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Over-voltage protection for inverters having emv filter on input side

An overvoltage and inverter technology, applied in the field of inverters and overvoltage protection equipment, can solve the problems of complex structure and high price of surge arresters

Active Publication Date: 2014-08-27
SMA SOLAR TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These known surge arresters are complex in construction; they require special self-extinguishing lead fuses; their price is correspondingly high

Method used

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  • Over-voltage protection for inverters having emv filter on input side
  • Over-voltage protection for inverters having emv filter on input side
  • Over-voltage protection for inverters having emv filter on input side

Examples

Experimental program
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Embodiment Construction

[0033] figure 1 A circuit configuration is shown for feeding electrical energy into an AC grid 4 from a photovoltaic installation 1 , here comprising two strings, each string consisting of several solar modules 3 . Feeding takes place via an inverter 5 with a DC input stage 6 . An EMC filter 7 forms part of the DC input stage 6 , the EMC filter 7 comprising an interference suppression inductance 12 in each of the lines 8 to 11 leading from the string 2 . In addition, the EMC filter 7 also includes interference suppression capacitors 13 and 14, which are respectively provided between the two lines 8 and 9 and between the two lines 10 and 11 of each string 2, and also provided respectively between lines 8 to 11 and ground. From the point of view of the solar module 3, i.e. from the point of view of the photovoltaic device acting as a DC voltage source 15, upstream of the EMC filter there are provided surge arresters 16 and 17, said surge arresters Transient overvoltages on ea...

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PUM

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Abstract

An overvoltage protection device preceding an inverter (5), in particular for feeding electrical energy from a DC voltage source (15) into an AC grid (4), said overvoltage protection device comprising a DC voltage input stage (6) , the DC voltage input stage (6) comprises at least two current carrying lines (22 to 24) and an EMC filter (7) with interference suppression capacitors (13, 14) and interference suppression inductors (12), in which In the above overvoltage protection device, from the point of view of the DC voltage source (15), after the EMC filter (7), a surge arrester for diverting the overvoltage to the ground is connected to the line (22 to twenty four).

Description

technical field [0001] The invention relates to an overvoltage protection device for an inverter feeding electrical energy from a DC voltage source, in particular into an AC grid, comprising the features of the preamble of independent claim 1 . Furthermore, a surge arrester is provided which is especially suitable for such overvoltage protection devices. In addition, preferred uses of the new overvoltage protection device and the new surge arrester are respectively proposed. [0002] The invention mainly relates to inverters by means of which electrical energy is fed into an AC grid from a photovoltaic device used as a DC voltage source. In photovoltaic installations, the individual solar modules are usually arranged in groups, so-called strings, which are then connected to the inverter via common cabling. However, the invention is not limited to photovoltaic devices such as DC voltage sources. [0003] The invention is provided in particular for an inverter for feeding ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02H9/04
CPCH02H9/042H02H7/1222H02H3/04Y02E10/56H02H7/122H02H9/04
Inventor A·耶珀H·沃尔夫T·韦斯特法尔S·布雷米克F·格雷泽A·哈林
Owner SMA SOLAR TECH AG