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Precision scheduling method of distributed power supply in microgrid

A technology of distributed power supply and scheduling method, which is applied to electrical components, circuit devices, AC network circuits, etc., and can solve problems such as source-grid-load dynamic power imbalance.

Active Publication Date: 2018-09-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problem of source-network-load dynamic power unbalance caused by grid-connected distributed renewable power sources under the load environment and the shortcomings of existing methods, the purpose of the present invention is to propose a new method for precise control of distributed power sources in microgrids method

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  • Precision scheduling method of distributed power supply in microgrid
  • Precision scheduling method of distributed power supply in microgrid
  • Precision scheduling method of distributed power supply in microgrid

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Embodiment Construction

[0041] Below in conjunction with this accompanying drawing, the specific embodiment of the present invention is described:

[0042] figure 1 It is a distributed system diagram with four distributed power sources. There are four DGs (distributed power sources) in the system, and each DG can be solar power generation, wind power generation, fuel cell or gas turbine, etc. Each DG has a controller, and the controller can communicate with adjacent nodes and can only communicate with adjacent nodes. exist figure 1 In the distributed system, there is no central controller, the status of each distributed power supply is equal, and there is no master-slave relationship.

[0043] Step 1: When the microgrid operates in Scenario 1, attach figure 1 As an example to illustrate:

[0044] Step 1-1: There is no access or withdrawal of distributed power in the system, the system is in a stable state, and the economic function F is constructed i (P i )=α i +β i P i +γ i P i 2 , where...

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Abstract

The invention provides a precision scheduling control method of a distributed power supply in a microgrid. An equivalent frequency control method is embedded in a conventional economic scheduling method to enable power balance conditions to be met under output fluctuation or load fluctuation of the distributed power supply, thereby realizing precise scheduling of the distributed power supply in the microgrid. In such control method, active power and reactive power required by load and the active power and reactive power output by a power generator are balanced; compared with a periodic economic scheduling method in a conventional centralized power system, the method can guarantee precise control of economic scheduling of the micro grid under different operating scenarios; meanwhile, in such control method, different control methods can be applied to meet special control requirements; and the robust economic control method can keep the whole system running under the economic optimum condition when communication failure occurs in a micro grid unit, thereby achieving precise control of micro grid economic dispatch.

Description

technical field [0001] The invention belongs to the technical field of distributed dispatching of microgrid systems, and in particular relates to precise dispatching of distributed power sources in microgrids. Background technique [0002] Economic dispatch is one of the most important issues in the power system. Economic dispatch can ensure that the power system operates under the most economical conditions. The traditional economic dispatch method is mainly designed for the centralized power system. In the centralized power system, the central controller needs to calculate the power output reference value for each generator, and balance the demand power and output power in the system. Realize precise control of centralized power system dispatching. In recent years, due to the development of renewable energy, more and more distributed power sources have been installed in the power system, forming a microgrid. In the microgrid, due to the lack of a central controller and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/38
CPCH02J3/381H02J3/46
Inventor 闫士杰肖艳辉高文忠杨娇张坤
Owner NORTHEASTERN UNIV
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