A hierarchical optimization method for regional distribution network with microgrid

An optimization method and microgrid technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems affecting the effectiveness of traditional optimization algorithms, the inability to guarantee the global optimality of the system, and the inability to realize microgrids and distribution networks, etc. question

CN103544655BActive Publication Date: 2017-02-08STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-02-08

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Abstract

The invention relates to an optimization method in the field of power system automation, in particular to a layered optimization method of a regional distribution network comprising a micro-grid. The method includes the following steps: (1) building a micro-grid and distribution network combined dispatching model; (2) building an efficiency-maximizing secondary dispatching model of the micro-grid; (3) optimizing the two dispatching models. According to the method, the micro-grid is taken as a controllable unit capable of dispatching independently; through coordinated dispatching of a controllable distributed power supply on the distribution network side, the micro-grid and the distribution network and bi-layer dispatching control of economic dispatch of distributed energy resources inside the micro-grid, the distributed energy resources are used in a maximized manner internally, the regional distribution network power supply and loads are dispatched optimally externally, and acceptance capability of the distraction network to the distributed power supply can be effectively improved.
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Description

technical field

[0001] The invention relates to an optimization method in the field of electric power system automation, in particular to a layered optimization method for a regional distribution network including a microgrid. Background technique

[0002] (1) Microgrid technology

[0003] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. The power sources in the microgrid are mostly distributed power sources with small capacity, that is, small units with power electronic interfaces, including micro gas turbines, fuel cells, photovoltaic cells, small wind turbines, and energy storage devices such as supercapacitors, flywheels, and batteries. They are connected to the user side and have the characteristics of low cost, low voltage and little pollution.

[0004] The application of micro-grid technology eliminates th...

Examples

Embodiment Construction

[0131] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0132] The schematic diagram of the hierarchical scheduling framework provided by the present invention is as follows figure 1 As shown, the hierarchical optimal dispatching method of the regional distribution network including microgrids includes: the distribution network dispatching center conducts joint dispatching with other power generation companies in the power grid according to the purchase and sale price, upper and lower limits of output and other information provided by each microgrid. The power generation plan is determined with the goal of maximizing the company's benefits; the power grid company does not care about the energy management inside the microgrid, it only needs to compensate the power provided by the microgrid and charge for the power purchased by the microgrid; due to the power generation characte...