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Active power filter based on auxiliary resonant soft switching technology and soft start method

A power filter and soft switching technology, applied in active power filtering, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve the problems of deterioration of commutation conditions of switching elements, changes of commutation conditions, etc. , to achieve the effect of easy-to-understand software programming, high voltage utilization, and improved conversion efficiency

Inactive Publication Date: 2012-01-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The commutation components of the inverter unit face the danger of excessively high dv / dt and di / dt. Even if some passive auxiliary commutation measures are adopted, when the load current or the DC side capacitor voltage changes, it is easy to cause changes in the commutation conditions , which further deteriorates the commutation condition of the switching element

Method used

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  • Active power filter based on auxiliary resonant soft switching technology and soft start method
  • Active power filter based on auxiliary resonant soft switching technology and soft start method
  • Active power filter based on auxiliary resonant soft switching technology and soft start method

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Embodiment

[0026] Embodiment: a kind of active power filter based on auxiliary resonant soft switching technology (see figure 1 ), including a power grid containing loads and harmonic sources, is characterized in that it includes pre-processing circuits, DSP preprocessing and data calculation modules, single-chip main controllers, keyboards and display LCDs, peripheral communication interfaces, over-limit alarm devices and post-stage processing circuit; wherein, the input end of the pre-processing circuit is connected to a position close to the harmonic source of the power grid, and is bidirectionally connected with the DSP preprocessing and data calculation module; the single-chip main controller is connected with the DSP preprocessing and data calculation module , the keyboard, the display LCD, the peripheral communication interface, and the post-processing circuit are bidirectionally connected, and its output end is connected to the input end of the over-limit alarm device; the output ...

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Abstract

The invention discloses an active power filter based on auxiliary resonant soft switching technology, which comprises a power grid containing a load and a harmonic source. The active power filter is characterized by comprising a forestage processing circuit, a DSP (Digital Signal Processor) pre-processing and data calculating module, a singlechip main controller, a keyboard and an LCD (Liquid Crystal Display), an external communication interface, an off-limit alarm device and a post-stage processing circuit. The active power filter has the advantages that: firstly, a hardware device has a small size, a light weight and an easy-to-understand software program; secondly, the soft switching technology is adopted to improve the conversion efficiency of the inverter and avoid over-high dv / dt and di / dt risks; thirdly, the utilization rate of direct current side voltage of the inverter is high; and fourthly, the execution speed is high and the real-time control capability of the controller is improved.

Description

(1) Technical field: [0001] The invention relates to the field of power system harmonic control, in particular to an active power filter and a soft start method based on auxiliary resonance soft switching technology. (two) background technology: [0002] With the rapid development of our country's social economy, the large number of non-linear equipment is used, and the harmonic problems brought about by it are becoming more and more serious. In addition, the traditional transformers and core reactors that are widely used will also generate harmonics, and the harmonic pollution is becoming more and more serious. More and more threats to the safety, stability and economic operation of the power system have brought great impact on the surrounding electrical environment. Due to the technical limitations of traditional passive filters and the continuous advancement of active power filter technology, the role of active power filters in harmonic control has become increasingly sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 马幼捷杨亚光周雪松周金程崔立强
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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