A Distributed Elastic Voltage Restoration and Current Distribution Method for DC Microgrid

A technology of DC micro-grid and voltage recovery, applied in the direction of AC network voltage adjustment, AC network circuits, electrical components, etc., to achieve the effects of ensuring safe operation, reducing communication costs, and reducing observations

Active Publication Date: 2022-05-03
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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  • A Distributed Elastic Voltage Restoration and Current Distribution Method for DC Microgrid
  • A Distributed Elastic Voltage Restoration and Current Distribution Method for DC Microgrid
  • A Distributed Elastic Voltage Restoration and Current Distribution Method for DC Microgrid

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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 recovery 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 in ...

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Abstract

A distributed elastic voltage recovery and current distribution method for DC microgrid. Firstly, modeling and analysis of DC microgrid, considering the bus voltage error caused by the attack; constructing an intermediate observer; and estimating the attack signal in real time; finally designing The corresponding elastic controller compensates the system; realizes the control objectives of secondary recovery of DC bus voltage and proportional distribution of current. The method of the invention takes into account the phenomenon of network attacks in the DC micro-grid system, and can observe the attacks on the system in real time, thereby improving the overall reliability of the DC micro-grid system.

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...

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Application Information

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Patent Type & Authority Patents(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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