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Single-stage boosting three-phase flyback inverter for solar energy grid-connected power generation

A flyback inverter and grid-connected power generation technology, which is applied in the field of solar power generation, can solve the problems of no electrical isolation, direct phenomenon, and inability to boost voltage, and achieve the effect of quality assurance

Inactive Publication Date: 2014-02-26
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a single-stage boostable three-phase inverter main circuit topology for solar grid-connected power generation, and it solves the problem that the traditional three-phase full-bridge inverter cannot boost the voltage and will appear through phenomenon , no electrical isolation and other issues

Method used

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  • Single-stage boosting three-phase flyback inverter for solar energy grid-connected power generation
  • Single-stage boosting three-phase flyback inverter for solar energy grid-connected power generation
  • Single-stage boosting three-phase flyback inverter for solar energy grid-connected power generation

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Embodiment Construction

[0013] In order to make the implementation and technical means of the present invention easier to understand, the following will be described in detail in combination with specific figures.

[0014] Such as image 3 Shown are the current and voltage waveforms of various parts in the inverter during operation. From the voltage waveform on the grid side, we can rectify the three-phase voltage waveform with the same phase and frequency. For example, the phase A voltage on the grid side is Then take the rectified signal as |M sin ωt|, Comparing it with a fixed sawtooth wave modulation signal, the switching pulse width of the DC side can be obtained according to the comparison result, such as image 3 (a), (b), (c), where E m is the grid voltage amplitude, ω is the angular frequency of the grid voltage, and M is the modulation coefficient of the PWM signal (0<M<1). For the switching tube on the AC side, when the corresponding grid-side phase voltage potential is greater than ...

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Abstract

The invention provides a circuit structure of a single-stage boosting three-phase flyback inverter applied to solar energy grid-connected power generation. The inverter comprises a high-frequency flyback converter, a primary switching element, six secondary switching elements, six diodes and a filter part, and therefore three-phase currents meeting grid connection requirements are provided. A single-stage structure is adopted in the circuit of the inverter, direct-current electricity is directly transmitted to a power grid through a DC / AC converter, primary DC / DC conversion is reduced, and therefore efficiency of the converter is improved. The flyback inverter operates under a current intermittent mode, a direct-current side switching original element can conveniently control and output three-phase voltage through a PWM mode, and meanwhile, under the current intermittent mode, an alternating-current switching original element can also achieve a zero-current soft switching target.

Description

technical field [0001] The invention relates to the field of solar power generation, in particular to a single-stage boostable three-phase inverter for grid-connected solar power generation. Background technique [0002] As an inexhaustible new energy source, the development and utilization of solar energy has attracted widespread attention from all over the world, and is gaining huge social and economic benefits. In the photovoltaic power generation system, the grid-connected inverter is the core part. With the continuous deepening of research on solar power generation, the development of grid-connected inverters is also changing with each passing day, and has begun to gradually change from the initial centralized inverter From single-branch and multi-branch inverters to AC module inverters. The AC module inverter has the advantages of independent maximum power point tracking for each module, plug-and-play, convenient expansion, and easy mass production to reduce costs. Th...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/537
CPCY02E10/563Y02B70/1491Y02B70/10Y02E10/56
Inventor 谭光慧谭敏刚戴劲松
Owner SOUTHEAST UNIV
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