Fronius International Gmbh

Christian Fasthuber

Stefan Breuer

Walter Spitzer

Bernd Hofer

Franz Fischereder

Mario Bairhuber

Reimar Pfeil

Helmut Friedl

Stefan Wieser

David Aitzetmueller

Florian Schuster

Gerald Ortner

Richard Grasböck

Clemens Bittmann

Andreas Hofer

Johann Wilhelm

Michael Sandberger

Johannes Graf

Manfred Anzinger-Weitmann

Ewald Lohninger

Method for optimizing a maximum power point of a solar cell stack having modules, each including an MLSD unit, and an inverter. The MLSD unit shuts down the module when module voltage falls below a first voltage threshold, and switches it on, when a predefined second voltage threshold is exceeded. For optimal performance, the solar cell stack carries out: Defining, changing an electrical control parameter to a first wait value so that the second voltage threshold is exceeded exceeded; maintaining first wait value for a first time period so the modules are switched on by the MLSD units; changing electrical control parameter to a threshold value in a variation range and determining current-voltage curves for the modules in variation range; determining maximum stack power from current-voltage curves of the modules in the variation range; and predefining the determined maximum stack power as the maximum performance point.

Controlling a solar power plant

The aim of the invention is to detect an arc in an assembly for transmitting a direct voltage. This aim is achieved by a communication transformer having a primary winding and a secondary winding, the secondary winding being connected to a transmitting device, which is designed to impress a communication signal onto the secondary winding of the communication transformer, and the primary winding being connected to one of the direct voltage lines in order to feed a communication signal transformed by the communication transformer to one of the direct voltage lines. In order to detect, in the assembly, the arc signal caused by an arc, the secondary winding is connected to an arc detection unit, which is designed to detect an arc signal transformed by the communication transformer.

Arc detection

A photovoltaic, PV, module level monitoring system () comprising a photovoltaic array (PVA) including at least one photovoltaic string (PVS) comprising photovoltaic modules, PVM, () each having a module level device, MLD, () adapted to monitor and/or to control the associated photovoltaic module, PVM, (), wherein each module level device, MLD, () comprises a transceiver adapted to communicate with a transceiver of a base station () of an inverter () connected to said photovoltaic array (PVA), wherein the transceivers are coupled by associated duplexer circuits () to a DC power network comprising power cables () connecting the photovoltaic modules, PVM, () of the at least one photovoltaic string (PVS) of said photovoltaic array (PVA) with the base station () of the inverter (), wherein a signal amplitude of a communication signal, CS, transmitted by a transceiver via its associated duplexer circuit () is adjusted automatically depending on a monitored impedance, Z, of the respective photovoltaic array (PVA).

Method for communication between transceivers of module level devices within a photovaltaic module level monitoring system

To recognize a fault in an arrangement including a transformer having a primary winding connected in series with a DC voltage line and a secondary winding coupled magnetically to the primary winding, and including an evaluation unit that processes a secondary signal on the secondary winding, a signal component at at least one frequency is determined from the secondary signal and a signal level of the signal component is compared with a signal threshold. The fault is detected when the signal level falls below the signal threshold.

AFCI self test

Power transmission system () for power transmission of electric power (P) from a power source (A) to a power sink (A) which is connected to the power source (A) via a power transfer cable (), wherein the power source (A) has a first pole with a first electric potential, which is connected via parallel current lines of a first conducting pair of the power transfer cable () to a first pole of the power sink (A), and a second pole with a second electric potential, which is connected via further parallel current lines of a second conducting pair of the power transfer cable () to a second pole of the power sink (A), wherein, during the power transmission via the current lines, a user data signal can be transmitted between the power source (A) and the power sink (A) via at least one conducting pair with current lines of the same electric potential, uninfluenced by the power transmission.

Power transmission system

For a simple and reliable data communication in an arrangement composed of a plurality of inverters () connected in series and a network monitoring unit () it is provided that the network monitoring unit () superimposes a synchronization pulse () to the network voltage (V) applied to the electrical load (), which synchronization pulse can be detected by the inverters () for temporal synchronization.

Method and arrangement for data communication between an inverter and a network monitoring unit

The invention relates to a method and an apparatus for performing a switching operation with the aid of a operation element (). In order to avoid mechanical components, at least one light-emitting diode () is used as the operating element (), and the voltage (U) on the at least one light-emitting diode () is measured in the switched-off state, and the switching operation is performed when the measured voltage () falls below a pregiven lower threshold () over a pregiven time period ().

Method and apparatus for carrying out a switching process using an operating element including at least one light-emitting diode as a display and a device for measuring the voltage of same

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Wels, Austria

Christian Fasthuber