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Improved optimal control method for distributed hybrid microgrid

An optimized control and distributed technology, applied in electrical components, circuit devices, circuit layout of AC and DC networks, etc., can solve problems affecting the coordination consistency and stability of hybrid microgrids, and improve coordination consistency and energy balance and stability. The effect of reducing the complexity of control and reducing the amount of communication

Active Publication Date: 2019-11-01
CENT SOUTH UNIV
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Problems solved by technology

However, since there are often more energy storage units with batteries in hybrid microgrids, the energy storage units are usually treated as ordinary dispatchable DG units, especially the energy storage units as ones with generators. When using such schedulable DG units, in the case of large fluctuations in power or load, it may affect the coordination and stability of the hybrid microgrid control

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  • Improved optimal control method for distributed hybrid microgrid
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  • Improved optimal control method for distributed hybrid microgrid

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Embodiment Construction

[0057] The present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments, and the technical problems and beneficial effects solved by the technical solutions of the present invention are also described. It should be pointed out that the described embodiments are only intended to facilitate the implementation of the present invention understood without any limitation.

[0058] Under the framework of master-slave control, the present invention provides an improved optimal control method for distributed hybrid microgrid, which is used to overcome the economical operation and voltage recovery of hybrid microgrid. figure 2 It is the physical structure diagram of the hybrid microgrid in the present invention, figure 2 In this paper, the energy storage unit is separated from the general DG unit for differential treatment and analysis. Therefore, in addition to the distributed power unit (dispatchable DG unit) with gen...

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Abstract

The invention provides an improved optimal control method for a distributed hybrid microgrid, which performs targeted and improved modeling and discriminating control for an AC-DC hybrid microgrid with an energy storage unit and other schedulable DG units, targetedly establishes problem description with an internal penalty function and a high-order model and performs discriminating control for theenergy storage unit and the other schedulable DG units according to the AC-DC conditions so as to improve the coordination consistency and energy balance and stability of the hybrid microgrid, reducethe control complexity and greatly reduce the communication between the units in the whole system.

Description

technical field [0001] The present invention relates to the technical field of hybrid microgrid control, and more specifically, to an improved optimal control method for distributed hybrid microgrid. Background technique [0002] Microgrid is composed of distributed energy, energy storage and controllable loads. Compared with pure DC or AC microgrid, hybrid microgrid combines AC microgrid and DC microgrid without redundant AC-DC power electronic conversion. device, thereby avoiding high physical costs and reducing energy conversion losses. A hybrid microgrid consists of an AC subnet, a DC subnet and a bidirectional power converter (BPC), and its structure is as follows: figure 1 shown. The AC subnet includes AC distributed generators (DG) and AC loads, and the DC subnet includes DC DGs and DC loads. Bidirectional Power Converter (BPC) can realize appropriate power interaction between two subnets according to its own control objectives, such as proportional power sharing o...

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Application Information

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IPC IPC(8): H02J4/00H02J5/00
CPCH02J4/00H02J5/00
Inventor 杨建冯文栋董密宋冬然韩华刘琦王鹏程郑成燕葛小海刘宏毅
Owner CENT SOUTH UNIV