594results about "Conversion without intermediate conversion to dc" patented technology

The invention discloses a 10kV distribution transformer on-load voltage regulation control method and system, and relates to the technical field of transformer on-load voltage regulation, and the method comprises the steps: collecting the three-phase voltage and current of a low-voltage side of a distribution transformer and a tap switch gear signal, and loading a preset voltage regulation control mode and an oscillation region parameter; based on the acquired three-phase voltage and current of the low-voltage side of the distribution transformer and the tap switch gear signal, calculating a feeder comprehensive impedance parameter and a load reactive power parameter, and outputting a transformer operation state index; according to the transformer operation state index, the voltage regulation control mode and the oscillation area rule, current voltage out-of-limit and reactive power deviation are judged, and a voltage regulation strategy triggering instruction is generated according to the judgment result; and calculating upper and lower limit values of feed line correction voltage based on the voltage regulation strategy trigger instruction, and controlling the tap switch to execute voltage regulation action. According to the method, a combined calculation scheme of feeder comprehensive impedance and load reactive power is fused, and dynamic optimization of the triggering condition of the voltage regulation strategy is achieved.

The invention relates to the technical field of power electronics, and discloses a dielectric barrier discharge high-voltage series resonance system and a control method thereof. The system comprises a high-voltage series resonance circuit, an upper computer and a hardware circuit. The upper computer is electrically connected with the hardware circuit, and the hardware circuit is electrically connected with the high-voltage series resonance circuit; wherein the high-voltage series resonance circuit comprises a PFC circuit, a Buck circuit, an LC series resonance circuit, a high-voltage pulse transformer and a dielectric barrier discharge load which are connected in sequence, the high-voltage series resonance circuit converts alternating current into high-frequency high-voltage pulse voltage and provides the high-frequency high-voltage pulse voltage for the dielectric barrier discharge load, and stable dielectric barrier discharge is generated; the upper computer is used for setting parameters, the hardware circuit controls the on-off state of the Buck circuit and the LC series resonance circuit according to the parameters set by the upper computer, accurate generation and control of high-voltage pulse voltage in the dielectric barrier discharge process are achieved, and the response speed and the control precision of the system are also improved.

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.

The invention relates to the technical field of air purification, and discloses a negative oxygen ion generator and a method thereof.The negative oxygen ion generator comprises an external shell used for providing installation positions for related parts; the power supply input module is mounted in the external shell, is internally provided with a filtering unit, and is used for receiving external direct current; the direct current and alternating current inversion module is electrically connected with the output end of the power supply input module, is internally provided with a switch assembly and is used for converting the direct current into high-frequency alternating current; a primary winding, a secondary winding and a feedback winding are arranged in the boosting transformer. A boosting transformer is arranged between a direct current and alternating current inversion module and a high-voltage double-voltage rectification module, so that the voltage is effectively boosted, more importantly, the magnetic field coupling characteristics of a primary winding and a secondary winding are utilized, reliable electrical isolation is constructed, and a physical path from a high-voltage side circuit to a low-voltage side circuit is blocked.

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.

The invention provides a medium-voltage alternating-current voltage regulating device and a control method, and relates to the technical field of circuits, and the medium-voltage alternating-current voltage regulating device comprises a transformer, at least one power conversion module, a main controller and at least one bypass module. The power conversion module comprises a first inverter bridge arm, a second inverter bridge arm, a third inverter bridge arm, a first inductor, a second inductor, a third inductor and a capacitor bank. When the voltage of the medium-voltage power grid is too high or too low, the power conversion module automatically compensates the voltage of the power grid, so that the voltage is recovered to a normal range. The medium-voltage alternating-current voltage regulating device is large in regulating range, can effectively stabilize the power supply voltage of a medium-voltage power grid, has the effects of high response speed, low cost, high reliability and convenience in maintenance, and can effectively improve the power transmission capacity of the medium-voltage power distribution network.

The invention discloses a transient power flow type voltage out-of-limit treatment method, device and system, and belongs to the technical field of low-voltage and high-voltage out-of-limit treatment, and the technical scheme is characterized in that the method comprises the steps: obtaining a voltage signal and a current signal corresponding to a transformer at the current moment; according to the LSTM model, the voltage signal and the current signal, obtaining a voltage prediction value corresponding to the adjacent next moment; according to the voltage prediction value, executing iterative operation to obtain a first compensation gear; and obtaining the target compensation gear according to the first compensation gear and the Q learning algorithm. The voltage prediction value corresponding to the next moment is obtained through the LSTM model, the target compensation gear is determined in advance through the voltage prediction value and is adjusted, the voltage out-of-limit time is reduced, and when the target compensation gear is determined, iterative operation and the Q learning algorithm are combined, so that the compensation precision is improved. And the final target compensation gear can reduce the action times of the contactor on the premise of ensuring that the voltage is qualified.

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 invention relates to the technical field of electronic circuits, in particular to a differential transformer resonant bridge resonant frequency detection and adjustment device and method, a rapid tuning capacitor bridge is composed of a plurality of tuning capacitors, and the resonant frequency is changed by adjusting the capacitance values of the tuning capacitors connected into a circuit; in addition, an analog-to-digital conversion circuit is used for collecting voltage data, and the upper computer is used for directly observing the minimum value of an output voltage peak-to-peak value to judge the resonance state. According to the device and the method provided by the invention, the resonant frequency can be detected, the tuning range can be adjusted as required, the tuning capacitance stepping precision can be adjusted as required, the tuning precision is high, and the resonant frequency adjustment efficiency is improved; meanwhile, the rapid tuning capacitor bridge is used as an independent adjusting unit, so that repeated welding and dewelding of the front-end circuit during the tuning process when the tuning capacitor is changed are effectively avoided, the safety and the reliability of the front-end bridge are ensured, and the engineering application requirements are better met.

To provide a reactor which can easily adjust an inductance and a heat dissipation without increasing the size.SOLUTION: In a reactor, a coil of which the number of winding parts is one, and a magnetic core are provided, an outer peripheral surface of each winding part contains a part contacted to an installation object of the reactor, and the magnetic core includes an E-shape like first core part, a T-shaped like second core part, and a gap part. The first core part is constructed by a compact of a composite material, and the second core part is constructed by a dust compact. The gap part is arranged between a first middle core part of the first core part and a second middle core part of the second core part in an inner part of each winding part. A length from the second end surface of each winding part to the gap part is 0.2 times or more and 0.49 times or less of the length of each winding part. A total volume of a volume of the first core part, a volume of the second core part, and a volume of the gap part is 50 cm3 or more and 500 cm3 or less.SELECTED DRAWING: Figure 4

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.

The invention provides a bias protection and pulse width equalization control method and system for a vehicle power supply module, and relates to the technical field of module control, and the method comprises the steps: obtaining an input voltage and an output current signal, and calculating an instantaneous power value and an output power value; calculating the inductance value of the transformer to judge the magnetic biasing state; collecting a switch tube conduction current waveform, calculating a time difference value, generating a compensation parameter, and adjusting the actual conduction time; dividing the output power into a plurality of power intervals, setting duty ratio calculation parameters, and generating pulse width signals with different duty ratios to control a switching tube; and the output power value is monitored in real time to realize overload protection. The problem of magnetic bias of the transformer is solved, switching loss is reduced, and reliability of the power supply module is improved.

In some examples, a control system for regulating a three-phase power supply comprises, for each one of multiple sources of alternating current (AC), the AC sources configured to supply respective input AC signals each with defined phases, a control device configured to receive an input AC signal from an AC source and a neutral signal, each control device comprising a gated regulating system configured to provide an output AC signal according to a predetermined threshold value of current, a phase monitor to receive the output AC signals from each of the control devices, and an output device configured to output a three-phase power supply using the output AC signals, wherein the output device is configured to receive a control signal from the phase monitor, the control signal calculated on the basis of at least one of the input AC signals and the output AC signals.

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 invention relates to the technical field of uninterruptible power supplies (UPS), and discloses a UPS transformer voltage balance control method and system, and the method comprises the steps: building a communication link between a UPS transformer and a power module of sensitive equipment in a data center; receiving micro voltage quality data generated by monitoring micro transient fluctuation of the input voltage by the power supply module and feeding back; according to the microscopic voltage quality data, the influence of power supply quality on the sensitive equipment is evaluated, and an evaluation result is obtained; dynamically adjusting the target margin of the output voltage of each phase of the UPS transformer according to the evaluation result; according to the adjusted output voltage target margin, the output voltage of the UPS transformer is controlled, refined and dynamic balance control over the output voltage of the UPS transformer is achieved, tiny transient voltage fluctuation is effectively dealt with, the power supply quality of sensitive equipment is guaranteed, and the problem that tiny voltage fluctuation is difficult to perceive and process in the prior art is solved.

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 application provides a high-voltage direct-mounted flexible AC closed-loop device. The high-voltage direct-mounted flexible AC closed-loop device comprises a three-phase converter chain and three multi-winding transformers, wherein the three-phase converter chain connects a first AC system and a second AC system, each phase of the converter chain comprises N active submodules connected in series and a series reactor, and N is an integer greater than or equal to 1; each of the multi-winding transformers comprises a primary winding and N first secondary windings, with the N first secondary windings being connected to the N active submodules in a one-to-one correspondence mode; and the primary winding of each multi-winding transformer is connected to the first AC system or the second AC system.

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.

A constant voltage regulation system for super capacitor, comprises of a supercapacitor 1 for supplying electrical output for operating a load in EV / HEV, a voltage sensor to facilitate continuous monitoring of supercapacitor's voltage level, an inverter 2 for inverting incoming DC voltage into AC voltage, a controller 7 for analyzing range voltage level is falling, a voltage boosting circuit for selectively adjusting voltage level in accordance with received signal required for driving the load 9, a step-up transformer 3 composed of a primary winding 4 and secondary winding 5 having plurality of tap out 6 terminals in connection with load 9 via corresponding number of relays 8 for selectively tapping tap out terminal 6, a voltage level detection unit for sensing output voltage post tapping operation, a PWM control unit adjusts duty cycle for precise voltage adjustments of 0 boosted voltage and match required voltage to drive / handle the load 9.

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.

The invention relates to the technical field of transformer transformation control, in particular to an all-electric melting electric boosting transformer configuration system and method for glass manufacturing. The system comprises a high-voltage input module, a transformer voltage regulation module and a kiln heating module, the high-voltage input module inputs high voltage to the transformer voltage regulation module for voltage regulation and transformation and then directly accesses a kiln heating electrode of the kiln heating module, and the transformer voltage regulation module comprises an input side winding, an iron core and an output side winding. The invention provides a configuration mode for improving the power utilization efficiency of the all-electric melting electric boosting transformer for glass manufacturing, and the configuration mode combines the characteristics of glass production and the characteristics of voltage regulation of glass electric melting power supply, so that the characteristics of effectively reducing the generation of harmonic waves, reducing the overall installed capacity, and being large in voltage regulation range and high in glass type adaptability are achieved.