Electrical power systems
AssigneeROLLS-ROYCE plc
InventorGraham P Bruce
Life of this patent
Estimating the term…
Abstract
Electrical power system includes: one or more rotary electric machines, each mechanically coupled to a gas turbine engine spool; a set of converter circuits connected to the one or more rotary electric machines for conversion between alternating (ac) and direct current (dc), wherein one or more rotary electric machines and the set of converter circuits are arranged to output a number R≥2 of dc power channels, each dc power channel having a respective index r=(1, . . . , R); and a group of N dc load channels connected to the R dc power channels by a switching arrangement, wherein N>R and each dc load channel has a respective index n=(1, . . . , N). The switching arrangement is operable to connect a number Q≥1 of the N load channels to at least two different power channels of the R power channels.
Claims19
An electrical power system for distributing electrical power in an aircraft, the electrical power system comprising:
- an electrical power source configured to output a number R≥2 of dc power channels, each dc power channel having a respective index r=(1, . . . , R);
- and
- a group of N dc load channels connected to the R dc power channels by a switching arrangement, wherein N>R and each dc load channel has a respective index n=(1, . . . , N),
- wherein the switching arrangement is operable to connect a number Q≥1 of the N load channels to at least two different power channels of the R power channels, and
- wherein the system further comprises a controller configured to control the operation of the switching arrangement to control which of the power channels the N load channels receive electrical power from, and
- wherein the N dc load channels are connected to and power a poly-phase electrical load, and the controller is configured to control the switching arrangement so that, in a no fault condition, pairs of phases of the poly-phase electrical load are powered by the same power channels so as to cancel harmonics in current supplied by the power channels.
Dependencies are inferred from the claim text.