Distributed Unified Control Method for Medium and Low Voltage DC Power Distribution System

A distributed control, low-voltage DC technology, applied in parallel operation of DC power supply, load balancing in DC network, etc., can solve problems such as not being able to maximize utilization, and achieve the effects of low cost, simple control structure, and optimal operation

Active Publication Date: 2022-05-27
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, distributed power sources all adopt droop control, which cannot maximize the utilization

Method used

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  • Distributed Unified Control Method for Medium and Low Voltage DC Power Distribution System
  • Distributed Unified Control Method for Medium and Low Voltage DC Power Distribution System
  • Distributed Unified Control Method for Medium and Low Voltage DC Power Distribution System

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Embodiment Construction

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The topology of the medium and low voltage DC power distribution system is as follows: figure 1 As shown, the medium and low voltage DC power distribution system includes medium voltage DC bus, low voltage DC bus, DC transformer, photovoltaic power generation unit, energy storage unit, fuel cell unit, grid-connected inverter and various loads. The introduction of the DC transformer makes the voltage control of the system more flexible and complex.

[0039] The distributed unified control method proposed by the present invention includes two parts: one is a distributed control method based on DBS (ie DC bus voltage signal) for photovoltaic, energy storage and fuel cell units; the other is a unified control method for DC transformers . The specific analysis is as follows.

[0040] (1) Distributed control method based on DBS:

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Abstract

The invention discloses a decentralized unified control method for a medium and low voltage direct current power distribution system. The method includes two parts: a decentralized control method based on a DC bus voltage signal and a unified control method for a DC transformer: a decentralized control method based on a DC bus voltage signal The control method is that the photovoltaic, energy storage, and fuel cell units on the DC bus adjust their respective operating modes according to the voltage range of the DC bus voltage to jointly maintain the stability of the DC bus voltage; the unified control method of the DC transformer is in the voltage droop control link On the basis of the above, the displacement control link is added to obtain power control, medium-voltage DC bus voltage regulation function, and low-voltage DC bus voltage regulation function; when the system operation scene changes, the DC transformer does not need to switch the control mode. The invention realizes the integrated control of the medium and low voltage direct current power distribution system, has no communication link, is easy to implement, has high reliability, and realizes the stable operation of the medium and low voltage direct current power distribution system.

Description

Technical field: [0001] The invention relates to a distributed unified control method of a medium and low voltage direct current power distribution system, and belongs to the control field of direct current power distribution technology. Background technique: [0002] With the development of new energy, DC load and power electronic technology, DC power distribution system has been widely used due to its advantages of flexibility and high efficiency. Considering the intermittency of new energy sources, it is crucial to ensure the stable operation of the system. The medium and low voltage DC power distribution system has multiple voltage levels, multiple DC buses, and multiple types of converters, so the operation mode and coordinated control method of the system are more complicated. [0003] At present, most of the main research focuses on the DC microgrid with a single bus structure, and a variety of centralized and decentralized control methods have been proposed. The ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J1/14
CPCH02J1/10H02J1/14
Inventor 陈武潘鹏鹏
Owner SOUTHEAST UNIV
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