Inverter output filter with a set of series resonance subcircuits

An output filter and series resonance technology, which is applied in the field of PWM inverter output filter, can solve the problems of inverter output current waveform distortion and the filter cannot provide inverter carrier frequency at the same time, so as to achieve the reduction of inductance parameters, Effect of reducing filter cost

Inactive Publication Date: 2013-11-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the filter cannot simultaneously provide the carrier frequency required by the inverter and the double-frequency dual current bypass channel, which distorts the inverter output current waveform

Method used

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  • Inverter output filter with a set of series resonance subcircuits
  • Inverter output filter with a set of series resonance subcircuits
  • Inverter output filter with a set of series resonance subcircuits

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Embodiment Construction

[0017] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0018] figure 1 It is the schematic diagram of the filter circuit of the first embodiment proposed by the present invention. It can be seen from the figure that the inverter uses PWM (Pulse Width Modulation) to generate a voltage with a specific frequency and amplitude, and through the inductor L 1 , inductance L 2 and capacitance C d The formed LCL filter is connected to the power grid. In addition, the filter also includes a group of series resonant branches composed of N parallel connected series resonant branches. Inductance L f1 with capacitance C f1 The first series resonant branch in the series resonant branch group is formed in series, and its series resonant frequency is the same as the switching frequency of the inverter, thus providing a bypass channel for the switching frequency harmonics of the inverter; the inductance ...

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Abstract

The invention discloses an inverter output filter with a set of series resonance subcircuits. The inverter output filter comprises a traditional LCL output filter body and further comprises a series resonance subcircuit set formed by the N series resonance subcircuits mutually connected in parallel. The N series resonance subcircuits mutually connected in parallel are all connected with a capacitor in the LCL output filter body in parallel. An inverter is connected with a power grid through the inverter output filter. According to the inverter output filter with a set of series resonance subcircuits, the N series resonance subcircuits can respectively filter first N-time switching frequency harmonic components in the output current of the inverter, and therefore the total cost and the total size of the inverter output filter can be reduced.

Description

Technical field: [0001] The invention relates to a PWM inverter output filter, in particular to an inverter output filter with a group of series resonance branches. technical background: [0002] The traditional inverter output filter mainly adopts LCL type filter, which is used to filter the PWM (pulse width modulation) switching frequency and its integer multiple frequency harmonics generated by the filter, so as to meet the harmonics of the inverter output current by the grid standard. wave request. However, due to the limitation of switching devices and losses, the switching frequency cannot be made very high. In order to effectively filter out the inverter output current harmonics with the switching frequency as the main component, an LCL filter with a lower cut-off frequency must be used. As a result, the cost of the filter is higher. [0003] Chinese invention patent (CN102468651A) discloses a "specific frequency current bypass filter", which is based on the traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
Inventor 张兴李飞朱虹施洋洋李浩源刘淳刘芳余畅舟
Owner HEFEI UNIV OF TECH
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