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Selection method of energy storage device capacity in grid-connected micro grid

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

Active Publication Date: 2018-09-28
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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  • Selection method of energy storage device capacity in grid-connected micro grid
  • Selection method of energy storage device capacity in grid-connected micro grid
  • Selection method of energy storage device capacity in grid-connected micro grid

Examples

Experimental program
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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 selection method of energy storage device capacity in a grid-connected micro grid. The selection method comprises the following steps: respectively computing the battery WES(t1) of the energy storage device after the discharging time interval I is accomplished and the battery WES (tend) of the energy storage device after the discharging time interval II is accomplished;and selecting the rated capacity of the energy storage device according to the battery WES (t1) after the discharging time interval I is accomplished and the battery WES (tend) after the discharging time interval II is accomplished. Through the grid-connected micro grid energy storage capacity configuration method disclosed by the invention, the optimal energy storage capacity, capable of guaranteeing the stable power supply of the load, of the energy storage device is selected under the independent running mode of the micro grid.

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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IPC IPC(8): H02J3/32
CPCH02J3/32H02J2203/20
Inventor 王海燕同向前
Owner XIAN UNIV OF TECH