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A New Method of Voltage Feedforward Control of Static Var Generator and Static Var Generator

A static var and voltage feedforward technology, applied in the field of static var generator voltage feedforward control and static var generator, can solve the problems of accelerating the response speed of asymmetrical faults in the power grid, so as to ensure non-stop operation and speed up Response speed, the effect of three-phase direct pressure balance and stability

Active Publication Date: 2020-10-09
WUHAN KELIYUAN ELECTRIC CO LTD
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Problems solved by technology

[0006] The main purpose of the present invention is to provide a new method of static var generator voltage feed-forward control, aiming at solving the problem of the control of star-connected static var generator three-phase direct voltage balance when a single-phase or two-phase drop occurs in the grid voltage and technical issues to speed up response to asymmetrical faults in the power grid

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  • A New Method of Voltage Feedforward Control of Static Var Generator and Static Var Generator
  • A New Method of Voltage Feedforward Control of Static Var Generator and Static Var Generator
  • A New Method of Voltage Feedforward Control of Static Var Generator and Static Var Generator

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Embodiment Construction

[0048] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] refer to figure 1 The first embodiment of the new method for voltage feedforward control of static var generators in the present invention provides a new method for voltage feedforward control of static var generators. In this embodiment, the static var generator is a star chain static var generator. The star chain static var generator is based on the multi-level structure of the H-bridge power unit module.

[0050] refer to figure 2 , the new static var generator voltage feed-forward control method includes:

[0051] S100. The static var generator acquires the current negative sequence voltage when the power grid is unbalanced.

[0052] The static var generator is to connect the self-commutated bridge circuit to the power grid through a reactor or directly in parallel to adjust the phase and amplitude of ...

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Abstract

The invention discloses a novel SVG (static var generator) voltage feedforward control method and an SVG. The novel SVG voltage feedforward control method comprises the steps as follows: the SVG acquires current negative sequence voltage when a power grid is unbalanced; the current zero sequence voltage of the SVG is determined according to the current negative sequence voltage and a preset corresponding relation which is between the negative sequence voltage and zero sequence voltage, so that SVG voltage feedforward control is realized; the current zero sequence voltage is superposed to three-phase unbalanced voltage for feedforward control of three-phase voltage reconstruction, so that SVG voltage feedforward control is realized. When the power grid single-phase, two-phase or three-phasevoltage drop asymmetry, a star chain type SVG has stable voltage among three phases and has continuous reactive current output capacity, and meanwhile, the response speed of the asymmetric fault of the power grid is increased.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a new method for voltage feedforward control of a static var generator and a static var generator. Background technique [0002] When the power grid is unbalanced and falls, the negative sequence voltage on the grid side will cause negative sequence current on the SVG output side, and the positive sequence reactive current, negative sequence current and grid voltage output by the chained SVG (Static Var Generator) will interact with each other. The effect makes the active power absorbed among the three phases unbalanced, resulting in the unequal three-phase direct voltage and instability of the three-phase direct voltage. [0003] At present, when the power grid is unbalanced and fails, the control strategy that can maintain the stability of the chained SVG phase-to-phase direct voltage includes the control strategy of injecting negative sequence current. [0004] The control st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/16
CPCH02J3/16H02J3/26Y02E40/10Y02E40/30Y02E40/50
Inventor 瞿李锋孙建军习楠李尚盛查晓明
Owner WUHAN KELIYUAN ELECTRIC CO LTD
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