Abstract: A method and a control arrangement for an electric power conversion system including a plurality of electric power converters, the control arrangement configured to collect data related to the electric power conversion system, determine an optimal configuration for each one of the electric power converters of the electric power conversion system on the basis of collected data through a simulation of the electric power conversion system generate, for each one of the electric power converters, a source code for a firmware of the electric power converter on the basis of the determined optimal configuration for the electric power converter in question, and re-program each one of the electric power converters with the respective source code generated for the electric power converter in question.

Abstract: A method for operating an inverter and an inverter configured to convert DC power supplied from a DC power source into AC power supplied to an AC network by applying maximum power point tracking, MPPT, such that a harmonic content of an AC current supplied from the inverter to the AC network is kept within a predetermined maximum level, wherein during the converting the inverter is configured to detect a need to increase the harmonic content of the AC current supplied from the inverter to the AC network beyond the predetermined maximum level, perform a check whether an increase of the harmonic content of the AC current beyond the predetermined maximum level is allowed, and, if an increase of the harmonic content of the AC current beyond the predetermined maximum level is allowed, raise the predetermined maximum level used in the converting.

Abstract: Photovoltaic apparatus comprising an auxiliary power supply arrangement which is adapted to feed an electric load of the photovoltaic apparatus itself and comprises: first electronic means connected with a DC power source and comprising a first electronic unit adapted to receive a first feeding voltage and provide a first output voltage of DC type; second electronic means connected with an AC power source and comprising a second electronic unit adapted to receive a second feeding voltage and provide a second output voltage of DC type; and third electronic means connected with the first and second electronic means and adapted to reversibly switch among different operation states based on the status of the electric power sources.

Abstract: A method for testing an electric system and an electric system comprising a first inverter (10) and one or more second inverters (11, 12, 1N), and control means (40) configured to start the first inverter (10), provide and sustain with the first inverter (10) an AC voltage of a predetermined magnitude and a predetermined frequency at an AC output of the first inverter, start at least one second inverter (11, 12, 1N), and supply with the first inverter (10) reactive power to the started at least one second inverter (11, 12, 1N).

Abstract: A method and a control arrangement for an electric power conversion system including a plurality of electric power converters, the control arrangement configured to collect data related to the electric power conversion system, determine an optimal configuration for each one of the electric power converters of the electric power conversion system on the basis of collected data through a simulation of the electric power conversion system generate, for each one of the electric power converters, a source code for a firmware of the electric power converter on the basis of the determined optimal configuration for the electric power converter in question, and re-program each one of the electric power converters with the respective source code generated for the electric power converter in question.

Abstract: Photovoltaic apparatus comprising an auxiliary power supply arrangement which is adapted to feed an electric load of the photovoltaic apparatus itself and comprises: first electronic means connected with a DC power source and comprising a first electronic unit adapted to receive a first feeding voltage and provide a first output voltage of DC type; second electronic means connected with an AC power source and comprising a second electronic unit adapted to receive a second feeding voltage and provide a second output voltage of DC type; and third electronic means connected with the first and second electronic means and adapted to reversibly switch among different operation states based on the status of the electric power sources.

Abstract: The present disclosure describes a method and arrangement for damping a resonant component of a common-mode current of a multi-phase power converter comprising an output filter with a virtual ground connection to the power converter. In the method and arrangement, the common-mode current is determined, a feedback signal is formed on the basis of the common-mode current, and the feedback signal is injected into a common mode current reference in order to dampen the resonance frequency component. A delay is added to the feedback signal so that the feedback signal has a sufficient phase margin with respect to a subsequent cycle of the resonance frequency component of the common-mode current.

Abstract: A method for operating an inverter and an inverter configured to convert DC power supplied from a DC power source into AC power supplied to an AC network by applying maximum power point tracking, MPPT, such that a harmonic content of an AC current supplied from the inverter to the AC network is kept within a predetermined maximum level, wherein during the converting the inverter is configured to detect a need to increase the harmonic content of the AC current supplied from the inverter to the AC network beyond the predetermined maximum level, perform a check whether an increase of the harmonic content of the AC current beyond the predetermined maximum level is allowed, and, if an increase of the harmonic content of the AC current beyond the predetermined maximum level is allowed, raise the predetermined maximum level used in the converting.

Abstract: A method for testing an electric system and an electric system comprising a first inverter (10) and one or more second inverters (11, 12, 1N), and control means (40) configured to start the first inverter (10), provide and sustain with the first inverter (10) an AC voltage of a predetermined magnitude and a predetermined frequency at an AC output of the first inverter, start at least one second inverter (11, 12, 1N), and supply with the first inverter (10) reactive power to the started at least one second inverter (11, 12, 1N).

Abstract: The present disclosure describes a method and arrangement for damping a resonant component of a common-mode current of a multi-phase power converter comprising an output filter with a virtual ground connection to the power converter. In the method and arrangement, the common-mode current is determined, a feedback signal is formed on the basis of the common-mode current, and the feedback signal is injected into a common mode current reference in order to dampen the resonance frequency component. A delay is added to the feedback signal so that the feedback signal has a sufficient phase margin with respect to a subsequent cycle of the resonance frequency component of the common-mode current.