Distributed elastic voltage recovery and current distribution method for direct-current micro-grid

A DC microgrid and current distribution technology, applied in the direction of AC network voltage adjustment, AC network circuits, electrical components, etc., to ensure safe operation, reduce communication costs, and reduce the effect of observation.

Active Publication Date: 2021-06-18
ZHEJIANG UNIV OF TECH
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Problems solved by technology

Many existing detection measures are based on observer matching conditions, which cannot be satisfied for many practical systems; some methods without observer matching conditions are proposed based on performance optimization, and the error range cannot be clearly obtained through theoretical analysis

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  • Distributed elastic voltage recovery and current distribution method for direct-current micro-grid
  • Distributed elastic voltage recovery and current distribution method for direct-current micro-grid
  • Distributed elastic voltage recovery and current distribution method for direct-current micro-grid

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Embodiment Construction

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and actual experiments.

[0050] refer to Figure 1 to Figure 7, a DC microgrid distributed elastic voltage restoration and current distribution method, comprising the following steps:

[0051] 1) Establish a DC microgrid model under attack, the process is as follows:

[0052] 1.1) Based on the droop control equation, the DC bus voltage equation can be obtained as shown in formula (1):

[0053] V b =V * -(R i +d i ) I i (1)

[0054] where V b is the bus voltage value, V * is the voltage reference value, R i is the line impedance, d i is the droop coefficient, I i is the output current;

[0055] 1.2) In order to solve the bus voltage deviation problem caused by the droop function, a distributed two-layer control input is added, as shown ...

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Abstract

A distributed elastic voltage recovery and current distribution method for a direct-current micro-grid comprises the following steps: firstly, carrying out modeling analysis on the direct-current micro-grid, and considering a bus voltage error problem caused by attack; constructing an intermediate observer; estimating the attack signal in real time; and finally, designing a corresponding elastic controller to compensate the system. And the control targets of secondary recovery of the direct-current bus voltage and proportional distribution of the current are achieved. According to the method, the phenomenon of network attack in the direct current micro-grid system is considered, and the attack of the system can be observed in real time, so that the overall reliability of the direct current micro-grid system is improved.

Description

technical field [0001] The invention belongs to the field of micro-grid security, and in particular relates to a DC micro-grid distributed elastic voltage recovery and current distribution method. Background technique [0002] With the shortage of traditional energy supply and the improvement of electricity reliability, the microgrid based on efficient and clean distributed generation (DG) combined with energy storage units, loads and related control devices has become a flexible, The advanced new power supply mode is a hot research topic at home and abroad in recent years. The microgrid can be operated in parallel with the large power grid, or it can be operated in an island under grid failure, independently supplying power to local loads, with high power supply security and reliability. [0003] With the shortage of traditional energy supply and the improvement of electricity reliability, the microgrid is a new type of energy storage unit, load and related control devices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/12
CPCH02J3/388H02J3/46H02J3/12
Inventor 郭方洪李赫郑祥康董辉张文安朱俊威
Owner ZHEJIANG UNIV OF TECH
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