A layered structure of a bipolar DC system adopting a plurality of voltage equalizers connected in parallel and a control method

A voltage equalization and DC system technology, applied in parallel operation of DC power supplies, DC network circuit devices, electrical components, etc., can solve problems such as low operating efficiency, low system reliability, loss, etc., to improve operating efficiency and improve system operation Reliability and the effect of reducing system cost

Inactive Publication Date: 2019-01-04
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

When the voltage equalizer is out of operation, the system will still face the problem of voltage imbalance, resulting in lower system reliability
In addition, the existing technology relies on a centralized voltage equalizer, and the unbalanced power between the positive and negative poles of the system is transformed by this single converter
Causes additional line loss, resulting in less efficient system operation

Method used

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  • A layered structure of a bipolar DC system adopting a plurality of voltage equalizers connected in parallel and a control method
  • A layered structure of a bipolar DC system adopting a plurality of voltage equalizers connected in parallel and a control method
  • A layered structure of a bipolar DC system adopting a plurality of voltage equalizers connected in parallel and a control method

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Embodiment Construction

[0060] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0061] In order to improve the reliability and operating efficiency of the bipolar system, the present invention proposes a hierarchical control structure and method for the bipolar DC system using multiple voltage equalizers connected in parallel. Based on the analysis of the basic access modes in the bipolar system, three basic forms of voltage imbalance in the bipolar system are concluded. On this basis, the function of the voltage equalizer is analyzed, and an "unbalanced voltage-power" droop contro...

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Abstract

The invention provides a layered structure of a bipolar DC system adopting a plurlaity of voltage equalizers connected in parallel and a control method. The structure comprises a coordinated control structure between independent voltage sources IVS and a coordinated control structure between voltage equalizers VB. The coordinated control between the independent voltage sources IVS includes two layers, and the coordinated control between the voltage equalizers VB includes three layers. Based on the analysis of the basic access mode in the bipolar system, the invention obtains three basic voltage unbalance forms in the bipolar system, and puts forward a multi-voltage equalizer parallel ''unbalanced voltage-power'' sag control strategy suitable for three voltage uneven working conditions, thereby realizing the redundant configuration of the multi-voltage equalizer in the bipolar system and improving the system reliability. At that same time, the total power loss of the system is reduce bythe coordinated operation of the voltage equalizers.

Description

technical field [0001] The invention relates to the fields of new energy power generation and DC distribution network, in particular to a bipolar DC system layered structure and control method using multi-voltage equalizers connected in parallel. Background technique [0002] The DC microgrid provides a high-efficiency access method for renewable energy sources (RES) and energy storage systems (ESS) output in the form of DC. Since there is no frequency control problem in the DC system, the control of the DC microgrid is simpler than that of the AC microgrid. Due to the above advantages, the DC microgrid is considered to be a key technology for the future smart grid. Among various DC microgrid topologies, bipolar DC systems have received special attention. The system can provide three flexible connection modes of "positive pole-ground", "ground-negative pole" and "positive pole-negative pole". At the same time, the line-to-ground voltage and insulation design requirements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/102H02J1/106
Inventor 朱淼徐莉婷马建军蔡旭
Owner SHANGHAI JIAO TONG UNIV
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