System for regulating a temperature of a thermal energy carrying fluid in a sector of a fluid distribution network

A method for regulating a temperature of a thermal energy carrying fluid in a sector of a fluid distribution network, the fluid distribution network comprising:

• a feed line for transporting the fluid from a thermal energy source to at least one thermal energy consume located within the sector;
• a return line for transporting the fluid back from the at least one thermal energy consumer to the thermal energy source;
• and a bypass line connecting the return line to the feed line for mixing fluid from the return line into the feed line, wherein the method comprises the steps of:
• determining a temperature of the fluid in the feed line downstream of the bypass line by at least one temperature sensor;
• determining a pressure difference between the feed line and the return line by at least one pressure sensor, or a pressure difference correlating therewith;
• controlling a speed of at least one bypass pump that is arranged at a bypass line connecting the return line to the feed line for mixing fluid from the return line into the feed line, wherein said controlling of the speed of the bypass pump is based on a combination of:
• a closed-loop control to provide a fluid flow in the bypass line for achieving a target feed line temperature based on the determined feed line temperature T*1, wherein a target bypass fluid flow q*(T1) is set to minimize a deviation eT=T*1−T1 between the determined feed line temperature T1 and a target feed line temperature T*1;
• and
• a feed-forward control to compensate uncontrolled fluctuations of the pressure difference between the feed line and the return line based on the determined pressure difference.