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Computing method for connecting inductors of static var generator

A technology of static reactive power and connected inductance, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, which can solve problems such as no theoretical calculation basis

Inactive Publication Date: 2014-10-01
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the parameter selection of SVG connection inductance is from the perspective of harmonics and economy, and the per unit value of inductance is 0.2-0.5, and there is no actual theoretical calculation basis.

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  • Computing method for connecting inductors of static var generator
  • Computing method for connecting inductors of static var generator
  • Computing method for connecting inductors of static var generator

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Embodiment Construction

[0019] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] The invention provides a method for calculating the connection inductance of a static var generator, combining image 3 Shown is the single-phase equivalent diagram of the SVG access system, where U s is the system bus voltage, U r is the SVG output fundamental wave voltage, L is the connection inductance, Q is the SVG output power, assuming U s and U r The phase difference between them is δ. For SVG, δ generally does not exceed 3°, that is, cosδ≈1. The analysis and calculation are as follows:

[0021] (1) SVG output fundamental wave voltage U r :

[0022] U r = m U dc 2 2

[0023] Among them, m is the modulation ratio, U dc is the DC side voltage of the st...

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Abstract

The invention discloses a computing method for connecting inductors of a static var generator. The static var generator comprises three connecting inductors, a direct current capacitor and six valve units. The six valve units are connected in series in a pairwise mode to form three series branches, and then the series branches are connected in parallel. One ends of the three connecting inductors are all connected with one phase of a system busbar, and the other ends of the three connecting inductors are connected with connecting points of every two valve units in the three series branches respectively. The direct current capacitor and the three series branches are connected in parallel. The computing method includes the following steps that the no-load modulation ratio of the static var generator is determined, the modulation ratio of the static var generator in the maximum reactive outputting process is determined, and the inductance of the connecting inductors which can meet the reactive outputting requirement is calculated. By the adoption of the method, according to the defect that the parameter selection values of the connecting inductors of a current high-voltage high-capacity static var generator depend on experience, a practical theoretical calculation basis is provided, and high design guiding significance can be achieved.

Description

technical field [0001] The invention belongs to the field of high-power electric electronics, in particular to a method for calculating the connection inductance of a static var generator in the field of high-voltage and large-capacity static var generators. Background technique [0002] Static Var Generator (SVG, Static Var Generator) technology is a development direction of dynamic var compensation technology. The advantages of small impact have become a research hotspot of relevant institutions at home and abroad. [0003] figure 1 It is a schematic diagram of a high-voltage and large-capacity static var generator. The static var generator includes three connected inductors, DC capacitors and six valve units. Each valve unit is composed of a certain number of power devices directly connected in series. figure 2 As shown, after the six valve units are connected in series in pairs, the three series branches formed are then connected in parallel; one end of the three conn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 黄华陈赤汉张磊刘磊李成博
Owner NR ELECTRIC CO LTD
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