An electric drive unit includes a polyphase alternating current (AC) motor, an inverter. A motor controller employs field oriented controls to achieve torque and heat production objectives for the electric drive unit. Additional heat may be generated through inverter operation control.

A method for providing grid-forming control of an inverter-based resource includes monitoring the electrical grid for one or more grid events. The method also includes controlling, via a power regulator of a controller, an active power of the inverter-based resource based on whether the one or more grid events is indicative of a severe grid event. In particular, when the one or more grid events are below a severe grid event threshold, thereby indicating the one or more grid events is not a severe grid event, the method includes controlling, via the power regulator, the active power according to a normal operating mode. Further, when the one or more grid events exceed the severe grid event threshold, thereby indicating the one or more grid events is a severe grid event, the method includes controlling, via the power regulator, the active power according to a modified operating mode. Moreover, the modified operating mode includes temporarily re-configuring the power regulator to reduce or eliminate power overloads induced by the severe grid event for as long as the one or more grid events exceed the severe grid event threshold.

A motor control system with adjustable voltage harmonic and a method for correcting the motor control system is disclosed. Based on the input modulation order, the motor control system drives and controls a motor. The motor control system includes: a control order selection unit to generate a control order based on the modulation order, a modulation signal control unit used to generate a pulse output duty ratio modulation signal, a harmonic voltage weight selection unit used to select the weight value of the harmonic wave, a pulse modulation part to generate a control signal based on the modulation signal indicating the pulse output duty ratio, the weight value of the harmonic wave, and the pulse modulation carrier frequency signal. Based on the control signal, the inverter circuit adds the harmonic voltage into the motor-driving voltage to drive the motor, so as to reduce the noise or vibration of the motor.

The invention relates to a half bridge module in a traction inverter for a power electronics unit in an electric or hybrid vehicle, comprising a substrate, semiconductor switching elements on a first side of the substrate, power connections, to which power lines that conduct electrical traction energy are connected, signal connections, to which signal lines are connected for switching the semiconductor switching elements, and a casting compound, which encompasses the substrate and the semiconductor switching elements on the first side of the substrate, wherein the power connections and the signal connections are accessed from the first side of the substrate, such that the power connections and the signal connections extend through the casting compound, seen from the first side of the substrate, and are located within a base area spanning the substrate, seen from the direction they pass through the casting compound.

A method for controlling a fault of a three phase four wire interlinking converter system according to one embodiment of the present disclosure comprises obtaining a first d-q-o coordinate plane based on an internal phase angle of output voltage produced from each phase of an inverter; converting the first d-q-o coordinate plane to a second d-q-o coordinate plane based on the o-axis configured differently from the first d-q-o coordinate plane; obtaining an output voltage vector for determining a fault location by performing d-q transform on the second d-q-o coordinate plane; determining occurrence of a fault and an area related to the fault based on the output voltage vector; and in the occurrence of the fault, allocating a zero voltage vector to the area related to the fault.

A variable frequency motor drive comprises a converter including a rectifier having an input for connection to an AC power source and converting the AC power to DC power. A DC bus is connected to the rectifier circuit. At least one bus capacitor is across the DC bus. An inverter receives DC power from the DC bus and converts the DC power to AC power to drive a motor. A controller is operatively connected to the converter. The controller comprises a speed control controlling the inverter responsive to a speed command to maintain a desired motor speed. A speed foldback control measures DC bus ripple voltage and regulates the speed command responsive to the measured DC bus ripple voltage.

To provide a multi-phase power conversion device control circuit capable of preventing switching elements and driver circuits of a multi-phase power conversion device from being damaged even when arm short circuits have occurred to a plurality of phases simultaneously. The control circuit includes: a current detection unit configured to detect a current flowing through the switching element as a voltage value; an overcurrent detection unit configured to, when a voltage value detected by the current detection unit is higher than a first reference voltage, output an individual overcurrent detection signal Scu; and an overcurrent state control unit configured to, when overcurrent state is detected at the current detection unit of each of two or more phases, output a multi-phase overcurrent signal and short-circuit the control terminal of the switching element to an emitter terminal thereof.

A hybrid drive system has a battery and a combustion engine for energy sources. The system has a traction motor, a generator, a variable voltage converter (VVC), a motor inverter, a generator inverter, a bus coupling the VVC to the inverters, and a controller. The controller regulates engine speed, motor torque, and generator torque. The engine speed is determined according to a driver torque demand. In normal conditions, 1) the controller regulates the engine speed by modifying a generator torque command, and 2) the bus voltage is regulated using the VVC and battery. When the controller detects a fault in which the battery and VVC become unavailable for regulating the bus voltage, then the controller regulates a motor inverter power output to match a sum of a generator inverter power output and an estimated power loss of the inverters in order to regulate the bus voltage.

The present invention discloses a modular intelligent combined wind power converter and a control method thereof. The modular intelligent combined wind power converter comprises separate bridge arm power units, wherein a plurality of the bridge arm power units are connected in parallel to form a high-capacity bridge arm power module, three bridge arm power modules form a three-phase full-controlled bridge power module, and the three-phase full-controlled bridge power module comprises an electric reactor, a capacitor, a fuse and a circuit breaker to form a basic converter module, and the basic converter module forms a high-capacity wind power converter through a modular intelligent combination method.

An object of the present invention is to maintain a heating amount constant when a compressor is heated at the time of shutdown of the compressor, regardless of the influences of production tolerance and environment variations. An inverter control unit causes an inverter to generate a high-frequency AC voltage having a de-energized section in which a voltage applied from the inverter to a motor is zero between a section in which the voltage is positive and a section in which the voltage is negative. At this time, the inverter control unit detects a value of a current flowing to the inverter in a detection section residing from immediately before a start of the de-energized section to immediately after an end of the de-energized section, and causes the inverter to generate a high-frequency AC voltage adjusted according to the detected current value.