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Strategy for cooperatively balancing power difference of microgrid by super-capacitor and storage battery

A technology of super capacitors and batteries, applied in the direction of reducing/preventing power oscillation, to achieve safe and stable operation, improve reliability and economy

Inactive Publication Date: 2019-06-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Batteries are suitable for long-term storage, not for situations requiring quick response

Method used

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  • Strategy for cooperatively balancing power difference of microgrid by super-capacitor and storage battery
  • Strategy for cooperatively balancing power difference of microgrid by super-capacitor and storage battery

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Embodiment Construction

[0008] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0009] A strategy for balancing the power balance of the microgrid by supercapacitors and batteries, the flow chart of which is shown in figure 1 shown, including:

[0010] Monitoring steps: real-time monitoring of the current value and system frequency of each load node in the microgrid;

[0011] Control steps: If any phase current suddenly increases and the system frequency is less than the set value f min , or any phase current suddenly decreases and the system frequency is greater than the set value f max Calculate the power difference P at the same time, and determine the action strategy of the energy storage accordingly.

[0012] Among them, the power difference P = load P L -Power supply P G , according to the magnitude of the absolute value P of the power difference, determine how the energy storage operates: when P>0, the energy storage is discharged, a...

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Abstract

The invention relates to a strategy for cooperatively balancing a power difference of a microgrid by a super-capacitor and a storage battery. According to the strategy, an absolute value |P| of the power difference is calculated according to current values of load nodes, monitored in real time and a sudden change quantity of a system frequency; charging or discharging is carried out by the super-capacitor when the |P| is relatively large; and the charging or discharging is carried out by the storage battery when the |P| is relatively small. According to the strategy, the complementary characteristics of the super-capacitor and the storage battery in energy density and power density can be brought into full play, and stable and reliable operation of the microgrid is realized.

Description

technical field [0001] The invention relates to a strategy for balancing the power balance of a microgrid coordinated by a supercapacitor and a storage battery, and belongs to the technical field of microgrid control. Background technique [0002] A typical microgrid system is mainly composed of a variety of distributed power generation units, energy storage devices and loads, and a central energy management system controls the power generation scheduling in the microgrid. The microgrid can realize the flexible and efficient application of distributed power. The operation of microgrid can be divided into island operation mode and grid-connected operation mode. In the island operation mode, the main responsibility of the energy storage system is to balance supply and demand. In the grid-connected operation mode, the main goal of the energy storage system is to avoid the impact of intermittent renewable energy generation and load fluctuations on the main grid. [0003] Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 王植杨晓华俞子聪朱永强夏瑞华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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