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Inverter with monitoring of the moisture state and method for operating an inverter

A technology of inverters, moisture, applied in the field of operating such inverters, to achieve the effect of shortening the duration

Active Publication Date: 2014-02-19
SMA SOLAR TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Inverter with monitoring of the moisture state and method for operating an inverter
  • Inverter with monitoring of the moisture state and method for operating an inverter
  • Inverter with monitoring of the moisture state and method for operating an inverter

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Embodiment Construction

[0030] figure 1 An inverter 10 according to the invention is shown which is connected to a DC generator 30 for energy transfer via connection lines DC+, DC−. Arranged inside the housing 20 of the inverter 10 is a converter unit 160 which converts the power of the generator 30 into a grid-compliant AC voltage and transmits it to the connected grid 150 via the connecting line AC. Also, the moisture sensor 110 is accommodated inside the housing 20 and transmits a measurement signal corresponding to a moisture value to the control unit 120 . The control unit 120 is designed to control the inverter 10 , in particular the converter 160 , and is connected to the heating element 130 so that the power supplied to the heating element 130 can be controlled by the control unit 120 . Optionally, the control unit 120 can furthermore also be designed to drive a fan 140 which can dissipate the heat generated by the heating element 130 inside the housing 20 .

[0031] The moisture sensor 110...

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PUM

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Abstract

An inverter for converting electrical power from a DC voltage generator by means of a converter and feeding the electrical power into a power grid is disclosed. In this case, the inverter comprises a moisture sensor inside a housing of the inverter, a control unit for controlling the inverter, said control unit being connected to the moisture sensor for receiving a moisture value from the moisture sensor, and a heating element connected to the control unit. The control unit is designed to control the inverter dependent on the moisture value in such a way that, in the case where a limit value for the moisture is exceeded, the voltage at an input of the converter unit lies below an arc- avoiding voltage value and electrical power is fed to the heating element. Furthermore, a method for operating an inverter of this type is disclosed.

Description

technical field [0001] The invention relates to inverters for converting and feeding electrical power from DC voltage generators, in particular from photovoltaic installations (PV installations), into an electrical grid, and to methods for operating such inverters. Background technique [0002] The generation of electrical energy by means of photovoltaic action is becoming more and more important. At the same time, many decentralized power generation installations of this type have been installed around the world, with the typical power supply that is an essential feature of these installations increasing at the same time. Especially in the case of high power supplies, it is customary to interconnect a large number of PV modules in series to form so-called strings connected to inverters. Therefore, a high DC voltage appears on the input line of the inverter during operation. In order to prevent the formation of arcs within the inverter housing which would damage or destroy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M1/32
CPCH02M7/003Y02E10/563Y02B10/14H02J3/383H02J2300/24H02J3/381Y02E10/56H02M1/32H05B1/0227
Inventor R·安德烈
Owner SMA SOLAR TECH AG