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Method and control device for operating an inverter

A control device and inverter technology, which is applied to the output power conversion device, the conversion of AC power input to AC power output, and the conversion of AC power input to DC power output, etc., can solve problems such as structural consumption and achieve small switching loss. , small internal resistance, the effect of minimizing switching loss

Inactive Publication Date: 2015-12-09
SMA SOLAR TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an electrical signal in an electrically isolated area is required for monitoring the switch, this also entails a great deal of structural effort

Method used

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  • Method and control device for operating an inverter
  • Method and control device for operating an inverter
  • Method and control device for operating an inverter

Examples

Experimental program
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Embodiment Construction

[0016] figure 1 The structure of an inverter 10 is shown, which converts the DC voltage power supplied by a generator 65 at a generator connection 60 into a grid-compliant AC voltage and feeds it into a grid 100 via a grid output 110 . For this purpose, the generator voltage at the input capacitor 61 is first raised to the first intermediate circuit voltage of the first intermediate circuit 50 via the step-up converter 20 . The intermediate circuit voltage is converted from the first intermediate circuit via a high-frequency bridge 30 into a high-frequency alternating voltage, which is applied to the primary winding of a high-frequency transformer 35 . The secondary winding of the high-frequency transformer 35 is connected to a rectifier 80 , which converts the converted high-frequency alternating voltage back into a direct voltage and applies it to the second intermediate circuit 51 . The DC voltage is fed from the second intermediate circuit into the connected grid 100 via ...

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Abstract

A method for limiting an output power of an inverter having an output bridge and an upstream boost converter includes determining a first measurement variable representative of a bridge temperature and a second measurement variable representative of an output power of the inverter. The method also includes determining a third measurement variable representative of a generator voltage at generator connections of the inverter or a fourth measurement variable representative of an output voltage at a power output of the inverter, and reducing the output power supplied to a power supply grid to a reduced power value. The reduced power value is determined based on the first measurement variable, the second measurement variable and at least one of the third and fourth measurement variables. A control device having such functionality is also disclosed.

Description

technical field [0001] The invention relates to a method for operating an inverter, in particular as part of an energy generating plant, and to a control device for carrying out the method, in particular as an inverter parts of the device. Background technique [0002] Inverters are used to convert the power generated as DC voltage by a generator, for example by means of a photovoltaic generator, into grid-compliant AC voltage power. The losses in the inverter lead to heating of the inverter, in particular to heating of the power semiconductors as switching elements, which can be damaged due to overheating. It is therefore necessary to monitor the temperature of these switching elements and if necessary to reduce the switching power of the inverter if a limit value for the switching temperature is exceeded. For this purpose, the modules containing the power semiconductors within the inverter have monitoring elements for temperature monitoring, such as thermal diodes or NTC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/32H02M1/00
CPCH02M5/458H02M1/32H02M7/53871H02M2001/007H02M1/007
Inventor O·基尔希L·贝思克B·索法利
Owner SMA SOLAR TECH AG