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Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof

A technology of power decoupling and flyback converter, which is applied in the output power conversion device, the conversion of DC power input to DC power output, and the conversion of irreversible DC power input to AC power output, etc., can solve the problem of reducing system reliability. , short life of electrolytic capacitors, etc., to ensure the service life, improve reliability, and avoid the effects of electrolytic capacitors

Active Publication Date: 2012-06-27
ALTENERGY POWER SYST
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AI Technical Summary

Problems solved by technology

However, the life of electrolytic capacitors is very short, much lower than the life of solar photovoltaic arrays
Therefore, the electrolytic capacitor has become a key factor restricting the life of the inverter and also reduces the reliability of the entire system

Method used

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  • Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof
  • Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof
  • Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] refer to figure 1 , a flyback miniature photovoltaic grid-connected inverter 10 with a power decoupling circuit of the present invention, which includes a flyback converter 101 and a power frequency polarity conversion circuit 103; the output voltage of the solar photovoltaic array 20 An input filter capacitor connected in parallel to the output voltage of the solar photovoltaic array is connected to the input terminal of the flyback converter 101; the output port of the flyback converter 101 is connected to the output filter capacitor and the power frequency polarity conversion circuit 103; The flyback converter 101 is provided with a power decoupling circuit 102 , the input end of the power decoupling circuit 102 is connected to the solar photovoltaic array 20 and the input filter capacitor, and the output end is connected to the primary side of the flyback ...

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Abstract

A purpose of the present invention is disclosing a flyback type miniature photovoltaic grid connected inverter with a power decoupling circuit and a control method thereof. The inverter comprises a flyback converter and a power frequency polarity conversion circuit. The flyback converter is provided with a power decoupling circuit, a decoupling capacitance voltage grade is higher than output voltage of a solar energy photovoltaic array, decoupling capacitance voltage is allowed to fluctuate in a large range, thus decoupling capacitance capacity is decreased, power decoupling can be realized by only using a non-electrolytic capacitor, using an electrolytic capacitor is avoided, a service life of the miniature photovoltaic grid connected inverter is prolonged, and reliability is raised. Through the control method, not only is decoupling of miniature photovoltaic grid connected inverter output power and solar energy photovoltaic array output power realized, but also direct current voltage and current waveform outputted by the solar energy photovoltaic array can maintain smooth, a service life of the solar energy photovoltaic array is guaranteed, and realization of maximum power point tracking (MPPT) is facilitated.

Description

technical field [0001] The invention relates to a flyback miniature photovoltaic grid-connected inverter with a power decoupling circuit and a control method thereof. Background technique [0002] Micro photovoltaic grid-connected inverters have attracted more and more attention because of their advantages such as high energy utilization rate, good system scalability, and easy installation. In particular, when combining a microinverter with a single solar photovoltaic array to form an AC module, the inverter needs to have a lifespan that matches that of the photovoltaic array. [0003] In the miniature photovoltaic grid-connected inverter, the solar photovoltaic array generates smooth DC power due to the effect of MPPT, and the power measured by the grid-connected grid is the power pulsation of twice the grid frequency. Usually, large-capacity electrolytic capacitors are connected in parallel at both ends of the solar photovoltaic array to solve the problem of instantaneous...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/48H02M3/335
CPCY02E10/58Y02E10/563Y02E10/56
Inventor 陈敏李朵张哲莫琼钱照明罗宇浩凌志敏
Owner ALTENERGY POWER SYST
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