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Self-adaptive robust power coordinated distribution method for multi-source direct-current microgrid

A technology for coordinated power distribution and DC microgrid, which is applied in parallel operation of DC power supplies, DC network circuit devices, load balancing in DC networks, etc. Achieve the effect of clear functional structure, weak influence, strong self-adaptation and robustness

Active Publication Date: 2020-01-07
NANTONG UNIVERSITY
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Problems solved by technology

[0005] This invention is aimed at the actual situation that there is distributed line impedance in DC microgrid, and its resistance value is unmeasurable, inaccurate and variable, which will easily lead to multiple distributed power sources. In order to improve the power supply stability of the DC microgrid, a new method was invented to alleviate the problems of disordered power distribution between the grids, uneven current flow of the lines, and bus voltage instability. reliability

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  • Self-adaptive robust power coordinated distribution method for multi-source direct-current microgrid
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  • Self-adaptive robust power coordinated distribution method for multi-source direct-current microgrid

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Embodiment Construction

[0064] See attached figure 1 , the present invention takes a DC microgrid containing 2 distributed power sources (i.e. i=2) as an example for implementation description. Each distributed power source is connected to the DC microgrid via an access converter as a power conversion unit. Each access converter is controlled and operated by a power coordination distributor, and the multi-source DC microgrid self-adaptive robust power coordination distribution method of the present invention runs in the power coordination distributor; the power coordination distributor is in operation The required real-time voltage, current and other physical quantities are obtained by sensor detection.

[0065] Select an access converter whose parameters are: rated voltage U oi N =48V, the maximum voltage deviation ΔU oi,max =2.4V, the maximum output current I oi,max = 10A. With the output current i of the access converter oi As an independent variable, the alternative equivalent resistance R...

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Abstract

The invention discloses a self-adaptive robust power coordination distribution method for a multi-source direct-current microgrid and belongs to the field of direct-current microgrid power control. According to the method, a continuous smooth nonlinear equivalent resistance adjustment law is firstly established; the stable adjustment control quantity of a bus-bar voltage is calculated; the power coordination control quantities of access converters are calculated; the control quantities are integrated, so that effective control on the access converters can be realized. According to the prior art, distributed line impedance exists in a direct-current microgrid, the impedance value of the distributed line impedance is unpredictable, inaccurate and tends to change, and as a result, problems such as disordered power distribution, non-uniform line current, unstable bus-bar voltage among a plurality of distributed power supplies are easily brought about. Thus, the invention provides a new method to alleviate defects such as the overlarge voltage drop of the bus-bar voltage and uncoordinated load power distribution and improve the power supply stability and reliability of the direct-current microgrid.

Description

technical field [0001] The invention belongs to the technical field of multi-source DC micro-grid power distribution, and in particular relates to a multi-source DC micro-grid adaptive robust power coordination distribution method. Background technique [0002] With the gradual depletion of fossil fuels and the increasingly serious environmental problems, distributed power generation technology based on clean energy has been widely used. The microgrid organizes the distributed power generation system and load together into a microgrid, which can effectively improve the utilization efficiency of distributed power and reduce the impact of distributed power and load changes on the power grid. Compared with the AC microgrid, the DC microgrid has the following advantages: 1) Reduce energy conversion devices, improve system efficiency and reliability; 2) Easy to control, only need to control the stability of the DC bus voltage to realize micro power and load Power balance; 3) The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/14H02J1/10
CPCH02J1/14H02J1/102
Inventor 茅靖峰张珍梦吴爱华张旭东武剑郭依帆易龙芳邱爱兵
Owner NANTONG UNIVERSITY
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