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DC micro grid bus voltage control strategy based on hybrid energy storage

A DC bus voltage, bus voltage control technology, applied in the field of DC microgrid bus voltage control strategy, to achieve the effect of suppressing DC bus voltage fluctuations, good application prospects, and improving the stability of DC bus voltage

Inactive Publication Date: 2016-03-23
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that there is no control strategy for DC micro-grid bus voltage to suppress the DC bus voltage fluctuation and ensure the stability of DC micro-grid bus voltage

Method used

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  • DC micro grid bus voltage control strategy based on hybrid energy storage
  • DC micro grid bus voltage control strategy based on hybrid energy storage
  • DC micro grid bus voltage control strategy based on hybrid energy storage

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] The DC microgrid bus voltage control strategy based on hybrid energy storage of the present invention is suitable for DC microgrid structures with hybrid energy storage. The hybrid energy storage is a hybrid energy storage combined with supercapacitors and batteries, where intermittent DG loads and The hybrid energy storage is connected to the micro-grid AC busbar, and the entire micro-grid is connected to the distribution network through the static switch of the PCC point. The hybrid energy storage system is composed of supercapacitors and batteries. The combination of the two can effectively improve the overall performance of the energy storage system to stabilize the DC bus voltage, such as figure 1As shown, the supercapacitor and the battery are respectively connected to the DC bus of the hybrid energy storage through a bidirectional DC / DC circuit. The acti...

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Abstract

The invention discloses a DC micro grid bus voltage control strategy based on hybrid energy storage. By use of high power density of a super capacitor and a high-energy-density feature of a storage battery, according to a voltage change rate of DC bus voltages, the bus voltages are processed segment by segment under different voltage conditions, the DC bus voltage stability is improved through two different energy storage control strategies, variation of the DC bus voltages can be inhibited, the satiability of the DC micro grid bus voltages is ensured, and the application prospect is good.

Description

technical field [0001] The invention relates to the technical field of power quality management of distributed power generation and energy supply systems, in particular to a DC micro-grid bus voltage control strategy based on hybrid energy storage. Background technique [0002] In recent years, under the dual pressure of energy demand and environmental protection, distributed power generation technology has gained more and more attention and application. However, a large number of distributed power sources (Distributed Generator, DG), such as solar cells, fuel cells, wind turbines and small gas turbine cogeneration, etc., are affected by natural conditions, and the output of renewable energy such as wind power and photovoltaics has a large intermittent and randomness, which have adverse effects on the power quality and stable operation of the microgrid. [0003] The direct grid connection method will have a significant impact on the grid peak regulation and the safe operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/14
CPCH02J1/14
Inventor 柳丹袁晓冬李强吕振华
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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