Power conversion systems and methods to control a multiphase multilevel regenerative power converter with multilevel phase circuits that individually include multiple regenerative power stages with respective power stage outputs connected in series, each of the multiple regenerative power stages comprising a DC link circuit a switching rectifier coupled between a respective transformer secondary circuit and the DC link circuit, and a switching inverter coupled between the DC link circuit and the respective power stage output, including a controller that provides inverter switching control signals to control the respective switching inverters, provides rectifier switching control signals to control the respective switching rectifiers, and controls a non-zero phase relationship between the rectifier switching control signals of the respective switching rectifiers.

An electrical system includes a motor and a plurality of switch pairs, each switch pair having a high-side switch, a low-side switch, and a switch node coupled to the motor. The electrical system also includes gate driver circuitry coupled to each switch of the plurality of switch pairs. The electrical system also includes a controller coupled to the gate driver circuitry. The controller is configured to direct the gate driver circuitry to provide a first set of gate drive signals together with (i.e., overlapping pulses) a second set of gate drive signals, wherein the first set of gate drive signals is phase-shifted relative to the second set of gate drive signals.

A switching arrangement includes a switching unit, which is designed to couple at least one phase of an electric machine of a vehicle in different configurations to a DC onboard power voltage of the vehicle in order to generate an AC phase voltage for the phase of the electric machine. In addition, the switching arrangement has a coil and circuit breakers, wherein the circuit breakers are designed to couple the switching unit via the coil to a DC charging voltage or to decouple same from the charging voltage. The switching arrangement also has a controller which is designed to operate the switching arrangement in a converter mode or in a power inverter mode.

A power converter including a three-phase alternating current input and output, a first power converter stage having a first input and output and a second input and output, an intermediate circuit, a second power converter stage having a first input and output and a second input and output and a direct current input and output, wherein the first input and output of the first power converter stage is electrically connected to the three-phase alternating current input and output, and the second input and output of the first power converter stage is electrically connected to the intermediate circuit.

An object is to obtain a power conversion device that can stabilize output voltage to a DC load. A power conversion device includes an AC/DC conversion unit having a power conversion circuit composed of a plurality of first semiconductor switching elements connected in a fill-bridge form, and a full-bridge chopper circuit unit having a full-bridge chopper circuit composed of a plurality of second semiconductor switching elements connected in a full-bridge form, and connected to a positive terminal and a negative terminal. A neutral point of an AC filter capacitor unit and a neutral point of a DC filter capacitor unit are connected via a neutral point line.

A three-phase converter and a control method thereof are provided. The three-phase converter includes an AC terminal, three filter circuits, three bridge arm circuits, a capacitor module and a DC terminal connected in sequence and a controller. The midpoints of the filter circuits are connected to the midpoint of the capacitor module. The controller controls each bridge arm circuit to work in the first and second modes at different time in one line voltage cycle of the AC source. In the first mode, the bridge arm circuit works in a clamping state. In the second mode, the bridge arm circuit selectively works in a DCM mode or a TCM mode. A switching frequency is limited to be lower than a preset frequency. When the three-phase converter works with over 80% of a rated load, a time length of working in the second mode is ⅓˜⅔ of the line voltage cycle.

A bidirectional AC power converter, having a front-end comprising parallel sets of three switches in series, which connects multi-phase AC to coupling transformer through a first set of tank circuits, for synchronously bidirectionally converting electrical power between the multi-phase AC and a DC potential, and for converting electrical power between the DC potential to a bipolar electrical signal at a switching frequency, controlled such that two of each parallel set of three switches in series are soft-switched and the other switch is semi-soft switched; the coupling transformer being configured to pass the bipolar electrical power at the switching frequency through a second set of the tank circuits to a synchronous converter, which in turn transfers the electrical power to a secondary system at a frequency different from the switching frequency.

Disclosed are three-phase system and distributed control method. The three-phase system comprises three-phase circuits, of which each phase circuit including at least one power conversion cell; and at least three phase controllers for controlling each phase circuit, respectively, each phase controller including a communication interface through which the at least three phase controllers are in communications connection with each other; wherein the phase controllers of each phase circuit is configured for regulating bridge arm voltages of the at least one power conversion cell in the phase circuit by receiving signals sent from the phase controllers of other two phase circuits through the communication interface. The three-phase system and the distributed control method of the invention solve problems of balance of three-phase current and stabilization of three-phase DC voltages by coordination among the three phases. Thanks to the invention, the three phases can be independently controlled to improve control flexibility.

A power conversion system includes a first switch configured to be connected between a first phase of a polyphase alternating current (AC) power source and an electrical load and a first diode configured to be connected between the first phase of the polyphase AC power source and the electrical load, the diode configured to conduct a current from the AC power source to the electrical load. The power conversion system also includes a control unit configured to interface with the first switch to close, responsive to the occurrence of a short circuit fault, the first switch during a negative current portion of the AC cycle of the first phase of the polyphase AC power source and open, responsive to the occurrence of the short circuit fault, the first switch during a positive current portion of the AC cycle of the first phase of the polyphase AC power source.

A converter (20) comprises: a first terminal and a second terminal (24,26), the first terminal (24,26) configured for connection to a first network, the second terminal (34) configured for connection to a second network (40); at least one switching module (44) arranged to interconnect the first terminal (24,26) and the second terminal (34), the or each switching module (44) including at least one module switching element (46) and at least one energy storage device (48), the or each module switching element (46) and the or each energy storage device (48) in the or each switching module (44) arranged to be combinable to selectively provide a voltage source, the or each switching module (44) switchable to control a transfer of power between the first and second networks (40); the or each switching module (44) including a discharge circuit, the or each discharge circuit including a discharge switching element (50) and a discharge resistor (52), the or each discharge switching element (50) switchable to switch the corresponding discharge resistor (52) into and out of the corresponding switching module (44); and a controller (54) configured to selectively control the switching of the or each discharge switching element (50) in: a normal mode to switch the corresponding discharge resistor (52) into the corresponding switching module (44) at a first switch-in voltage level of the or each corresponding energy storage device (48) during a normal operating state of the converter (20) so that a normal operating current flowing in the corresponding switching module (44) is divided between the corresponding discharge resistor (52) and the or each corresponding energy storage device (48) the or each first switch-in voltage level being lower than a voltage level corresponding to a maximum voltage capacity of the or each corresponding energy storage device (44); and a fault mode to switch the corresponding discharge resistor (52) into the corresponding switching module (44) at a second switch-in voltage level of the or each corresponding energy storage device (48) during a fault operating state of the converter (20) so that a fault current flowing in the corresponding switching module (44) is divided between the corresponding discharge resistor (52) and the or each corresponding energy storage device (48), wherein the or each second switch-in voltage level is lower than the corresponding first switch-in v