Procedure to control the chains of the solar modules in a photovoltaic installation and a photovoltaic inverter to implement the procedure

摘要

Procedure to test the chains (3) of a photovoltaic installation, which generate a direct current voltage (UDC), with at least one photovoltaic inverter (1) to convert the direct current voltage (UDC) of the chains (3) into an alternating current voltage (UAC) for the supply in a supply network (5) and / or a consumer (6), each with two connection lines (11.12) per chain (3), comprising a device control (7), a DC / DC inverter (28), an intermediate circuit (8), a DC / AC inverter (9) and an MPP tracker (26), where each chain (3) is connected individually by means of the control device (7) with the help of switching contacts (13) of the integrated relay (14) in each connection line (11, 12) in order to determine at least individual values of the characteristic U / I curve of each chain (3) by means of current measurement devices (15) arranged in each connection line (11) for each chain (3) and inte degrees in the photovoltaic inverter (1) and by means of a voltage measuring device (16), where each chain (3) has an insulation resistance (RI), characterized in that the polarity of each chain (3) in the solar modules (2) and the insulation resistance (RI) of each chain (3) are determined and stored in a memory (10) connected to the control device (7), then the power operation of the photovoltaic system is started and the minus the individual values of the characteristic U / I curve of each chain (3) of the solar modules (2) are determined automatically and under command, at predetermined time intervals (Δt) or depending on certain operational events or operating parameters and because also in the region of the chain (3), environmental parameters are measured and supplied to the control device (7), whose values are stored in the memory (10) in order to generate a test report and the determined values are converted. they are, if necessary, to the standard test conditions (STC) under defined environmental conditions and are compared with the values stored in the memory (10) and, in the case of inadmissible deviations of the determined values and of the converted values, if necessary, a warning is issued for the standard test conditions (STC), with respect to the values stored in the memory (10)