Method for determining the type of connection of at least two electrical devices and system comprising several electric devices

Abstract

The invention relates to a method for determining the type of connection of at least two electric devices ( 5 ) whereby each device comprises a similar connector arrangement. The aim of the invention is to increase the reliability during the starting up process and during the operation of a system which comprises several electric units ( 5 ). According to the invention, a first device ( 5 ) modifies the voltage on the connector arrangement ( 11 ) and the modified voltage is determined as a first voltage, such that a second device ( 5 ) determines a second voltage on at least the connector arrangement ( 11 ) and determines whether an electric connection exists or not between the connector arrangements ( 11 ) of the devices ( 5 ) by comparing the determined comparison of the voltages.

1 . A system with several electrical devices all of which have similar connector arrangements, and a control device, wherein a sensor is arranged at each connector arrangement and which sensor is connected with the control device, the control device having means for changing the voltage at each connector arrangement, a comparator for comparing voltages at different connector arrangements with one another, and a memory device in which signals are stored which stored signals are dependent on the outputs of the comparator and indicate whether the connector arrangements of electrical devices are connected with one another or not. 
     
     
         2 . The system according to  claim 1 , wherein the electrical devices are formed as direct current converters. 
     
     
         3 . The system according to  claim 2 , wherein the output connector arrangements of the direct current converters are connected in parallel. 
     
     
         4 . The system according to  claim 3 , wherein the output connector arrangements are connected with an inverter. 
     
     
         5 . The system according to  claim 1 , wherein the electrical devices are formed as inverters. 
     
     
         6 . The system according to  claim 5 , wherein the output connector arrangements of the inverters are connected in parallel. 
     
     
         7 . The system according to  claim 1 , wherein the connector arrangements are formed as input connector arrangements each of which is connected to a source of renewable energy.