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System and method for controlling power of micro-grid grid-connected tie line

A tie-line power and control system technology, applied in the field of micro-grid, can solve problems such as not considering the state of charge of the battery, affecting the service life of the battery, and affecting the stability of the grid, so as to achieve complementary wind and solar, smooth fluctuations, and improve flexibility and dynamics. performance effect

Inactive Publication Date: 2019-06-04
DAQO GROUP CO LTD +1
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Problems solved by technology

However, in this solution, the energy storage system adopts the basic filter control method, without considering the state of charge of the battery, which will affect the service life of the battery on the one hand, and cause violent fluctuations in the power injected into the grid on the other hand, affecting the stability of the grid

Method used

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  • System and method for controlling power of micro-grid grid-connected tie line
  • System and method for controlling power of micro-grid grid-connected tie line
  • System and method for controlling power of micro-grid grid-connected tie line

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The invention relates to a smooth control method for the tie line power of a microgrid including distributed power sources such as wind, light, and storage when running in grid connection. The control method is based on the collected distributed power output, local load power, and tie line Power, real-time calculation of the fluctuation rate of tie-line power during grid-connected operation, and formulate charging and discharging strategies for the energy storage system based on this. The control method can stabilize the fluctuation of the distributed power supply when the microgrid is connected to the grid, and ensures the reliability and stability of the microgrid.

[0034] In view of the problems existing in the grid-connected micro-grid, the purpose of the present invention is to provide a smooth change of the exchange power betwee...

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Abstract

The invention discloses a system and method for controlling the power of a micro-grid grid-connected tie line. The method comprises the steps that: a micro-grid central controller collects electricalquantities of a micro-grid and a tie line; the relationship between a protocol power PAgr and a micro-grid net load Pnet is judged, the predicted value of the protocol power PAgr is given by an energymanagement system, if the energy management system does not give a value, the value of the protocol power Pagr is an average value of the micro-grid net load Pnet in the time Delta t, when Pagr is larger than Pnet, the micro-grid central controller issues a command to a battery management system to adjust the output of an energy storage unit, the output value of the energy storage unit is PB=Pagr-Pnet, when Pagr is smaller than or equal to PNet, the micro-grid central controller issues a command to the battery management system to stop the output of the energy storage unit, and the charging of the energy storage unit is started. The system and method have the advantages of quick response, simple scheme and good stability.

Description

technical field [0001] The invention relates to the field of micro-grid technology, in particular to a control system and method for the power of a grid-connected tie line of a micro-grid. Background technique [0002] In recent years, with the rapid development of the economy, the demand for energy has increased sharply, and distributed power generation technology has received extensive attention due to its high energy utilization rate and low pollution. Microgrid as its technical support has also received the same attention. The microgrid system combines distributed power sources, loads, energy storage devices and control systems to form a small power system. The microgrid and the large power grid can support each other. At the same time, the flexibility of the microgrid enables it to operate in both grid-connected and isolated ways. Grid-connected operation can largely ensure the safe operation of the microgrid, but its relationship with the distribution network Tie line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/24
CPCH02J3/32H02J3/38H02J3/241
Inventor 徐运兵盛德刚戴罡裴军徐大可
Owner DAQO GROUP CO LTD
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