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Charging and discharging circuit and method for energy storage battery of wind turbine generator

A charge-discharge circuit and energy storage battery technology, applied in battery circuit devices, wind power generation, circuit devices, etc., can solve problems such as high simultaneous coefficients of wind turbines and wind farms, low predictability and certainty, and intermittent wind power energy, etc., to achieve The effect of improving service life, increasing redundancy and backup, and reducing volatility

Pending Publication Date: 2022-01-04
东方电气风电股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a charging and discharging circuit and method for the energy storage battery of a wind turbine, which solves the problems of intermittent wind power energy, low predictability and low certainty in the prior art, and is necessary for a planable and dispatchable power grid. The impact is very large, and the simultaneous coefficient of wind turbines and wind farms is relatively high.

Method used

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  • Charging and discharging circuit and method for energy storage battery of wind turbine generator
  • Charging and discharging circuit and method for energy storage battery of wind turbine generator
  • Charging and discharging circuit and method for energy storage battery of wind turbine generator

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Experimental program
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Embodiment 1

[0046] Such as Figure 1 to Figure 3 As shown, a wind turbine energy storage battery charging and discharging circuit includes a DC link of a converter, a first group of secondary charging and discharging units, a second group of secondary charging and discharging units, a first bypass charging and discharging unit, a second road bypass charging and discharging unit, energy storage battery, the DC link of the converter and the energy storage battery pass through the first group of secondary charging and discharging unit, the second group of secondary charging and discharging unit, the first bypass charging The discharge unit and the second bypass charging and discharging unit are electrically connected to form four parallel branches.

[0047] When working, the following charging and discharging methods can be used:

[0048] When the wind turbine is running normally, the DC link of the converter charges the energy storage battery through the first group of the secondary chargi...

Embodiment 2

[0080] Such as Figure 1 to Figure 3 As shown, as a further optimization of Embodiment 1, this embodiment includes all the technical features of Embodiment 1. In addition, this embodiment also includes the following technical features:

[0081] A method for charging and discharging an energy storage battery of a wind turbine, using the described circuit for charging and discharging an energy storage battery of a wind turbine, including the following charging and discharging methods:

[0082] When the wind turbine is running normally, the DC link of the converter charges the energy storage battery through the first group of the secondary charging and discharging unit or the second group of the secondary charging and discharging unit, and the energy storage battery passes through the first group or the second group of the secondary charging and discharging unit. The second group of charging and discharging units of the first stage discharges the DC link of the converter; thus, t...

Embodiment 3

[0093] Such as Figure 1 to Figure 3 As shown, this embodiment includes all the technical features of Embodiment 1 and Embodiment 2. On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a more detailed implementation mode.

[0094] When the wind turbine converter 1 is in normal operation, the DC link E of the converter is used c0 4 Bypass energy storage battery E 12 16 and the first group 10 of the "ferry" type secondary charging and discharging unit and the second group 11 of the secondary charging and discharging unit; When setting the value, the DC link E of the converter is used c0 4 Through the first group of 10 supercapacitors C of the secondary charging and discharging unit 1 12 or secondary charge and discharge unit second group 11 supercapacitor C 2 13 Indirect pair energy storage battery E 12 16 Charging; when the frequency of the wind turbine on-grid power system is less than the rated frequency and the DC bus voltage is less than the rated v...

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PUM

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Abstract

The invention discloses a charging and discharging circuit and method for an energy storage battery of a wind turbine generator, and the charging and discharging circuit comprises a converter DC link, a first group of secondary charging and discharging units, a second group of secondary charging and discharging units, a first bypass charging and discharging unit, a second bypass charging and discharging unit, and an energy storage battery. The converter DC link is electrically connected with the energy storage battery through the first group of the secondary charging and discharging units, the second group of the secondary charging and discharging units, the first bypass charging and discharging unit and the second bypass charging and discharging unit to form four parallel branches. The method solves the problems that in the prior art, wind power energy is intermittent, predictable certainty is low, impact on a plannable and schedulable power grid is large, and the simultaneous coefficient of a wind turbine generator and a wind power plant is high.

Description

technical field [0001] The invention relates to the technical field of wind power generation energy storage, in particular to a charging and discharging circuit and method for an energy storage battery of a wind turbine. Background technique [0002] New energy wind turbines account for a large proportion of China's power system, and doubly-fed wind turbines currently account for about 50% of the global wind turbine assembly. While domestic new energy installed capacity and operating capacity are increasing, a high proportion of wind power energy in the grid enters the load center of the grid. The wind power energy is intermittent, not completely predictable and deterministic, and has a great impact on the planable and dispatchable power grid. In addition, the simultaneity coefficient of wind turbines is high, while the equivalent capacity coefficient of wind farms is low. Generally, the equivalent capacity is 1 / 3 of the installed capacity of wind turbines. Therefore, how to...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J3/38H02J3/24H02J7/00
CPCH02J3/32H02J3/381H02J3/24H02J7/0068H02J7/345H02J2300/28Y02E10/76Y02E70/30
Inventor 成健郑大周毛忠兴刘桦兰礼付华强魏万明薛渊博袁钰杰黄树根谭昱霖郭春林王鹏坤
Owner 东方电气风电股份有限公司