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A new control method suitable for cascaded h-bridge static var compensator

A static var compensation and static var technology, applied in reactive power adjustment/elimination/compensation, harmonic reduction device, AC network to reduce harmonics/ripple, etc., can solve the problem of increasing SVG cost and volume, reducing SVG cost and volume, reducing H-bridge module DC link capacitance and other issues, to achieve the effect of reducing equipment voltage stress and switching loss, reducing equipment cost and volume, and reducing the peak value of capacitor voltage

Active Publication Date: 2018-06-05
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of large-capacity capacitors will increase the cost and volume of SVG. Therefore, the study of new control methods for SVG systems can effectively reduce the capacitance of the H-bridge module DC link and reduce the cost and volume of SVG.

Method used

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  • A new control method suitable for cascaded h-bridge static var compensator
  • A new control method suitable for cascaded h-bridge static var compensator
  • A new control method suitable for cascaded h-bridge static var compensator

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Embodiment Construction

[0085] The present invention is described in detail below in conjunction with accompanying drawing:

[0086] Based on the SVG control method of the traditional chain structure, the output capacitance of the H-bridge capacitor can be expressed as:

[0087]

[0088] Among them, I g is the amplitude of the reactive phase current output by the SVG, M is the modulation ratio of the compensator, w is the angular frequency of the grid voltage, and θ is the initial phase angle of the grid phase voltage. Then the SVG DC link voltage contains a double frequency component. Taking the SVG inductive reactive power as an example, the H-bridge DC link capacitor voltage of the SVG can be expressed as:

[0089]

[0090] where V ave is the DC component of the capacitor voltage, MI g x c / 4 is the magnitude of the double frequency fluctuation component; and X C is the magnitude of the DC link capacitive reactance. The traditional SVG control method is to control the average value of ...

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Abstract

The invention discloses a novel control method suitable for a cascaded H bridge static var compensator. The method comprises the following steps that the mean value of a DC chain voltage is controlled to change dynamically with reactive current amplitude, a third harmonic voltage or third harmonic current output by the cascaded H bridge static var compensator is controlled to control a capacitor voltage, and the peak value of the capacitor voltage is optimized. According to the control method, it is ensured that the voltage of a power switch device is not out of the limit under the condition that the capacitor voltage of the DC chain fluctuates widely, an SVG is prevented from over-modulation, and the DC capacitance of the SVG is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a novel control method suitable for cascaded H-bridge static var compensators. Background technique [0002] The reactive power compensator can effectively solve the common voltage collapse problem in the power system and improve the voltage quality. With the development of power electronic devices, reactive power compensators have developed from traditional compensation equipment such as capacitor banks, reactor banks, and condensers to static var compensation based on insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT). (Static Var Generator, SVG). The SVG with a chain structure can increase the output voltage of the SVG device by cascading multiple H-bridge modules, so it is widely used in medium-high voltage and large-capacity reactive power compensation applications. [0003] The traditional chained SVG capacitor voltage control method c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/1842Y02E40/10Y02E40/40
Inventor 高峰葛雪峰王盼瑞
Owner SHANDONG UNIV
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