DSVG double-loop control method

A control method and current inner loop technology, applied in the AC network to reduce harmonics/ripple, reactive power compensation, harmonic reduction devices, etc., can solve the problem that the open-loop control is difficult to obtain the output voltage, and achieve fast tracking , Improve the current and voltage waveforms, and ensure the effect of stable output

Inactive Publication Date: 2017-03-22
国船电气(武汉)有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary open-loop control can output a relatively good voltage waveform under static conditions, but under asymmetrical load conditions, especially nonlinear loads, and load dynamic changes, open-loop control is difficult to obtain a good output voltage

Method used

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  • DSVG double-loop control method
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  • DSVG double-loop control method

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] 1. A control method for DSVG, characterized in that: it comprises regulating the DC bus voltage as an outer voltage loop, using the output of the regulator and the load current as an inner current loop, and passing through the outer voltage loop and the inner loop of the current. The drive signal is generated by the regulator after comparing with the current feedback; the specific steps are as follows,

[0032] Step 1, the input signals of the voltage outer loop and the current inner loop are obtained by sampling, the input signals of the voltage outer loop include UnetA, UnetB, and UnetC, and the input signals of the regulator part of the current inner loop input signal Including IsvgA, IsvgB and IsvgC, the input signal of the load current part in the input signal of the current inner loop includes IloadA, IloadB and IloadC;

[0033] Step 2: Input th...

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Abstract

A DSVG double-loop control method provided by the invention comprises: a direct current bus voltage regulation is taken as a voltage outer ring, and a regulator output and the load current are taken as a current inner ring, and after the given voltage outer ring and current inner ring is compared to the current feedback, driving signals are generated through the regulator. The DSVG double-loop control method can provide energy and rapidly track the load current, ensure the stable output of the direct current bus voltage and improve the current and voltage waveform.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation equipment control, in particular to a DSVG control method. Background technique [0002] The hardware platform of DSVG low-voltage active reactive power compensation uses a three-phase four-leg inverter, that is, a fourth bridge arm is added to the conventional three-phase inverter, and a neutral current path is added for unbalanced loads. , adding the fourth bridge arm is equivalent to adding a degree of freedom, so that the three-phase four-leg inverter power supply can generate three independent voltages, so that it has the ability to maintain the three-phase output voltage under unbalanced and non-linear loads of symmetry. [0003] In the three-phase four-leg inverter, whether it is a symmetrical load or an asymmetrical load, the output of three-phase symmetrical sine wave voltage is the key. Ordinary open-loop control can output a relatively good voltage waveform under s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/18Y02E40/30Y02E40/40
Inventor 周莉钱飞李知杰王珏宋泽宇黄伟何文斌
Owner 国船电气(武汉)有限公司
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