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A method for selecting the capacity of energy storage devices in a grid-connected microgrid

A technology of energy storage device and microgrid, which is applied in the direction of circuit device, AC network circuit, AC network load balancing, etc., and can solve unconsidered problems

Inactive Publication Date: 2021-12-17
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing grid-connected microgrid energy storage capacity optimization selection method does not consider the influence of demand side response on the energy storage capacity selection under the independent operation mode of the microgrid.

Method used

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  • A method for selecting the capacity of energy storage devices in a grid-connected microgrid
  • A method for selecting the capacity of energy storage devices in a grid-connected microgrid
  • A method for selecting the capacity of energy storage devices in a grid-connected microgrid

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Embodiment

[0076] use as figure 1 The shown microgrid performs the selection of energy storage capacity in stand-alone operation mode:

[0077] In the microgrid of this embodiment, the rated output power of the photovoltaic system is 40kW; the maximum load capacity S load =40kVA, power factor is 0.95, important load P A , Interruptible load P B and a translatable load P C The proportions are 30%, 35% and 35% respectively, the P A ,P C The sum of the power is denoted as P A+C , the P B According to the number of circuit breakers that can be independently broken, it is divided into 2 levels, denoted as: P B ={P B1 ,P B2}, where P B1 ,P B2 The proportions are 40% and 60% respectively. Select the power reference value P jz =50kW, under sunny and cloudy weather conditions, the 24h maximum power prediction curve of the photovoltaic power generation system and load during the independent operation of the microgrid is as follows image 3 and Figure 4 shown.

[0078] In order to ...

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Abstract

The invention discloses a method for selecting the capacity of an energy storage device in a grid-connected microgrid, which includes calculating the power W of the energy storage device after the discharge period I is completed. ES (t 1 ) and the power W after the completion of the discharge period II ES (t end ); According to the electric quantity W after the completion of the discharge period I ES (t 1 ) and the power W after the completion of the discharge period II ES (t end ) Steps for selecting the rated capacity of the energy storage device. The grid-connected microgrid energy storage capacity configuration method of the present invention can select the optimal energy storage capacity of the energy storage device under the condition of ensuring stable load power supply in the independent operation mode of the microgrid.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to a method for selecting energy storage capacity in a grid-connected microgrid, in particular to a method for considering demand-side response in design planning and energy storage capacity configuration of a grid-connected microgrid The selection method of the energy storage device capacity after load translation. Background technique [0002] In the microgrid, due to the fluctuation and intermittency of the renewable distributed generation (distributed generation, DG) output, it is usually necessary to configure an energy storage device with a certain capacity to balance the power supply. Stable, reliable and economical operation is essential. For the grid-connected microgrid composed of regenerative distributed power supply DG, energy storage and load, most of the existing energy storage capacity selection methods only consider the grid-connected operation mode to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32
CPCH02J3/32H02J2203/20
Inventor 王海燕同向前
Owner XIAN UNIV OF TECH