid and optimization method, which is applied in the direction of DC network circuit devices, DC power supply parallel operation, electrical components, etc., and can solve problems such as not considering the influence of line impedance parameters on microgrid control and optimization

Inactive Publication Date: 2015-07-29
CHONGQING UNIV
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Problems solved by technology

However, these have not considered the influence of the line impedance parameters on the control and optimization of the microgrid, especially the influence on the accuracy of current sharing. The present invention attempts to find a method. Accurate proportional parameters to reduce the power loss of the microgrid

Method used

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  • High-precision current equalization control and optimization system and method of direct-current microgrid
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Embodiment Construction

[0051] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0052] The basic structure of DC microgrid is as follows: figure 1 As shown, it usually includes micro power supply, inverter device, DC bus, load, energy storage device, etc.

[0053] Such as figure 1 As shown, only DC / DC inverters are needed for DC micro power sources such as solar energy and fuel cells, and only DC / DC inverters are needed for DC loads and energy storage devices. Obviously, DC / DC inverters are more efficient than DC The control of the / AC inverter device should be simple. At the same time, there are no concepts of reactive power and frequency on the DC bus of the DC microgrid, which makes the control of the DC microgrid simpler than that of the AC microgrid.

[0054] The present invention provides a DC micro-grid high-precision current sharing control and optimization system, such as figure 2 As shown, the system inc...

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Abstract

The invention relates to a high-precision current equalization control and optimization system and a high-precision current equalization control and optimization method of a direct-current microgrid, and belongs to the field of the control of microgrids. In the condition that an impedance parameter of a line is taken into consideration, a relation between electric energy loss and a current equalization precision proportional parameter is derived according to an electric energy loss function, so as to further give a proper current equalization precision proportional parameter to realize the minimization of the electric energy loss; according to the derived current equalization precision proportion parameter, by utilizing a low-bandwidth communication technique, a current equalization control algorithm is designed, so as to improve the current equalization precision of the output of a microsource; a low-bandwidth communication layer is only used for transmitting data, and the system can still run stably even though the communication layer does not exist. By using the high-precision current equalization control and optimization system and the high-precision current equalization control and optimization method of the direct-current microgrid, which are provided by the invention, the high-precision current equalization control and optimization can be effectively carried out on the microgrid.

Description

technical field [0001] The invention belongs to the field of microgrid control, and relates to a high-precision current equalization control and optimization system and method for a DC microgrid. Background technique [0002] With the rapid development of modern industry, people's demand for energy is also increasing. Traditional energy is non-renewable and will cause many environmental problems, such as smog, greenhouse effect, etc., prompting people to find new energy to replace some Consumption of traditional energy. [0003] Typical new energy sources include solar energy, wind energy, etc., but these energy sources are limited by natural conditions, and it is difficult to obtain efficient and stable energy sources. For this reason, some scholars have proposed the concept of microgrids in recent years. [0004] Microgrid is a new type of network structure, which is a group of system units composed of micro power supply, load, energy storage system and control device. It...

Claims

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Application Information

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IPC IPC(8): H02J1/12
CPCH02J1/10H02J1/106H02J1/12
Inventor 陈刚郭志军
Owner CHONGQING UNIV
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