DC microgrid group system and novel layered control method thereof

A DC micro-grid and micro-grid technology, which is applied in the direction of AC network circuits, single-network parallel feeding arrangements, electrical components, etc., can solve problems such as the decrease of shunt accuracy and the complex control of DC micro-grid groups

Active Publication Date: 2019-04-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

When the line resistances are not equal, the sum of the virtual resistance of each converter and the line resistance is also not equal, resulting in a decrease in shunt acc

Method used

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  • DC microgrid group system and novel layered control method thereof
  • DC microgrid group system and novel layered control method thereof
  • DC microgrid group system and novel layered control method thereof

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Embodiment Construction

[0076] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0077] like figure 1 As shown, the DC microgrid system includes 3 DC sub-microgrids, which are respectively named as the first sub-microgrid, the second sub-microgrid, and the third sub-microgrid. Each DC sub-microgrid contains 3 BUCK converters. The three converters in the first sub-microgrid are respectively numbered #1, #2 and #3, the three converters in the second sub-microgrid are respectively numbered #4, #5 and #6, and the third sub-microgrid The three converters in the network are respectively numbered #7, #8 and #9. All BUCK converters are connected to the DC bus through connecting wires, but the resistances of the connecting wires in the same sub-microgrid are not equal to each other. The first controller controls the three DC converters of the first sub-microgrid, the second controller controls the three DC converters of the secon...

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Abstract

The invention discloses a DC microgrid group system and a novel layered control method thereof. The DC microgrid group system includes three DC sub-microgrids, each of the DC sub-microgrids includes three BUCK converters, each BUCK converter is connected to a DC bus through a connection line, and the resistance of a connection line of each BUCK converter in the sub-microgrid is not equal to each other. The invention provides the novel layered control method which can be divided into three layers of control in total. The top layer is DC microgrid group coordinated control, and the main goal ofthe layer is to coordinate the sub-microgrids to achieve the current distribution of any ratio between the sub-microgrids. The second layer is voltage compensation control and droop coefficient correction control, and the main goal of the layer is to improve the control accuracy of the DC bus voltage and improve the current distribution accuracy between DC converters in the sub-microgrids. The bottom layer is droop control and voltage single-closed-loop control, and the main goal of the layer is to perform quick and reliable tracking control on a control result obtained by an upper layer. According to a layered control algorithm proposed by the invention, the arbitrary ratio distribution of the current between the sub-microgrids is realized, the current distribution precision of the converters in the sub-microgrids is improved, and the control error of the DC bus voltage is reduced.

Description

technical field [0001] The invention belongs to the field of direct current micro-grid control of electric power system, relates to a novel layered control method, in particular to a control method based on output voltage compensation control, variable droop coefficient control, and sub-micro-grid power coordination control and the control method using the method A DC microgrid system. Background technique [0002] With the access of a large number of renewable new energy sources, the concept of micro grid has been proposed. Microgrids can be divided into AC microgrids and DC microgrids. Compared with the AC micro-grid, the DC micro-grid can improve the utilization rate of the converter and reduce the loss, which is conducive to the complementary advantages and coordinated control of the various micro-sources, and the DC system does not have phase synchronization, harmonics, and reactive power losses. Therefore, DC microgrid has become a new research direction of microgrid...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/381H02J3/46H02J2203/20Y02E60/60
Inventor 韩杨李路桥宁星王丛岭杨平熊静琪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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