Electrical power systems

A method of controlling an electrical power system having first and second ac busses connected by an interconnecting transformer;

• respective first and second generator sets connected to the respective first and second ac busses;
• a primary electrical load connected to both the first and second ac busses via a converter arrangement;
• and an auxiliary electrical load connected to the first ac bus, the method comprising:
• controlling the first generator set according to a first droop control profile, the first droop control profile relating an output frequency of the first generator set to an output power of the first generator set;
• and
• controlling the second generator set according to a second droop control profile different from the first droop speed control profile, the second droop control profile relating an output frequency of the second generator set to an output power of the second generator set,
• wherein the first and second generator sets are controlled such that their output frequencies are equal;
• and
• wherein the first and second droop control profiles differ such that, when the first and second generator sets operate at equal output frequencies, an electrical power demand of the auxiliary load is met by the first generator set and an electrical power demand of the primary electrical load is shared equally between the first and second generator sets.

A non-transitory computer readable medium having code stored thereon which, when executed by one or more controllers of an electrical power system, causes the one or more controllers to:

• control a first generator set according to a first droop control profile, the first droop control profile relating an output frequency of the first generator set to an output power of the first generator set;
• and
• control a second generator set according to a second droop control profile different from the first droop speed control profile, the second droop control profile relating an output frequency of the second generator set to an output power of the second generator set,
• wherein the first and second generator sets are controlled such that their output frequencies are equal;
• and
• wherein the first and second droop control profiles differ such that, when the first and second generator sets operate at equal output frequencies, an electrical power demand of the auxiliary load is met by the first generator set and an electrical power demand of the primary electrical load is shared equally between the first and second generator sets.