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Single-phase grid-connected inverter with active power decoupling function and power decoupling method

A power decoupling and inverter technology, which is applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, output power conversion device, etc., can solve the problem of low reliability of the power decoupling system problem, to achieve the effect of reducing the capacitance of the decoupling capacitor, reducing requirements and improving reliability

Active Publication Date: 2016-09-07
EAST GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The problem to be solved by the present invention is the defect of low reliability of the existing inverter power decoupling system. It provides a single-phase grid-connected inverter with active power decoupling function and a power decoupling control method, which can avoid Use electrolytic capacitors to extend the time between faults of the inverter and improve system reliability

Method used

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  • Single-phase grid-connected inverter with active power decoupling function and power decoupling method
  • Single-phase grid-connected inverter with active power decoupling function and power decoupling method
  • Single-phase grid-connected inverter with active power decoupling function and power decoupling method

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Embodiment

[0035] Please refer to figure 1 , the single-phase grid-connected inverter with active power decoupling function described in the present invention includes a buck-boost converter 1, a single-phase two-leg inverter circuit 2, an AC low-pass output filter circuit 3 and an active The power decoupling circuit 4, the active power decoupling circuit 4 is embedded in the single-phase two-bridge inverter circuit 2 to form the three-bridge inverter circuit 5; the DC input source 6 of the inverter and the input of the buck-boost converter 1 terminal connection, an input filter capacitor 8 is connected in parallel therebetween, the output terminal of the buck-boost converter 1 is connected to the input terminal of the three-arm inverter circuit 5, and the output end of the three-arm inverter circuit 5 is connected to the AC low-pass output filter circuit 3 to form a single-phase grid-connected inverter circuit.

[0036] Among them, the active power decoupling circuit 4 includes an uppe...

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Abstract

The invention relates to the technical field of miniature single-phase photovoltaic grid-connected inverters, and specifically discloses a single-phase grid-connected inverter with active power decoupling function and a power decoupling control method thereof. converter, a single-phase two-leg inverter circuit, an AC low-pass output filter circuit, and an active power decoupling circuit, the active power decoupling circuit is embedded in the single-phase two-leg inverter circuit to form a three-leg inverter circuit; the DC input source of the inverter is connected to the input terminal of the buck-boost converter, an input filter capacitor is connected in parallel therebetween, and the output terminal of the buck-boost converter is connected to the three-leg inverter circuit The input end of the three-bridge arm inverter circuit is connected to the input end of the AC low-pass output filter circuit; the power decoupling control is performed by using a pulse width energy modulation method. The present invention can use non-electrolytic capacitors as decoupling capacitors, avoiding the use of electrolytic capacitors, thereby prolonging the fault interval time of the inverter and improving the reliability of the system.

Description

technical field [0001] The invention relates to the technical field of miniature single-phase photovoltaic grid-connected inverters, in particular to a single-phase grid-connected inverter with an active power decoupling function and a power decoupling control method thereof. Background technique [0002] Residential power supply is mostly single-phase power, so the single-phase grid-connected inverter topology is widely used in household distributed power generation systems. However, while the single-phase grid-connected inverter meets the grid-connected requirements, it will cause power pulsation at twice the power frequency on the input side of the inverter. The low-frequency power ripple on the input side will seriously affect the energy utilization rate of the DC input source and increase the total harmonic distortion rate of the output grid-connected current. [0003] In the prior art, the method of passive power decoupling is usually used to solve this problem, that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M3/155H02M1/12H02J3/38
Inventor 廖锦涛苏建徽张榴晨徐海波
Owner EAST GRP CO LTD
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