139 results about "Autotransformer" patented technology

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, power-side alternate current (AC) to direct current (DC) converters may be connected to a source power grid without the need for an isolation transformer by providing separate buses between the power-side AC-DC converters and load-side DC-DC converters instead of a shared DC bus between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tappable transformer or an autotransformer, to connect any number of auxiliary loads of the plant to the power grid. The adjustable transformer may provide for various types of auxiliary load devices to connect to the power provided by the transformer at the same time, including both three-phase devices and one-phase devices.

The present disclosure relates to circuits for connecting components of a hydrogen plant to a power grid to power the components in an efficient manner. In one implementation, a power-side alternating current (AC) / direct current (DC) converter can be connected to a source power grid without the need for an isolation transformer by providing a separate bus between the power-side AC / DC converter and the load-side DC / DC converter, instead of a DC bus shared between the converters. Other implementations for connecting components of a hydrogen plant to a power grid may include an adjustable transformer, such as a tap-changing transformer or an autotransformer, for connecting any number of auxiliary loads of the plant to the power grid. The adjustable transformer may accommodate various types of auxiliary load devices for connecting to the power provided simultaneously by the transformer, including both three-phase and one-phase devices.

A power converter includes an autotransformer, first switches, and second switches. The autotransformer includes multiple windings. The first switches are coupled between an input node and an output node of the power converter. The second switches are coupled between a reference potential and the output node. Yet further, the first switches are operable to control switching of circuit paths including the multiple windings of the autotransformer. The second switches are operable to convey currents from the multiple windings of the autotransformer through the second switches to the output node.

The high-impedance autotransformer comprises an iron core, a series winding, a common winding I and a common winding II, the common winding I and the common winding II are distributed in the axial direction of the iron core and located on different sections of the iron core, and the series winding, the common winding I and the common winding II are sequentially connected to the iron core in a sleeved mode. The coil supporting block is arranged between the windings and is fastened with the iron core; the supporting cushion blocks are arranged on winding end faces at the two ends of the transformer, and the coil supporting blocks and the supporting cushion blocks are made of insulating materials. The self-coupling transformer solves the technical problems that the self-coupling transformer in the prior art is low in short-circuit impedance and easy to damage during short-circuit impact.

The invention provides a 48V-6V direct-current converter topological structure applied to a data center and a control method of the 48V-6V direct-current converter topological structure. A main circuit of a converter comprises an input end, a load end, an input switch loop, a half-bridge full-wave rectification loop and a resonant cavity; the input filter capacitor # imgabs0 # is connected to the input end of the converter, and the output filter capacitor # imgabs1 # is connected to the output end of the converter; the input switch loop is composed of a switch tube S1, a switch tube S2 and a switch tube S3. The half-bridge full-wave rectification loop is composed of a switch tube # imgabs2 # and a switch tube # imgabs3 #; the resonant cavity is composed of a resonant capacitor # imgabs4 #, a resonant capacitor # imgabs5 # and an autotransformer AT; by applying the technical scheme, the requirements of large transformation ratio, large current, high efficiency and high power density of the bus converter can be integrally met.

The invention provides a partial power processing type ultra-high voltage conversion ratio switched capacitor converter topological structure and a control method thereof, and the structure comprises a high-voltage side port which is connected with a high-voltage power supply or a load; the high-voltage side filter is used for filtering high-voltage side power input or load output; the magnetic element unit comprises a two-winding and multi-winding transformer, an autotransformer, a center tapped transformer and a coupling inductor; the switched capacitor unit comprises at least two switches and one or more capacitors, and the number of the capacitors is n; the system further comprises a high-frequency rectification inverter and a low-voltage side filter, and the low-voltage side filter is used for filtering low-voltage side power input or load output. According to the technical scheme, the switched capacitor unit and the magnetic element unit are flexibly configured, and electric energy conversion with various high voltage conversion ratios can be realized only by using open-loop control.

The invention provides a zinc dross self-cleaning inductor operation control method and device based on a circulating gully, and relates to the technical field of industrial smelting furnaces, the method comprises the following steps: step 1, monitoring the temperature of zinc liquid in a zinc pot in real time through a temperature sensor, and transmitting a temperature signal to a temperature control instrument; 2, the temperature control instrument processes the temperature signal according to a set threshold value and outputs a high-temperature signal or a low-temperature signal to the programmable logic controller; and step 3, the programmable logic controller controls the contactor group to switch the output voltage of the autotransformer based on the temperature signal, so that the inductor operates in a low-power, medium-power or high-power mode. Through real-time temperature control, automatic power regulation and circulating gully, the liquidity and heating efficiency of molten zinc are improved, zinc slag blockage and manual cleaning are reduced, the service life of the inductor is prolonged, and the product quality is stabilized.

The application provides a high-power low-voltage starting rectifying device, which comprises a three-phase input power distribution and filter unit, a three-phase 12-pulse rectifying unit, a DC / DC unit I, a DC / DC unit II and a control module; the three-phase input power distribution and filter unit is connected with the three-phase 12-pulse rectifying unit, the three-phase 12-pulse rectifying unit adopts a differential connection triangle autotransformer 12-pulse rectifying technology and is connected with the DC / DC unit I and the DC / DC unit II respectively; the DC / DC unit I adopts a three-channel staggered parallel phase-shift full-bridge technology, and the DC / DC unit II adopts a single-channel phase-shift full-bridge technology; the control module is connected with the DC / DC unit I and the DC / DC unit II respectively; the control module is used for controlling the DC / DC unit I and the DC / DC unit II to convert direct current voltage and supply a hovercraft gas turbine. The hovercraft gas turbine can be started.

The invention discloses an autotransformer with a medium-voltage regulating coil located at a high-voltage coil, and belongs to the technical field of transformer manufacturing, the winding directions of a high-voltage coil upper half phase and a high-voltage coil lower half phase are opposite, and the head ends of the high-voltage coil upper half phase and the high-voltage coil lower half phase are connected in parallel and then are led out through a high-voltage outgoing line; the medium-voltage regulating coil is embedded in the high-voltage coil, the head ends of the upper half phase of the medium-voltage regulating coil and the lower half phase of the medium-voltage regulating coil are connected in parallel and are connected with the tail end of the high-voltage coil, and the tail ends of the upper half phase of the medium-voltage regulating coil and the lower half phase of the medium-voltage regulating coil are connected with the head end of the medium-voltage coil; the medium-voltage regulating coil is provided with a plurality of taps including a first-stage tap to a last-stage tap; the head end of the first-stage tap is connected with the tail end of the high-voltage coil, the tail end of the last-stage tap is connected with the head end of the medium-voltage coil, and a medium-voltage outgoing line is led out from each tap through a tap selector of the tap switch; a neutral point outgoing line is arranged at the tail end of the medium-voltage coil.

A resonant circuit for a DC-DC power converter. The resonant circuit includes: a resonant inductance and a resonant capacitance. The resonant capacitance is provided by two capacitors configured to be connected in series to an input switching stage of a DC-DC power converter, and the resonant inductance comprising a resonant inductor connected in series with a first of the capacitors. The resonant circuit can be part of a DC-DC power converter. The converter can include: input DC voltage bus; an input switching stage connected across the input DC bus; the resonant circuit; a voltage converter; and an output rectifier stage; wherein the voltage converter comprises an auto transformer having an input side inductance comprising a first inductance part (P11) and a second inductance part (P21) in series and a tap output between the first and second inductance part, wherein the voltage converter has a conversion ratio of (P11+P21) / P21.

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.

This application relates to the technical field of power electronics, and in particular to a full-bridge inverter series-resonant intermediate-frequency induction power supply with an autotransformer and a control method. It includes a full-bridge inverter circuit, an autotransformer, a series-resonant circuit composed of a series capacitor and a load inductor. The input end of the full-bridge inverter circuit is coupled to a direct-current input circuit. The direct-current input circuit includes a transformer, a rectifier circuit, and a wiring switch. One end of the wiring switch is coupled to the commercial alternating current, the other end of the wiring switch is coupled to the transformer, the other end of the transformer is coupled to the rectifier circuit, the output end of the rectifier circuit is coupled to the full-bridge inverter circuit, the output end of the full-bridge inverter circuit is coupled to the autotransformer, the series capacitor and the load inductor form a series-resonant circuit, and the output end of the autotransformer is coupled to the series-resonant circuit. This application has the effect of improving the stability and reliability of the power supply system.

This utility model provides a wiring system for the low-voltage side of a single-phase autotransformer and a prefabricated box-type switchgear in a confined space, comprising: a low-voltage bushing of the single-phase autotransformer, an aluminum tube busbar branch bus, an aluminum tube busbar main bus, a copper tube bus, and a prefabricated box-type switchgear. The low-voltage bushing of the single-phase autotransformer is connected to the aluminum tube busbar branch bus via a flexible copper busbar; the aluminum tube busbar branch bus is connected to the phase-separated aluminum tube busbar main bus via a flexible copper busbar; the aluminum tube busbar main bus is connected to the copper tube bus; and the end of the copper tube bus is connected to the prefabricated box-type switchgear. The wiring system provided by this utility model occupies little space and has a simple and compact layout; the delta connection on the low-voltage side of the transformer uses an aluminum tube bus to reduce costs, and the connection to the box-type switchgear bus avoids terrain limitations by using a flexible copper tube bus; the prefabricated box-type switchgear occupies little space, is easy to assemble and saves construction time, and the internal switch cabinet spacing is easy to expand.

The present invention relates to the field of automatic control technology, and particularly relates to an autotransformer step-down control system based on a PLC. It includes a main power supply circuit and a control loop. The autotransformer step-down control system based on a PLC of the present invention is controlled based on a programmable logic controller (PLC) and a touch screen, and improves the control loop of the XJ01 autotransformer. A main circuit AC contactor KM4 is added to the main circuit. When the star point short-circuit AC contactor KM1, the step-down operation AC contactor KM2, and the contacts are adhered, the internal timer T38 of the PLC detects an abnormality, and the main circuit AC contactor KM4 issues an immediate trip command to protect the motor and the autotransformer. The design concept of this solution is advanced, and the use of the PLC and the touch screen is stable, safe and reliable; compared with the original wiring method, the connection is simple; it is convenient to maintain, and even if the internal data is lost, the data can be restored in only a few minutes.

The invention discloses a series adjustable voltage source type direct current power flow controller circuit, a method and a terminal, the scheme provided by the invention adopts a single bridge arm structure design in a parallel connection part, an autotransformer and a resonance groove are introduced, the single bridge arm structure can reduce the number of power devices and magnetic core elements, and the size of the power devices and the magnetic core elements is reduced. Meanwhile, the amplitude of the output alternating voltage is improved by connecting the autotransformer in series, the current stress flowing through the sub-modules is reduced, the conduction loss can be reduced, it can be ensured that the full voltage of the system is controlled within the bearable range of the sub-modules of the parallel modules, and the system reliability is improved. The parallel module and the series module are connected in cooperation with the resonant tank, soft switching operation of the sub-module is achieved, current impact in the switching process is effectively restrained, switching loss is greatly reduced, hardware configuration of a series adjustable voltage source type direct current power flow controller circuit is simplified, and the reliability of the direct current power flow controller circuit is improved. And the equipment cost and the structural complexity are reduced.

The invention provides a wiring system for a low-voltage side of a single-phase autotransformer and a box-type switching station in a confined space. The wiring system comprises a single-phase autotransformer low-voltage sleeve, an aluminum tube bus branch bus, an aluminum tube bus main bus, a copper tube bus and a prefabricated box-type switching station, the single-phase autotransformer low-voltage bushing is connected with the aluminum tube bus branch bus through the flexible connection copper bar; the aluminum tube bus branch bus is connected to the aluminum tube bus main bus which is arranged in a split-phase manner through a flexible connection copper bar; the aluminum tube bus main bus is connected with the copper tube bus; and the tail end of the copper pipe bus is connected to the prefabricated box-type switching station. The wiring system provided by the invention is small in occupied area and simple and compact in arrangement; triangular wiring at the low-voltage side of the transformer adopts aluminum pipe bus connection to reduce the cost, and the rear part is connected to a box-type switching station bus to avoid terrain limitation and adopts a copper pipe bus with good flexibility for connection; the prefabricated box-type switching station is small in occupied area, simple to assemble and capable of saving the construction period, and internal switch cabinets are easy to expand at intervals.

The invention discloses an automatic voltage regulating and stabilizing device for a power electronic SVR circuit, and belongs to the technical field of power electronics. Comprising a self-coupling voltage regulator unit, a power electronic regulation unit and a bypass unit, the self-coupling voltage regulator unit is connected in series with the power electronic regulation unit, and the bypass unit is connected in parallel with the power electronic regulation unit; the power electronic regulation unit is a unified power quality regulator with a series-parallel connection structure and comprises a series connection side module and a parallel connection side module; and a series winding and a parallel winding of the unified power quality regulator and an autotransformer of the autotransformer voltage regulator unit adopt a winding integrated structure design. According to the medium-voltage power distribution network voltage regulating device, the self-coupling voltage regulator and the unified power quality regulator (UPQC) of a series-parallel structure are deeply fused, and an integrated framework with coarse and fine regulation coordinated voltage regulation, winding integration and fault bypass redundancy is designed; the comprehensive improvement of the voltage regulation performance, the service life of the device, the electric energy quality treatment, the structure cost and the operation reliability is realized.

A power module includes N groups of interleaved parallel PFC circuits and a controller. Each group of the interleaved parallel PFC circuits includes a PFC inductor, an autotransformer, a first rectifier bridge arm, and a second rectifier bridge arm. The autotransformer includes a first winding and a second winding that are coupled to each other. The controller is configured to: in response to that an absolute value of a difference between a current of the first winding and a current of the second winding is greater than or equal to a preset value, adjust a duty cycle of a drive signal of a switching transistor of the first rectifier bridge arm or the second rectifier bridge arm in a next switching cycle.

Solid-state autotransformers are provided. A system can include a first switch coupled to a first line in which an alternating current signal is conveyed. The system can include a second switch coupled to a second line in which the alternating current signal is conveyed. The second switch can be coupled to the first switch. The first switch can, responsive to a magnitude of a first voltage from the first line to a terminal exceeding a magnitude of a second voltage from the second line to the terminal, pass current from the first line to the terminal. The second switch can, responsive to the magnitude of the second voltage exceeding the magnitude of the first voltage, pass current from the second line to the terminal.

The invention discloses a GIC blocking method under geomagnetic disturbance based on real-time reactive monitoring of a transformer. The method comprises the following steps: judging whether an estimated GIC amplitude meets a first preset threshold condition or not; if so, taking the estimated GIC amplitude as a final GIC amplitude; if not, obtaining the equivalent inductance of the autotransformer, and based on an Lmef-Idc nonlinear curve established through a three-dimensional electromagnetic field-circuit coupling simulation technology, carrying out backstepping and obtaining a final GIC amplitude corresponding to the equivalent inductance at the moment; on the basis of a controllable resistance type dynamic blocking and closed-loop control strategy monitored and fed back in real time, whether the GIC amplitude meets a second preset threshold value condition or not is judged, and when the second preset threshold value condition is not met, an adjustable resistor in the GIC blocking device is adjusted till the obtained final GIC amplitude meets the second preset threshold value condition. According to the method, the problem that GIC blocking of the autotransformer under geomagnetic disturbance cannot be effectively achieved through an existing method is solved.

The invention discloses a grid-connected inverter control method, device and system, and relates to the technical field of inverter control, and the grid-connected inverter control method comprises the following steps: S10, obtaining a power grid side three-phase current, and carrying out the dq conversion of the power grid side three-phase current to obtain a d-axis current component and a q-axis current component of the power grid side three-phase current; s20, calculating the d-axis current component and the q-axis current component of the three-phase current at the power grid side according to a preset fractional order self-coupling PI lambda control algorithm to obtain a control output signal; and S30, performing dq inverse transformation and pulse width modulation processing on the control output signal, and inputting the control output signal to a grid-connected inverter. The fractional order self-coupling PI lambda control algorithm is adopted to control the grid-connected inverter, on one hand, the characteristic that existing self-coupling PI control is high in disturbance rejection capacity is inherited, on the other hand, the control precision of the existing self-coupling PI control is further improved by adding a fractional order integration link, and the electric energy quality of an input power grid of the grid-connected inverter is effectively improved.

The utility model discloses a PTCR thermal resistor breakdown voltage test circuit and device, relates to the technical field of thermal resistor test, and solves the problem that a secondary PTCR thermal resistor may be broken down and burnt down when the current of a primary coil reaches empty boiled water in the existing PTCR thermal resistor breakdown voltage test circuit. According to the technical scheme, the system is characterized by comprising a primary air switch, an autotransformer, a boosting transformer and a secondary air switch, one end of the primary air switch is connected with an AC power supply, the other end is connected with the primary of the autotransformer, the secondary of the autotransformer is connected with the input of the boosting transformer, the output of the boosting transformer is connected with the secondary air switch, and the secondary air switch is connected with the test fixture; wherein the air switch current value of the primary air switch is greater than the air switch current value of the secondary air switch; a small-current secondary air switch is additionally arranged in a secondary loop of the test circuit to serve as a protection device, so that the test fixture and other devices in the loop are effectively protected while the test purpose is achieved.

The invention relates to a railway flexible traction power supply system and a control method thereof. The system comprises a plurality of substations, a partition station, an autotransformer station, a first flexible power supply device, a second flexible power supply device and an energy management control center. Wherein the substations are connected in parallel with a contact network, a section post is arranged between the adjacent substations, an autotransformer station is arranged between the adjacent substations and the section post, and the first flexible power supply device and the second flexible power supply device are correspondingly connected with the substations and the section post respectively. And controlling the flexible power supply device to realize energy scheduling between power transformation. The system can improve the locomotive regenerative braking energy utilization rate.

The utility model discloses a conversion protection device applied to a transformer and a three-phase autotransformer cabinet. The device comprises a circuit breaker QF1, a soft start safety assembly, an autotransformer T1 and a secondary power supply assembly, wherein the soft start safety assembly comprises a time relay KM1, a time relay KM2, a resistor Ra, a resistor Rb and a resistor Rc; the U phase, the V phase and the W phase of the circuit breaker QF1 are respectively connected with the A phase, the B phase and the C phase of a time relay KM1; the U phase, the V phase and the W phase of the full relay KM2 are respectively connected with resistors Ra, Rb and Rc and then are connected with the time relay KM1 in parallel; the U phase, the V phase and the W phase of the time relay KM1 are respectively connected with the A phase, the B phase and the C phase of the autotransformer T1; the secondary power supply assembly is connected with the U phase and the V phase of the circuit breaker QF1. According to the utility model, the time relay KM2 is connected in series with the resistor and then is connected in parallel with the time relay KM1 serving as a main power switch, and the contact of the time relay KM1 is delayed to be closed, so that the purpose of suppressing peak surge is achieved, and the main power switch device is protected.

The invention belongs to the technical field of voltage-withstanding instrument boosting power supplies, and particularly relates to a full-voltage-range high-performance boosting device and a control method thereof. The device comprises a front-stage electric self-coupling voltage regulator and a rear-stage full-bridge inverter, the front-stage electric self-coupling voltage regulator is associated with the rear-stage full-bridge inverter through a direct-current bus to perform voltage linkage control; the front-stage electric self-coupling voltage regulator is used for realizing alternating current voltage regulation in a range of 0-220V; and the post-stage full-bridge inverter is used for converting the voltage-regulated alternating current into 0-311V variable direct current voltage, and inverting the direct current voltage to obtain the required output voltage. According to the invention, through a cooperative control strategy, full-range high-precision and low-harmonic voltage output from zero to rated voltage can be realized.

This invention provides a high-voltage, high-capacity autotransformer, comprising: a supporting capacitor, an energy buffer bridge arm, and a converter valve assembly. The supporting capacitor forms part of the power transmission loop; the energy buffer bridge arm realizes the main power transmission and forms another part of the power transmission loop; the transformer commutation is achieved by controlling the number of bridge arm sub-modules engaged in the energy buffer bridge arm and the trigger signal of the converter valve assembly. The invention also provides a commutation operation method and a control method for this transformer. This invention realizes energy transfer from the low-voltage side to the high-voltage side, improves transformer efficiency, and achieves energy balance in the energy buffer bridge arm; by controlling the number of energy buffer bridge arm sub-modules engaged, reliable shut-off and near-zero voltage conduction of the converter valve are achieved, while providing two closed-loop modes: DC voltage and power control. This invention realizes a high-voltage, high-capacity DC transformer, and by using a semi-controlled converter valve, reduces device costs.

A power supply system (100) for an aircraft, comprising: a plurality of main generators located in a left channel and a right channel; an auxiliary power unit (APU) starter generator (ASG) located in the right channel and configured to supply power when the main generators fail; a plurality of transformer rectifier units (TRUs) located in the left channel, the right channel and an emergency channel; a plurality of autotransformer units (ATUs) located in the left channel, the right channel and the emergency channel; and a ram air turbine (RAT) located in the emergency channel. The present invention further relates to a method for using a power supply system to supply power an aircraft.

A bus converter includes an inverter circuit including a first switching circuit and a second switching circuit. The first resonance circuit comprises a first capacitor. The autotransformer circuit comprises a first autotransformer, a third switching circuit, a fourth switching circuit and a first output end. The transformer circuit comprises a first transformer, a fifth switching circuit, a sixth switching circuit and a second output end; the first transformer comprises a third winding, a fourth winding and a fifth winding. After an input voltage passes through the bus converter, the bus converter can control the first switching circuit and the second switching circuit in the inverter circuit to be switched on or switched off, so that the input voltage is divided through the autotransformer circuit and is divided through the transformer circuit, and the bus voltage output by the bus converter is reduced; therefore, the bus voltage output by the bus converter is reduced as much as possible, the transformation ratio of the bus converter is improved, and the power efficiency of the POL converter connected with the output end is improved.