公开(公告)号：US20160254783A1

公开(公告)日：2016-09-01

申请号：US15154136

申请日：2016-05-13

Applicant: SMA SOLAR TECHNOLOGY AG

Inventor： ALEXANDER UNRU ,  HARALD DRANGMEISTER ,  TOBLAS MUELLER ,  PABLO CORREA VASQUEZ

IPC: H02S50/00 ,  G01R31/42 ,  G01R31/02

CPC classification number: H02S50/00 ,  G01R31/028 ,  G01R31/42 ,  H02J3/38 ,  H02M7/48

Abstract: A method for determining capacitance values of capacitances of a photovoltaic system including a multiphase inverter which includes an output current filter on an alternating current side thereof and is connected to a multiphase energy supply network via a switching element and is associated with at least one intermediate circuit capacitance on the direct current side thereof is provided. The method includes disconnecting the photovoltaic system from the energy supply network by opening the switching element; operating the inverter to set up an island network after the disconnecting, wherein an in-phase AC voltage is applied to at least two outputs of an inverter bridge of the multiphase inverter and a flow of current is produced between the at least one intermediate circuit capacitance and at least one filter capacitance of the output current filter; measuring currents (Ia, Ib, Ic) flowing at the outputs of the inverter bridge and at least one voltage present at one of the capacitances, and determining a capacitance value of at least one of the capacitances using the determined voltage and the measured currents (Ia, Ib, Ic).

Abstract translation: 一种用于确定包括多相逆变器的光伏系统的电容的电容值的方法，所述多相逆变器在其交流电流侧包括输出电流滤波器，并且经由开关元件连接到多相能量供应网络，并且与至少一个中间电路 提供其直流侧的电容。 该方法包括通过打开开关元件将光伏系统与能量供应网络断开; 操作所述逆变器以在所述断开连接之后建立岛状网络，其中将同相AC电压施加到所述多相逆变器的逆变器桥的至少两个输出端，并且在所述至少一个中间电路电容 和所述输出电流滤波器的至少一个滤波电容; 测量在逆变器桥的输出处流动的电流（Ia，Ib，Ic）和存在于电容之一处的至少一个电压，以及使用所确定的电压和测量的电流来确定至少一个电容的电容值（ Ia，Ib，Ic）。