1296 results about "Rectiformer" patented technology

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.

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.

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 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.

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 provides an overvoltage transient suppression method and system for an automobile generator rectifier and a medium, and relates to the technical field of rectifiers, and the method comprises the steps: carrying out the dynamic continuous data collection of an automobile generator through a transient data collection device, and obtaining an output voltage waveform; a load rejection identification mechanism is introduced to identify and analyze the output voltage waveform, and a real-time load rejection event is obtained; triggering an active protection circuit based on the real-time load throwing event, and generating a real-time protection control decision; and performing transient suppression on the rectifier according to the real-time protection control decision. The technical problems that in the prior art, overvoltage protection of an automobile generator rectifier is slow in response speed and low in protection precision, and the overvoltage transient state cannot be effectively restrained are solved. The technical effects of accurately identifying and responding to the overvoltage event and improving the timeliness and effectiveness of overvoltage transient suppression of the automobile generator rectifier are achieved.

The embodiment of the invention provides an uninterruptible power supply, a control method of the uninterruptible power supply, related equipment and a system, and relates to the technical field of electric power. Comprising a bypass switch and a DC / AC inverter, and the bypass switch is used for responding to the first control signal to be switched on, so that an alternating current power supply provides active power for a load through the bypass switch; the DC / AC inverter is in an inversion state in response to the second control signal, obtains energy from the DC energy storage equipment, and provides active power of the first set power for the load, so that the active power provided by the AC power supply for the load is smaller than the second set power. According to the uninterruptible power supply provided by the scheme, a rectifier part in a traditional uninterruptible power supply framework is omitted, only the inverter and the static bypass are included, the size of the uninterruptible power supply is reduced, and the equipment cost is reduced. Meanwhile, the direct-current energy storage equipment and the alternating-current power supply simultaneously provide active power for the load after passing through the DC / AC inverter, and peak load shifting of the power of the power grid side is achieved.

The invention relates to the technical field of wireless charging, in particular to a wireless charging system and an application method, and the system comprises m inverters, m-1 RIITs and transmitting coils at a GA end, n first rectifiers at a VA end, RIITs corresponding to n-1 first rectifiers, q second rectifiers, RIITs corresponding to q second rectifiers and receiving coils. The output ends of the n first rectifiers are connected in parallel and are used for outputting electric energy to the high-voltage battery; and the output ends of the q second rectifiers are connected in parallel and are used for outputting electric energy to the low-voltage battery. The high-voltage battery and the low-voltage battery supply energy through the receiving coil at the VA end, the charging mode can be changed by setting the working state of the rectifier, and decoupling control over charging of the high-voltage battery and the low-voltage battery is achieved. According to the invention, the size and cost of the charging structure of the VA end can be effectively reduced, and different levels of power requirements can be met by adjusting the number of inverters and rectifiers.

The invention provides a PWM / Buck cascade circuit auxiliary electrolytic hydrogen production rectification power supply and a control method, and relates to the technical field of electrolytic hydrogen production power supply and intelligent power grids, and the power supply comprises a main power loop and an auxiliary power loop; the main power loop comprises a multi-pulse thyristor rectifier, the power supply side of the multi-pulse thyristor rectifier is connected with an alternating-current power grid, the load side of the multi-pulse thyristor rectifier is connected with one end of a direct-current smoothing reactor, and the other end of the direct-current smoothing reactor is connected with the electrolytic bath; the auxiliary power loop comprises a PWM rectifier and a Buck circuit which are connected in series, the output end of the Buck circuit is connected to the output end of the main power loop in parallel through a direct-current LC filter, the output end of the Buck circuit and the output end of the main power loop are jointly connected into an electrolytic bath for ripple compensation, the multi-pulse rectifier adopts PI control, the PWM rectifier adopts voltage and current double-closed-loop control and SVPWM modulation, Buck adopts PI and feedforward compound control, and the output end of the Buck circuit and the output end of the main power loop are connected in parallel. The system has the advantages of improving the grid-side electric energy quality, the voltage utilization rate, the water electrolysis hydrogen production efficiency and the operation stability.

A variable-frequency drive includes a rectifier, a filter, an inverter, a capacitor bank, and control circuitry. The rectifier converts AC power from a power source to DC power on a DC bus for filtering by the filter. The inverter converts the DC power to three-phase AC power for output to the electric motor. The capacitor bank has one or more capacitors connected to the DC bus. The capacitor bank can store regenerative power on the DC bus from the inverter and can supply the stored DC power to the DC bus for conversion to the three-phase AC power to drive the electric motor. The control circuitry pre-charges the capacitor bank from the AC power of the power source. The control circuitry monitors one or more parameters of the variable-frequency drive and detects one or more fault conditions associated with the one or more monitored parameters.

The invention discloses a flexible interconnection and mode smooth switching method for a distributed power generation system, and relates to the technical field of distributed power generation, and the method comprises the steps: building a droop control relation through continuously collecting DC voltage and current for a source side rectifier of each power generation unit; in a normal mode, the output current of the back-to-back rectifier and the voltage of an intermediate capacitor are collected, the same phase of the current and the load current is kept by using phase locking control, and voltage regulation is realized by combining a dq coordinate model; when a fault of a source side rectifier is detected, an alternating current reference value is generated based on intermediate capacitor voltage deviation and is input into a single current loop controller for voltage stabilization, and meanwhile, a phase advance, adaptive gain and integral saturation resistance mechanism is introduced, so that quick response and stable operation are ensured; in the mode switching process, normal control quantity and fault control quantity are subjected to weighted fusion, and dynamic consistency is achieved through pole matching and reference pre-alignment; the intermediate capacitor voltage fluctuation is significantly reduced, the recovery time is shortened, and the system stability and reliability are improved.

The utility model discloses a field inversion configuration power supply and system of a distributed rectifying device. The field inversion configuration power supply comprises an alternating current source, N resonance branches and an angular pinch coil, each resonance branch is provided with a distributed rectification circuit and a capacitor; the distributed rectifying circuit comprises a plurality of rectifiers which are connected in parallel; one end of the distributed rectifying circuit is connected with an alternating current source, and the other end of the distributed rectifying circuit is electrically connected to the angular pinch coil after being connected with the capacitor; according to the scheme, structural improvement is carried out on the basis of a traditional field inversion power supply technology, and a distributed rectification circuit comprising a plurality of rectifiers connected in parallel is arranged on each resonance branch; by adjusting the working time limit of each independent rectifier in the distributed rectifier circuit, the theta-pinch field inversion device can meet the complex frequency working requirement.

The utility model relates to a device for producing hydrogen by electrolyzing water, in particular to a device for producing hydrogen by electrolyzing water through iron-based circulation assistance. The utility model aims to solve the problems of large electrolytic solution resistance, high equipment complexity and pipeline blockage in the existing water electrolysis technology. The utility model discloses a device for iron-based circulation assisted water electrolysis hydrogen production. The device comprises an electrolyte tank, an ion exchanger, a circulating pump, a transformer, a rectifier, an electrolytic bath, a first compressor, a second compressor, a high-pressure storage tank, a gas storage tank, a plurality of dryers, a cathode, an anode and a proton exchange membrane. According to the utility model, the design of the carbon powder dispensing electrode is adopted to replace the suspension state of coal slurry, and meanwhile, the one-step electrolysis design and the efficient circulation auxiliary module are combined, so that the solution resistance and the equipment complexity are obviously reduced, and the problem of pipeline blockage is solved; the iron-based circulating auxiliary water electrolysis hydrogen production device is efficient, low in power consumption, stable and reliable, and is suitable for large-scale industrial popularization.

Examples described herein provide a circuit that includes a power electronics converter disposed in a vehicle, the power electronics converter to receive alternating current (AC) electrical power from an AC grid source and to provide AC electrical power to an AC load external to the vehicle. The power electronics converter includes an AC-AC converter that includes a rectifier and an inverter, the rectifier being electrically connected to the inverter by a direct current (DC) link. The circuit further includes an on-board charging module electrically connected to the power electronics converter and a battery disposed in the vehicle. The power electronics converter provides vehicle-to-load functionality by providing, to the AC load, AC electric power as an output of at least one of a 120 Vac output or a 240 Vac output.

The invention discloses a high-efficiency UPS (Uninterrupted Power Supply) management system for well logging, and belongs to the technical field of power management. The system comprises a rectifier, a charger, a storage battery pack, an inverter, a change-over switch and a management module. The management module comprises an on-line monitoring unit, a power supply controller and a driving circuit, and the on-line monitoring unit collects UPS power supply operation state parameters in real time; the power supply controller receives and processes the parameters, and generates a control instruction according to a preset threshold value; and the driving circuit converts the control instruction into a driving signal and accurately controls the working state of the inverter. Wherein a signal conditioning circuit is arranged between the sensor module and the data acquisition unit and can perform enhancement and noise reduction processing on an analog signal output by the sensor. The driving circuit effectively resists well logging environment interference through cooperative work of an instruction amplifier, a photoelectric coupler and a field effect transistor, stable operation of a UPS power supply system is guaranteed, accurate control over the working state of an inverter is achieved, and it is ensured that stable and reliable electric power supply is provided for well logging equipment.

To provide a wireless power supply system in which overvoltage protection can be realized at the power reception side without adopting a special circuitry configuration.SOLUTION: A power reception device 3 includes a rectifier 32 that converts received AC voltage to DC voltage and outputs the DC voltage to between a high-potential side line 41 and a low-potential side line 42, an input capacitor C1 that smooths the output of the rectifier 32, a DCDC converter 5 that receives the DC voltage smoothed by the input capacitor C1 as input voltage Vin, converts the input voltage Vin to desired output voltage Vout by controlling the on / off of at least two switching elements SW1, SW2, and outputs the output voltage to a load, and an overvoltage detection unit 51 that detects overvoltage of the input voltage Vin. When the overvoltage detection unit 51 detects overvoltage, the DCDC converter 5 executes overvoltage protection operation of forming a current path to allow protection current Ipro to flow therethrough between the high-potential side line 41 and the low-potential side line 42 by controlling the switching elements SW1, SW2 to be on.SELECTED DRAWING: Figure 1

Disclosed is a DC-DC converter including: a first switch and second switch or rectifier in series between a voltage input terminal and a ground potential point; an inductor between the first switch and the second switch or rectifier; a control circuit controlling on / off of the first switch or the first and second switches according to feedback voltage of voltage output through the inductor, in which a third switch is connected between the voltage input terminal and the first switch, at least one first bypass capacitor is connected to the voltage input terminal, and a second bypass capacitor is connected to a second connection node between the first and third switches; and an abnormality detection circuit detecting short circuit of the second bypass capacitor by monitoring current in the first switch or voltage at the second connection node. The third switch turns off when short circuit is detected.

The invention relates to a single-stage AC-DC converter and a control circuit. The single-stage AC-DC converter comprises a filter, an input rectifier, a filter capacitor Cin, a first switch bridge arm, a second switch bridge arm, a capacitor Cb, an inductor Lb, a resonant cavity formed by a resonant inductor Lr and a resonant capacitor Cr, a transformer T, an output rectifier and an output capacitor Co. According to the invention, a traditional two-stage AC-DC converter and a control circuit are simplified. Compared with a single-stage AC-DC converter in the prior art, the problem that the current of a resonant cavity is too large can be solved only by adding one inductor, meanwhile, the control strategy is simple, the frequency range conversion of a switching tube is small, and soft switching of the switching tube is easy to achieve, so that high efficiency is easy to obtain, input current can be corrected to achieve a high power factor, and the power factor is high. And the output voltage ripple is small, and the method has remarkable engineering application value and market prospect.

The invention belongs to the technical field of three-phase alternating current / direct current converters, and particularly relates to a SWISS rectifier control method and system for achieving phase compensation and reducing input current harmonics, and the method comprises the steps: obtaining power grid synchronization information through sampling three-phase power grid voltage in real time and carrying out phase locking and coordinate transformation; a d-axis current reference value is generated by adopting a single PI control loop, and a q-axis compensation current is calculated in combination with feedforward compensation based on filter capacitor parameters; an input current reference value is generated through reverse Park conversion and voltage sorting, and after the direct current side inductive current is subjected to power frequency period synchronous moving average filtering, the direct current side inductive current is directly compared with the current reference value to generate a PWM driving signal. The system only needs to collect direct-current side inductance and three-phase power grid voltage, and a grid-side current sensor is not needed. According to the invention, the control structure is simplified, the power factor is improved, and input current harmonics and hardware cost are reduced.

The invention relates to the technical field of liquid cooling electric control temperature adjustment, and discloses an air temperature adjustment system for a liquid cooling electric control room based on multi-mode switching. The system comprises a multi-source thermal state monitoring unit, a dynamic thermal coupling evaluation unit, a cooling requirement grading unit and a multi-mode decision-making unit. The multi-source thermal state monitoring unit collects the temperature of a liquid cooling loop of a frequency converter and a fracturing rectifier, the environment temperature of an electric control room and equipment operation power data in real time. The dynamic thermal coupling evaluation unit constructs a nonlinear heat conduction model based on the collected data, and evaluates the dynamic thermal coupling effect between the two devices; the cooling demand grading unit calculates the cooling demand grades of the two devices in combination with the thermal coupling evaluation result and a preset thermal load threshold value; and the multi-mode decision-making unit generates a combined forced cooling, combined natural cooling or mixed cooling mode decision through a ternary state judgment mechanism. The system can flexibly switch cooling modes, is adaptive to different thermal load states of equipment, and gives consideration to both the cooling effect and the energy efficiency.

A power conversion system for powering an electrolyser, comprising K primary rectifier bridges, J auxiliary rectifier bridges, and Z DC / DC converters, each connected to an auxiliary rectifier bridge, wherein a first DC link shared by the K primary rectifier bridges is series connected with Z second DC links of the Z DC / DC converters, thus forming an output of the power conversion system. Further, the power conversion system comprises a transformer with secondary windings connected to the K primary rectifiers and the J auxiliary rectifiers in various configurations.

A power supply system with power factor correction, includes: an AC rectifier, a power factor correction (PFC) conversion circuit, an asymmetric half-bridge (AHB) flyback converter and a communication protocol power delivery (PD) interface. When a power level of an adapter output power is lower than a power threshold, and a converted voltage of a converted power is higher than a first voltage threshold, the communication protocol PD interface generates a disable signal to disable a PFC conversion of the PFC conversion circuit, when the PFC conversion is disabled, the PFC conversion circuit operates a bypass coupling operation, as thus, the converted voltage is equal to a rectified voltage of a rectified power.

The invention relates to a system (10) for de-icing the blades (14) of the propeller (12) of an aircraft, the system comprising an H-bridge inverter device (40); a rotary transformer (22) comprising a main primary winding (26), a primary measurement winding (28), and a secondary circuit (30) delivering a secondary alternating voltage (Vs); a rectifier device (50); a de-icing device (20); a control device (60) configured to control the switching elements of the inverter device in an out-of-phase manner, using the value of the voltage (Vpm) across the terminals of the primary measurement winding, measured during a measurement interval of predetermined duration starting at the instant (t11,t33) when the inverter device switches from a controlled state to a short-circuit state.

The invention discloses a bidirectional single-stage alternating current-direct current converter, which belongs to the field of alternating current-direct current electric energy conversion and comprises a low-frequency rectifying circuit, a high-frequency resonant conversion circuit, a voltage-multiplying conversion circuit and a three-phase alternating current, and the low-frequency rectifying circuit, the high-frequency resonant conversion circuit and the voltage-multiplying conversion circuit are sequentially connected. A low-frequency side adopts a Swiss rectifier, a high-frequency side adopts a Sigma-LLC circuit and two groups of three-phase LLC parallel high-frequency resonant conversion circuits, and all devices adopt switching tubes to ensure bidirectional flow of power.

The invention provides a parameter design method for a multi-voltage rectification LCC converter, and the method comprises the steps: building a voltage precise mathematical model of a resonant cavity parallel capacitor through employing a fundamental wave equivalent method based on the condition that output capacitors of the multi-voltage rectification LCC converter and a multi-voltage rectifier participate in resonance; the gain of the voltage-multiplying LCC resonant converter is modeled through a voltage accurate mathematical model of a resonant cavity shunt capacitor; determining the number of rectifier bridges, the turn ratio of a transformer and the capacitance value of a rectification voltage-multiplying capacitor according to the voltage of the parallel capacitor of the resonant cavity and the gain of the voltage-multiplying LCC resonant converter; and determining values of the resonant cavity series-parallel capacitor and the resonant cavity inductor according to the capacitance value of the rectification voltage-multiplying capacitor. According to the method, analysis and calculation of the output filter capacitance are incorporated into parameter design of accurate modeling, a scheme for selecting the number of the voltage doubling rectifier bridges is given, and the size can be reduced and economic benefits can be increased under the condition that working condition requirements are met.

The utility model provides a millimeter wave isolation drive circuit and an electronic device. The drive circuit comprises a low-voltage side control module, a high-voltage side control module and a millimeter wave isolation module. The low-voltage side control module is connected with the high-voltage side control module through the millimeter wave isolation module; a power supply circuit is also included; the power supply circuit comprises an inverter, a transformer, a rectifier and a feedback adjustment module which are connected in sequence; primary coils of the inverter and the transformer are positioned on the low-voltage side; the input end of the inverter is connected with a low-voltage side power supply; a secondary coil of the transformer, the rectifier and the feedback adjustment module are located at a high-voltage side; the output end of the rectifier is also connected with the high-voltage side control module; the output end of the feedback adjustment module is connected with the low-voltage side control module through the millimeter wave isolation module; and the low-voltage side control module is also connected with the inverter. According to the utility model, the power supply design can be optimized, and the isolation performance can be improved.

A dryer is provided. The dryer includes an alternating current (AC) power supply configured to supply an input voltage, a rectifier configured to rectify the supplied input voltage, a power amplifier configured to amplify the rectified input voltage to provide an output voltage, a plurality of electrodes to which the output voltage is applied, a matching circuit, connected between the power amplifier and the plurality of electrodes, configured to correct a waveform of the output voltage provided from the power amplifier, memory storing instructions, and at least one processor, wherein the instructions, when executed by the at least one processor individually or collectively, cause the dryer to obtain a magnitude of the output voltage provided from the power amplifier, and detect a power value corresponding to the rectified input voltage, based on the magnitude of the output voltage provided from the power amplifier being less than or equal to a defined reference voltage.

The invention provides an uninterruptible power supply and a soft start method and device thereof, and a controller, in the uninterruptible power supply, an inverter circuit is provided with a three-phase output end, and two output ends of a pre-charging circuit are correspondingly and electrically connected with any two-phase output ends of the inverter circuit instead of being directly and electrically connected with a direct-current bus; when the uninterruptible power supply charges the bus capacitor through the pre-charging circuit, the bus capacitor can be charged through energy storage operation and follow current operation of the inverter circuit, so that the voltage of the bus capacitor is larger than the peak value of the mains supply, and when the mains supply relay is powered on, the voltage value of one end, electrically connected with the mains supply, of the mains supply relay is lower than the voltage of the bus capacitor. Due to the limitation of the conduction direction of the rectifying device in the rectifying circuit, impact current does not occur any more, the arc discharge phenomenon of a relay contact caused by the impact current is reduced, and the stability of the uninterruptible power supply in the power-on process is improved.