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Controller for static reacance generator

A control device, static reactive power technology, applied in the output power conversion device, reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve problems such as loss

Inactive Publication Date: 2003-02-12
ZHUZHOU TIMES ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, the device itself has a certain loss. To maintain the stability of the DC bus voltage of each bridge, a certain amount of active power must be absorbed from the grid.

Method used

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  • Controller for static reacance generator
  • Controller for static reacance generator
  • Controller for static reacance generator

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0040] In order to achieve the purpose of releasing or absorbing active power to the grid, it is no longer possible to maintain the device output voltage V c with grid voltage V s phase coincidence, and to make V c slightly lags or leads V s . Φ is less than 90°, then P c Greater than zero, the device absorbs active power from the grid and the DC bus voltage rises. Φ is greater than 90°, P c If it is less than zero, the device sends active power to the grid, and the DC bus voltage drops.

[0041] As mentioned above, by adjusting Φ c The overall DC bus voltage can be kept stable. But it is not enough to keep the overall DC bus voltage stable, the DC bus voltage of each bridge must also be kept stable, Figure 4 The SVG circuit shown is required to work properly. The active power absorbed by each bridge from the grid is

[0042] P i =V i I c cosΦ

[0043] where V i Output voltage for each bridge. Such as Figure 5 As shown, each H-bridge output voltage waveform ...

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Abstract

The control device for static reactive generator includes input converter, memory, collator, phase angle regulator, reference sine voltage generator, pulse width regulator capable of making anisobaric bridge direct current bus voltage retain stable, crossing point voltage calculator, crossing point voltage arbiter, pulse edge selector capable of making all isobaric bridge direct current bus voltage retain equalization and bridge driving pulse generator. By adopting this control device all series direct current bus voltages still can basically retain stable when the output voltage and current are quickly changed so as to ensure that the output voltage waveform does not distort and the controlled static reactive generator can normally work.

Description

technical field [0001] The invention belongs to a control device of a static var generator for realizing reactive power compensation in a power system, and is particularly suitable for a control device of an H-bridge type SVG device directly coupled to a power grid with unequal DC bus voltages connected in series. Background technique [0002] The principle of SVG device is as follows figure 1 as shown, figure 2 For the case where the device outputs leading reactive current, image 3 For the case of output lagging reactive current. The basic equation of the device is: [0003] V s =V c +jI c x s [0004] where V s is the grid voltage, V c is the output voltage of the SVG device, I c Output current for SVG device, X s is the impedance of the input inductor. It can be seen from the above formula that as long as the SVG output voltage V c with net voltage V s In the same phase, the SVG output current is the same as V s The phase difference is 90°, that is, I c...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02M7/00
CPCY02E40/30
Inventor 王颖曜
Owner ZHUZHOU TIMES ELECTRONICS TECH CO LTD