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Droop control method and droop control system in multi-micro power grid interconnection scene

A control method and multi-microgrid technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as the inability to reflect the power generation cost of microgrids, and achieve the effect of low dynamic power generation costs

Active Publication Date: 2015-11-25
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a droop control method and system in a multi-microgrid interconnection scenario for the problem that the existing technology cannot reflect the power generation cost of each microgrid

Method used

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  • Droop control method and droop control system in multi-micro power grid interconnection scene
  • Droop control method and droop control system in multi-micro power grid interconnection scene
  • Droop control method and droop control system in multi-micro power grid interconnection scene

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and example, the present invention will be further described.

[0026] attached figure 1 It is a flowchart of a droop control method in a multi-microgrid interconnection scenario, and the method may include the following steps:

[0027] Step S1: Measure the actual exchange power value between the microgrids;

[0028] Step S2: Calculate the deviation between the actual exchange power value and the preset exchange power value, if the deviation exceeds the preset deviation allowable value, set the deviation as the control reference deviation of the microgrid;

[0029] Step S3: Set the slight increase rate of power generation cost according to the control reference deviation, and calculate the power correction amount of each converter in the microgrid according to the slight increase rate, and the power correction amount is the amount to be allocated by each converter The correction amount of exchange power;

[0030] Step S4...

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Abstract

The present invention relates to a droop control method in a multi-micro power grid interconnection scene. The method includes the steps as follows: measuring an actual exchange power value among micro power grids; calculating a deviation between the actual exchange power value and a pre-set exchange power value, if the deviation exceeds a pre-set deviation permissible value, the deviation is set as a control reference deviation of the micro power grids; setting a tiny increasing rate of a generating cost according to the control reference deviation, and calculating power modification values of various converters in the micro power grids according to the tiny increasing rate; calculating exchange power planned values of the various converters according to the power modification values, and comparing the exchange power planned values of the various converters with a maximum power permissible value set by the converters, if one exchange power planned value of one converter exceeds the maximum power permissible value set by the converters, correcting the control reference deviation and returning the previous step; otherwise, executing the net step: modifying the droop control reference power of the converters as the maximum power permissible value.

Description

technical field [0001] The present invention relates to the technical field of power system control, in particular to a droop control method and system in a multi-microgrid interconnection scenario. Background technique [0002] The emergence and development of the Energy Internet will realize the extensive and efficient utilization of distributed renewable energy and alleviate the pressure on energy and the environment. In order to overcome the uncontrollability of a large number of distributed power sources connected to the grid alone, various distributed renewable power sources such as wind, light, and biomass can be effectively integrated with energy storage systems in the form of micro-grids. Through reasonable structure and control strategy to form independent and controllable power generation and power supply units to meet power distribution planning and user requirements for power quality and power supply reliability. [0003] With the increase of micro-grids, under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/46
Inventor 郭晓斌李鹏许爱东雷金勇于力喻磊申展刘念李岩松
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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