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A Hierarchical Control Method for AC-DC Hybrid Microgrid Based on Power Price

An AC-DC hybrid, layered control technology, applied in a single AC network with different frequencies, AC network load balancing, power network operating system integration, etc. Plug and play and other issues to achieve the effect of reducing electricity costs, ensuring power supply reliability, and smooth switching

Active Publication Date: 2017-11-21
JIANGSU DAYBRIGHT INTELLIGENT ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control structure has high requirements on the central controller and communication equipment. Once a certain link fails, it may affect the normal operation of the system, which is not conducive to ensuring the reliability of power supply and realizing "plug and play" of equipment.

Method used

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  • A Hierarchical Control Method for AC-DC Hybrid Microgrid Based on Power Price
  • A Hierarchical Control Method for AC-DC Hybrid Microgrid Based on Power Price
  • A Hierarchical Control Method for AC-DC Hybrid Microgrid Based on Power Price

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1: The bus voltage control layer connects the scattered converter units into a whole through the common DC bus, uses the DC bus voltage signal to arrange the power exchange of each unit in an orderly manner, realizes the power balance in the DC system, and ensures the DC bus voltage at the same time within reason. Such as figure 1 The illustrated embodiment converts the DC link voltage U dc The range of change is divided into 4 voltage intervals, and the voltage value of the boundary line is U from high to low. 3_H , U 2_H , U 1_H , U 1_L , U 2_L , when the DC bus voltage U dc fall into the interval [U 2_H ,U 3_H ], the bus voltage control layer works in mode 3, and the distributed generation unit switches to the slack terminal; when the DC bus voltage U dc fall into the interval [U 1_H ,U 2_H ] and interval [U 2_L ,U 1_L ], the bus voltage control layer works in mode 2, and the grid-connected converter switches to the slack terminal; when the DC...

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Abstract

The invention provides an alternating-current / direct-current hybrid micro-grid layered control method based on electricity price. The control for an alternating-current / direct-current hybrid micro-grid is divided into three layers such as a converter control layer, a bus voltage control layer and a power scheduling layer. On the bottom converter control layer, all kinds of converters are divided into energy terminals and relax terminals according to control objectives thereof; on the middle bus voltage control layer, any unit in the alternating-current / direct-current hybrid micro-grid can smoothly adjust the output power of an interface converter thereof according to a direct-current bus voltage signal under a same control structure, so that dispersion autonomous operation of the alternating-current / direct-current hybrid micro-grid is realized; on the upper power scheduling layer, a grid-connected converter decides a specific operating state according to time-of-use electricity price information on an alternating-current grid side, and then the output power of an energy storage unit is changed so as to make full use of remaining capacity thereof and improve the economy and schedulability of system operation.

Description

technical field [0001] The invention relates to the technical field of distributed power generation microgrids, in particular to a hierarchical control method for AC / DC hybrid microgrids based on electricity prices. Background technique [0002] With the continuous improvement of users' attention to power supply reliability and power quality and the extensive use of various forms of renewable energy such as solar energy and wind energy, microgrids, as an effective way for distributed power to connect to the grid, have attracted widespread attention from scholars at home and abroad. . Microgrid generally refers to a small grid form that connects various distributed power sources, energy storage devices and loads through power electronic devices. isolated system running. [0003] Compared with AC microgrids, DC microgrids have many distinctive features. First of all, most distributed power sources, such as photovoltaic cells and wind generators, basically output DC power (o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/02H02J3/12H02J3/28H02J3/38
CPCH02J3/02H02J3/12H02J3/28H02J3/381H02J3/388H02J2203/20H02J2310/64Y02B70/3225Y04S20/222
Inventor 王国华高明
Owner JIANGSU DAYBRIGHT INTELLIGENT ELECTRIC CO LTD
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