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Wind power generation grid connection stored energy adjusting device

A technology for regulating devices and energy storage, applied in wind power generation, energy storage, AC network load balancing, etc., can solve problems affecting the normal operation of frequency-sensitive loads in the power grid, and achieve the effects of easy promotion, reduced complexity, and high energy efficiency

Inactive Publication Date: 2013-01-02
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The random fluctuation of its output power will also have a significant impact on the frequency of the grid, which in turn will affect the power quality of the grid and the normal operation of frequency-sensitive loads in the system

Method used

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  • Wind power generation grid connection stored energy adjusting device
  • Wind power generation grid connection stored energy adjusting device
  • Wind power generation grid connection stored energy adjusting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, in the wind farm distributed energy storage regulation device provided by the first preferred embodiment of the present invention, a wind farm energy storage regulation system is set between each wind turbine and grid-connected transformer in the wind farm to detect wind power The output voltage and current signals of the generator and the voltage and current signals of the power grid; the signal control terminal of the wind turbine is connected to a central energy storage control system 2; the central energy storage control system 2 communicates with a lithium-ion battery pack system 1 and A grid-connected bidirectional inverter 3 is connected; the lithium-ion battery pack system 1 is connected in parallel at the connection between the output terminal of the wind turbine and the grid-connected transformer through the grid-connected bidirectional inverter 3; the grid-connected bidirectional inverter 3 is connected to the voltage of the wind tur...

Embodiment 2

[0030] Such as figure 2 As shown, in the wind farm centralized energy storage adjustment device provided by the second preferred embodiment of the present invention, compared with Embodiment 1, the difference is that the number of energy storage adjustment devices is also changed from multiple to single, That is, from distributed to centralized, the power level of the lithium-ion battery system will also increase accordingly. The grid-connected position of the energy storage adjustment device is changed, the power output terminal is connected in parallel with the output terminal of the grid-connected bidirectional inverter, and the signal control terminal is connected in parallel with the signal input terminal of the central energy storage control system. In this embodiment, the energy storage adjustment system absorbs or compensates the grid-connected power of the entire wind farm at the same time, so as to improve the adverse impact on the grid when the entire wind farm is ...

Embodiment 3

[0032] Such as image 3 As shown, in the wind farm energy storage regulating device provided by the third preferred embodiment of the present invention, there may be multiple wind turbines, and their power output terminals are connected in parallel with the output terminals of the grid-connected bidirectional inverter through a transformer; the signal control terminal and The signal input terminals of the central energy storage control system are connected in parallel. In this embodiment, the energy storage adjustment system absorbs or compensates the grid-connected power of the entire wind farm at the same time, so as to improve the adverse impact on the grid when the entire wind farm is connected to the grid. This example uses the figure 1 Similar data transmission modes and control strategies in the embodiments.

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Abstract

The invention discloses a stored energy adjusting device for wind power plants and particularly relates to a wind power generation grid connection stored energy adjusting device. The stored energy adjusting device comprises one or more lithium-ion battery pack systems, a central stored energy control system and one or more bi-direction inverter devices, the central stored energy control system performs information interaction with a fan controller, the lithium-ion battery pack systems and the bi-direction inverter devices, and a bi-direction inverter is used for controlling power of the lithium-ion battery pack systems so as to control and compensate output forces of the wind power plants. According to the stored energy adjusting device, problems of power fluctuation and intermittency during grid connection of the wind power plants can be solved, forecast errors of wind power are compensated, and the wind power plants are assisted to achieve functions of low voltage ride-through, power frequency control and rotating backup; and the stored energy adjusting device has the advantages of being capable of improving performances during grid connection of the wind power plants, stabilizing power output of the wind power plants, prolonging service life of mechanical and electrical devices of the systems and guaranteeing stability of power grids and force output of the wind power plants.

Description

technical field [0001] The invention relates to a grid-connected energy storage regulating device for wind power generation. Background technique [0002] Due to the randomness, intermittentness and uncontrollability of wind, traditional wind power generation will cause many adverse effects on grid security, stability, scheduling and other aspects when transmitting green power to the grid. Voltage fluctuations and flicker caused by changes in wind speed, fan switching, wind turbulence, etc. will lead to poor grid voltage stability; when the wind speed is too high, the wind turbines will cause power loss due to safety protection, which is easy in weak grids. Cause instantaneous voltage drop and power frequency fluctuation, affecting the safety of the power grid; in the case of instantaneous voltage flicker in the power grid, the traditional wind power generation technology cannot realize the low-voltage ride-through function, causing the wind turbine to cut off the grid due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCY02E10/763Y02E70/30Y02E10/766Y02E10/76
Inventor 冯毅刘辉朴海国张邦玲解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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