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Frequency injection based DC microgrid power sharing control method and system

A DC micro-grid and sub-control technology, which is applied in parallel operation of DC power supplies, DC network circuit devices, electrical components, etc., can solve problems such as converter instability, control effect decline, and huge impact, so as to improve power quality , Improve the ability of stable and reliable operation, and ensure the effect of power sharing

Pending Publication Date: 2018-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the communication network used in this type of control method and the algorithm for parameter transformation in the communication network have added instability to the control of the converter. The fundamental reason is that this type of droop-based control method is based on voltage droop, and the output voltage has a large impact on the overall For the evaluation of power quality, it has a huge impact and is prone to problems
[0004] To sum up, the current control method for DC microgrid power sharing is mainly based on droop control, and there are problems in principle that make the control method mostly a compensatory control, and at the same time, delays such as communication networks are added. The control effect is further reduced

Method used

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  • Frequency injection based DC microgrid power sharing control method and system
  • Frequency injection based DC microgrid power sharing control method and system
  • Frequency injection based DC microgrid power sharing control method and system

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Embodiment Construction

[0045] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0046] Such as figure 1 Shown is the topological structure diagram of the DC microgrid system of the present invention, a DC microgrid power sharing control system based on frequency injection of the present invention, including: a plurality of parallel DC / DC converter units and each Line impedance Z for DC / DC converter unit connection j , load unit, static switch, line impedance Z j The first end is connected to the DC / DC converter unit through a static switch, and the line impedance Z j The second end is connected to the DC bus of the microgrid through the PCC point, the load unit includes a linear impedance and a constant power load, and the load unit is connected to the DC bus of the microgrid through the PCC point; the DC / DC converter unit...

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Abstract

The invention discloses a frequency injection based DC microgrid power sharing control method and system, which are applied to the technical field of microgrid control, and aim to solve the problem that the power cannot be shared due to the line impedance, and droop control cannot achieve power sharing on the premise of the stable output voltage; and the frequency injection based DC microgrid power sharing control method can achieve power sharing of a plurality of convertors in a DC microgrid. The frequency can allow the voltage droop problem existing in the classical droop control to transferto the frequency, so that in the DC microgrid, the stability of the output voltage is ensured, and the power sharing effect is ensured.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to a novel power sharing control technology of a DC micro-grid. Background technique [0002] Using the form of micro-grid to make full use of distributed energy as a local area or even the main grid function is the main way to effectively use distributed energy, which can improve the reliability of power supply in the region and play a supporting role in the main grid. In the past, the demand for DC micro-grids was not very prominent due to the lack of DC power consumption equipment at the power consumption terminal and the easy implementation of the rectification method. However, the proportion of DC equipment in the power consumption terminal has been increasing recently, such as electric locomotives, The power consumption of the Internet and big data is increasing day by day, which makes the importance of DC microgrid increasingly prominent. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
CPCH02J1/102
Inventor 韩杨林成嘉刘宇雄杨平王丛岭熊静琪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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