Method to optimize operation of a transformer cooling system, the corresponding system and a method to determine the VFD capacity

A method to improve operation of a transformer cooling system, wherein the transformer cooling system comprises a central controller, a transformer, a plurality of motor-fan chains to cool down said transformer, a shared variable frequency drive (VFD) bus fed by a VFD, and an alternating current (AC) bus fed by an AC power source, both of the VFD bus and the AC bus being controlled by said central controller, and both of the VFD bus and the AC bus being shared by motor-fan chains, the method comprising:

• preprocessing an initial data input by a user;
• collecting an on-line data corresponding to a transformer loss associated with driving at least one motor-fan chain of the plurality of motor fan chains with at least one of the VFD bus or the AC bus;
• calculating a control command of the transformer cooling system to meet a requirement of a transformer loss by computing a control objective based on initial data and the on-line data, wherein the control command includes an instruction to selectively drive, based at least in part on the transformer loss, at least one motor-fan chain of the plurality of motor fan chains with at least one of the VFD bus or the AC bus;
• and
• executing control actions associated with the control command by selectively driving, based at least in part on the transformer loss, the at least one motor-fan chain with at least one of the VFD bus or the AC bus.