A Novel DC Microgrid Cluster Topology and Its Distributed Power Cooperative Control Method

A DC micro-grid and decentralized technology, which is applied in the direction of load balancing in the DC network, power transmission AC network, and parallel operation of DC power supplies. It can solve the limited application scenarios of the DC micro-grid group topology and insufficient power interaction between subnets, etc. problem, achieve the effect of reducing construction cost, simple implementation method and reducing fluctuation

Active Publication Date: 2022-02-11
ZHEJIANG UNIV +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a novel DC micro-grid topology and a corresponding distributed power collaborative control method for the problems of limited applicable scenarios of the existing DC micro-grid group topology and insufficient power interaction between subnets, so as to realize the DC micro-grid group Multi-voltage levels, coordinated and mutual operation between subnets

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  • A Novel DC Microgrid Cluster Topology and Its Distributed Power Cooperative Control Method
  • A Novel DC Microgrid Cluster Topology and Its Distributed Power Cooperative Control Method
  • A Novel DC Microgrid Cluster Topology and Its Distributed Power Cooperative Control Method

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[0036] The technical solutions of the present invention will be further described in detail below according to the drawings and preferred embodiments.

[0037] figure 1 It is the DC microgrid group structure described in the embodiment of the present invention, including an energy storage subnet composed of two energy storage units, two energy storage bidirectional DC / DC converters, three DC subnetworks with different voltage levels, two Two-way interconnection of DC / DC converters in sub-networks, several photovoltaic power generation units and DC loads.

[0038] Figure 2 to Figure 5A schematic diagram of a DC microgrid group power cooperative control method and related underlying control provided by an embodiment of the present invention, including the following steps:

[0039] (1) Energy storage bidirectional DC / DC converter droop control as figure 2 , 3 as shown, The droop control module collects the voltage v across the capacitor on the output side of the jth ene...

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Abstract

The invention discloses a novel DC micro-network group topology structure containing energy storage subnets and a corresponding distributed power collaborative control method, and relates to the field of DC power transmission and distribution. The method adds separate energy storage to the traditional DC micro-network group architecture Subnets, set up DC subnets with different bus voltage levels to adapt to the access of DC loads with different power requirements, and design corresponding distributed power collaborative control strategies to realize power coordination and mutual aid among DC subnets and improve microgrid groups System operation stability. The control method of the present invention does not require additional communication equipment, realizes flexible, fair and controllable distribution of power between subnets, and reduces the cost of realizing power coordinated control. Its implementation method is simple and flexible, and the power quality can be significantly guaranteed .

Description

technical field [0001] The invention relates to the field of direct current power transmission and distribution, in particular to a novel direct current micro-network group topology and a distributed power cooperative control method thereof. Background technique [0002] Microgrids flexibly integrate new energy power generation units and loads in the area, which can effectively improve the utilization rate of renewable energy and system operation reliability. At present, microgrids are mainly divided into AC microgrids, AC-DC hybrid microgrids and DC microgrids. The main form, with the rapid development of new DC loads such as data centers and DC household appliances, the traditional AC microgrid is limited by the AC-DC conversion link, and the overall operating efficiency is low. Compared with it, the control strategy of the DC microgrid is simpler. The operation is more flexible and efficient, and it has gradually replaced the AC microgrid in the construction of smart citi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J1/14H02J3/36
CPCH02J1/10H02J1/14H02J3/36Y02E60/60
Inventor 于淼赵竞涵陆玲霞齐冬莲李维军潘宏伟
Owner ZHEJIANG UNIV
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