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Distributed per-unit power coordinated control method for multi-voltage level DC distribution network

A DC distribution network, multi-voltage level technology, applied in the direction of converting DC power input to DC power output, DC network circuit device, control/regulation system, etc., can solve the problems of complex implementation and poor scalability, and achieve simplified system Analyze and Control Effects

Active Publication Date: 2020-08-25
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the output characteristics of the energy storage system change, or more distribution sub-networks are connected to the existing distribution network through DC transformers, the coordinated control algorithm in the existing distribution network needs to be changed accordingly, so the traditional coordinated control algorithm The implementation is more complex and less scalable

Method used

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  • Distributed per-unit power coordinated control method for multi-voltage level DC distribution network
  • Distributed per-unit power coordinated control method for multi-voltage level DC distribution network
  • Distributed per-unit power coordinated control method for multi-voltage level DC distribution network

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0028] Such as figure 1 In the multi-voltage level DC distribution network shown, the interconnected DC transformer (DCT, DC Transformer) between DC buses (DCB, DC Bus) is used as the core equipment, and a decentralized standard unit power coordination control method is proposed.

[0029] The main body of the multi-voltage level DC distribution network includes: N DC buses (DCB), numbered from #1 to #N; each DCB is connected to a distribution subnetwork (Subnetwork); N-1 DC transformers (DCT), Numbered from #1 to #(N-1), the N-1 DCTs implement tree connection among N DCBs.

[0030] DCT#k (k=1,...,N-1) connects two different DC buses DCB#i and DCB#j (ii，k :n j，k The isolation transformer T k , by the switch tube S 1i，k , S 2i，k， S 3i，k , S 4i，k The H-bridge on one side of DCB#i consists of a switch tube S 1j，k , S 2j，k , S 3j，k , S 4j，k H-bridge on one side ...

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Abstract

The invention relates to the technical field of direct current power supplies, and aims at providing a distributed per-unit power coordinated control method for a multi-voltage-class direct current power distribution network. When the multi-voltage-class direct current power distribution network comprises multiple power distribution sub-networks interconnected via direct current transformers, equipment in the multi-voltage-class direct current power distribution network needs to be configured with corresponding coordinated control algorithms to achieve voltage support and power interaction between the different power distribution sub-networks. Via selecting the proper per-unit value system, the distributed per-unit power coordinated control method can enable the multi-voltage-class directcurrent power distribution network to be equivalent to a direct current power distribution network including one per-unit voltage class, so that the analysis and control of the multi-voltage-class direct current power distribution network are simplified. Based on the selected per-unit system, the provided method implements distributed control on each piece of equipment, and the distributed per-unit coordinated control of the whole multi-voltage-class direct current power distribution network can be achieved. By using the method, the control of each piece of equipment only depends on local information, and the method has the characteristics of being simple and easy to use, and easy to expand.

Description

technical field [0001] The invention relates to a distributed per-unit power coordination control method of a multi-voltage level direct current distribution network, which belongs to the technical field of direct current distribution and utilization. Background technique [0002] Due to its advantages such as high efficiency and no reactive power problem, DC distribution network has received more and more attention. The multi-voltage level DC distribution network can be compatible with different voltage levels of distributed power supply, energy storage and load and other grid equipment, which can further take advantage of the DC distribution network. [0003] The multi-voltage level DC distribution network includes multiple DC buses of different voltage levels, and each bus is connected to the corresponding distributed power supply, energy storage and load to form a distribution subnetwork. Different distribution sub-networks are interconnected through DC transformers to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00H02M3/335
CPCH02J1/00H02M3/3353
Inventor 王晓明李娟彭勇刚韦巍
Owner ZHEJIANG UNIV
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