Power capacity allocation method of grid-connected microgrid

A technology of power supply capacity and configuration method, which is applied in the field of microgrid, can solve the problems of only considering the economy, failing to meet the design requirements, and the design model not fully considering the uncertainty of wind power output, etc.

Active Publication Date: 2017-05-10
POWERCHINA ZHONGNAN ENG
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Problems solved by technology

[0005] The existing grid-connected microgrid capacity planning and design methods mostly only consider economical efficiency, and do not take the self-supply capability of the system as one of the design goals (the self-supply capability determines the reliability of the power supply after the system is transferred to the island operatio

Method used

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Experimental program
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Embodiment approach

[0043] One embodiment of the present invention comprises the following steps:

[0044] In step A, build the fan model, photovoltaic cell model and storage battery model in the grid-connected microgrid in the simulation software (HOMER software). The modeling of these three is an existing mature technology.

[0045] The fan model is as follows:

[0046]

[0047] where P W is the output power of the fan; P Wr is the rated output power of the fan; V ci is the cut-in wind speed; V co is the cut-out wind speed; V r is the rated wind speed.

[0048] The photovoltaic cell model is as follows:

[0049]

[0050] In the formula, G is the light intensity; P STC Under standard test conditions (light intensity is 1KW / m 2 , ambient temperature is 25℃) maximum output power; G STC Is the light intensity under standard test conditions, and η is the system efficiency related to the surface temperature of the solar panel.

[0051] The battery model is as follows:

[0052]

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Abstract

The invention discloses a power capacity allocation method of a grid-connected microgrid. The method comprises the steps of (A) building a wind turbine model, a photovoltaic cell model and a storage battery model in the grid-connected microgrid; (B) building a capacity design optimization objective function model, wherein a capacity design optimization objective function comprises annual average composite cost C<ACT> and a self-equilibrium coefficient SSR; (C) solving the capacity design optimization objective function by using a stochastic simulation-based NSGA-II algorithm to obtain a pareto frontier; and (D) selecting a preferred plan meeting the design requirements from the pareto frontier by using a utility theory. According to the power capacity allocation method, the economy and the self-powered capability are taken into account while the wind and light output uncertainty is considered, and the optimum numbers of wind turbines, photovoltaic cells and storage batteries can be determined according to the design requirements.

Description

technical field [0001] The invention belongs to the field of micro-grids, and in particular relates to a method for configuring power supply capacity of grid-connected micro-grids. Background technique [0002] Microgrid refers to a small power generation and distribution system that is composed of distributed generation (Distributed Generation, DG), energy storage devices, energy conversion devices, load monitoring, protection devices, etc., and can realize self-control, protection and management. Existing studies have shown that connecting various distributed power sources in the form of microgrids is an effective way to exert their effectiveness. [0003] The microgrid can effectively integrate various distributed power sources, energy storage units and loads. Through the comprehensive utilization of different output characteristics DG and energy storage systems, it overcomes the problems caused by the randomness and volatility of new energy power generation and improves ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/38H02J3/383H02J3/386H02J2203/20Y02B10/10Y02B10/30Y02E10/56Y02E10/76
Inventor 刘峪涵
Owner POWERCHINA ZHONGNAN ENG
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