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Distributed and unified control method of medium and low-voltage direct-current 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 optimal operation, simple control structure, and high reliability. Effect

Active Publication Date: 2019-09-06
SOUTHEAST UNIV
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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 and unified control method of medium and low-voltage direct-current power distribution system
  • Distributed and unified control method of medium and low-voltage direct-current power distribution system
  • Distributed and unified control method of medium and low-voltage direct-current power distribution system

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] The topology of 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 more complex.

[0044] The decentralized unified control method proposed by the present invention includes two parts: one is a decentralized control method based on DBS (that is, 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.

[0045] (1) DBS-based decentralized contro...

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Abstract

The invention discloses a distributed and unified control method of a medium and low-voltage direct-current power distribution system. The method comprises two parts including a distributed control method based on a direct-current bus voltage signal and a unified control method of a direct-current transformer, wherein the distributed control method based on the direct-current bus voltage signal isthat photovoltaic, energy storage and fuel cell units on a direct-current bus adjust respective working modes according to a voltage range of a direct-current bus voltage so as to jointly maintain the direct-current bus voltage to be stable; and the unified control method of the direct-current transformer is that a displacement control link is added on the basis of a voltage droop control link toobtain a power control function, a medium-voltage direct-current bus voltage regulation function and a low-voltage direct-current bus voltage regulation function; and when an operation scene of the system is changed, the direct-current transformer does not need to switch a control mode. According to the method, the integrated control of the medium and low-voltage direct-current power distributionsystem is realized; the communication link is avoided, the realization is easy, and the reliability is high; and stable operation of the medium and low-voltage direct-current power distribution system is realized.

Description

[0001] Technical field: [0002] The invention relates to a decentralized unified control method for a medium and low voltage direct current power distribution system, which belongs to the control field of direct current power distribution technology. [0003] Background technique: [0004] With the development of new energy, DC load and power electronics technology, DC power distribution system has been widely used due to its advantages of flexibility and high efficiency. Considering the intermittent nature of new energy sources, it is very important 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 system's operation mode and coordinated control method are more complicated. [0005] At present, most of the main research focuses on the DC microgrid with a single bus structure, and various centralized and decentralized control methods hav...

Claims

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Application Information

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