Rolls-royce Corporation

Amit K Gupta

Chandana J Gajanayake

Rejeki Simanjorang

Michael A Zagrodnik

Sundararajan Prasanth

Mohamed Sathik Mohamed Halick

Xiong Liu

Mohd Tariq

Ali I Maswood

Sivakumar Nadarajan

Vaiyapuri Viswanathan

Electrical power systems having variable-voltage DC busses and methods of controlling voltage settings of such busses. One electrical power system comprises: a variable-voltage DC bus; a number N&#x2265;2 of electrical machines, each electrical machine connected to the variable-voltage DC bus via one of a corresponding number N of converters, each electrical machine and corresponding converter having an index n=(1, . . . , N); and a controller configured to select a voltage setting Vfor the variable-voltage DC bus and to provide control signals to the converters to control the voltage setting of the variable-voltage DC bus according to the selected voltage setting V. The controller configured to select a voltage setting Vgreater than or equal to a minimum voltage requirement Vfor the bus. The controller is configured to determine the minimum voltage requirement Vusing present operating speeds of each of the N electrical machines.

Electrical power systems

Electrical power distribution systems and methods of operating electrical power distribution systems are provided. One electrical power distribution system comprises: an electrical power storage unit; a transformer; a first bidirectional converter circuit connected between the electrical power storage unit and a first winding of the transformer; a first DC bus; a second DC bus; a second bidirectional converter circuit connected between the first DC bus and a second winding of the transformer; a third bidirectional converter circuit connected between the second DC bus and a third winding of the transformer; and a controller connected for control of the first, second and third converter circuits to distribute electrical power between the electrical power storage unit, the first DC bus and the second DC bus.

Electrical power distribution

An operating condition monitor () for monitoring an operating condition of a transistor-based power converter (), comprising: a sensing apparatus () configured to measure a turn-off transient energy of the power converter (), a processor () in communication with the sensing apparatus () to receive the measurement of the turn-off transient energy, the processor being configured to: compare the measurement of the turn-off transient energy to a threshold; and issue an event signal based on the comparison to the threshold meeting a comparison criterion. A method (') of monitoring an operating state of a transistor-based power converter is also disclosed.

Monitoring an operating condition of a transistor-based power converter

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Derby, United Kingdom

Amit K Gupta