Single-phase photovoltaic power generation converter topology

A photovoltaic power generation, single-phase inverter technology, applied in the direction of photovoltaic power generation, AC power input conversion to AC power output, electrical components, etc., can solve the problem of low power density of photovoltaic conversion systems

Inactive Publication Date: 2016-10-12
HUBEI UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the AC side is connected to a power frequency transformer, the power density of the photovoltaic converter system will be low; if the DC side voltage is increased, a DC boost converter is generally added to the DC side or a method of connecting enough photovoltaic modules in series

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  • Single-phase photovoltaic power generation converter topology

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Embodiment Construction

[0011] The specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0012] The single-phase photovoltaic power generation converter topology proposed by the present invention is shown in FIG. 1. The single-phase photovoltaic power conversion topology is composed of a single-phase inverter and an AC-AC converter, and the output of the single-phase inverter is connected to the input of the AC-AC converter.

[0013] The single-phase inverter includes a first capacitor branch, a first bridge arm and a second bridge arm connected in parallel. The first capacitor branch is composed of a first capacitor Cin, and the anode of the first capacitor Cin is connected to P 1 Point, the negative pole of the first capacitor Cin is connected to P 2 point. The first bridge arm is connected in series by the forward first switch S 1 , The second switch tube S 2 The second bridge arm consists of the third switch tube S connected in series in the f...

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Abstract

The invention discloses a single-phase photovoltaic power generation converter topology, belongs to the technical field of power electronic conversion, and mainly aims at solving the problems that output voltage of a household low-power photovoltaic power generation system cannot meet the grid connection requirements and the requirements of a local load on voltage in general. The single-phase photovoltaic power generation converter topology is mainly characterized by comprising a single-phase inverter and an AC-AC converter, wherein an output end of the single-phase inverter is connected with an input end of the AC-AC converter. DC power generated by photovoltaic modules is converted into AC power by the single-phase inverter; and the obtained AC power is boosted by the AC-AC converter and then is connected to a power grid or used by the local load. The single-phase photovoltaic power generation converter topology has the uniqueness that AC boosting is carried out after inversion, and the single-phase photovoltaic power generation converter topology is suitable for the application of relatively low DC voltage (relatively few photovoltaic modules are connected in series) generated by the photovoltaic modules.

Description

Technical field [0001] The invention belongs to the technical field of power electronic conversion, and specifically relates to a single-phase photovoltaic power generation conversion topology. Background technique [0002] The power converter topology is an electric energy processing circuit that converts one electric power into another electric power. In photovoltaic power generation systems, it is generally required to convert the DC power generated by photovoltaic components into AC power. This function needs to be realized by a certain power conversion topology. The power conversion topology is generally a DC-AC converter, DC-DC Converter or power circuit composed of DC-DC converter and DC-AC converter. [0003] For household low-power photovoltaic power generation systems, there are few photovoltaic components and low DC voltage generated. If the low-voltage DC power is directly converted into AC power, the AC voltage generally does not meet the grid-connected requirements a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M5/293
CPCH02M5/293H02M7/48H02M1/007Y02B10/10Y02E10/56
Inventor 陈红兵闵晶妍
Owner HUBEI UNIV OF ARTS & SCI
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