Electrical power systems for distributing electrical power in aircraft are described. One such electrical power system comprises: 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 each dc load channel has a respective index n=(1, . . . , N) and R<N≤2R. The switching arrangement is operable to connect the r-th power channel to the n-th load channel according to a relationship r(n).

There are provided a motor control device, an electric power steering device, and a vehicle that allow an electric motor to be accurately drive-controlled even when a failure occurs in a motor electric angle detection unit that detects a motor electric angle. When at least one of a resolver and an angle computation unit is diagnosed as being abnormal in an initial diagnosis after a system restart, a motor electric angle initial value is estimated on a basis of a response output of a three-phase electric motor in response to input of a motor drive signal to the three-phase electric motor, a motor electric angle estimation vale is calculated on a basis of an output shaft rotation angle detection value detected by an output-side rotation angle sensor and a relative offset amount estimated on a basis of the estimated motor electric angle initial value, and the three-phase electric motor is drive-controlled on a basis of the calculated motor electric angle estimation value.

An overcurrent protection system for a mobile irrigation system. The overcurrent protection system includes a number of control panels each including a controller configured to generate a motor control signal for activating one of the motors of the mobile irrigation system, transmit the motor control signal to the motor, determine a current magnitude of electrical current passing through a motor power branch line electrically connected to the motor, and restrict current to the motor if the current magnitude is above a current magnitude threshold. The controller is further configured to set the current magnitude threshold according to one of a plurality of motor operation stages. The current magnitude threshold can also be set remotely.

An overcurrent protection system for a mobile irrigation system. The overcurrent protection system includes a number of control panels each including a controller configured to generate a motor control signal for activating one of the motors of the mobile irrigation system, transmit the motor control signal to the motor, determine a current magnitude of electrical current passing through a motor power branch line electrically connected to the motor, and restrict current to the motor if the current magnitude is above a current magnitude threshold. The controller is further configured to set the current magnitude threshold according to one of a plurality of motor operation stages. The current magnitude threshold can also be set remotely.

A propulsion system for an electric vehicle comprising a high voltage battery unit having a first high voltage battery connected in series with a second high voltage battery, which may also be referred to as a first and second battery bank, and one or more power inverters arranged to connect the battery banks to one or more electric machines. The one or more power inverters and the one or more electric machines are configured to form a first and a second three-phase system. The described architecture incorporating dual battery banks, and dual and/or multiphase inverters and electric machines can provide enhanced redundancy and limp home functionality in cases where a fault or error occurs in the inverter and/or in the electric machine so that a faulty three-phase system can be operated in a safe-state mode.

A propulsion system for an electric vehicle comprising a high voltage battery unit having a first high voltage battery connected in series with a second high voltage battery, which may also be referred to as a first and second battery bank, and one or more power inverters arranged to connect the battery banks to one or more electric machines. The one or more power inverters and the one or more electric machines are configured to form a first and a second three-phase system. The described architecture incorporating dual battery banks, and dual and/or multiphase inverters and electric machines can provide enhanced redundancy and limp home functionality in cases where a fault or error occurs in the inverter and/or in the electric machine so that a faulty three-phase system can be operated in a safe-state mode.

The present invention relates to a method for operating a power generating assembly in the event of a fault, wherein the power generating assembly comprises a PMG comprising at least first and second sets of stator windings, wherein each set of stator windings is connected to a power converter via a controllable circuit breaker, the method comprising the steps of detecting a fault associated with the first set of stator windings, and lowering, such as interrupting, the current in the second set of stator windings, and, after a predetermined delay, lowering, such as interrupting, the current in the first set of stator windings. The present invention also relates to a power generating assembly being capable of handling such faults, and a wind turbine generator comprising such a power generating assembly.

The present invention relates to a method for operating a power generating assembly in the event of a fault, wherein the power generating assembly comprises a PMG comprising at least first and second sets of stator windings, wherein each set of stator windings is connected to a power converter via a controllable circuit breaker, the method comprising the steps of detecting a fault associated with the first set of stator windings, and lowering, such as interrupting, the current in the second set of stator windings, and, after a predetermined delay, lowering, such as interrupting, the current in the first set of stator windings. The present invention also relates to a power generating assembly being capable of handling such faults, and a wind turbine generator comprising such a power generating assembly.

A system includes a controller for a direct-current (DC) to alternating current (AC) inverter, the controller comprising: a memory configured to store instructions; and at least one processor configured to execute the stored instructions to perform operations including: generating a fault condition Pulse-Width Modulated (PWM) signal to control an active discharge of the inverter in a fault condition by alternately: turning on a first switch group of the inverter while turning off a second switch group of the inverter, and turning on the second switch group of the inverter while turning off the first switch group of the inverter.

A system includes a controller for a direct-current (DC) to alternating current (AC) inverter, the controller comprising: a memory configured to store instructions; and at least one processor configured to execute the stored instructions to perform operations including: generating a fault condition Pulse-Width Modulated (PWM) signal to control an active discharge of the inverter in a fault condition by alternately: turning on a first switch group of the inverter while turning off a second switch group of the inverter, and turning on the second switch group of the inverter while turning off the first switch group of the inverter.