112 results about "Solid state transformer" patented technology

The invention discloses a control method for a self-adaptive voltage-regulating and energy-saving solid-state transformer of a power distribution network, which relates to the technical field of power distribution network regulation and control, and comprises the following steps: firstly, acquiring voltage, current, power and constraint information of a low-voltage side in the operation of the solid-state transformer, detecting natural voltage-regulating events such as superior tapping deflection, voltage regulator action and reactive switching, and performing voltage regulation on the solid-state transformer; establishing an evidence chain record containing a timestamp, a steady-state window and a quality identifier, and not injecting identification disturbance; secondly, intercepting a steady-state window and avoiding a transient state according to an evidence chain, estimating voltage-power elasticity, and performing confusion filtering and quality scoring; constructing a regression baseline in parallel, synthesizing a contrast baseline and an event anchoring calibration baseline, fusing to obtain anti-fact baseline power and uncertainty, and calculating energy saving amount; and finally, according to the uncertainty, the quality score, the end margin and the device constraint gating, the voltage setting is updated, and safe rollback is carried out, so that the energy-saving amount can be audited, the control is more stable, and the out-of-limit risk is reduced.

A distributed SST-based power dispensing network, comprising a main cell system including a main cell and a main cell controller, the main cell having main cell converter circuitry including a primary bridge of a dual active bridge (DAB), the main cell controller configured to control the primary bridge and configured to activate main cell forward mode control circuitry or main cell reverse mode control circuitry perform based on a direction of power flow; and a power dispensing system including a power dispenser and a power dispenser controller, the power dispenser having power dispenser converter circuitry including a secondary bridge of the DAB, the power dispenser controller configured to control the secondary bridge and configured to activate power dispenser forward mode control circuitry or power dispenser reverse mode control circuitry based on the direction of power flow.

The invention discloses a power module and a solid-state transformer, belongs to the field of solid-state transformers, and considers that the power module can be divided into a medium-voltage circuit and a low-voltage circuit, and electric energy required by the low-voltage circuit and the medium-voltage circuit can be uniformly obtained based on low voltage provided externally. Therefore, the low-voltage auxiliary source can supply power to the low-voltage circuit based on the electric energy provided by the system auxiliary power supply, and the medium-voltage auxiliary source obtains the electric energy from the low-voltage auxiliary source in an electrical isolation mode and supplies power to the auxiliary circuit in the medium-voltage circuit, so that the system auxiliary power supply can supply the electric energy to the low-voltage auxiliary source through the low-voltage cable. The level requirement of protection design is reduced, and the cost is reduced; and the medium-voltage auxiliary source and the low-voltage auxiliary source are electrically isolated, so that the system control module can directly send a system control instruction to the low-voltage circuit through a low-cost cable, and the cost is further reduced.

The invention provides an SST driving type high-voltage full-direct-current power supply framework suitable for an MW level computing power cabinet, and belongs to the technical field of data center power supply and distribution. The SST driving type high-voltage full-direct-current power supply framework comprises a solid-state transformer, the solid-state transformer comprises a rectifier and a dual-active-bridge converter which are cascaded, and the rectifier is connected with medium-voltage alternating current of a power grid and used for converting the medium-voltage alternating current into direct current of a first voltage value and outputting the direct current to the dual-active-bridge converter; the dual-active bridge converter is used for converting the direct current of the first voltage value into direct current of a second voltage value and outputting the direct current through the direct current bus, and the second voltage value is smaller than the first voltage value; and the data center load is connected to the direct current bus, and the rated voltage of the data center load is matched with the second voltage value. The MW level computing power cabinet can improve the transmission efficiency, adapts to MW level power density, realizes high-speed dynamic response to adapt to the load characteristics of the AI data center, and is beneficial to saving the space of a machine room and improving the computing power density.

The invention discloses a parallel port type hexagonal frequency mixing solid-state transformer and a regulation and control method and device thereof, and the method comprises the steps: under the conditions that the direct-current active power and the alternating-current active power of the solid-state transformer are equal, and the instantaneous active power absorbed by each sub-bridge arm is 0, calculating the frequency of each sub-bridge arm in each sub-bridge arm; the stability relation between the fundamental frequency alternating current port current distribution coefficient and the intermediate frequency alternating current port current distribution coefficient is determined; and calculating a bridge arm circulation current through the stability relationship, thereby calculating to obtain a bridge arm circulation voltage reference value, calculating to obtain a sub-module capacitor voltage reference value of each sub-bridge arm, superposing each sub-module capacitor voltage correction component of each sub-bridge arm, obtaining a corresponding optimized sub-module capacitor voltage, and generating a corresponding modulation signal. By the adoption of the technical scheme, the multi-scene access requirement of the alternating current and direct current hybrid power distribution network is met, and inherent decoupling of three-frequency components including direct current, fundamental frequency and intermediate frequency can be achieved without an additional frequency selection network under the corresponding control method.

The invention discloses a power module and a solid-state transformer power cabinet structure system.The power module comprises a module shell; a high-voltage power unit, a transformer and a low-voltage power unit are arranged in the power conversion module, and a complete power conversion path is formed; the high-voltage power unit comprises an integrally-formed solid insulation shell, and the solid insulation shell is used for packaging a power circuit board and achieving external insulation. One side of a panel of the high-voltage power unit and one side of a tail-end panel of the low-voltage power unit are respectively provided with a first conductive connecting end, and an electrical gap and a creepage distance between the first conductive connecting end and a module shell and between the first conductive connecting end and an internal structural member of the power cabinet meet preset insulation requirements; the power module is further integrated with a temperature adjusting unit, the temperature adjusting unit comprises a controller, a heat dissipation actuator and a plurality of temperature sensors, the temperature sensors are arranged in the high-voltage power unit and the low-voltage power unit and on the heat dissipation actuator and the transformer, and the controller is in signal connection with the temperature sensors and the heat dissipation actuator.

The application discloses a kind of multi-port solid state transformer coordination control method, device, terminal and medium, it is related to power distribution network technical field, the scheme provided in the present application is matched with bus voltage hierarchical threshold by equipment type division, the coordination control logic of different equipment is dynamically matched, the collaborative optimization of photovoltaic power generation maximum power tracking, energy storage charge-discharge power regulation and load hierarchical switching is realized, ensure that photovoltaic, energy storage and load equipment form optimal cooperation under different working conditions, with the advantages of improving the reliability of multi-energy system power supply and power quality, avoiding direct current bus voltage overrun and equipment overload risk.

The invention relates to the technical field of power electronics and transformers, in particular to a solid-state transformer fault early warning and isolation system based on protocol access, which is characterized in that when a solid-state transformer is started, a data frame generated by equipment is collected and stored by a sensor through a local control module; the protocol analysis module receives the equipment data frames and extracts information in the equipment data frames in a dynamic analysis mode; the fault early warning module analyzes the analyzed data based on a fault prediction model, predicts possible transformer faults, and evaluates prediction results; the fault isolation module is used for positioning equipment needing to be isolated according to an evaluation result, and generating related fault information by disconnecting the equipment from other components; the communication interface module reports the fault information to a central server or superior equipment for further analysis and processing of fault data; according to the system, real-time monitoring, fault early warning and intelligent isolation of the solid-state transformer are realized, and the operation safety and stability of equipment are improved.

A power apparatus applied in a solid state transformer structure includes an AC-to-DC conversion unit, a first DC bus, and a plurality of bi-directional DC conversion units. First sides of the bi-directional DC conversion units are coupled to the first DC bus. Second sides of the bi-directional DC conversion units are configured to form at least one second DC bus, and the number of the at least one second DC bus is a bus number. The bi-directional DC conversion units receive a bus voltage of the first DC bus and convert the bus voltage into at least one DC voltage, or the bi-directional DC conversion units receive at least one external DC voltage and convert the at least one external DC voltage into the bus voltage.

The application provides a power module and a solid-state transformer system, the power module comprising: a circuit module having a voltage level; and a cabin body for covering the circuit module by bending or splicing, and the cabin body having a shielding structure, the shielding structure comprising: a first conductor layer located on a side close to the circuit module and connected to the circuit module in an equipotential manner; a second conductor layer spaced apart from the first conductor layer and located on a side away from the circuit module; and a solid insulation layer arranged between the first conductor layer and the second conductor layer and used for electrically isolating the first conductor layer from the second conductor layer. The power module provided by the application has good insulation performance and is easy to assemble.

This application relates to a collaborative design method, apparatus, device, and storage medium for solid-state transformers. The method includes: determining first generation parameters for a power conversion component in the solid-state transformer, based on desired operating parameters of the power conversion component, the power conversion component including devices and / or magnetic components, and the first generation parameters including the component type and target operating parameters of the power conversion component; determining a control mode for the power conversion component based on the desired operating parameters; and determining second generation parameters for the solid-state transformer based on the first generation parameters and the control mode. This method enables the collaborative design of core components in a solid-state transformer.

The present disclosure provides a power module and a solid-state transformer system. The power module includes: a circuit module, having a voltage level; and a cabin, configured to wrap the circuit module by bending or splicing, where the cabin has a shielding structure, the shielding structure including: a first conductor layer, located at a side close to the circuit module and equipotentially connected to the circuit module; a second conductor layer, arranged apart from the first conductor layer and located at a side away from the circuit module; and a solid insulating layer, provided between the first conductor layer and the second conductor layer for electrically isolating the first conductor layer and the second conductor layer. The power module provided by the present disclosure has good insulation performance and is easy to assemble.

The invention provides a flywheel medium-voltage dynamic UPS system based on SST, and relates to the technical field of power supply circuits, and the system comprises a main power supply access which is connected between a medium-voltage input end and a load output end, and is provided with a first input switch, a first static valve group and an output switch; the static bypass path is connected with the main power supply path in parallel, and a second input switch and a second static valve group are arranged on the static bypass path; the alternating current side of the solid-state transformer is connected to the load output end in parallel; and a direct-current bus of the flywheel direct-current energy storage system is connected to the direct-current side of the solid-state transformer, so that the solid-state transformer forms a power electronic conversion interface for electric energy exchange and grid connection between the flywheel direct-current energy storage system and the load output end. According to the invention, the solid-state transformer is used for replacing a traditional conversion device, thereby simplifying the structure, improving the system efficiency, reducing the occupied area, guaranteeing the continuous power supply of a load, and improving the power quality of the load.

This invention relates to the field of power electronic transformer winding technology, and more particularly to a strip-shaped Litz wire for solid-state transformers and its preparation method. The strip-shaped conductive core is composed of multiple enameled copper single wires; and a composite insulating coating covers the outer surface of the strip-shaped conductive core. The composite insulating coating comprises a polyimide matrix and chopped silica fibers dispersed in the polyimide matrix, with zinc oxide quantum dots anchored on the surface of the chopped silica fibers. The advantages of this invention are that by anchoring zinc oxide quantum dots to the surface of the chopped silica fibers and dispersing them in the polyimide matrix, the quantum dots are uniformly dispersed, forming a nonlinear conductivity network, suppressing partial discharge initiation, and improving corona resistance lifetime. The chopped silica fibers form a rigid skeleton in the coating, improving mechanical strength. The chemical bonding between the quantum dots and the fiber surface enhances interfacial bonding, further improving mechanical properties. Simultaneously, this structure avoids insulation defects introduced by nanoparticle aggregation, maintaining a high breakdown field strength and partial discharge initiation voltage.

A universal power flow controller, UPFC, for a high-power AC system having a multi-phase power supply line for providing power from a utility supply to a load, the multi-phase power supply line having at least a first to third phase, the UPFC comprising: a parallel coupling system configured to be connected to the power supply line in parallel for transmitting an input electric power between the parallel coupling system and the power supply line; a series coupling system comprising at least one first full-bridge, FB, converter configured to be connected in series to the first phase for transmitting a first output electric power between the at least one first FB converter and the first phase, at least one second FB converter configured to be connected in series to the second phase for transmitting a second output electric power between the at least one second FB converter and the second phase, and at least one third FB converter configured to be connected in series to the third phase for transmitting a third output electric power between the at least one third FB converter and the third phase; and an interconnection system comprising at least one first solid state transformer, SST, connecting the parallel coupling system to the at least one first FB converter, at least one second SST connecting the parallel coupling system to the at least one second FB converter, and at least one third SST connecting the parallel coupling system to the at least one third FB converter.

A balanced bi-directional CLLC transformer circuit comprising: a first converter comprising a first set of switches; a second converter comprising a second set of switches; a transformer; a primary resonant circuit; and a secondary resonant circuit; wherein the first converter and the primary resonant circuit are electrically coupled to a primary winding of the transformer; wherein the second converter and the secondary resonant circuit are electrically coupled to a secondary winding of the transformer; wherein the primary resonant circuit is balanced across the primary winding of the transformer; and wherein the secondary resonant circuit is balanced across the secondary winding of the transformer.

This invention discloses a solid-state transformer efficiency testing device and method, belonging to the fields of power electronics technology and power conversion testing technology. The device includes a 380V AC power supply. The output of the 380V AC power supply is connected to the input of an AC-DC module. The output of the AC-DC module is connected to a DC bus. The DC bus is connected to the power input of an inverter power supply unit array. The secondary side output of the inverter power supply unit array is connected to a high-voltage frequency converter module. The DC bus is also connected to the low-voltage DC output of the solid-state transformer under test via a feedback branch. The output of the high-voltage frequency converter module is connected to the high-voltage input of the solid-state transformer under test. An input-side energy metering device is installed between these components, and an output-side energy metering device is installed on the feedback branch. This invention eliminates the need for a high-voltage power supply and a high-power load, enabling continuous full-power operation and efficiency testing under different load rates. It offers advantages such as low cost, low power consumption, and grid friendliness.

The invention discloses a sub-module redundancy scheduling control method and system for a solid-state transformer, and belongs to the technical field of power grids, and the method comprises the steps: obtaining the demands of a modular multi-level solid-state transformer, triggering a redundancy scheduling control module, and executing a redundancy regulation and control decision of an electrical topology dimension and a function role dimension; the redundancy scheduling strategy is issued to a sub-module local controller, and redundancy regulation and control driving is carried out; the redundancy regulation and control decision-making step comprises the following steps of: executing dynamic graph optimization based on an electrical topology dimension and an operation mode loading switching decision of a function role dimension by adopting an operation redundancy scheduler in a redundancy scheduling control module; and if the operation mode is a fault bypass mode, migrating to a fault redundancy scheduler in the redundancy scheduling control module, and performing a directional scheduling decision based on redundancy hierarchy. The technical effects that the highest utilization rate of the sub-modules is ensured, and meanwhile the continuous operation capacity of the system under multiple redundancy and faults is achieved are achieved.

The invention discloses a frequency mixing regulation and control method and device based on a four-bridge-arm type frequency mixing solid-state transformer. The method comprises the following steps: respectively calculating modulation signals of four sub-bridge arms in the solid-state transformer; performing quantization processing on the modulation signals of the four sub-bridge arms by using nearest level approximation modulation to generate step waves, and determining the number of basic sub-modules put into use in each sub-bridge arm according to the voltage amplitude of the step waves; in the control period, if the step waves change, the corresponding sub-bridge arms are controlled; in the control period, if the voltage imbalance value is larger than the corresponding threshold value, the N sub-modules in the sub-bridge arm are put into use, and N is the number of the basic sub-modules. According to the technical scheme, control is performed only when step waves change, so that the switching action times of the sub-modules are remarkably reduced, and the switching frequency is reduced; only when the voltage imbalance value is too high, forced sequencing control is carried out on sub-module switches in the sub-bridge arms, the switching frequency is reduced, and the switching loss is reduced.

The application discloses a kind of based on model parameter self-correction's solid state transformer predictive maintenance method, comprising the following steps: constructing the multilevel parameterization model of SST and training it;Using the algorithm of RLS and APF combination to the parameter of the multilevel parameterization model of SST trained to carry out self-correction;According to the health index of model parameter and its nominal value after correction, the health index of each component of SST is calculated;The health index sequence of each component of SST is input into LSTM model and the residual service life of each component of SST is output after operation;Whether the health index or residual service life of any component in SST reaches corresponding preset threshold is judged, if yes, early warning signal is triggered, and targeted predictive maintenance decision is generated accordingly.The application solves the problem that the digital twin model used in the existing SST predictive maintenance method is mostly static or offline calibration model, which cannot adapt to the time-varying dynamic characteristics of SST in actual operation process, resulting in low reliability of the state evaluation results output by the model.

The utility model provides a sub-cabinet type outdoor solid-state transformer, which comprises a plurality of split cabinets connected in sequence, a plurality of secondary cables and copper bars are arranged between the split cabinets, a first waterproof structure is sleeved outside each secondary cable, and the first waterproof structure comprises a mounting sleeve, a cable sleeve and a waterproof component, the mounting sleeve is fixedly connected to the side wall of the split cabinet; the cable sleeve is arranged in the installation sleeves of the two connected split cabinets in a penetrating mode, and the waterproof assembly is fixedly connected between the installation sleeves and the cable sleeve. The split cabinet adopts a standardized interface design, and capacity expansion can be realized by increasing or decreasing the number of the cabinet bodies. The waterproof connection structure of the copper bars and the cables adopts prefabricated assemblies, only modular splicing needs to be completed during field installation, the construction efficiency is improved, and the waterproof connection structure is particularly suitable for power grid transformation scenes and outdoor scenes needing staged capacity expansion.

A power conversion system includes a high voltage (HV) switchgear; a solid-state transformer; and a low voltage (LV) switchgear. The HV switchgear connects to and disconnects from a HV network. The HV switchgear connects to an input of the solid-state transformer, which comprises first and second modules. The first module converts an HV alternating current (AC) signal into a HV DC signal, and the first module converts an HV DC signal into an HV AC signal. The second module converts an HV DC signal into at least one LV DC signal, and the second module converts at least one LV DC signal into an HV DC signal. The LV switchgear connects to an output of the solid-state transformer. The LV switchgear connects to a plurality of applications or devices and disconnects from the plurality of applications or devices.

The application relates to the technical field of transformers, and discloses a loss optimization method and system for a solid-state transformer Litz wire winding. The method comprises the following steps: collecting a non-sinusoidal wave excitation signal, performing Fourier transform to obtain a frequency spectrum, and determining distribution characteristic data; adopting a genetic algorithm in combination with a frequency loss model to take Litz wire structure parameters as optimization variables, obtaining a structure parameter set for initially minimizing total loss and iteratively matching, and obtaining the Litz wire structure parameters; simulating the current flow path between winding layers through electromagnetic field simulation, and constructing a frequency-dependent current distribution model; extracting the loss density of each layer, identifying the loss concentration area, fine-tuning the equivalent capacitive reactance parameters to redistribute the current until the interlayer loss is balanced, and obtaining a final balanced distribution scheme; and finally, verifying the energy transmission under multiple working conditions, calculating the overall efficiency and temperature rise, and outputting the Litz wire structure parameters and winding layout that pass the verification. The application improves the energy transmission efficiency of the solid-state transformer under non-sinusoidal wave excitation.

The present invention relates to an initial driving device and method of a solid-state transformer which reduces the overall number of solid-state transformer components and improves system reliability by charging an internal capacitor of the solid-state transformer using an existing battery instead of a separate external power source. The initial driving device of a solid-state transformer of the present invention is composed of an alternating current (AC) / direct current (DC) converter configured to convert system power to direct current, a high voltage converter configured to convert an output of the AC / DC converter to a high voltage, a medium frequency transformer (MFT) configured to convert an output of the high voltage converter to a low voltage, a low voltage converter configured to convert an output of the MFT to a charging voltage of an electric vehicle or battery, and a controller configured to control operations of the AC / DC converter, the high voltage converter, the MFT, and the low voltage converter.

The application discloses a solid-state transformer function test system and method based on a small-power energy feedback opposite-pulling method, belongs to the technical field of solid-state transformer testing, and comprises: a power grid working condition simulation module, which is used for simulating a power grid working condition according to actual function test requirements and outputting a power grid simulation signal; a solid-state transformer to be tested, which executes regulation and control in response to the power grid simulation signal and outputs a signal after regulation and control, and an output port of the solid-state transformer to be tested is electrically connected with an input port of the power grid working condition simulation module to form an energy feedback opposite-pulling loop with energy closed loop; and a function test module, which is used for collecting electrical parameters at the output port of the power grid working condition simulation module, the output port of the solid-state transformer to be tested and the input port of the solid-state transformer to be tested, and testing the function of the solid-state transformer to be tested according to the electrical parameters. The technical problem that the prior art is difficult to realize the accurate test of the electrical performance of the solid-state transformer under the premise of controlling the test cost and reducing energy consumption is solved.

The invention discloses a battery formation power supply system based on a solid-state transformer. The battery formation power supply system comprises an optimization decision center, a cluster coordination controller, a local controller and a physical system, the local controller is arranged in a physical system; the physical system comprises N solid-state transformers, and the cluster coordination controller is arranged in one solid-state transformer and is connected with other solid-state transformers and the local controller through optical communication; and the optimization decision center is connected with the cluster coordination controller through communication. The invention further discloses a power supply method of the battery formation power supply system based on the solid-state transformer. The energy efficiency can be improved, and the lowest total loss of the battery formation power supply system based on the solid-state transformer is ensured; the operation cost is minimized through a time-of-use electricity price strategy, and the economic benefit is improved; the devices are standby for each other to support seamless switching of faults, and the reliability is high; high-quality direct-current voltage is always kept; and meanwhile, the renewable energy consumption capability is maximized, and the utilization rate of green energy such as photovoltaic energy is effectively improved.

A decoupled system for controlling a solid state transformer (SST), the SST comprising an AC-to-DC stage, a DC-to-AC stage, and a DC-to-DC stage, the DC-to-DC stage comprising one or more DC-to-DC converters. The system comprises a stored energy controller coupled to the AC-to-DC stage, the energy controller configured to control the total amount of stored energy within the capacitors of the SST; a power flow controller coupled to the DC-to-AC stage, the power flow controller configured to control power flow in the SST; and one or more energy balancing controllers each coupled to a corresponding DC-to-DC converter, each energy balancing controller configured to balance energy in the corresponding DC-to-DC converter.

This application provides a method for topology reconfiguration and model predictive control of solid-state transformers under extreme temperatures. The method includes: monitoring the instantaneous waveforms of power devices during topology reconfiguration; calculating the local temperature rise curve using a thermal network model based on finite metadata; determining the initial degree of change in the device polarization state based on the temperature rise; if the degree of change exceeds a limit, predicting and dynamically adjusting electrical characteristics by fusing temperature and polarization data through a neural network; estimating the millisecond-level peak temperature distribution by combining nonlinear feedback acceleration trends and electrothermal interaction mechanisms; outputting an alarm if the peak temperature exceeds a safety threshold, and fusing high-frequency topology data and polarization information to generate an optimized phase shift angle or frequency adjustment scheme. This invention solves the problem of local overheating caused by electrothermal polarization coupling effects during topology switching in solid-state transformers.

The invention discloses a non-polar high-voltage foamed aluminum-based hybrid super capacitor and a preparation method thereof, and belongs to the technical field of super capacitors. The super capacitor adopts a symmetrical non-polar structure, a composite electrode comprises a pure aluminum current collecting layer, a foamed aluminum matrix layer and a uniform anodized aluminum oxide insulating layer which is prepared by coating the surface of a matrix aluminum rib with a directional scouring process, active carbon coating without hole blockage is realized through gas-phase camphor occupation, and the rated working voltage of a monomer is 6-10V; and after being connected in series and in parallel and superposed, a plurality of monomers are packaged by insulating heat-conducting silica gel and a heat-dissipating aluminum shell to form a high-voltage module The industrial problems of foamed aluminum pore-forming carbonization, uneven oxidation film and activated carbon hole blocking are thoroughly solved, the product power density is 15-25 kW / kg, the cycle life is larger than or equal to 1 million times, breakdown is avoided through nonpolar reverse connection, and the method can be widely applied to middle-high voltage power electronic scenes such as inverters, frequency converters, solid-state transformers and power reactive compensation.

The application discloses a power distribution network voltage and frequency regulation control method based on a three-stage solid-state transformer. The application scene of the control method is a three-stage solid-state transformer of a power distribution network, and the structure of the three-stage solid-state transformer comprises an input-stage AC-DC converter, an isolation-stage DC-DC converter and an output-stage DC-AC converter. The control method mainly comprises three parts: input-stage network-side voltage regulation control, isolation-stage single-voltage closed-loop control and output-stage network-side frequency regulation control. The controllability of input and output voltage and current of the three-stage solid-state transformer is fully utilized, and the regulation of active power and reactive power is separated: the input reactive current is controlled in the input stage, the input reactive power is regulated through the reactive current to achieve the purpose of regulating the network-side voltage; and the output voltage is controlled in the output stage, the active power consumption of the load is regulated through the voltage to support the network-side frequency. The control method is simple and convenient, does not need to increase auxiliary equipment, and can well regulate the network-side voltage and frequency.