146 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.

The invention discloses a solid-state transformer magnetic core loss calculation method adaptive to electric power system characteristics. The method comprises the following steps: firstly, collecting actually measured ferrite core loss data, and fitting hysteresis and eddy current loss parameters of a classical two-item model; setting 100kHz as a low-frequency and medium-high-frequency demarcation point through an eddy current and magnetic hysteresis loss balance point and a relaxation effect, and dividing three frequency bands by taking a skin effect characterization parameter greater than 2 as a medium-frequency and high-frequency demarcation point; adding a specific compensation item according to the loss characteristics of each frequency band, and constructing a segmented two-item model with compensation items; and fitting the parameters by adopting an L-M algorithm to calculate the total loss. According to the method, through frequency and flux density interval double division and compensation item introduction, the influence of nonlinear factors is effectively considered, and the magnetic core loss calculation precision is remarkably improved.

A high altitude electromagnetic pulse (HEMP) or other similar geomagnetic disturbance (GMD) has the potential to severely impact the operation of large-scale electric power grids by introducing low-frequency common-mode (CM) currents which deteriorate the performance of key grid components, such as large power transformers. A solid-state transformer (SST) can replace susceptible equipment and improve grid resiliency by safely redirecting, absorbing, and / or converting these CM insults.

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 application discloses a solid-state transformer fault-tolerant control system based on power unit redundancy control, comprising an input end and an output end, the input end is connected with an alternating current power grid in a star connection mode through a plurality of modular power units connected in series per phase, and the output end obtains a low-voltage direct-current bus through parallel connection of the power units. The application further discloses a solid-state transformer fault-tolerant control method based on power unit redundancy control, and solves the problems of large current impact, slow input of redundant backup units and low utilization rate of power unit redundancy in the process of switching of existing faulty power units and redundant backup power units.

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.

The invention relates to a carrier charging system applied to a solid-state transformer framework and a three-phase power supply system. The carrier charging system applied to the solid-state transformer framework is coupled with a power grid and charges a plurality of carriers, or the carriers are fed to the power grid. The charging system comprises a conversion module, a bus path, a charging module and a control unit. Wherein the conversion total capacity of the conversion module is smaller than the required total capacity of the charging module; the control unit respectively allocates a plurality of demand capacities of the charging units according to a conversion upper limit value of the conversion total capacity.

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 application relates to the technical field of new energy power supply, and provides a photovoltaic storage and charging power supply system based on a solid-state transformer and a zinc-bromine flow battery, which comprises a solid-state transformer, a photovoltaic array, a zinc-bromine flow battery energy storage unit, a lithium battery energy storage unit, a direct-current bus, a photovoltaic storage and charging interface and a cooperative controller. The two energy storage units are connected in parallel to the energy storage direct-current port of the solid-state transformer, and the rated working voltages of the two energy storage units all fall into the allowed voltage interval of the port, so that an intermediate converter is not needed. According to the load power shortage type of the computing center, the cooperative controller controls the lithium battery to preferentially respond to transient shortages, and controls the zinc-bromine flow battery to respond to continuous shortages, so that time sequence relay is realized. The application simplifies the topology, reduces the loss, has both fast response and long-time support capacity, and improves the reliability of computing power supply.

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 proposes a solid-state transformer with excellent heat dissipation, relating to the field of solid-state transformer technology. It includes: a transformer housing, with a transformer winding core inside the housing and heat dissipation fins on the outer surface of the housing; a heat dissipation mechanism inside the housing covering the surface of the transformer winding core, extending to the outside of the housing and connected to a liquid cooling device; and a liquid pressure sensor and a temperature sensor on the surface of the housing, with their detection ends extending into the interior of the housing. This invention achieves liquid cooling by placing two cooling water tanks inside the transformer housing, covering the sides of the transformer winding core, and using external connecting pipes and circulation connecting pipes to achieve liquid circulation. Simultaneously, active heat dissipation holes are provided at the axial center of the cooling water tanks, and active heat dissipation components are installed inside these holes to increase airflow, achieving highly efficient heat dissipation.

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.

Examples of the disclosure include a power system comprising a plurality of converters configured to receive DC power, the plurality of converters including a plurality of primary windings and a plurality of secondary windings, wherein each primary winding of the plurality of primary windings is coupled in series, and each secondary winding of the plurality of secondary windings is configured to be coupled to at least one load.

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.