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 converting DC power input to DC power output, AC power input converting to DC power output, and output power conversion devices, etc., can solve the problem of low reliability of power decoupling system, etc. question

Active Publication Date: 2014-10-15
EAST GRP CO LTD
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  • Summary
  • 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

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 particularly discloses a single-phase grid-connected inverter with an active power decoupling function, and a power decoupling control method of the single-phase grid-connected inverter. The inverter comprises a buck-boost converter, a single-phase two-bridge-arm inversion circuit, an alternating-current low-pass output filter circuit and an active power decoupling circuit, wherein the active power decoupling circuit is embedded into the single-phase two-bridge-arm inversion circuit to form a three-bridge-arm inversion circuit; a direct-current input source of the inverter is connected with an input end of the buck-boost converter; an input filter capacitor is connected in parallel between the direct-current input source of the inverter and the input end of the buck-boost converter; an output end of the buck-boost converter is connected with an input end of the three-bridge-arm inversion circuit; an output end of the three-bridge-arm inversion circuit is connected with an input end of the alternating-current low-pass output filter circuit; and power decoupling control is performed by a pulse width energy modulation method. The inverter can use a non-electrolytic capacitor as a decoupling capacitor and avoids an electrolytic capacitor, so that the fault interval time of the inverter is prolonged, and the reliability of a system is improved.

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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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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