公开(公告)号：US10811996B2

公开(公告)日：2020-10-20

申请号：US16337547

申请日：2017-09-29

申请人： Fronius International GmbH

发明人： Johannes Starzinger ,  Martin Nagelmueller

IPC分类号： H02M7/49 ,  H02M7/5387 ,  H02M7/493

摘要： The invention relates to a method for operating an inverter (1) and to an inverter (1) for converting a direct voltage (UDC) into an alternating voltage (UAC) with a specified grid frequency (fAC) for supplying loads (12) and/or feeding into a supply grid (13), comprising a direct voltage input (2) and multiple AC power units (6) which are connected in parallel and comprise semiconductor switches (7) in a bridge circuit and freewheeling diodes (8) arranged parallel thereto. The outputs of the AC power units (6) are connected to an alternating voltage output (10) via a respective inductivity (9). A common controller (11) is provided for synchronously controlling the semiconductor switches (7) of the AC power units (6) connected in parallel with a switching frequency (fS) in order to prevent imbalances between the parallel AC power units (6), said controller (11) being designed to block the semiconductor switches (7) of the AC power units (6) during individual zero crossings of the output alternating current (IAC) over a specified duration (tF) such that the inductivities (9) can be discharged via the freewheeling diodes (8) of the semiconductor switches (7) and the sub-output currents (IAi) of the parallel AC power units (6) can thus be balanced.

公开(公告)号：US09929673B2

公开(公告)日：2018-03-27

申请号：US14685723

申请日：2015-04-14

申请人： FRONIUS INTERNATIONAL GMBH

发明人： Joachim Danmayr ,  Johannes Starzinger ,  Julian Landauer

IPC分类号： H02J1/10 ,  H02M7/44 ,  H02M1/36 ,  H02M3/00 ,  H02M1/00

CPC分类号： H02M7/44 ,  H02M1/36 ,  H02M3/00 ,  H02M2001/007 ,  Y02E10/56

摘要： A method for feeding energy from photovoltaic modules (2) of a photovoltaic system (1) into a supply grid (5), or to a load, converts the DC voltage (UDC) generated by the photovoltaic modules (2) in an inverter (3) with an intermediate circuit (7) with a capacitor (CZW) and with a DC/AC-converter (8) into an AC voltage (UAC), and in a feed-in mode of operation the inverter (3) is connected via a switching device (4) to the supply grid (5), or to the load, together with an inverter (3) for executing the method. For conservation of the switching device (4) the input power (Pe) of the photovoltaic modules (2) is determined in a test procedure, and the switching device (4) of the inverter (3) is activated if the input power (Pe) of the photovoltaic modules (2) as determined is greater than or equal to a specified minimum input power (Pe,min).