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.

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 circuit for a dual voltage range charging station is disclosed. The power circuit comprises a first group comprising at least one DC power module, the first group having a first corresponding terminal and a second corresponding terminal; a second group comprising at least one DC power module, the second group having a first corresponding terminal and a second corresponding terminal; a configuration selection unit operatively connected to the first corresponding terminal of the first group, to the second corresponding terminal of the first group, to the first corresponding terminal of the second group and to the second corresponding terminal of the second group; wherein in a first configuration, the first corresponding terminal of the first group is operatively connected to the first corresponding terminal of the second group and the second corresponding terminal of the second group is operatively connected to the second corresponding terminal of the second group and a first given voltage is provided between the first corresponding terminal of the first group and the second corresponding terminal of the second group and further wherein in a second configuration, the second corresponding terminal of the first group is operatively connected to the first corresponding terminal of the second group and a second given voltage greater than the first given voltage is provided between the first corresponding terminal of the first group and the second corresponding terminal of the second group.

A power supply system according to the present embodiment includes a plurality of first power converters configured to supply power according to dispatching characteristics of power to be supplied to a load, and a plurality of control devices each configured to associate a change ratio of active power to an output frequency of each of the first power converters with the dispatching characteristics and control each of the first power converters based on the change ratio.

A conversion device comprises: an inductor electrically connected to the AC power grid; a first-stage converter configured to output a bus voltage according to the AC power grid, wherein the first-stage converter comprises an N-level alternating current-direct current (AC-DC) converter, and the N-level AC-DC converter comprises a plurality of switch bridge arms, wherein both an upper bridge arm and a lower bridge arm of each of the plurality of switch bridge arms of the N-level AC-DC converter include a plurality of semiconductor devices connected in series, and a rated withstand voltage Vsemi of each of the semiconductor devices is greater than or equal to (Vbus*δ)/((N−1)*Nseries*λ); and a second-stage converter configured to convert the bus voltage into an output voltage to supply energy to the load.

System and methods for power conversion are provided. Aspects include a first switching module comprising a first set of switches, wherein the first set of switches comprise wide-bandgap devices having a first bandgap, a second switching module comprising a second set of switches, wherein the second set of switches comprise semiconductor devices having a second bandgap, and wherein the first bandgap is larger than the second bandgap, an alternating current (AC) power source connected to the first switching module and the second switching module, a first capacitor bank, a second capacitor bank, and a controller configured to operate the first switching module and the second switching module to create a first direct current (DC) voltage across the first capacitor bank and a second direct current (DC) voltage across the second capacitor bank.

A circuit assembly includes at least one coil assembly with a first coil and a second coil, the first coil being connected to a DC voltage side of a rectifier of the circuit assembly, and the second coil being connected to a power source of the circuit assembly, the first coil and the second coil being coupled to each other via a coupling component of the coil assembly, the coupling component forming a core of each of the coils.

A circuit for use in a switched mode power supply includes a dual-boost power-factor correction converter having an active rectifier stage with first and second rectifier transistors and first and second boost stages each with an inductor and transistor. An active rectifier controller circuit generates control signals for driving the rectifier transistors, respectively, on and off in accordance with an AC input voltage. A PFC controller circuit generates a pulse-width-modulated (PWM) control signal that is based on an output voltage of the boost stages and which is further based on a current sense signal representing the current passing through the active rectifier stage. A logic circuit generates a control signal for the transistor of the first boost stage and a control signal for the transistor of the second boost stage, based on the PWM control signal and at least one of the control signals for the rectifier transistors.

A power supply system according to the present embodiment includes a plurality of first power converters configured to supply power according to dispatching characteristics of power to be supplied to a load, and a plurality of control devices each configured to associate a change ratio of active power to an output frequency of each of the first power converters with the dispatching characteristics and control each of the first power converters based on the change ratio.

The parallel assembly of rectifier modules includes a plurality of rectifier modules connected in parallel, a switch for switching-in and switching-out of the rectifier modules, an assembly frame, being provided therein with a switch accommodating space and a rectifier module accommodating space; a DC bus bar, being arranged at the top of the assembly frame; a plurality of groups of connectors, being fixed at one end close to the back side of the assembly frame; an AC copper bar, being fixed at one end close to the front side of the assembly frame; an extended copper bar, being fixed at one end close to the back side of the assembly frame.