172 results about "Solid state transformer" patented technology

The invention provides a power system optimization control method and device based on power market transaction. The method comprises the following steps: acquiring real-time electricity price fluctuation data, load demand prediction data and dynamic topology connection data between power grid nodes; generating a simplified network structure adaptive to a transaction scene based on the data, and adjusting an equivalent impedance parameter of a key transmission path in real time; a node voltage amplitude and a phase angle are cooperatively regulated and controlled through a multi-stage regulation mechanism of the solid-state transformer, and a power distribution scheme is formed; monitoring operation data of the solid-state transformer in real time by utilizing an edge computing node, and generating a local control instruction by combining the current equivalent impedance parameter; and carrying out space-time mapping matching on the local instruction and the electricity price fluctuation data, generating a combined control strategy through collaborative priority ranking, and dynamically adjusting a power distribution scheme. According to the technical scheme provided by the invention, collaborative optimization of economical operation and physical transmission performance of the power system is realized.

The invention discloses a solid-state transformer seamless fault-tolerant control method based on cascaded H-bridge pre-charging, and the method comprises the steps: carrying out the pre-charging of a bus capacitor of a redundant unit module based on a cascaded H-bridge, dynamically adjusting the modulation wave of a preceding-stage H-bridge of each unit module, and achieving the impact-free charging of the bus capacitor of the redundant unit module. And after the pre-charging of the redundant unit module is finished, controlling a modulation wave signal and a driving pulse of a pre-stage H bridge of the redundant unit module to intermittently charge a bus capacitor of the redundant unit module. According to the invention, the problems of long charging time of the redundant unit module, overload of the residual unit module and overlarge current impact of the alternating current inductor in the process of removing the fault unit module and inserting the redundant unit module in the cascade converter are solved. According to the method, no additional circuit needs to be added, the method is suitable for a power bidirectional flow and unidirectional flow system, quick and smooth switching of the unit modules can be achieved when a fault occurs, and reliable and stable operation of the whole system is guaranteed.

Embodiments of the present disclosure provide a solid-state transformer in-grid operations and maintenance circuit and a method therefor, a controller, and a storage medium. The solid-state transformer in-grid operations and maintenance circuit comprises solid-state transformer units, input side switches, output side switches, and an auxiliary energy charging loop; the input side of each solid-state transformer unit is connected to an input bus, and the output side is connected to an output bus; the input side switches are arranged on the input sides of the solid-state transformer units, and the output side switches are arranged on the output sides of the solid-state transformer units; one solid-state transformer unit corresponds to one input side switch and one output side switch; and a voltage output end of the auxiliary energy charging loop is connected between the solid-state transformer units and the output side switches. When a solid-state transformer unit needs to be maintained or replaced, the input side switches and the output side switches of some of the solid-state transformer units can be disconnected, and since the decrease in system capacity is small, the system can still operate normally; additionally, the solid-state transformer units are charged by means of the auxiliary energy charging loop, so that the inputs and outputs of the units are restored in a surge-free manner.

The invention provides a solid-state transformer. The solid-state transformer comprises a first-stage circuit, a first direct-current bus and a second-stage circuit, the first-stage circuit structure is used for receiving alternating-current electric energy and converting the alternating-current electric energy into first direct-current electric energy. The first DC bus is electrically connected to first DC electric energy. The second-stage circuit is electrically connected to the first-stage circuit through a first DC bus, and is configured to perform isolated step-down DC / DC conversion on the first DC electric energy to generate second DC electric energy. The first stage circuit is configured to operate with a modulation index greater than 1, and the modulation index is defined as a ratio of twice an AC voltage provided by the AC power to a voltage on the first DC bus.

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.

The embodiment of the invention provides a solid-state transformer on-network operation and maintenance circuit and method, a controller and a storage medium, the solid-state transformer on-network operation and maintenance circuit comprises a solid-state transformer single body, an input side switch, an output side switch and an auxiliary energy charging loop, the input side of the solid-state transformer single body is connected to an input bus, and the output side of the solid-state transformer single body is connected to an output bus; the input side switch is arranged on the input side of the solid-state transformer monomer, and the output side switch is arranged on the output side of the solid-state transformer monomer; one solid-state transformer monomer corresponds to one input side switch and one output side switch; and the voltage output end of the auxiliary energy charging loop is connected between the solid-state transformer monomer and the output side switch. When the solid-state transformer single bodies need to be maintained or replaced, the input side switches and the output side switches of part of the solid-state transformer single bodies can be disconnected, and the system can still operate normally due to the fact that the decrease degree of the system capacity is small. In addition, the solid-state transformer single body is charged through the auxiliary charging loop, so that the input and output of the single body are recovered without impact.

The invention provides a compact medium / low-voltage AC / DC solid-state transformer based on an MMC midpoint embedded sub-module. The compact medium / low-voltage AC / DC solid-state transformer comprises a low-voltage DC port, a three-phase DC / AC converter, a three-phase circuit topology and a medium-voltage AC port, the three-phase circuit topology comprises three same single-phase lines, and each single-phase line comprises an upper bridge arm, an upper bridge arm inductor, an embedded module, a lower bridge arm and a lower bridge arm inductor. The embedded module comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a direct-current capacitor and a high-frequency transformer. According to the solid-state transformer, by introducing one embedded module, the number of high-frequency transformers of a traditional solid-state transformer is reduced to only one high-frequency transformer for each phase, and the size of the solid-state transformer is greatly reduced; as the upper and lower bridge arms can generate high-frequency voltage pulses, high-frequency pulse voltage generated by the embedded module can be eliminated. Therefore, the high-frequency pulse voltage output by the embedded module does not deteriorate the circulating current of the bridge arm.

The invention discloses a multifunctional charging pile system based on a solid-state transformer. The multifunctional charging pile system comprises an energy input module, an energy conversion module, an energy storage module and a charging output module. According to the multifunctional charging pile system based on the solid-state transformer, the direct-current solid-state transformer and the low-voltage DC / DC converter are adopted as core components of the energy conversion module, and the direct-current solid-state transformer works cooperatively through the filter inductor, the half-bridge module and the DC-DC isolation type converter; the half-bridge module is formed by connecting two full-control type switching devices in series, the two ends of the half-bridge module are connected with reverse diodes in parallel, high efficiency and stability in the conversion process are ensured, the resonant frequency of the LC series resonance link is 20 kHz, the daily operation cost is minimized, and the SOC state of the storage battery is monitored in real time, so that high-voltage direct current and low-voltage direct current are effectively isolated and converted. The charging and discharging process is accurately controlled, the charging and discharging efficiency is ensured to reach 92% or above, and the energy utilization efficiency is further improved.

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.

A power conversion system (1) comprises a rectifier circuit (11) for converting an AC voltage to a distribution bus voltage; a solid state transformer, SST, (30) having an input side DC link (20), an internal medium frequency AC link (502), and an output side DC link (535 ), the SST (30) being configured for converting between the distribution bus voltage on the input side (501) and a DC target voltage on the output side (503), the SST (30) including at least one medium frequency transformer, MFT (511), in the AC link (502) for galvanic isolation, wherein the SST (30) includes multiple solid state transformer, SST, cells interconnected on the input side (501), the interconnection including a parallel connection, a series connection, or a combination thereof.

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.

This application provides a fault handling system of a solid-state transformer, including a first power unit and a second power unit that are cascaded and connected. The first power unit includes a first auxiliary supply, a first control module, and a first communication module. The first auxiliary supply and the first control module are both electrically connected to two ends of a first busbar capacitor. The first control module is configured to detect a voltage of the first busbar capacitor. The second power unit includes a second auxiliary supply and a second control module. The second auxiliary supply and the second control module are both electrically connected to two ends of a second busbar capacitor. The first communication module outputs fault information to the second control module when the first control module detects that the voltage of the first busbar capacitor is greater than a threshold.

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.