125 results about "Electric power conversion" patented technology

An electric power conversion apparatus includes an inverter configured to convert input DC power into AC power, and a control device configured to control the inverter, wherein the control device is configured to prioritize limiting one of an active current and a reactive current output from the inverter over the other of the active current and the reactive current, so that an apparent current output from the inverter becomes less than or equal to a limit value.

The invention belongs to the technical field of power electronic conversion, and particularly discloses an MMC-STATCOM system direct optimization model prediction control method and system, and the method comprises the steps: respectively calculating a differential mode voltage and a common mode voltage between an upper bridge arm and a lower bridge arm of each phase; third harmonic voltage is injected into the upper bridge arm and the lower bridge arm of each phase to obtain upper bridge arm voltage and lower bridge arm voltage of a newly-added third voltage component of each phase; and based on the obtained voltage of the upper and lower bridge arms of the newly added three-time voltage component, determining the input number of the sub-modules of the upper and lower bridge arms of each phase by adopting a nearest level approximation modulation strategy, and determining the input sub-module of each bridge arm according to the capacitor voltage sequence of each sub-module of the bridge arms and the current direction. According to the method, on the basis of keeping a discrete control structure, direct injection of third harmonic voltage under an MPC framework is achieved, and higher real-time performance and expandability are achieved.

A power conversion system is provided, which system includes a first power converter including power electronic switches of a first type that are switchable to provide electric power conversion; and a second power converter connected in parallel to the first power converter. The second power converter includes power electronic switches of a second type that are switchable to provide electric power conversion. The second type is different from the first type. The second type of power electronic switches includes wide bandgap semiconductor switches. The system further includes a controller configured to operate the power conversion system in a first operating mode in which the second power converter is operated at a first switching frequency, and in a second operating mode in which the second power converter is operated at a second switching frequency of the power electronic switches and the first power converter is operated to provide power conversion.

An electric apparatus includes: an electric power storage device; a rotary electric machine; an electric power control unit; and an angle sensor that acquires a phase of a rotor of the rotary electric machine. The electric power control unit acquires a target DC component of a current that flows through the β-phase first coil and the β-phase second coil of the rotary electric machine by electric power supplied from an external AC electric power source in accordance with a stop phase of the rotor acquired by the angle sensor at the time of stopping of the rotary electric machine and charges the electric power storage device by an electric power conversion operation based on the target DC component.

The invention provides a method and equipment, and relates to the technical field of energy management and electric power conversion, and the method comprises the steps: calculating the maximum feedback electric quantity and the optimal feedback duration according to the identity information of a feedback equipment node and a feedback capability parameter, and generating a corresponding feedback capability model; inputting the historical power consumption data, the current environment data and the regional activity data in a preset historical time period into a preset machine learning model, and outputting a power grid load curve in a future preset time period; according to a power grid load curve and a feedback capability model, dividing feedback equipment nodes into a plurality of feedback groups and distributing peak-shifting feedback time periods, and generating an initial feedback distribution scheme; and calculating a specific feedback parameter of each feedback equipment node based on the priority sequence and the feedback time window, and distributing the specific feedback parameter to the corresponding feedback equipment node. By implementing the method, power grid voltage and frequency fluctuation caused by excessive concentration of feedback electric quantity can be reduced, and the stability of power grid operation is ensured.

The invention relates to the technical field of power electronic conversion, in particular to a seamless switching control method and system for grid-connected and off-grid modes of an energy storage converter, and the method comprises the following steps: mode pre-judgment, seamless switching, virtual inertia and damping simulation and re-grid-connected pre-synchronization. The system comprises a multi-mode detection and pre-judgment module, a unified multi-mode controller, a state synchronization and observer module and a phase-locked loop-free synchronizer. According to the method, the whole process control problem from grid connection to grid disconnection and then grid connection is solved, the seamless degree of switching reaches a new level, and the active supporting capacity and friendly grid connection performance of the energy storage converter serving as a micro-grid core control unit are comprehensively improved; and the method has an important value for promoting the construction and development of a high-reliability micro-grid.

An arrangement for electric power conversion and an electric drive comprises a power converter that includes three legs, an electric motor including three open-end stator windings respectively having first and second ends, and a power switch. The first ends of the stator windings are coupled to respective legs of the three legs of the power converter, and the second ends of the stator windings are coupled together and have a same electric potential. The power switch is configured to selectively disconnect one of the second ends of the stator windings from all other second ends to establish at most two distinct electric potentials. The at most two distinct electric potentials are coupled to respective legs of a power grid interface coupled to the arrangement.

To provide a cylinder heater capable of easily securing an installation place of an electrode for causing an electric current to flow in a cylinder liner.SOLUTION: A cylinder heater includes: an electric power conversion device that converts a DC electric current output from a DC power source into a high-frequency AC electric current; and a transformer having a primary side coil electrically connected to the electric power conversion device and a secondary side coil electrically connected to electrodes provided to correspond to one side and the other side of a cylinder liner, respectively in an axial direction of a cylinder of a cylinder block provided in an internal combustion engine. In the cylinder heater, the electrode on one side is electrically connected to a lower part of the cylinder block and the electrode on the other side is a grounding electrode of an ignition plug.SELECTED DRAWING: Figure 1

An electric power conversion apparatus includes: an electric power input terminal; an electric power output terminal; an electric power conversion circuit; a sensor circuit generating a detection voltage corresponding to a voltage at the electric power output terminal; a control circuit operable based on a first power supply voltage, including an input terminal to receive the detection voltage, and controlling operation of the electric power conversion circuit; and a power supply circuit generating the first power supply voltage and a second power supply voltage. The sensor circuit includes: resistors provided in a path coupling the electric power output terminal to a reference node, the resistors being coupled in series via first and second intermediate nodes, the second intermediate node being coupled to the input terminal; and a first diode including an anode coupled to the first intermediate node, and a cathode to be supplied with the second power supply voltage.

A switching control unit is applicable to an electric power conversion apparatus. The electric power conversion apparatus includes: a transformer; an inverter circuit including first switching devices; a synchronous rectifying circuit including second switching devices serving as rectifying devices; and a smoothing circuit. The switching control unit includes: a first current detection circuit detecting a peak current value of a secondary current; a second current detection circuit detecting an output current value; and a control circuit controlling respective operations of the first switching devices of the inverter circuit and respective operations of the second switching devices of the synchronous rectifying circuit. The control circuit sets a timing of switching from an on-state to an off-state of each of the second switching devices based on the peak current value detected by the first current detection circuit and the output current value detected by the second current detection circuit.

An electric power conversion system comprising: an alternating current (AC) source comprising a plurality of AC terminals for conducting AC power; a voltage source electrically coupled to the AC terminals; and a controller operably coupled to the voltage source, the controller being configured to: operate the voltage source to apply a fault reducing voltage at the AC terminals that reduces an AC line-to-line fault current (If).

The invention discloses a generator parallel operation control method and system based on carrier synchronization, and belongs to the technical field of power electronic conversion. A generator parallel operation control method based on carrier synchronization is characterized in that the method is applied to a system comprising a synchronous enabling unit, a synchronous signal transmitter and a plurality of parallel converters connected with the synchronous enabling unit and the synchronous signal transmitter respectively, and the method comprises the following steps: for each converter, determining a counting difference value and sending the synchronous enabling unit; the synchronous enabling unit feeds back an adjusting signal to the corresponding converter based on a comparison result of the difference value sent by the carrier wave processor of each converter and a count value threshold until the difference values sent by the carrier wave processors of all converters are smaller than the count value threshold; then, synchronous enable signals are sent to the converters respectively; and each converter drives the IGBT to realize current conversion based on the synchronous enable signal. According to the method, synchronous impact and circulation are reduced by simulating dynamic approximation of a carrier and an actual carrier.

An apparatus for electric power conversion includes a converter having a regulating circuit and switching network. The regulating circuit has magnetic storage elements, and switches connected to the magnetic storage elements and controllable to switch between switching configurations. The regulating circuit maintains an average DC current through a magnetic storage element. The switching network includes charge storage elements connected to switches that are controllable to switch between plural switch configurations. In one configuration, the switches forms an arrangement of charge storage elements in which at least one charge storage element is charged using the magnetic storage element through the network input or output port. In another, the switches form an arrangement of charge storage elements in which an element discharges using the magnetic storage element through one of the input port and output port of the switching network.

An electric power control system includes: a bidirectional electric power converter including AC and DC terminals, the AC terminal being connected to an AC power system, the DC terminal being connected to a DC power system to which one or more DC power loads are connected, the bidirectional electric power converter mutually converting AC power of the AC power system and DC power of the DC power system; an electric power storage that is connected to the DC power system and stores electric power of the DC power system; and a bidirectional electric power conversion controller that performs first control of controlling an output or input of the AC terminal of the bidirectional electric power converter such that a charge current, discharge current, charge electric power, or discharge electric power of the electric power storage coincides with a predetermined target current value or a predetermined target electric power value.

A capacitor module 1 comprises: a first capacitor unit 10 that includes at least one film capacitor 11; a second capacitor unit 20 that includes a substrate 21 and at least one layered ceramic capacitor 22 mounted on the substrate 21; a first conductor 30 that is electrically connected to a positive-electrode side of the first capacitor unit 10 and a positive-electrode side of the second capacitor unit 20, the first conductor 30 having a first terminal 31 on the side opposite from the first capacitor unit 10 and the second capacitor unit 20; a second conductor 40 that is electrically connected to a negative-electrode side of the first capacitor unit 10 and a negative-electrode side of the second capacitor unit 20, the second conductor 40 having a second terminal 41 on the side opposite from the first capacitor unit 10 and the second capacitor unit 20; a case 50 inside of which the first capacitor unit 10 is housed so that the first terminal 31 and the second terminal 41 are led out to the outside; and a filling resin 60 that fills the interior of the case 50 so that the first capacitor unit 10 is buried. The positive-electrode side of the first capacitor unit 10 is electrically connected to the first conductor 30 by a first connection portion 32, the negative-electrode side of the first capacitor unit 10 is electrically connected to the second conductor 40 by a second connection portion 42, the positive-electrode side of the second capacitor unit 20 is electrically connected to the first conductor 30 at a position between the first terminal 31 and the first connection portion 32, the negative-electrode side of the second capacitor unit 20 is electrically connected to the second conductor 40 at a position between the second terminal 41 and the second connection portion 42, and at least the substrate 21 of the second capacitor unit 20 is immobilized by the filling resin 60.

A main frame part (6Aa) has a first end section (ED1) having a first dimension along a second direction intersecting a first direction. A main terminal part (6Ab) of a lead frame (6A) is directly adjacent to the main frame part (6Aa) in a third direction intersecting the first and second directions. The main terminal part (6Ab) has a second end section (ED2) connected to the first end section (ED1) of the main frame part (6Aa). An outer edge of a resin mold part (4) has an extension section (4e) extending in the second direction. The main frame part (6Aa) has, between a first power semiconductor chip (2a) and the main terminal part (6Ab) in the third direction, a first slit (5) or a first groove that extends over a third dimension in the second direction and has a fourth dimension that is less than the third dimension in the third direction.

The present invention relates to a control system for automatically adjusting the current of an AC arc heater, belonging to the technical field of power electronic current conversion. A PLC control module and a circuit breaker trigger control unit are mainly used to implement thyristor solid-state switches to control the on-off state of different taps of a choke reactor in the circuit, thereby achieving automatic adjustment of the operating current of the AC arc heater. The present invention adopts industrial network technology and PLC technology to achieve automatic adjustment of the current of the AC arc heater, avoiding manual replacement of taps and improving work efficiency. The application of advanced thyristor solid-state switch technology improves the reliability and safety of the equipment and reduces the failure rate of the equipment.

The utility model discloses a standby power consumption control circuit of a multiplexed output power supply, which relates to the technical field of electric power conversion control and comprises a power supply management module, a pulse width modulation (PWM) control module, a conversion module and a power consumption module. The PWM control module and the conversion module are electrically connected with the power consumption module, the power consumption module comprises a monitoring unit and a protection unit, the monitoring unit is electrically connected with the PWM control module and the conversion module, and the protection unit is electrically connected with the conversion module. According to the utility model, through the synergistic effect of the power management module, the PWM control module, the conversion module and the power consumption module, system signals can be monitored, and the output of the PFC circuit and other paths of voltage can be controlled, thereby achieving the purposes of reducing the input power loss in a standby state and improving the efficiency, and effectively preventing the power supply from generating invalid power in the standby state.

An electric power conversion device for a power storage device includes a first control device, an electric power conversion circuit that is configured to output electric power to the power storage device, a drive circuit that generates a drive signal for the electric power conversion circuit by using power supply electric power, a shutoff circuit that shuts off supply of the power supply electric power to the drive circuit, and a detection circuit. The detection circuit is configured to output a shutoff signal to the first control device based on a fact that the shutoff by the shutoff circuit is completed. The shutoff signal indicates that the supply of the power supply electric power to the drive circuit is shut off.

The application discloses a dual-target continuous set model predictive power decoupling control method, and belongs to the technical field of power electronic conversion; the control method comprises the following steps: obtaining a mathematical model of discrete time points of a boost inductor current and a filter inductor current, performing discretization processing on the mathematical model to obtain a prediction model, and calculating inductor current and grid-connected current prediction values at a next time point; obtaining control input variables of the boost inductor current and the filter inductor current, setting a value function, and obtaining optimal conduction duty ratios of a boost side and an inversion side through the input variables and the prediction values; designing a PI voltage outer ring, obtaining reference values required by an inner ring, and performing prediction error compensation; based on the PI voltage outer ring and the optimal duty ratios, designing a notch filter in the voltage outer ring, calculating a feedforward value of a reference current, and performing control decoupling of input current and output current.

To provide an electric power conversion system and a drive system capable of detecting an abnormality in an electric conduction path and a current sensor.SOLUTION: An electric power conversion circuit 4 has invertors 8, 9. The invertor 8 is connected to one end of coils 3U, 3V, 3W via an output line 13. The invertor 9 is connected to the other end of the coils 3U, 3V, 3W via the output line 13. The electric power conversion circuit 4 has a first current sensor 121, a second current sensor 122 and a series current sensor 123. The first current sensor 121 detects a current flowing in the output line 13. The second current sensor 121 detects a current flowing in the output line 14. The series current sensor 123 detects a current flowing in the output line 14. A controller 15 uses detection results of the series current sensor 123 to detect whether or not an abnormality occurs in at least one of the first current sensor 121 and the second current sensor 122.SELECTED DRAWING: Figure 1

This electric power conversion device comprises: a converter circuit that rectifies an AC voltage into a DC voltage; a voltage adjustment board that has a voltage adjustment circuit that steps up or steps down the DC voltage; and an inverter board that has an inverter circuit that converts the stepped-up or stepped-down DC voltage into an AC voltage and supplies the AC voltage to a motor. The inverter board and the voltage adjustment board are separately constituted.

The utility model relates to the technical field of energy storage, in particular to a mobile energy storage all-in-one machine, which comprises a mobile box body, an energy storage bin and a control bin which are arranged in parallel are arranged in the mobile box body, and the control bin comprises an electric power control area, an electric power conversion area and an electric power output and input area which are sequentially arranged from bottom to top; a PC insulating strip is arranged at the bottom of the energy storage bin, AB structural adhesive is arranged at the top of the energy storage bin, and a battery cell module is arranged between the PC insulating strip and the AB structural adhesive; the power control area is provided with a BMS, a fuse and a circuit breaker. The power conversion area is provided with a PCS inverter element; the power output and input area is provided with a docking station, a communication connector assembly and a fast charging and photovoltaic connector assembly. The mobile energy storage all-in-one machine is high in integration level, has the advantages of being small in size and light in weight, and meanwhile reduces manufacturing and installation cost.

A method (300) for controlling a wind turbine generator (104) connected to an electric power grid (102), wherein the wind turbine generator (104) comprises an electric generator (126) and a power converter arrangement (132) for electric power conversion, wherein the method (300) comprises: in response to an indication of a fault condition affecting the wind turbine generator (104), comparing (304) one or more determined electric currents at one or more first locations (162) to one or more determined electric currents at one or more second locations (164), the first and second locations (162, 164) being spaced apart from one another and located between the electric generator (126) and the electric power grid (102); and based on the comparison of the determined electric currents at the first and second locations (162, 164) and if the determined electric current at the first location (162) is different from the determined electric current at the second location (164), terminating (306) an electric power conversion of the power converter arrangement (132).

Provided is an electric power conversion device that suppresses increases in size, cost, and failure risk of the device, and in which phase shift PWM control is applied. First and second legs (leg 1, leg 2) have a DC electric power supply and first to N-th units (41–4N) of a full-bridge circuit connected in parallel to the DC electric power supply. One of the ends of reactors (L11–L(2N)2) are respectively connected to the u-phase and the v-phase of the first to N-th units (41–4N). The other ends of the reactors connected to the u-phase of the first to N-th units (41–4N) of the first leg (Leg 1) are connected to each other to form an output terminal. Furthermore, the other ends of the reactors connected to the v-phase of each unit of the second leg (leg 2) are connected to each other to form an output terminal. The control unit controls switching elements of the first to N-th units (41–4N) of the first and second legs (leg 1, leg 2) by phase shift PWM control.

The utility model relates to the technical field of heat management, in particular to an energy storage cabinet water cooling machine, an energy storage cabinet heat management system and an energy storage cabinet. The energy storage cabinet water cooling machine comprises a heat exchanger provided with a first heat exchange pipeline and a second heat exchange pipeline, a first multi-path on-off adjusting module, a second multi-path on-off adjusting module, a compressor refrigeration module, a dry cooler, a first refrigeration channel and a second refrigeration channel, and the first refrigeration channel and the second refrigeration channel share a refrigeration channel section. And the energy storage cabinet can effectively maintain the proper temperature of the internal components under different environmental conditions. In addition, the energy storage cabinet heat management system comprises an energy storage cabinet water cooling machine, an environment sensor and an in-cabinet sensor and is used for conducting heat management on the energy storage cabinet. According to the energy storage cabinet, the electric power conversion module is arranged in the first refrigeration channel, the battery is arranged in the second refrigeration channel, parts in the energy storage cabinet can work in an ideal temperature range, and therefore the overall performance and reliability of the energy storage cabinet are improved.

The present invention discloses an energy storage container, comprising a box body, an energy storage device, a coolant circulation supply device, a piping system, an electric power conversion device, an output control device, and a refrigeration device. The box body is provided with a first compartment, a second compartment, a third compartment, and a fourth compartment. The second compartment and the third compartment are adjacent to the first compartment, and the third compartment and the fourth compartment are adjacent. The first compartment and the fourth compartment each form a closed chamber, and the second compartment and the third compartment are both connected to the outside. The energy storage device is placed in the first compartment; the coolant circulation supply device is placed in the second compartment, and a first heat dissipation fan is provided therein; the piping system connects a liquid supply port and a liquid return port; the electric power conversion device is placed in the third compartment, and a second heat dissipation fan is provided therein; the output control device is placed in the fourth compartment; and the refrigeration device is placed in the fourth compartment. The various electric devices of the present invention are convenient to connect, reduce costs, meet heat dissipation requirements, and are waterproof and dustproof.

The embodiment of the utility model provides a power module and an electric power conversion device with the same. The power module comprises a busbar, a plurality of capacitors, a plurality of phase units and a wire bar. The plurality of capacitors are arranged on one side of the busbar and are electrically connected with the busbar. The plurality of phase units are arranged on the other side of the busbar. The wire bar electrically connects the plurality of phase units to the busbar. The plurality of capacitors are arranged at intervals. The busbar is provided with a switching part. On the orthographic projection of the plane where the busbar is located, the plurality of capacitors and the switching part are arranged at intervals. And the wire bar is connected with the switching part. According to the scheme provided by the embodiment of the utility model, the wire bar is connected with the switching part of the busbar, and the orthographic projection of the switching part on the plane where the busbar is located and the plurality of capacitors are arranged at intervals. Therefore, the connection between the wire bar and the busbar does not need a connecting column, which is beneficial to shortening the circuit between the busbar and the phase unit, thereby reducing the stray inductance.

The utility model discloses a battery on-line capacity checking system based on a dual active bridge (DAB), relates to the field of electric power conversion, and solves the problems that a post-stage load device has a power failure risk and an abnormal battery cannot be rapidly positioned during the capacity checking operation switching period of a conventional capacity checking device. According to the technical scheme, the system is characterized by comprising a plurality of to-be-tested batteries, an electric switch device and a plurality of capacity checking devices, a plurality of batteries to be tested are connected in series and then connected to a direct current bus through an electric switch device, each battery to be tested is connected in parallel with a capacity checking device, and the capacity checking devices are connected with the direct current bus; the capacity checking device carries out charge and discharge capacity checking on a to-be-tested battery based on a dual active bridge (DAB) structure. The capacity checking device based on the dual-active-bridge DAB topology is additionally arranged, parallel capacity checking is carried out on a single battery, online capacity checking is achieved, redundant and complex switching operation is not needed, capacity checking can be carried out on one or more batteries, the risk of load power failure can be greatly reduced, and the abnormal condition of a certain battery can be rapidly known.

The technology of this application relates to an arrangement for electric power conversion and dual electric drive, a system comprising the arrangement, a method of operating the arrangement, and a computer program for carrying out the method, which enable charging of dual-drive electric vehicles (EV) from a three-phase power grid without producing any torque, while making use of all the power electronics already existing for the traction system and the motor inductances. As such, space is saved and power density, efficiency and reliability are increased.