3209 results about "Rectiformer" patented technology

The invention relates to a dual three-phase permanent magnet synchronous generator rectification system and a direct current voltage stabilization control method thereof. Comprising a dual three-phase permanent magnet synchronous generator, a VSD decoupling converter, a load current observer, a dynamic load feed-forward compensator, a voltage closed-loop controller, a dead-beat predictive current controller, a maximum four-vector SVPWM modulation module and a six-phase rectifier. The double-three-phase topological structure adopted by the invention has the advantages of multiple control degrees of freedom, high reliability and the like. A dynamic load feed-forward compensator is constructed to perform dynamic feed-forward compensation on quadrature-axis current of the motor, so that the recovery time of bus voltage is shortened, and the voltage fluctuation amplitude is reduced; the designed dead-beat predictive current controller optimizes the dynamic characteristics of a current loop, improves the torque tracking performance of the motor, and further improves the voltage stabilization regulation capability of the system. The designed load current observer realizes the analysis redundancy of current detection and improves the reliability of the system.

A circuit arrangement and to a method for operating the circuit arrangement, particularly a circuit arrangement for the DC power supply of a plurality of parallel electrolysers, where the circuit arrangement has a rectifier which converts an input-side alternating voltage into an output-side first DC voltage. Each electrolyser is respectively connected in parallel to the output of the rectifier by a down converter converting the first DC voltage into a second DC voltage such that the second DC voltage drops over the electrolyser. Each of the down converters is controllable and / or regulatable in order to adapt the level of the second direct voltage.

The invention discloses an output conversion system and method for a UPS (Uninterrupted Power Supply), and the system comprises a main power input end which is connected with a bridge rectifier through a first electromagnetic relay; the energy storage module comprises a super capacitor group and a parallel lithium battery group, and is coupled with the bus capacitor through a bidirectional DC / DC converter; the input end of the multi-path regulation and control module is connected with the bus voltage sensor, and the output end is connected with the switching execution unit through a second electromagnetic relay group; the dynamic switching unit comprises an I-GBT matrix and a reverse blocking diode array which are respectively connected with the inverter and the bypass circuit in parallel; and the real-time monitoring module is provided with a current harmonic analysis unit and a load break variable detection unit, and the output end of the real-time monitoring module is connected with the ADC port of the central processor. According to the invention, systematic improvement is realized in three dimensions of electric energy quality guarantee, equipment reliability and dynamic response capability through an original multi-path regulation and control architecture and a deep cooperative intelligent control strategy.

The present teaching relates to method and system for charging a rechargeable battery deployed in an electric apparatus. The system resides in the electric apparatus. The system comprises a motor, an inverter, an output rectifier, a configurator, and a controller. The motor comprises a stator having a plurality of stator teeth and a plurality of stator windings wounded on the plurality of stator teeth. The inverter comprises a plurality of power switch devices. The configurator comprises a plurality of contactors coupled with the plurality of stator windings and the plurality of power switch devices. The controller controls the plurality of power switch devices and the plurality of contactors, so as to configure the system to operate in one of a traction mode and a charging mode.

The invention discloses an optimal control method for a single-phase high-frequency chain AC-DC non-electrolytic capacitor converter, and belongs to the technical field of power electronics. In order to realize power factor correction and soft switching without a closed-loop control circuit, the circuit comprises a converter and a controller, and the converter and the controller are connected through a signal; the controller collects a signal of the converter as a feedback signal, and generates a driving pulse signal of the converter in an SPWM mode. A phase shift control method and a dead zone self-adaptive control method are adopted to control a first series switch tube, a second series switch tube, a third series switch tube and a fourth series switch tube in a primary side matrix converter and a secondary side first switch tube and a secondary side second switch tube of a secondary side rectifier; and the frequency and the pulse width of the secondary-side third switch tube and the secondary-side fourth switch tube are optimally controlled. The driving pulse signal of the pre-stage matrix converter is generated, a direct-current link energy storage capacitor of a traditional two-stage rectifying circuit is eliminated, the size is reduced, and the hardware cost is saved.

The invention discloses an asymmetric non-isolated buck converter, a single-phase to two-phase converter and a single-phase to three-phase converter, and belongs to the technical field of converters, the asymmetric non-isolated buck converter comprises a cascaded buck unit and a non-isolated unit, the buck unit comprises one or more cascaded buck modules, each buck module comprises a first rectifier, and the output end of the first rectifier is vacant; the non-isolation unit comprises one or more cascaded non-isolation conversion modules. According to the invention, a traditional transformer structure with large volume and heavy weight is completely cancelled, and the number of devices is reduced while the power density of the converter is improved; and voltage reduction is carried out through the no-load voltage reduction unit, so that the voltage reduction capability is higher, and the input and output phase shift angle range can be expanded to a certain extent.

The invention relates to an arrangement for supplying electrical energy to a direct liquid cooling (DLC) system, wherein the arrangement comprises at least one IT rack (1) with a plurality of vertically arranged (z) slots (2) for plug-in devices (2.1) of a direct liquid cooling (DLC) system and / or an IT infrastructure, characterized in that the IT rack (1) has a DC power supply (3) for plug-in devices (2.1) received in the slots (2), with a rectifier (PSU) and a busbar (5) which runs along a rear side (R) of the IT rack (1) in the vertical direction (z) of the IT rack (1) and is supplied with a DC voltage by the rectifier (PSU), wherein at least one plug-in device (2.1) of a direct liquid cooling (DLC) system is received in one of the slots (2) and is electrically contacted with the busbar (5).

An electric machine is provided. A transformer comprises a magnetic coupling. A wound field synchronous machine comprises a rotor winding, a secondary circuit of the transformer electrically connected to the rotor winding, and a stator winding. The secondary circuit comprises a secondary winding, a rectifier electrically, a switch for switching voltage between the rotor winding and the rectifier in a first direction, and an energy storage arranged to store energy provided by the rectifier and the rotor winding and provide a voltage to the rotor winding in a second direction. A power converter is coupled between the power supply and the wound field synchronous machine. The power converter comprises a stator winding power supply arranged to provide multiple phase AC excitation to the stator winding and a primary circuit of the transformer comprising a primary winding arranged to provide AC power to the primary winding.

The invention relates to a method for determining the rotor current of a separately excited synchronous machine (FSM), comprising a stator and a rotor with an excitation winding. Initially, an excitation supply voltage is connected via a controlled bridge circuit to terminals A and B of an inductive transformer. On the secondary side, this transformer is connected to the excitation winding of the FSM via a rectifier. The controlled bridge circuit can be regulated via switching parameters using a control unit. Subsequently, the primary current of the excitation winding of the FSM is sampled at terminals A and B. Then, an evaluation time for the sampled primary current is determined, and the primary current is evaluated at that time. The evaluated primary current is then converted to the rotor current. Finally, the rotor current at the evaluation time is output.

The invention provides an impedance scanning device based on network side voltage dynamic compensation under a three-phase voltage imbalance working condition, and relates to the technical field of new energy station power electronic converter topology and control, the device comprises a three-phase rectifier, a direct current bus capacitor, an inverter, a voltage compensation device, a frequency sweeping device, a circuit breaker and a series transformer part, the three-phase rectifier is connected in series with inverters of the voltage compensation device and the frequency sweep device, a secondary side of a series transformer of the voltage compensation device is connected in series with a network side, a secondary side of a series transformer of the frequency sweep device is connected in series with a grid-connected point, and a primary side of the series transformer is connected to the inverters and is coupled to a secondary side of the series transformer; according to the device, the power grid side voltage is rectified through the voltage compensation unit and is compensated to the grid side after being subjected to single-stage inversion transformation, voltage compensation is achieved through the energy of a power grid when the voltage is unbalanced, and an external energy source or an interference source does not need to be introduced. After compensation, the accuracy of the frequency sweeping result is obviously improved.

To produce gas efficiently when electrolysis is performed using variable power to produce gas.SOLUTION: An electrolytic apparatus 10 according to the present disclosure comprises a plurality of electrolytic baths 11-1 to 11-n containing a liquid that decomposes and produces a gas when an electric current is supplied, a plurality of rectifiers 12-1 to 12-n installed in each of the plurality of electrolytic baths 11-1 to 11-n and supplying a current to each of the plurality of electrolytic baths 11-1 to 11-n, and a control unit 16 that controls the distribution amount of the current supplied by the plurality of rectifiers 12-1 to 12-n to the plurality of electrolytic baths 11-1 to 11-n. The control unit 16 obtains a power command that directs the power to be supplied to the entire plurality of electrolytic baths 11-1 to 11-n, and controls the amount of current distribution so that the total amount of gas produced by the plurality of electrolytic baths 11-1 to 11-n is maximized based on the power command.SELECTED DRAWING: Figure 1

The invention discloses an intelligent charging pile core module based on a VIENNA structure, an electric energy quality management method, system and equipment and a storage medium, and belongs to the field of electric power system energy storage equipment.The intelligent charging pile core module based on the VIENNA structure comprises the steps that an integrated power conversion unit is constructed, the power conversion unit adopts a VIENNA rectifier topology, three-phase alternating current is converted into direct current, and the direct current is converted into direct current; a harmonic suppression structure linked with the control interface is arranged; state information in the operation process is collected and serves as input of the control strategy module; based on the state information, a modulation control instruction is generated in the control strategy module to drive the switching action of the power conversion unit; on the basis of the modulation control instruction, the switch control is executed, meanwhile, the direct-current side midpoint potential of the power conversion unit is synchronously adjusted, and the distribution of direct-current bus capacitor voltage is controlled; and identifying the current operation condition according to the state information, switching to a control template corresponding to the operation condition in the control strategy module, and generating a modulation control instruction.

A power converter topology, comprising: a cascade connection of a first converter stage and a second converter stage; wherein the first converter stage comprises a current mode controlled pulse width modulation (PWM) converter having one or more pairs of switches forming a first switching bridge and an inductor connected to the output of the first switching bridge, the switching bridge generating a voltage Vlink; and wherein the second converter stage is a resonant converter having a switching stage having one or more pairs of switches forming a second switching bridge across the voltage Vlink generated by the first converter stage and a resonant tank connected to the output of the second switching bridge, to generate a resonator output voltage; the topology further comprising a transformer to transform the resonator output voltage to a transformed output voltage and a rectifier to rectify the transformed output voltage to an output voltage Vout, and wherein the duty cycle of the first switching bridge is varied according to a voltage derived from the value of the output voltage Vout, and wherein the duty cycle of the second switching bridge is fixed at 50:50.

The invention discloses a rapid switching emergency protection system for an aero-engine test, and the system comprises a rapid switching unit which is used for rapidly disconnecting a DC load according to a switching instruction transmitted by a controller, and switching the DC load to an emergency protection load; the measuring unit is used for measuring signals such as engine gas turbine rotating speed, free turbine rotating speed, alternating-current voltage and current, direct-current voltage and current and the like; the controller is used for carrying out fault judgment on the system according to the measurement data acquired by the measurement unit and correspondingly sending a switching instruction to the rapid switching unit when a fault occurs; the monitoring system is used for monitoring and displaying parameters and operation states of the rectifier, the bus and the direct-current load system; and the emergency protection load is in circuit connection with the rapid switching unit and is used for providing the emergency protection load when the hybrid power system is in a large state and the load is suddenly lost. According to the invention, overspeed protection of a turboshaft engine hybrid power system test is realized, so that accidents such as breakage and flying-out of turbine blades are avoided.

Provided is a water electrolysis system that alters power consumption by sensing a system frequency to rapidly change power consumption, wherein a suitable adjustment margin that can be accommodated instantaneously by an electrolytic cell is calculated so as to suppress deterioration or failure of the electrolytic cell. This water electrolysis system is configured by including: a rectifier that converts alternating-current power of a power system to direct-current power; an electrolysis tank that performs water electrolysis using the direct-current power from the rectifier; a gas–liquid separator that performs gas–liquid separation of oxygen and hydrogen from a fluid that is a mixture of oxygen and water from the electrolytic cell; and a cooling system that supplies water to the electrolytic cell. The water electrolysis system is characterized in that: the rectifier is controlled so as to adjust power consumption in accordance with the frequency of the power system; the power consumption is adjusted so that the power consumption in the electrolytic cell is within a limited range for power consumption; and the limited range for power consumption is determined on the basis of the temperature and deterioration rate of the electrolytic cell, the pressure of water at an exit of the electrolytic cell, and the flow rate of the supplied water.

The invention provides a three-phase single-stage isolation rectifier and a power factor correction method thereof, and belongs to the technical field of switching power supplies. The three-phase single-stage isolation rectifier comprises a low-pass filtering unit, a sector selection unit, a DC / DC high-frequency conversion unit and a compensation conversion unit, wherein the low-pass filtering unit is connected with a three-phase alternating current, and the DC / DC high-frequency conversion unit is connected with a direct-current load; the sector selection unit comprises a first bridge circuit and a switching circuit, the compensation conversion unit comprises a power frequency switching unit and a high-frequency converter, the first input end of the power frequency switching unit is connected with a first terminal P, the second input end of the power frequency switching unit is connected with a third terminal Y, the third input end of the power frequency switching unit is connected with a second terminal N, and the second input end of the power frequency switching unit is connected with a third terminal Y; the output end of the power frequency switching unit is connected with the output end of the high-frequency converter, the first input end of the high-frequency converter is connected with the first terminal P, and the second input end of the high-frequency converter is connected with the second terminal N. The conversion efficiency of the isolation rectifier can be improved.

The invention discloses an oscillation suppression method, an inverter controller and an oscillation suppression system, and relates to the technical field of new energy. The oscillation suppression method comprises the following steps: acquiring a first active power value and a first reactive power value of a first inverter; determining an output voltage phase angle and a target induced electromotive force amplitude of the first inverter according to the first active power value and the first reactive power value; determining a d-axis voltage reference value and a q-axis voltage reference value of the first inverter according to the output voltage phase angle and the target induced electromotive force amplitude; and according to the d-axis voltage reference value and the q-axis voltage reference value, performing voltage and current double-loop control to obtain a target pulse width modulation signal. According to the embodiment of the invention, the method can offset the negative damping of the oscillation suppression system and suppress the low-frequency oscillation of the oscillation suppression system on the premise that the network-side impedance and the control parameters of the matched rectifier are not accurately obtained.

The present disclosure discloses a medium-voltage input DC power supply system, comprising a phase-shifting transformer including a plurality of secondary windings; at least one power conversion unit, each including at least one power conversion module, and each power conversion module including: a rectifier unit having an input terminal connected to one of the plurality of secondary windings; at least one DC conversion unit connected to an output terminal of the rectifier unit, each DC conversion unit comprising: a first power conversion circuit, which is a single-stage DC conversion circuit; and a second power conversion circuit connected in parallel to an input terminal of the first power conversion circuit to suppress current oscillation at the input terminal of the first power conversion circuit; wherein each of the secondary windings is connected to one corresponding power conversion unit.

A power converter incorporating a synchronous rectifier implements adaptive gate voltage regulation for fast turn-off of the synchronous rectifier. In some embodiments, the adaptive gate voltage regulation circuit and method monitors the slope of the synchronous rectifier current during the on period of the synchronous rectifier. In response to detecting the synchronous rectifier current decreasing rapidly, a larger gate discharge current is applied to quickly discharge the synchronous rectifier gate voltage. In response to detecting the synchronous rectifier current decreasing more moderately, a smaller gate discharge current is applied to discharge the synchronous rectifier gate voltage in a moderate manner. When the synchronous rectifier can be turned off quickly, large reverse current and large drain voltage spike at the synchronous rectifier is avoided. The adaptive gate voltage regulation circuit and method is particularly useful when the power converter is operated in the discontinuous conduction mode.

Systems, method, and computer readable medium are provided for a controller for a generator. The system includes a rectifier for converting a first AC signal generated by the generator to a first DC signal; a first DC-DC associated with energy storage and a first mode; a second DC-DC associated with an inverter and a second mode; a switch for alternately toggling between the first DC-DC and the second DC-DC, wherein the first mode prevents output to the electrical grid, and the second mode enables inversion of the second DC signal to a second AC signal via the inverter; and a processor that uses the indicator to operate the switch to operate the generator in the first mode when a connection to the grid does not conform with a parameter, and operate the generator in the second mode when the connection to the grid conforms with the parameter.

A system includes: an alternating current (AC) to direct current (DC) converter (AC-DC converter) including a bulk capacitor, the AC-DC converter connectable to a line voltage; a DC to DC converter (DC-DC converter) connected to the AC-DC converter, the DC-DC converter including: one or more transformers having a secondary side connectable to a battery, and a bridge rectifier connected to the secondary side of the one or more transformers, the bridge rectifier including a bridge rectifier switch; and one or more controllers configured to control an operation of the bridge rectifier switch to control a voltage of the bulk capacitor.

The invention provides a single-phase four-quadrant rectifier IGBT open-circuit fault diagnosis method under multiple working conditions, and relates to the technical field of IGBT fault diagnosis. Historical data of alternating current side voltage, alternating current side current and direct current side voltage of the single-phase four-quadrant rectifier are obtained, and a total harmonic distortion rate threshold value, a direct current side voltage threshold value and an alternating current side current first threshold value are obtained. And constructing and training an IGBT open-circuit fault positioning identification model. Detecting the total harmonic distortion rate of the alternating-current side current of the single-phase four-quadrant rectifier in real time, if the total harmonic distortion rate exceeds a threshold value, entering fault positioning, collecting and calculating the average value of the direct-current side voltage and the alternating-current side current in the period, and judging the fault of the single-phase four-quadrant rectifier under the specific working condition according to the comparison of the average value and the threshold value. Or using an IGBT open-circuit fault positioning identification model to diagnose the fault; if the threshold value is not exceeded, the next period is continuously monitored. According to the invention, the IGBT fault diagnosis efficiency and accuracy of the single-phase four-quadrant rectifier are improved.

A system comprises: a high voltage (HV) direct current (DC) to DC converter (HVDC) including: one or more transformers; a bridge driver connected to a primary side of the one or more transformers; and one or more bridge rectifiers connected to a secondary side of the one or more transformers, the one or more bridge rectifiers including one or more bridge rectifier switches; a low voltage (LV) DC to DC converter (LVDC) connected to the HVDC; and a boost converter including: an inductor connected to the one or more bridge rectifier switches; and one or more boost configuration switches operable, in combination with the one or more bridge rectifier switches, to configure the boost converter into each of a bypass configuration and a boost configuration, to regulate a voltage at the LVDC.

The invention discloses a single-phase voltage-multiplying interleaving power correction circuit. The correction circuit comprises an alternating current power supply Ug, an inductor L1, an inductor L2, diodes D1 to D8, switching tubes S1 to S2, a capacitor C1, a capacitor C2, a capacitor C3 and a load RL, and the switched capacitor C3, the capacitor C1, the diode D7 and the diode D8 are respectively connected to form a switched capacitor circuit so as to form a voltage-multiplying structure. The advantages of the single-phase interleaving parallel technology and the voltage doubling rectifying circuit are combined, the multiple power converter units operate in an interleaving parallel mode, and voltage multiplication is achieved through the voltage doubling rectifying circuit. Compared with a traditional rectifier, the technology can effectively reduce the voltage stress of a power device, the input current THD and the size of an EMI filter through staggered parallel operation of a plurality of power converter units, thereby improving the overall performance and reliability of a system. Meanwhile, the voltage doubling rectifying circuit can be designed and adjusted according to requirements so as to adapt to different input and output voltage requirements.

A marine AC generator system includes a marine generator driven by an internal combustion engine and configured to generate an AC current and a rectifier configured to rectify the AC current to provide a DC current. At least one battery is configured to receive and be charged by the DC current. A battery powered inverter is configured to be powered by the at least one battery and to generate a variable current output frequency such that an AC electrical power is provided to a load when the marine generator is not running.

A power supply system (5) for a plurality of electrolyzers (2, 3, 4) is proposed. The power supply system (5) comprises: - main input terminals (6) intended to be connected to a grid (G), - an AC / AC power converter (7), - a control circuit (10), - a plurality of supply branches (12, 13, 14), - each supply branch (12, 13, 14) comprising a branch transformer (21, 22, 23) including a primary circuit connected to input terminals (15, 16, 17) of the said supply branch and at least one secondary circuit, and at least one rectifier (24, 25, 26) connected to the secondary circuit of the branch transformer, the rectifier comprising output terminals (30, 31, 32) connected to a set of output terminals (18, 19, 20) of the said supply branch to supply the output terminals of the said supply branch with a DC current.

The invention discloses a hybrid direct current transmission power coordination control device and a control method and equipment thereof, and relates to the technical field of offshore power generation, and the hybrid direct current transmission power coordination control device comprises a diode rectifier unit and a first modular multilevel converter which are connected with an offshore wind plant, the sending-end converter station is used for converting alternating current generated by an offshore wind plant into direct current and outputting the direct current; the second modularized multi-level current converter is connected with the diode rectifier unit and the land power grid and is used for restoring the direct current into the alternating current and transmitting the alternating current to the land power grid; and the control module is connected with the first modular multilevel converter and is used for controlling the DC voltage of the first modular multilevel converter based on the fluctuation power according to the transfer relation between the active power and the DC voltage of the sending end converter station, so that the higher requirement of the rated capacity of the MMC in the related technology is met, and the reliability of the MMC is improved. And the engineering construction cost is increased.

The application discloses a kind of water electrolysis hydrogen production rectifier transformer harmonic active inhibition optimization method, comprising the following steps: constructing rectifier circuit, rectifier circuit includes switch tube, the voltage vector and zero vector of switch tube output are combined, and combined output voltage vector is obtained;The harmonic amplitude is obtained by processing combined output voltage vector, Levy tangent flight strategy and confidence domain variation strategy are introduced in black-winged kite optimization algorithm to construct improved dynamic search algorithm, the total harmonic distortion is obtained by iterative calculation of harmonic amplitude by improved dynamic search algorithm, i.e. optimal switch tube combination, the switch tube of rectifier circuit is adjusted by optimal switch tube combination, and the total harmonic distortion of rectifier circuit is reduced.The optimal switch tube combination of rectifier circuit is iteratively calculated by improved dynamic search algorithm in the application, effectively reduces resource consumption, and processing speed is accelerated, and the efficiency and accuracy of electrolytic water hydrogen production rectifier are improved.

An electric vehicle charging system comprising a Direct Current (DC) distributor, a site controller, one or more alternating current (AC) / DC rectifiers connected to the DC distributor and the site controller, and an electric vehicle charger having one or more DC / DC converters connected to the DC distributor and a charge controller in communication with the site controller and each of the one or more DC / DC converters. The one or more AC / DC rectifiers are decoupled from the one or more DC / DC converters.

The invention discloses a finite set model prediction direct power control method for a single-phase three-level rectifier. The method comprises the following steps: carrying out SOGI conversion on alternating current side voltage and current of the single-phase three-level rectifier and output voltage of the rectifier to respectively obtain two-phase orthogonal rotating vectors; calculating to obtain active power and reactive power according to the rotation vector; performing finite control set model prediction control through the calculated active power and reactive power and the rotating vector output by the SOGI, circularly traversing the switching state vector, and predicting the active power and reactive power rate at the next moment and the voltage difference between the upper capacitor and the lower capacitor at the direct current side; and finding out an optimal switching state through cost function calculation to control the three-level rectifier. According to the invention, faster dynamic response can be realized, and the method is especially suitable for a system with transient load disturbance; the FCS-MPC is easy to add system constraints, so that the robustness to power grid fluctuation and load fluctuation is higher; and the influence caused by uncertain factors such as external interference and model errors is reduced.