Method for controlling a compressor system, compressor for compressing a working medium, compressor system and refrigeration circuit system for carrying out a refrigeration cycle process

Abstract

A method for controlling a compressor system includes an electrically operated compressor for compressing a working medium, and a further electrical load. The compressor includes an electric motor for compressing the working medium, an inverter supplying the electric motor with single- or multi-phase alternating current, a power factor correction filter (PFC) supplying the inverter with direct current and whose current input for supplying power to the compressor connects to a grid current source providing alternating current. For supplying power thereto the further electrical load connects to the same grid connection point as the power factor correction filter. The method includes operating the compressor system with electrical current from the grid current source, determining at least one current characteristic value of the further load, and controlling the power factor correction filter of the compressor at least in dependence of the determined at least one current characteristic value of the further load.

1 . A method for controlling a compressor system, and which comprises an electrically operated compressor, which is configured for compressing a working medium, and a further electrical load,
 wherein the compressor in turn comprises:
 an electric motor for providing a mechanical movement for compressing the working medium; 
 an inverter, which supplies the electric motor with single- or multi-phase alternating current; and 
 a power factor correction filter, which supplies the inverter with direct current and whose current input for supplying power to the compressor is connected to a grid connection point of a grid current source providing alternating current; 
   and, for supplying power to the further electrical load, the further electrical load is connected to the same grid connection point as the power factor correction filter,   wherein the method comprises:
 operating the compressor system with electrical current from the grid current source; 
 determining at least one current characteristic value of the further load, which describes a current consumption of the further load; and 
 controlling the power factor correction filter of the compressor at least in dependence of the determined at least one current characteristic value of the further load. 
   
     
     
         2 . The method according to  claim 1 , wherein
 the controlling of the power factor correction filter comprises:
 setting an operating parameter of the power factor correction filter, which determines the direct current output by the power factor correction filter and/or which influences the alternating current tapped from the grid current source by the compressor, at least in dependence of the determined at least one current characteristic value of the further load. 
   
     
     
         3 . The method according to  claim 2 , wherein
 the power factor correction filter comprises at least one transistor unit, and the setting of the operating parameter of the power factor correction filter for controlling the power factor correction filter in turn comprises:
 setting a control signal of the at least one transistor unit at least in dependence of the determined at least one current characteristic value of the further load. 
   
     
     
         4 . The method according to  claim 1 , wherein
 the determined at least one current characteristic value is an electrical current strength or an electrical power.   
     
     
         5 . The method according to  claim 1 , wherein
 the further load and the compressor are connected parallel to one another at the grid connection point.   
     
     
         6 . The method according to  claim 1 , wherein
 the determining of the at least one current characteristic value of the further load comprises:
 detecting a current variable of an electrical current present at a current input of the further load; 
 determining the at least one current characteristic value on the basis of the detected current variable. 
   
     
     
         7 . The method according to  claim 1 , wherein
 the determining of the at least one current characteristic value of the further load comprises:
 providing a calculation model, which describes the electrical structure of the further load, comprising one or more electrical characteristic variables of the further load; 
 calculating the at least one current characteristic value on the basis of the provided calculation model; 
 outputting the calculated at least one current characteristic value as a determined current characteristic value of the further load. 
   
     
     
         8 . The method according to  claim 1 , wherein
 the power factor correction filter comprises a rectifier with an input for alternating current and an output current.   
     
     
         9 . The method according to  claim 8 , wherein
 the method further comprises:
 detecting a current variable of an output current of the rectifier at the output of the rectifier; 
   wherein the controlling of the power factor correction filter of the compressor takes place in additional dependence on the detected current variable of the output current of the rectifier.   
     
     
         10 . The method according to  claim 1 , wherein
 the power factor correction filter comprises a totem-pole PFC converter.   
     
     
         11 . The method according to  claim 10 , wherein
 the method further comprises:
 detecting a current variable of an input current of the totem-pole PFC converter, 
   wherein the controlling of the power factor correction filter of the compressor takes place in additional dependence on the detected current variable of the input current of the totem-pole PFC converter.   
     
     
         12 . The method according to  claim 1 , wherein
 the method further comprises:
 detecting a current variable of an electrical current present at the current input of the power factor correction filter; 
   wherein the controlling of the power factor correction filter of the compressor takes place in additional dependence on the detected current variable of the electrical current present at the current input of the power factor correction filter.   
     
     
         13 . The method according to  claim 1 , wherein
 the controlling of the power factor correction filter takes place under the provision that one or more characteristic values of an electrical current tapped from the compressor system at the grid connection point lie below a respectively predetermined limit value.   
     
     
         14 . The method according to  claim 1 ,
 wherein the compressor system is designed as part of a refrigeration circuit system.   
     
     
         15 . A compressor for compressing a working medium, comprising:
 an electric motor for providing a mechanical movement for compressing the working medium;   an inverter, which supplies the electric motor with single- or multi-phase alternating current;   a power factor correction filter, which supplies the inverter with direct current and whose current input for supplying power to the compressor is connectable to a grid connection point of a grid current source providing alternating current;   a control device, which at least configured to control the power factor correction filter;   wherein the compressor is operated electrically and, in the event that the compressor and a further electrical load are connected to the same grid connection point of a grid current source providing alternating current, the control device is configured to determine at least one current characteristic value of the further load, which describes a current consumption of the further load, and to control the power factor correction filter at least in dependence of the determined at least one current characteristic value of the further load.   
     
     
         16 . A compressor system comprising:
 an electrically operated compressor for compressing a working medium according to claim  15 ; and   a further electrical load;   wherein the compressor and the further load are provided to be connected to a same grid connection point of a grid current source providing alternating current, wherein for this case the control device of the compressor is configured to determine at least one current characteristic value of the further load, which describes a current consumption of the further load, and to control the power factor correction filter at least in dependence of the determined at least one current characteristic value of the further load.   
     
     
         17 . A refrigeration circuit system for carrying out a refrigeration circuit process on the basis of a working medium, wherein the refrigeration circuit system comprises a compressor system according to  claim 16 , the compressor of which is configured to compress a working medium of the refrigeration circuit system.