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A grid-connected pwm converter anti-grid disturbance method

A power grid disturbance and converter technology, applied in the direction of single grid parallel feeding arrangement, etc., can solve the problem of poor anti-power grid disturbance ability, and achieve the effect of improving the anti-disturbance level, improving the ride-through ability, and reducing the failure rate of shutdown.

Active Publication Date: 2017-06-06
SHANGHAI GIE EM
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AI Technical Summary

Problems solved by technology

[0005] In view of the existing grid-connected PWM converter's poor ability to resist grid disturbances, the purpose of the present invention is to provide a system that can effectively reduce the impact of grid voltage transient disturbances on the operation of the grid-connected PWM converter and improve the converter's anti-disturbance level. Anti-grid Disturbance Method of Grid-connected PWM Converter

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  • A grid-connected pwm converter anti-grid disturbance method
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  • A grid-connected pwm converter anti-grid disturbance method

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Embodiment Construction

[0041] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0042] The grid-connected PWM converter anti-grid disturbance method provided by the present invention operates for a short time through the current hardware clamp under the grid disturbance detection, so as to pass through the grid voltage waveform disturbance interval, reduce the failure shutdown rate caused by grid disturbance, and improve Converter immunity level.

[0043] Based on above-mentioned principle, concrete scheme of the present invention is formed by the following steps:

[0044] (1) Detect the grid voltage and output current, and judge in real time whether there is a transient disturbance of the voltage waveform;

[0045] (2) If an overcurrent is detected and a transient disturbance of the voltage waveform is detected at the sam...

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Abstract

The invention discloses a grid-connected PWM converter anti-power-grid-disturbance method which is to reduce the influence of power grid voltage waveform distortion disturbance on the operation of a grid-connected PWM converter. The method comprises judging whether a power grid has waveform transient disturbance in real time by detecting the voltage of the power grid; if power grid disturbance is detected and meanwhile, the grid-connected PWM converter has instantaneous overcurrent, allowing the grid-connected PWM converter to work temporarily under the state of overcurrent in a current hardware clamping manner to prevent fault shutdown to the largest degree; if duration time of the overcurrent state exceeds a set value, causing fault shutdown, but after a fixed time delay, and fault state is restored automatically, putting the converter into operation again; and if no power grid disturbance is detected and meanwhile overcurrent occurs, triggering overcurrent protection, and carrying out direct fault shutdown, fault being not restored automatically. The method can greatly improve anti-power-grid-disturbance capability of the grid-connected PWM converter, and the anti-interference level of the converter is improved.

Description

technical field [0001] The invention relates to a grid-connected PWM converter, in particular to a grid-connected PWM converter anti-grid disturbance technology. Background technique [0002] The transient disturbance of the power grid is mainly generated when the high-power diode rectifier or thyristor converter device that exists near the common point of the power grid is started and operated. During the phase commutation phase, the grid voltage will cause commutation gaps or waveform distortions. The gap depth and distortion amplitude Depends on the short-circuit impedance ratio of the grid power supply and the commutation circuit. In the national standard GB / T3859.1-2013, it gives the immunity level of the voltage waveform under different immunity level requirements, as attached figure 2 shown; at the same time, in the national standard GB / T3859.1-2013, it gives the AC voltage waveform when interference exists, as attached image 3 shown. [0003] see figure 2 , the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 刘春龙黄洪剑石岩峰
Owner SHANGHAI GIE EM
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