450results about "Conversion without intermediate conversion to dc" patented technology

The invention discloses a parallel discharge circuit and an electric flame stove. The parallel discharge circuit comprises a transformer and at least two groups of discharge branches, and the two groups of discharge branches comprise a first discharge branch and a second discharge branch. The scheme that a single transformer replaces multiple transformers is adopted, multi-time conversion loss of electric energy-magnetic energy-electric energy is reduced, electromagnetic interference is reduced, meanwhile, a stove body does not need to be provided with a large number of transformers, the size is more compact, and the parallel connection requirement of hundreds of discharging devices of the high-power electric flame stove is met; according to the invention, continuous control of asynchronous breakdown and independent charging and discharging of multiple discharging branches is realized, the method is adaptive to the breakdown threshold value difference of discharging devices among the discharging branches and the charging speed deviation of voltage-multiplying capacitors, extra voltage-sharing control is not needed, and it is ensured that all the discharging branches can stably complete charging and discharging closed loop, discharging failure is avoided, and mutual interference is avoided; the wide-voltage input circuit is suitable for various voltage inputs, and wide-voltage input is achieved.

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.

An AC-AC converter is provided. The AC-AC converter includes a primary circuit, a secondary circuit, a transformer, a resonant tank, and a controller. The primary circuit includes four bidirectional switches, each including upper and lower switches connected back-to-back and capable of operating in four quadrants in a voltage-current plane. The first and fourth bidirectional switches operate synchronously, and the second and third bidirectional switches operate synchronously. When the input voltage is greater than a predefined threshold voltage, the first and second lower switches are maintained in an on state, and the first and second upper switches operate with PWM signals and are complementary to each other. When the input voltage is smaller than an additive inverse of the predefined threshold voltage, the first and second upper switches are maintained in the on state, and the first and second lower switches operate with PWM signals and are complementary to each other.

A capacitance electricity-taking circuit for a primary and secondary fusion pole-mounted circuit breaker comprises a first electricity-taking capacitor and a second electricity-taking capacitor which are connected in series, and a transformer which is connected with the second electricity-taking capacitor in parallel through a high-voltage side, and the low-voltage side of the transformer is connected with an output end. The first end, connected with the first electricity taking capacitor, of the second electricity taking capacitor is grounded and connected with a current discharging access, a discharging tube is arranged on the current discharging access, the control end of the discharging tube is connected with a discharging control circuit, and the discharging control circuit comprises a first protection diode. The second end of the second electricity taking capacitor is connected with the negative electrode of the first protection diode, and the positive electrode of the first protection diode is connected with the control end of the bleeder tube. According to the utility model, grounding protection and overvoltage protection of the input end can be realized at the same time by using the current discharge path, synchronous protection when the input end is abnormal can be realized by using the no-load protection circuit of the output end, and multiple protection functions are realized through circuit multiplexing.

A high-efficiency power electronic voltage regulating device with a reclosing function is connected in series with a low-voltage line and comprises a silicon controlled bypass switch, a series power unit, a parallel power unit, an input filtering unit, an output filtering unit, a controller, a topology change-over switch, a mechanical bypass switch, an input switch, an output switch and the like. Under a normal working condition, power is supplied to a user through the silicon controlled bypass switch; through an AI pre-judgment technology, a power grid voltage drop or increase trend is pre-judged, and a series power unit is conducted in advance; a topology change-over switch is connected to form a boost or buck topology, and when the voltage of a power grid is too low or too high, the normal voltage of a user is ensured through PR closed-loop control; when the rear-end line / load breaks down, reclosing control is carried out; and voltage upper and lower limits are adjusted remotely. The device utilizes the AI pre-judgment technology, has the characteristics of stable voltage, no need of input / output commutation and the like, solves the problems of over-high and over-low voltage and automatic reclosing in fault, and improves the high power supply quality and the power supply reliability of users.

The disclosed family of electrical power converters consists of two multiphase semiconductor conversion stages to accomplish variable voltage and variable frequency (VVVF) AC-AC power conversion. A middle filter network is positioned between the two conversion stages to absorb high-frequency harmonic currents produced by converter switching and to provide a freewheel path for inductive output currents. Additionally, an input filter network is placed at the input terminals of the first conversion stage to minimize input current distortion, while an output filter network is located at the output terminals of the second conversion stage to suppress high-frequency harmonics in the output currents. Moreover, the disclosed converter family is generalized for N-phase to M-phase power conversion, where N≥3 and M≥3.

The invention discloses a medium-voltage voltage regulating circuit, system and method, and belongs to the technical field of medium-voltage power distribution. The medium-voltage voltage regulating circuit comprises a tapped voltage regulating transformer Tr1, a voltage compensation unit, a current compensation unit and a direct-current supporting unit, the self-coupling winding of the Tr1 and the series transformer of the voltage compensation unit are connected in series to a medium-voltage main circuit, the parallel winding of the current compensation unit and the self-coupling winding of the Tr1 share a magnetic core and take the self-coupling winding of the Tr1 as a primary side and a secondary side, and the direct current sides of the power module of the voltage compensation unit and the power module of the current compensation unit are both connected to the direct current supporting unit. Wide-range voltage coarse adjustment is achieved through the Tr1, stepless voltage fine adjustment is achieved through the voltage compensation unit, meanwhile, the topological structure is simplified through the common magnetic core coupling design of the self-coupling winding and the parallel winding of the Tr1, the equipment size, the magnetic loss and the manufacturing cost are reduced, and the stability and reliability of a medium-voltage power distribution system are remarkably improved.

A solid-state transformer (1) is specified, comprising - at least two modules (2) having a first side (3) and a second side (4), wherein each module (2) comprises - at least two sub-modules (22), each comprising a first converter (5) at the first side (3) and a second converter (6) at the second side (4), wherein - the first converter (5) is connected to the second converter (6) by a transformer, and - the at least two sub-modules (22) are connected in parallel at the first side (3), and wherein - the at least two modules (2) are connected in series at the first side (3). Furthermore, a system is specified.

The present application discloses a power supply tie transformer, and a regulation and control method therefor. The power supply tie transformer comprises: a multi-phase parallel transformer, a multi-phase series transformer, and a plurality of safety protection auxiliary adjusting devices. Head terminals of the primary side of the multi-phase parallel transformer are all connected to a first line; the secondary side of the parallel transformer is provided with at least one power supply winding and a plurality of asymmetric windings; the power supply winding is connected to a power supply end; the plurality of asymmetric windings are respectively interconnected to the adjacent phase asymmetric windings of the secondary side of the parallel transformer by means of switch bridge arm modules respectively corresponding to the plurality of asymmetric windings to obtain a first electrical quantity; the first electrical quantity is coupled to the primary side of the series transformer by means of the secondary side of the corresponding series transformer; the plurality of safety protection auxiliary adjusting devices are connected in series between the first line and a second line. The present application realizes transmission of electric energy of a first line and a second line to a power supply end, ties the first line and the second line, and realizes mutual electric energy transmission at specified power between the first line and the second line.

The present disclosure relates to a three-phase transformer comprising a primary winding and a secondary winding for each phase of the three-phase transformer, at least one additional winding per phase, wherein each additional winding is connected to a power electronics tap changer, PETC, having respective outputs, wherein each additional winding comprises a first connection point and a second connection point, and wherein the first connection point and the second connection point are associated with different phases. The additional windings are provided on a secondary side of the transformer. The secondary windings are connected as a delta connection and the additional windings are connected as a star connection or the secondary windings are connected as a star connection and the additional windings are connected as a delta connection.

The invention discloses a power supply circuit, a control method and electric equipment. The power supply circuit comprises a transformer, the cathode of a primary coil of the transformer is connected with a zero line of a power grid, a first tap is led out from the anode, and a second tap is led out between the first tap and the cathode of the primary coil; the first end of the change-over switch is connected with the live wire of the power grid, the second end is connected with the first tap, the third end is connected with the second tap, and the change-over switch is used for switching the taps connected to the live wire and further changing the number of turns of the primary coil; the detection circuit is used for generating a detection signal according to the output voltage of the transformer; and the main chip is used for judging whether the number of turns of the primary coil of the transformer is matched with the output voltage of the power grid according to the detection signal, and controlling the change-over switch to switch the tap connected to the live wire according to the judgment result. According to the invention, the voltage output by the transformer can be kept at the preset voltage, the input voltage of the electric equipment conforms to the specification of the power supply, and the electric equipment can work normally under any power grid voltage.

The invention discloses a generator set system (10), a control method, an electronic device and a storage medium. The generator set system (10) comprises a new energy station (100), an energy storage power station (200) and a voltage coupling device (300). The new energy station (100) is connected with a first side (301) of the voltage coupling device (300), the energy storage power station (200) is connected with a second side (302) of the voltage coupling device (300), and a third side (303) of the voltage coupling device (300) is connected to an alternating current bus. The zero-carbon-level generator set is realized, the topological form is simple, and the universality is high.

The present invention relates to an electric converter (1") comprising: (i) a plurality of primary windings (3-R, 3-S, 3-T); and (ii) a plurality of secondary windings (4-a...4-n, 5-a...5-n, 6-a...6-n) magnetically linked to said plurality of primary windings (3-R, 3-S, 3-T); and a plurality of groups of reconfigurable connection modules connected to three terminals (R', S', T) of said electric converter (1"), said plurality of groups of reconfigurable connection modules are interconnected, wherein each group in said plurality of reconfigurable connection module groups comprising respective sets of reconfigurable connection modules electrically coupled to said sets of secondary windings; and in which each reconfigurable connection module includes a plurality of electronic switches configured to establish, in successive instants: a direct connection, a bypass connection, and a reverse connection wherein the voltage supplied to the input of the respective reconfigurable connection module is transferred to its output with inverted polarity.

The invention relates to the technical field of transformers, in particular to a transformer control device and method based on time periods, loads and faults. The device comprises a double-transformer unit, a monitoring unit, a control unit and an execution unit. The monitoring unit monitors the voltage, the current and the temperature of the double transformers, and the control unit controls the execution unit to realize switching-on and switching-off control of the double transformers according to the monitoring data, so that efficient control of the transformers in different time periods, different load states and fault states and zero-interruption control of the transformers are realized. And the utilization efficiency of the transformer is improved.

System (200) for operating a load tap changer, wherein the system comprises: a plurality of strands (208, 210), at least one of which is caused to switch from a first tap (202) to a second tap (204) of the load tap changer upon receipt of a tap change signal, each strand having at least one mechanical switch (214, 216) and wherein an electrical connection is established between the first tap (202) or the second tap (204) and a supply terminal (212) of the load tap changer when at least one mechanical switch (214, 216) of at least one of the plurality of strands is opened; and a plurality of semiconductor switches (220, 222, 224, 226), wherein each semiconductor switch (220, 222, 224, 226) is arranged in parallel to the mechanical switches (214, 216) and, in the activated state, provides an electrical connection between the first tap (202) or the second tap (204) and a supply terminal (212) of the load tap changer; and a processing unit (228) configured to selectively activate and deactivate the mechanical switches (214, 216) and the semiconductor switches (220, 222, 224, 226) such that the electrical connection between the at least one tap (202, 204) and the supply terminal (212) is maintained during the transition of the at least one strand (208, 210) from the first tap (202) to the second tap (204) without causing a short circuit between the two taps (202, 204). the processing unit (228) is also configured to: Generating the step switching signal to move at least one strand (208, 210) from the first tap (202) to the second tap (204) when a condition for step switching is met; Generating activation signals for the semiconductor switches (220, 222, 224, 226) when the stage switching signal is generated; and Generating a plurality of deactivation signals for the mechanical switches (214, 216) from at least one strand (208, 210) connected to the first tap (202) when a stage switching condition is met.

This invention discloses a method, apparatus, and electronic device for the coordinated control of multiple transformers. The method includes: acquiring multiple control cycles; controlling the multiple transformers within their respective control cycles according to the execution order of the multiple control cycles, until the multiple control cycles are completed: acquiring operating data corresponding to each of the multiple transformers; determining grid state parameters based on the multiple operating data; determining the operation probability distribution corresponding to each of the multiple transformers based on the grid state parameters; determining the target control operation corresponding to each of the multiple transformers based on the multiple operation probability distributions; and controlling the multiple transformers based on the multiple target control operations. This invention solves the technical problem in related technologies where the coordinated control of multiple transformers in a distribution network results in poor coordinated control performance, leading to unstable operation of the distribution network.

Disclosed are a step-down and phase-shifting transformer and an operational control method thereof. The step-down and phase-shifting transformer is connected to grids on at least two sides and at least includes a first winding, a second winding, and a third winding. The third winding is provided with a tap-position adjustment switch, the third winding is magnetically coupled to the first winding and the second winding, and the third winding is electrically connected to the first winding or the second winding, such that phase angle control and transmission power control between grids on different sides can be realized by adjusting the tap-position adjustment switch on the basis of voltage transformation.

This invention discloses a variable-wave arc welding power supply control method, arc welding equipment, control device, and storage medium. Applied to an arc welding equipment, the equipment includes a coordination control module and at least two power conversion modules. The coordination control module is connected to the controlled terminals of each power conversion module to control the switching of the power conversion modules to form and output pulse power. The output terminals of each power conversion module are connected in parallel to superimpose the electrical energy of the arc welding power supply. The variable-wave arc welding power supply control method includes: the coordination control module outputting its corresponding control commands to each power conversion module; and each power conversion module adjusting the pulse width and on / off timing of the pulse power according to the control commands to increase the power or voltage amplitude of the arc welding power supply. This design optimizes the output waveform of the welding power supply, enabling it to provide excellent dynamic characteristics and improve welding performance.

The invention discloses a compact single-stage matrix AC-DC power conversion device and a control method thereof. The power conversion device comprises a power module, a switch matrix, a resonant cavity, a rectifying circuit, a first follow current branch and a second follow current branch, the power module is connected with the switch matrix, the resonant cavity is connected with the power module, the switch matrix comprises a first bridge arm and a second bridge arm, the midpoint of the first bridge arm is connected with one end of a primary winding of the resonant cavity, and the midpoint of the second bridge arm is connected with the other end of a secondary winding of the resonant cavity. The midpoint of the second bridge arm is connected with the other end of the primary winding of the resonant cavity, the first freewheeling branch is connected with the first bridge arm in parallel, the second freewheeling branch is connected with the second bridge arm in parallel, and the first freewheeling branch, the second freewheeling branch, at least part of the first bridge arm, at least part of the second bridge arm, the power module and the resonant cavity form a freewheeling channel. Two ends of the rectification circuit are connected with the secondary winding of the resonant cavity. The compact single-stage matrix type AC-DC power conversion device can effectively eliminate voltage spikes and reduce loss.

Methods for switching the power source supplying an alternating current (AC) electrical load from a first AC power supply to a second AC power supply comprising: (a) determining, during a time period, the zero voltage crossings of at the first and second AC power supplies; (b) estimating for a future time period, based on information obtained in said determining step (a), the times at which a series of future current zero-crossings of said AC load and at least the current zero-crossing of the second power supply; (c) based on said estimating step (b), determining whether during said future time period the time of said zero-crossing of said load current and the zero-crossing of the second power supply are within about 0.1 microseconds of each other; and (d) for a time period during which said zero crossings are estimated to be within 0.1 microseconds of each other, switching said load to said second power supply at said time at which said zero crossings are estimated to be within 0.1 microseconds of each other, wherein said switching: (i) uses a solid-state switching system and microprocessor-based control system for actuating said solid-state switching circuit; and (ii) accounts for any known actuation delay between the actuation signal from said microprocessor and the occurrence of said switching.

The invention provides a multi-stage switch topology voltage regulator. The multi-stage switch topology voltage regulator comprises a transformer module, a switch control module and a tap selection module, the transformer module is electrically connected with the switch control module and the tap selection module, and the transformer module, the switch control module and the tap selection module cooperate to realize uninterruptible power voltage regulation; the transformer module comprises one of an autotransformer and a compensation transformer; the tap selection module comprises one of a single one-out-of-N switch module and a double one-out-of-N switch module. The technical problems that a traditional voltage regulator is difficult to consider direction flexibility, precision, transformation ratio range and structural rationality at the same time on the basis of'uninterruptible power voltage regulation ', and the technical scheme is simplified are solved.

To provide a power reception device that executes high-efficient power adjustment control.SOLUTION: A power reception device 200 executes power supply control that repeats a first rectification mode M1 in which a first high-side switch and a second low-side switch are turned on and a first low-side switch and a second high-side switch are turned off by detecting energization of a first bridge circuit, and a second rectification mode M3 in which the first low-side switch and the second high-side switch are turned on and the first high-side switch and the second low-side switch are turned off by detecting energization of a second bridge circuit in switching control of a synchronous rectification circuit 240, and executes power adjustment control including a first commutation mode M2 in which the first high-side switch is turned off and the first low-side switch is turned on in the first rectification mode, and a second commutation mode M4 in which the second high-side switch is turned off and the second low-side switch is turned on in the second rectification mode.SELECTED DRAWING: Figure 1

The utility model discloses a special control operation power supply device for an underground high-voltage explosion-proof cabinet, which belongs to the technical field of electrical tests and comprises an inversion unit, a transformer and a frequency converter. The inversion unit comprises an inverter, a power switch and a rechargeable battery; the inverter comprises a resistor R1, a resistor R2, a triode Q1 and a triode Q2; one end of the resistor R1 is connected with the base electrode of the triode Q1, and the other end of the resistor R1 is connected with the collector electrode of the triode Q2 and the output end of the high-voltage winding of the transformer; one end of the resistor R2 is respectively connected with the collector of the triode Q1 and the input end of the high-voltage winding of the transformer, and the other end is connected with the base of the triode Q2; the emitters of the triode Q1 and the triode Q2 are connected with the power switch; the power switch is connected with the negative electrode of the rechargeable battery; the positive electrode of the rechargeable battery is connected with the high-voltage winding of the transformer; and a secondary winding of the transformer is connected with the frequency converter, so that the technical problem of inaccurate test data caused by a no-voltage protection mechanism during an underground electrical test in the prior art is solved.

The power converter circuit of the present application comprises a primary side circuit, a secondary side circuit, and a coupling network arranged between the primary side circuit and the secondary side circuit, the coupling network comprising a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor, the first inductor, the first capacitor and the second inductor are connected in series between a first output end of the primary side circuit and a first input end of the secondary side circuit, one end of the third capacitor is connected to a second output end of the primary side circuit, and the other end is connected to a second input end of the secondary side circuit, one end of the second capacitor is connected between the first inductor and the first capacitor, and the other end is connected to the second input end of the secondary side circuit.

The invention discloses a modular multilevel matrix converter layered architecture device and a control method thereof. The invention discloses a layered architecture device. Comprising a three-phase AC input system, a bridge arm circuit, a three-phase AC output system, a DSP controller circuit, an FPGA controller circuit, an isolation driving circuit, a protection circuit, a starting circuit, an input voltage and current sampling circuit, an output voltage and current sampling circuit, a bridge arm voltage sampling circuit, a bridge arm current sampling circuit, a sampling signal conditioning circuit and an observer. According to the invention, the observation of the capacitor voltage of the M3C bridge arm sub-module is realized by using the observer, the number of voltage sensors and sampling circuits is reduced, the reliability of the system is improved, and the hardware cost is reduced; the hierarchical control method enables the control program to be easy to modify, update and transplant, reduces the workload of developers, and improves the control real-time performance.

The disclosed family of electrical power converters consists of two multiphase semiconductor conversion stages to accomplish variable voltage and variable frequency (VVVF) AC-AC power conversion. A middle filter network is positioned between the two conversion stages to absorb high-frequency harmonic currents produced by converter switching and to provide a freewheel path for inductive output currents. Additionally, an input filter network is placed at the input terminals of the first conversion stage to minimize input current distortion, while an output filter network is located at the output terminals of the second conversion stage to suppress high-frequency harmonics in the output currents. Moreover, the disclosed converter family is generalized for N-phase to M-phase power conversion, where N≥3 and M≥3.

A distribution transformer for use in a providing electrical power to sites, includes a ferromagnetic core; a primary winding configured to be connected to a source grid at source grid voltage; and a secondary winding configured to be coupled to service cables to supply electrical energy to at least one of the sites at a first line voltage and at least another of the sites at a second line voltage, wherein the second line voltage is higher than the first line voltage.

An apparatus for a load tap changer includes a first primary winding electrically connected to a first contact, the first contact configured to connect to one of a plurality of taps in a load tap changer; a second contact, the second contact configured to connect to one of the plurality of taps in the load tap changer; a magnetic core; and a control circuit including: a secondary winding configured to magnetically couple to the first primary winding and the magnetic core; and an electrical network electrically connected to the secondary winding, the electrical network being configured to prevent magnetic saturation of the magnetic core during switching of the first or second contact.

The application discloses a kind of traction network impedance simulation system and control method based on voltage source converter, and main substation is simulated by three-phase transformer, and traction substation is simulated by single-phase transformer.Three-phase transformer steps down power supply voltage, and the voltage on the high-voltage side of the single-phase transformer of the traction substation group comes from the same two-phase voltage of the three-phase transformer, which supplies the traction network after stepping down the voltage. Among them, for the impedance simulation of the traction network, the movement of the train is equivalent to the change of the line impedance, and the VSC is used to simulate the impedance of the traction network. The VSC is used to realize the change of the impedance of the traction network on both sides of the train during the train operation. The VSC device is used to simulate the impedance of the traction network on both sides of the train during the train operation, and relevant researchers can use the invention to carry out experimental verification of the related theory of the new type of substation group bilateral traction power supply system, and promote the development of the new type of substation group bilateral traction power supply technology.