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Electric energy device used for adjusting hybrid power of intermediate voltage power system

A power system, hybrid power technology, applied in circuit devices, reactive power adjustment/elimination/compensation, electrical components, etc., can solve problems such as no suppression, and achieve the effects of easy operation, comprehensive functions, and small footprint

Inactive Publication Date: 2014-02-05
DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of system does not have the function of suppressing the fluctuation of the active power output by the wind farm

Method used

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  • Electric energy device used for adjusting hybrid power of intermediate voltage power system
  • Electric energy device used for adjusting hybrid power of intermediate voltage power system
  • Electric energy device used for adjusting hybrid power of intermediate voltage power system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Such as figure 1 In the figure shown, the number of cascades is N=3. For the convenience of the experiment, the parameters of the power grid and the device are as follows:

[0033]

[0034] In the MATLAB simulation environment, the simulation results obtained according to the working principle and work engineering are as follows:

[0035] 1. During active power control, since the output power of the wind farm fluctuates and the frequency changes, while the output power to the grid is smooth, the active power that the electric energy device needs to absorb and release is also fluctuating, such as Figure 3a As shown; while the battery pack is charged according to the established optimal current curve, so the absorbed power is smooth, such as Figure 3c shown; Figure 3d Shown is the active power absorbed by the battery pack after the time axis is enlarged; the instantaneous fluctuating active power or short-term active power is absorbed by the capacitor bank, such a...

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Abstract

The invention discloses an electric energy device used for adjusting hybrid power of an intermediate voltage power system, and relates to the technical field of power electronics. Three phase cascading units are in star connection; each phase cascading unit is composed of n full-bridge inversion units, n large capacitor banks, n automatic switches and n battery pack units, the n full-bridge inversion units are connected in series, the head end of the first full-bridge inversion unit of each cascading unit is connected with a corresponding electric reactor, and the tail end of the nth full-bridge inversion unit of each cascading unit is connected with the tail ends of the nth full-bridge inversion units of other two cascading units; intermediate voltage grid connection is achieved due to the fact that the multiple single-phase full-bridge inversion units are cascaded, reactive power and transient-variation active power are adjusted through large capacitors on a direct-current bus of each unit, and slow-variation active power is adjusted through the battery pack units on the direct-current bus of each unit; besides, a grid connection transformer is not needed, little floor space is occupied, and the device is easy to maintain.

Description

Technical field: [0001] The invention relates to the technical field of power electronics, in particular to an electric energy device used for hybrid power adjustment of a medium-voltage power system. Background technique: [0002] As a clean energy, wind power has developed rapidly in recent years. Since wind energy is variable in nature, the active power generated by the wind power generation system is also fluctuating. With the increasing capacity of wind farms connected to the grid, this fluctuation will cause serious power quality problems and endanger the stable operation of the grid. Therefore, a wind power generation system needs to be equipped with a power device capable of regulating active power and suppressing fluctuations in electric energy. [0003] In addition, when a disturbance or fault occurs in the grid, the wind farm generally needs to have sufficient dynamic reactive power support capability for the grid, that is, to send reactive power to the grid, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/18H02J3/00
CPCY02E40/30
Inventor 万承宽付权伟张川唐斌赖成毅彭良平
Owner DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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