Coordinated control method of AC and DC microgrid based on power electronic transformer

A technology for power electronics and transformers, applied in the field of transformers, can solve the problems of large influence of microgrid state distributed energy output and load fluctuations, power cannot be transmitted to each other, frequent operating state changes, etc., so as to reduce the number of power feedback and relieve communication pressure. , the effect of improving the service life

Active Publication Date: 2021-05-18
NANJING INST OF TECH
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Problems solved by technology

[0005] The existing definition of the operating state of the microgrid only starts from the perspective of distributed energy output and load, and fails to consider the impact of energy storage on the state of the microgrid. Therefore, the state of the microgrid is greatly affected by the output of distributed energy and load fluctuations. frequent changes
In the power control of the existing power electronic transformer to the AC and DC microgrid, the power between the AC microgrid and the DC microgrid cannot be transmitted to each other, and the control amount is complex and the target is not clear

Method used

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  • Coordinated control method of AC and DC microgrid based on power electronic transformer
  • Coordinated control method of AC and DC microgrid based on power electronic transformer
  • Coordinated control method of AC and DC microgrid based on power electronic transformer

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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] Unless the context clearly states otherwise, the number of elements and components in the present invention can exist in a single form or in multiple forms, and the present invention is not limited thereto. Although the steps in the present invention are arranged with labels, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted. It can be understood that the term "and / or" used herein refers to and covers any and all possible combina...

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Abstract

The present invention provides an AC / DC micro-grid coordinated control method based on a power electronic transformer. The AC-DC micro-grid coordinated control method based on a power electronic transformer includes the following steps: 1. Collect real-time operation data of the micro-grid and establish a micro-grid distribution 2. Calculate the average value of the distributed energy output power and the average value of the load demand power in the current dispatching cycle to obtain the expected value of the state of charge of the microgrid energy storage; 3. Divide the type of microgrid operating status, , According to the type of micro-grid operating status, the power electronic transformer controls the power flow and size of the AC-DC micro-grid. The beneficial effects of the present invention are: the AC-DC micro-grid coordinated control method based on the power electronic transformer can realize the maximum consumption of distributed energy, improve the service life of the energy storage battery, and reduce the number of power feedbacks from the micro-grid to the distribution network and power loss during feedback.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to an AC / DC microgrid coordination control method based on power electronic transformers. Background technique [0002] The utilization of large-scale distributed energy resources (Distributed Energy Resources, DER) is of great significance to the protection of the environment, adjustment of energy structure and power consumption in remote areas. DER is affected by time and space factors and the power fluctuates greatly. Energy storage technology is an effective smoothing measure for this intermittent fluctuation. The microgrid composed of sources, loads, and storages is a strong support for the stable operation of the power grid. [0003] The existing micro-grid is mainly based on AC. With the rapid development and wide application of DC power sources and loads such as photovoltaics, energy storage, and electric vehicles, the DC power distribution form used in data center pow...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/02H02J3/32
CPCH02J3/02H02J3/32
Inventor 郝思鹏周宇黄琳黄堃刘思亦杨李星
Owner NANJING INST OF TECH
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