A current limiting device and current limiting method of an active power filter

A power filter and current limiting device technology, which is applied in active power filtering, circuit devices, emergency protection circuit devices, etc., can solve problems such as excessive peak current, damaged IGBT, damaged IGBT, etc., and achieves accurate peak current limiting , Guarantee stable operation and avoid overcurrent damage
CN109066630BInactive Publication Date: 2020-09-04上海沫安能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
上海沫安能源科技有限公司
Publication Date
2020-09-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a current limiting device of an active power filter, comprising a power frequency cycle module, a switching cycle module and a hardware circuit module. The power frequency cyclemodule is used for calculating the current limiting coefficient of the reference current effective value and realizing the current limiting control of the harmonic reference current effective value.The switching cycle module is used for calculating the peak current limiting coefficient of the reference current, realizing the current limiting control of the peak current of the harmonic current, and simultaneously calculating the real-time reference current after twice current limiting; The hardware circuit module corrects the peak current limiting coefficient. The invention also provides a current limiting method of a current limiting device of an active power filter. The invention can carry out more accurate effective value and peak current limiting on APF under each working condition, At the same time, the peak current of IGBT is detected by hardware circuit, and the working state of IGBT is adjusted in real time to avoid overcurrent damage or frequent overcurrent protection of IGBT, and the current stress of IGBT is controlled, which ensures the stable operation of APF under all operating conditions.
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Description

technical field

[0001] The present invention relates to the technical field of active power filters, in particular to a current limiting device and a current limiting method for an active power filter. Background technique

[0002] Active Power Filter (APF), as a current harmonic generator based on a fully controlled rectifier, has a much more complex control system than a current fundamental wave generator based on a fully controlled rectifier, especially for its current limiting technology, for fundamental wave systems (such as photovoltaic inverters, SVG, etc.), the current peak value and effective value are in a fixed proportional relationship, while for APF, since the phase and amplitude proportional relationship of each harmonic varies with the load in real time, its The relationship between the current peak value and the effective value is not fixed, which makes the current limiting technology more complicated.

[0003] The invention patent with the application numbe...

Claims

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