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Intelligent control method for two-way dc-ac interconnection device of AC-DC hybrid microgrid

A DC microgrid, intelligent control technology, applied in AC networks with different sources of the same frequency, energy industry, sustainable manufacturing/processing, etc. Stability control requirements, etc.

Active Publication Date: 2019-02-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The methods proposed in the above literature are mainly aimed at a specific AC-DC hybrid microgrid operation mode, and cannot adapt to the seamless switching and stable control requirements of AC-DC hybrid microgrid multi-operating modes.

Method used

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  • Intelligent control method for two-way dc-ac interconnection device of AC-DC hybrid microgrid
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  • Intelligent control method for two-way dc-ac interconnection device of AC-DC hybrid microgrid

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Embodiment Construction

[0031] The technical solution of the present invention will be further described in detail according to the accompanying drawings in the description.

[0032] Such as figure 1 As shown, both the AC microgrid and the DC microgrid include balance units (such as energy storage, controllable distributed power, etc.) and power units (such as new energy generation, loads, etc.). In the independent operation mode of the AC-DC hybrid microgrid, the output active power and frequency steady-state characteristics of the balance unit in the AC microgrid, and the output power and DC voltage steady-state characteristics of the balance unit in the DC microgrid all satisfy the following droop characteristics:

[0033]

[0034] where ω ac , ω ac * ,P ac * and P ac_s Respectively represent the actual output frequency of the AC microgrid, the frequency reference value, the active power reference of the balance unit of the AC microgrid and the actual output active power; u dc , U dc * ,...

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Abstract

The invention belongs to the technical field of alternating-current and direct-current hybrid micro-grid device-level control, and relates to an intelligent control method for alternating-current and direct-current hybrid micro-grid bi-directional DC-AC interconnection device. An alternating-current and direct-current interconnection power autonomous control system and an alternating-current voltage / frequency control system are included, wherein rated capacity ratios of balancing units in alternating-current micro grids and direct-current micro grids are defined, the alternating-current and direct-current interconnection power autonomous control system is based on the combination of ratio control and a lead-lag compensation element, and the alternating-current voltage / frequency control system is based on drooping characteristics and an inertia simulation element. The intelligent control method can meet seamless switching and stable control requirements of alternating-current and direct-current hybrid micro-grid multiple operation modes.

Description

technical field [0001] The invention belongs to the technical field of device-level control of an AC-DC hybrid microgrid, and relates to an intelligent control method for a bidirectional DC-AC interconnection device of an AC-DC hybrid microgrid. Background technique [0002] As a new form of demand-side power supply and consumption, the AC-DC hybrid microgrid can more efficiently accept local AC / DC new energy generation systems and energy storage units, and provide high-reliability power supply for local loads. The networked AC-DC hybrid microgrid can also actively participate in auxiliary services such as local power grid optimal dispatch, reactive power control and voltage regulation, and power quality management, so as to further improve the utilization efficiency of distributed power sources and energy storage systems in the microgrid, and help To improve the power quality of local grid power supply [1-3]. AC-DC hybrid microgrid mainly includes three parts: AC microgrid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCY02P80/14
Inventor 李霞林郭力王成山
Owner TIANJIN UNIV