Photovoltaic grid-connected inverter

An inverter and photovoltaic technology, applied in the field of solar photovoltaic power generation, can solve the problems of large output voltage harmonics, large switching losses, grid pollution, etc., and achieve the effect of reducing output voltage harmonics and reducing switching losses

Inactive Publication Date: 2011-08-17
北京国电四维清洁能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) The switching frequency of the switching component is high, the switching loss is large, and the heat generation is serious;
[0005] (2) The harmonics of the output voltage are large, and the pollution to the power grid is relatively serious;
[0006] (3) The grid-connected current is large, the line loss is large, and the efficiency is low

Method used

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Examples

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Embodiment Construction

[0022] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples serve to illustrate the present invention, but do not limit the scope of the present invention.

[0023] Such as image 3 Shown is a structural diagram of the photovoltaic grid-connected inverter described in the embodiment of the present invention. The photovoltaic grid-connected inverter of the present invention includes: at least two inverter units 1 and their control units 2, and the inverter unit 1 specifically includes a three-phase inverter circuit 11, a filter circuit 12, and a transformer circuit connected in sequence. Circuit 13; the input terminals of each three-phase inverter circuit 1 are respectively connected to the solar panel; the primary side of the transformer circuit 13 is a delta connection, and the secondary side is three groups of direct coils connected head to...

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Abstract

The invention belongs to the technical field of solar photovoltaic power generation and particularly relates a photovoltaic grid-connected inverter which comprises at least two inversion units and control units thereof, wherein each inversion unit comprises a three-phase inversion circuit, a filtration circuit and a transformation circuit which are sequentially connected; the input end of each three-phase inversion circuit is connected with a solar panel, a primary side of each transformation circuit adopts the delta connection method, and a secondary side of each transformation circuit is formed by three groups of direct coils in head-tail connection; and a tail terminal of the transformation circuit at the last end is connected to a neutral point, and a front terminal of the transformation circuit at the foremost end is connected to a power grid. Compared with a traditional inverter, the photovoltaic grid-connected inverter has the advantages of low switching frequency, low switching loss and small output harmonic waves, and can provide greener energy for the power grid.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic power generation, and in particular relates to a photovoltaic grid-connected inverter. Background technique [0002] As the world's energy shortage and environmental pollution become more and more serious, energy and the environment have become major basic issues facing mankind in the 21st century. The development and application of clean and renewable energy has attracted more and more attention from countries all over the world. As a clean, safe and green renewable energy, solar energy is gradually becoming one of the main alternatives to highly polluting fossil energy. In recent decades, solar photovoltaic power generation technology has achieved unprecedented development, among which photovoltaic grid-connected power generation technology has become one of the main ways to use solar energy today. Carrying out research on grid-connected inverter systems for solar photovoltaic power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M7/49H02J3/38
CPCY02E10/563Y02E10/56
Inventor 高冬青欧阳君
Owner 北京国电四维清洁能源技术有限公司
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