306 results about "High power output" patented technology

The invention belongs to the technical field of large-depth ground-to-air electromagnetic detection, and particularly relates to a light-weight high-power ground-to-air electromagnetic detection power supply system and method and a high-power vehicle-mounted power supply. Two paths of lithium battery units connected in parallel are adopted to provide short-time high-power emission current for a transmitter; the controller is used for acquiring a detection task set by the transmitter and setting a reference voltage according to the detection task; the voltage acquisition module is used for acquiring a direct-current bus voltage and comparing the direct-current bus voltage with a reference voltage to obtain a current modulation signal; and the controller is also used for acquiring the output current of each path of lithium battery unit and outputting a control signal according to the current modulation signal to compensate the output current of each path of lithium battery unit. According to the invention, the stability of a power supply system is realized when different instantaneous high-power outputs in a detection task in a high-power ground-air electromagnetic detection system are realized. When the output voltage and the sudden increase or decrease of the load current are adjusted as required, the stable output of the power supply voltage is realized.

A power tool is provided including a power supply interface receiving a removable battery pack, a brushless direct current (BLDC) motor including a rotor and a stator, and a multi-phase inverter bridge circuit. A controller is provided to output drive signals to the inverter bridge circuit to control flow of current from to the motor, where each drive signal is activated within each corresponding phase of the motor within a conduction band. The controller is configured to control a length of the conduction band at a variable value within a first torque range below a torque threshold and at a substantially constant value within a second torque range above the torque threshold. The torque threshold is greater than approximately 1 Newton-meters and the motor produces a maximum power output of at least approximately 1250 watts at the torque of approximately 1 Newton-meters.

The invention discloses a control method and system of a high-power optical fiber amplifier, and relates to the technical field of optical fiber amplifiers, and the high-power optical fiber amplifier comprises a first-stage gain unit and a second-stage gain unit which are sequentially arranged along the transmission direction of light; the control method of the high-power optical fiber amplifier comprises the following steps: starting the high-power optical fiber amplifier according to a starting sequence of firstly starting a first-stage gain unit and then starting a second-stage gain unit; and closing the high-power optical fiber amplifier according to a closing sequence of firstly closing the second-stage gain unit and then closing the first-stage gain unit. According to the control method and system, the optical fiber amplifier can be controlled to realize relatively high power output, so that the optical fiber amplifier is suitable for being applied to a hollow-core optical fiber transmission system, the high-power optical fiber amplifier can be prevented from generating a huge reverse ASE signal to burn an optical path device under the condition of no input optical signal, and the application safety and reliability of the optical fiber amplifier are improved.

The invention provides high-activity contact type silver powder for photovoltaic conductive silver paste, a preparation method of the high-activity contact type silver powder and the photovoltaic conductive silver paste, and belongs to the technical field of photovoltaic materials. The high-activity contact type silver powder comprises net-shaped polycrystalline spherical silver powder and an active layer wrapping the surface of the net-shaped polycrystalline spherical silver powder. Wherein the reticular polycrystalline spherical silver powder is a spherical aggregate formed by stacking and self-assembling flaky particles with the particle size of 200-600 nm, and the reticular polycrystalline spherical silver powder is of a porous structure; and the active layer is an organic amine compound. The silver powder disclosed by the invention has good conductivity after being sintered, the adhesive force of a fine grid is relatively high, and the assembly has relatively high power output.

The invention discloses a wind power plant power dynamic optimization method and system based on spectral clustering partition, and the method comprises the steps: building a long-time scale wind power plant power maximization steady-state optimization problem based on an engineering wake flow model according to the average wind speed and wind direction, and solving an optimal yaw angle; calculating a wake flow coupling relation of the wind power plant in the current wind direction according to the optimal yaw angle to construct a wake flow diagram; clustering the wake flow diagram based on a spectral clustering method, and dividing the wind power plant into a plurality of sub-regions; and constructing a short-time scale wind power plant power dynamic optimization problem with optimization targets including maximum wind power plant total power and minimum wind turbine generator thrust fluctuation for different subareas, and solving the short-time scale wind power plant power dynamic optimization problem to obtain the optimal control quantity of each generator. The wind power plant maximum power output optimization method aims at overcoming the defects of a traditional static optimization strategy in a dynamic environment, and the overall generating capacity of the wind power plant is dynamically improved.

The invention provides an electro-hydraulic composite rotation control system, and relates to the technical field of hydraulic transmission, the system combines the speed control advantage of motor driving and the high power density characteristic of hydraulic driving, and the stability, high efficiency and high power output in the rotation process are considered; the system mainly comprises a driving motor, a main pump, a four-quadrant pump / motor and other components, dynamic response and closed-loop control between the motor and the hydraulic pump / motor are achieved through an electro-hydraulic composite coordination control strategy and an optimal torque distribution algorithm based on a genetic algorithm, the starting and braking time is effectively shortened, and the rotation efficiency is improved. In the rotary braking process, kinetic energy is converted into hydraulic energy or electric energy to be stored through the energy recovery function of the four-quadrant pump / motor and the electric power generation all-in-one machine, and the energy recovery efficiency is improved. In addition, the system has the capability of outputting torque by assisting the four-quadrant pump / motor under special working conditions, and the adaptability and stability of the system are further enhanced.

The utility model provides a single-stage bridgeless conversion device integrating a Buck-Boost circuit and a full-bridge LCC circuit. The single-stage bridgeless conversion device comprises the bridgeless Buck-Boost circuit and the full-bridge LCC circuit. The Buck-Boost circuit comprises three switching tubes Q1, Q2 and Q3, and one of the switching tubes Q3 is multiplexed as an upper tube of the full-bridge LCC circuit. The Buck-Boost circuit is provided with three MOS (Metal Oxide Semiconductor) tubes, so that one MOS tube can be multiplexed as a switch tube Q3 of the LCC circuit. The MOS tubes Q1 and Q2 serve as input rectification MOS tubes to replace diodes, the loss can be obviously reduced, the efficiency can be improved, meanwhile, the voltage stress is equal to the input voltage, the MOS tubes can select 500V MOS tubes with high cost performance, two power diodes are omitted in a main loop, and meanwhile the full-bridge LCC can achieve higher power output and can be wider in application range.

The invention belongs to the technical field of carbon nanomaterials, and particularly relates to a highly graphitized carbon tube grid of a scaffold-like structure and a preparation method and application of the highly graphitized carbon tube grid. The preparation method comprises the following steps: taking aluminum oxide with interconnected pore channels inside as a template, and obtaining a three-dimensional interconnected nickel nanorod grid film through an electro-deposition method; by utilizing the catalytic graphitization property of metal nickel and regulating and controlling parameters of acetylene when the acetylene is decomposed on the surface of the metal nickel, the problem that three-dimensional highly-graphitized carbon with controllable morphology and size cannot be synthesized due to nickel deformation caused by a catalytic mechanism is solved, and the highly-graphitized carbon tube grid with a scaffold-like structure is obtained; and the crystallinity of the carbon tube grid film is effectively improved at a relatively low temperature. The preparation process is simple, feasible and environment-friendly, and equipment is low in cost and common. A smooth ion transport channel provided by the vertical carbon tube array and a rapid electron conduction network provided by the highly graphitized interconnected carbon tube structure are expected to be used in the fields of alternating current filtering, high power output and the like.

The invention discloses a variable switching frequency-based power enhancement method for a network-constructing type converter under a dynamic state of a power grid, and relates to the field of network-constructing type converter control. According to the method, the power module loss and thermal network model is constructed, the junction temperature of the power device of the network-forming type converter is estimated to keep the junction temperature unchanged, the relation model of the power reference value and the switching frequency of the converter is established, and the power-switching frequency relation model is looked up after the power reference value is obtained through the network-forming algorithm during the dynamic period of the power grid. And obtaining the switching frequency corresponding to the current power reference value for underclocking operation, thereby reducing the switching loss of the power module, and ensuring that the maximum power output capability of the converter is maintained under the dynamic state of the power grid until the switching frequency is reduced to the lowest amplitude limit. The method for enhancing the power of the constructed network type current converter effectively improves the voltage and frequency supporting capability under the dynamic state of the power grid.

The invention relates to the technical field of power supply, and discloses a humanoid robot modular distributed power supply system which comprises a power supply battery pack, a power management distribution board and a plurality of power utilization modules. The power utilization module at least comprises a control computing power unit, a sensing system, an upper limb joint module, a lower limb joint module and other joint modules; the power management distribution board is electrically connected with the power supply battery pack and each power utilization module. The power management distribution board comprises an MCU control unit, a DCDC power supply unit, a soft start unit, a high-power output unit and a voltage and current detection unit. Through a modular distributed power-on strategy and in combination with soft start pre-charging, voltage and current real-time detection and a regenerative braking absorption unit, voltage and current peaks generated at the moment of power-on of the capacitive high-power load are remarkably suppressed, the risk that a power device is damaged due to overvoltage and overcurrent impact is fundamentally avoided, and the reliability of the power device is improved. And the system reliability and the service life are greatly improved.

The present invention discloses an adaptive underwater low-frequency underwater acoustic transducer impedance matching device, which comprises a main control circuit, which sends a sweep frequency signal to an underwater power amplifier in a configuration stage and performs impedance matching calculation according to an electrical signal collected by an impedance detection circuit; in an adaptive operation stage, calculates an expected sound source response curve according to the transmitting power of the underwater power amplifier, obtains a power deviation in combination with the sound source signal collected by a hydrophone, obtains an impedance angle according to the electrical signal collected by the impedance detection circuit, and then performs impedance matching modification; an impedance array circuit realizes a circuit with adjustable inductance and inductance parameters to output the maximum power of the underwater acoustic transducer; in the configuration stage, the impedance detection circuit collects electrical signals of the impedance array circuit at various frequency points and transmits them to the main control circuit; in the adaptive operation stage, the electrical signals of the transmitting frequency points are collected and transmitted to the main control circuit; and an impedance switching circuit selectively connects the capacitors and inductors in the impedance array circuit by a relay according to the matching impedance of the main control circuit.

The invention discloses a storage and charging integrated device, a charging control method, a charging pile and a charging system.The storage and charging integrated device comprises an energy storage module and a charging module, the first input end of the charging module is connected with the first output end of an alternating current-direct current conversion module, and the first end of the energy storage module is connected with the second output end of the alternating current-direct current conversion module; the second end of the energy storage module is connected with the second input end of the charging module. The input end of the AC-DC conversion module is connected with an AC power grid. And the charging module is configured to perform charging output by serially connecting first charging power provided based on the working state of the AC / DC conversion module and second charging power provided by the energy storage module, and provide third charging power output by the charging module to the to-be-charged equipment for charging. Therefore, high-power output of the storage and charging integrated device can be realized based on low power provided by the alternating-current power grid, so that the cost of the storage and charging integrated device can be reduced, and the charging speed of the storage and charging integrated device is improved.

The invention relates to the technical field of new energy power generation, in particular to a high-current moisture generator under low humidity and a preparation method thereof.The high-current moisture generator comprises a first electrode, an ionized water gel layer and a second electrode which are sequentially arranged, the ionized water gel layer has a salt concentration gradient, and the work functions of the first electrode and the second electrode are different; a first electrode is uniformly coated with an ionized water gel layer added with hygroscopic salt, and then the other side of the ionized water gel layer is covered with a second electrode, so that the moisture generator with a first electrode-ionized water gel-second electrode as a basic unit is formed. The moisture generator prepared by the invention is based on the synergistic effect of the primary battery effect and moisture power generation, so that the moisture generator has large short-circuit current at low humidity, the maximum short-circuit current can reach 5mA, and the moisture generator has relatively high power output density at low humidity and has a good self-power-generation function.

The invention provides a power generation and energy storage flexible composite skin assembly, which comprises a flexible solar cell, a flexible energy storage cell and a flexible insulating substrate, and is characterized in that the flexible solar cell is arranged on the front surface of the flexible insulating substrate, and the flexible energy storage cell is arranged on the back surface of the flexible insulating substrate. The beneficial effects of the invention are that the flexible solar cell, the flexible energy storage cell, the flexible insulating substrate, the packaging layer and the management circuit are integrated in the skin structure, the advantages of light weight, flexibility, high integration and the like are realized, power supply and electric energy storage are realized, the output of the overall electrical performance of the skin assembly is improved, and the cost is reduced. The maximum power output is kept in the electrical performance output process, and the environmental adaptability and cruising ability of the unmanned aerial vehicle can be greatly improved.

The application discloses a hybrid wave energy collection device, which comprises a spherical shell assembly composed of an upper spherical shell and a lower spherical shell, a wave energy capturing module arranged in the spherical shell assembly and used for capturing multi-directional wave energy and converting the wave energy into mechanical energy, and an energy conversion module used for converting the mechanical energy into electric energy. The wave energy capturing module converts wave motion into relatively straight-line motion and variable-radius swing motion. The wave energy capturing module comprises a moving rod, a top end of which is rotatably connected with an inner wall top end of the upper spherical shell; a support assembly, which comprises an upper support, a lower support and a plurality of connecting supports, a middle part of the upper support is provided with a through hole, a center of the lower support is provided with a mounting hole, and a bottom of the lower support is provided with a connecting rod; a sliding body, which is rotatably connected with the connecting rod, a lower end surface of the sliding body is a spherical surface and is matched with an inner wall of the lower spherical shell; the moving rod passes through the through hole of the upper support of the support assembly and is embedded in the mounting hole of the lower support; and the moving rod is coincident with a central axis of the support assembly. The application has the characteristics of strong working condition adaptability, high recovery efficiency, high power output density, high space position utilization rate and stable electric energy output and can provide power supply for low-power wireless sensors and provide a reliable technical scheme for realizing self-driving of wireless sensing equipment in water areas.

The invention discloses a pressure stress passivation method, which is applied to a thin barrier gallium nitride millimeter wave device, and is characterized in that a laminated silicon nitride passivation layer with pressure stress is formed on the surface of the device through the synergistic effect of interface passivation and stress engineering, so that device passivation is realized; wherein the laminated silicon nitride passivation layer comprises an interface function layer positioned on the bottom layer and a stress modulation layer positioned on the interface function layer; the method comprises the following steps of: depositing a first layer of silicon nitride film on a barrier layer of the gallium nitride millimeter wave device under the conditions of a high-frequency source and rich silicon to form an interface function layer; and depositing a second layer of silicon nitride film on the interface function layer, and carrying out stress regulation and control in the deposition process to form a stress modulation layer with compression stress. According to the method, current collapse can be effectively suppressed, meanwhile, the breakdown voltage is remarkably improved, and finally the thin-barrier gallium nitride millimeter wave device is enabled, so that the thin-barrier gallium nitride millimeter wave device has excellent performance of high power output and high stability in a high-frequency working mode.

The utility model belongs to the technical field of aging test, and discloses a general aging test platform which comprises a frame, a plurality of transverse plates are connected between the inner walls of the two sides of the frame, two partition plates are connected between every two transverse plates, the transverse plates and the partition plates form a plurality of test cells, and the test cells are connected with the frame. Thermocouple modules are installed on the bottom sides of the interiors of the multiple test cells, clamps are installed on the tops of the thermocouple modules, a power source is installed on the bottom side of the interior of the frame, and a high-power output module is arranged on one side of the top of the frame; according to the aging test platform, the test cells, the thermocouple module, the clamp, the industrial personal computer, the thermocouple input module, the display screen and the high-power output module are arranged, so that a plurality of electronic products can be tested at the same time, the test efficiency of the aging test platform is improved, the aging test platform is convenient for operators to use, and the test cost of large-batch electronic products is reduced; and the practicability of the test platform is improved.

The invention relates to the technical field of batteries, in particular to a battery power control method and device, electronic equipment, a medium and a program product. Acquiring the current vehicle state of the target vehicle; determining an output power limit level corresponding to a target battery in the target vehicle according to the current vehicle state of the target vehicle; and controlling the output power of the target battery according to the output power limit level corresponding to the target battery. Therefore, the acceleration performance can be guaranteed while the target vehicle runs normally, short-time high-power output of the target battery in an emergency can be met, meanwhile, the experience of operation consistency and stability of a driver is guaranteed, and the comfort and safety of the target vehicle are further improved.

This invention discloses a symmetrically stacked integrated 10,000-watt GaN solid-state microwave power source system. Multiple kilowatt-level GaN power devices are integrated in an array on a stacked microfluidic heat dissipation substrate. An array-type power control unit is connected to each kilowatt-level GaN power device to drive the power devices and control radio frequency signals. A separate microwave source integration unit is connected to each kilowatt-level GaN power device to receive output signals and achieve high-power output for the entire system. The overall solution of this invention adopts a symmetrical stacking structure, symmetrically mirroring and stacking the kilowatt-level GaN power units with the microfluidic heat dissipation substrate. Power combining is performed using a separate structure, ensuring efficient heat dissipation and power output capabilities. This achieves high integration and high reliability of the 10,000-watt solid-state microwave power source, significantly reducing the size of the power source.

The invention discloses a micro-photovoltaic charging system based on an optimization algorithm, and relates to the technical field of photovoltaic power generation and energy storage. Comprising a photovoltaic cell panel which is used for obtaining real-time data of external light radiation intensity, environment temperature, main circuit current and voltage parameters, converting the real-time data into electric energy and inputting the electric energy to an MPPT controller; the MPPT controller is used for extracting power-voltage curve feature points and adjusting the working state of the system; the DC-DC converter is used for adjusting the duty ratio according to the output of the MPPT controller to realize maximum power output; the energy storage module is used for storing the generated electric energy; the charging management module is used for performing constant-current / constant-voltage charging management; and the microcontroller is used for coordinating the communication of each module. The generating capacity is greatly improved, the working state of the system is adjusted, and quick response and timely action of the system are achieved.

The utility model discloses a cylindrical metal fuel cell monomer which comprises an injection molding frame body, the whole injection molding frame body is of a cylindrical structure, the inner circumferential surface of the injection molding frame body is coated with an air film, the injection molding frame body and the air film are connected to form a liquid cavity, a threaded groove is formed in the outer circumferential surface of a top opening of the injection molding frame body and is in threaded connection with a top cover, and the top cover is in threaded connection with the injection molding frame body. An aluminum plate integrally formed with the top cover is mounted on the inner top surface of the top cover, and a positive electrode and a negative electrode are respectively reserved and mounted at the top of the top cover and the bottom of the injection molding frame body. The defects are that pipeline connection is complicated, liquid leakage at joints is easy to occur, products are scrapped due to the fact that reactants block the pipelines in the using process, and the cylindrical metal fuel cell with a laminated structure is mostly applied to low-power occasions.

According to the constant-voltage output electric ship photovoltaic power supply system based on the perturbation observation method, a photovoltaic input system comprises a photovoltaic cell module, a power converter module and a power control module; the DC boost system comprises a boost converter module and a boost control module. The energy storage system comprises an energy storage bin, a bidirectional direct-current converter module and a circuit breaker module. The power control module controls the power converter module through a maximum power point search algorithm, so that the output power of the photovoltaic cell module is maximum, and meanwhile, stable voltage output exists; the boost converter module controls the turn-on time and the turn-off time of a switch tube by changing the duty ratio of a PWM modulation signal, so that the input voltage is boosted to a higher output voltage level. According to the system, the maximum power point tracking algorithm based on the perturbation observation method is adopted to ensure that the photovoltaic cell is in the maximum power output state, and meanwhile, the output voltage is adjusted through the DC-DC converter to keep stable constant voltage output, so that the requirement of the electric ship for power stability is met.

The present invention provides a battery, comprising a positive electrode plate, a negative electrode plate, an electrolyte and a separator; the positive electrode plate comprises a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector; the negative electrode plate comprises a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector; the battery satisfies 0.45 ≤ 1000×(25p1 2 + 16p2 2 )×p3 / (c×t) ≤ 0.6. Compared with the prior art, by reasonably matching the positive electrode coating surface density, the coating porosities of the positive and negative electrodes, the separator porosity and the separator thickness, the battery prepared by the present invention has excellent energy density and can provide high-power output performance, meeting the usage requirements of EVTOL.

The invention discloses a radio frequency microwave frequency multiplier which comprises an input resonance filter network, an oscillation amplification network and an output resonance filter network, the oscillation amplification network is adopted as a core architecture, and high power and high gain in a microwave frequency band can be achieved. And meanwhile, the self-adaptive linearization feedback network is used for adjusting the linearity component of the stacked field effect transistors at the bottom layer of the self-bias negative feedback amplification network, so that the whole radio frequency microwave frequency multiplier obtains good high gain, high linearity and high power output capability.

The invention provides a leakage inductance integrated magnetic device and an assembling method thereof.The leakage inductance integrated magnetic device is provided with a plurality of transformers and a base, the transformers are connected in parallel, the base comprises a plurality of positioning clamping grooves, the transformers are assembled in the positioning clamping grooves respectively, each transformer comprises a plurality of integrated structures, and the integrated structures are connected in series; each integrated structure comprises a PQ type magnetic core structure, a framework, a primary winding and a secondary winding, each PQ type magnetic core structure comprises a first U-shaped magnetic core half body and a second U-shaped magnetic core half body, the first U-shaped magnetic core half body and the second U-shaped magnetic core half body are symmetrically closed, the framework is embedded into a central column body of the first U-shaped magnetic core half body, the primary winding is embedded into the framework in a coil mode, and the secondary winding is embedded into the central column body of the second U-shaped magnetic core half body. And the secondary winding is embedded into the central cylinder of the second U-shaped magnetic core half body in the form of a wire cake, so that the high-power output requirement of the leakage inductance integrated magnetic device is met, the electrical performance and the structural layout of the leakage inductance integrated magnetic device are optimized, and the space and the preparation cost of the whole machine are saved.

The invention relates to the technical field of atomization equipment, and provides aerosol generating equipment, a control method and a storage medium, the aerosol generating equipment at least comprises a first power supply and a second power supply, and the current output by the first power supply is larger than the current output by the second power supply; the control module is also used for determining a power supply mode of the heating body from a plurality of power supply modes in the heating process of the heating body when controlling the heating body to heat the aerosol generating substrate, and / or switching among different power supply modes according to the output of the heating body and a preset switching condition; the multiple power supply modes at least comprise a first power supply mode at least adopting a first power supply to supply power and a second power supply mode at least adopting a second power supply to supply power when the first power supply is disconnected. Different power supply modes are selected according to the output of the heating body, the output of the heating body in different periods is adapted, the high-power output of the aerosol generating equipment and the prolonging of the single-time charging endurance period can be considered, and the best experience feeling is provided for a user.

Apparatuses, systems and methods are described for optimizing power production from power generating devices by dynamically grouping the power generators. The power generating devices may be dynamically grouped into power sources according to a Maximum Power Point of the power generators, and the power output of the grouped generators may be controlled by alternatively connecting the output of the power sources. The output power may also be optimized by dynamically grouping the power generators, so that a maximum power may be generated.

The application belongs to the technical field of lithium ion batteries, and particularly relates to a silicon-carbon composite material and a preparation method and application thereof. The porous carbon material is contacted with a reaction gas to perform first chemical vapor deposition to obtain a first deposition product, the reaction gas comprising silane, a doping dilution gas and a carrier gas, wherein the doping source gas comprises diborane and / or phosphine; the first deposition product is contacted with a growth gas to perform second chemical vapor deposition to obtain a second deposition product, the second deposition product containing a graphene layer; and the second deposition product is contacted with a carbon source gas and an inert gas to perform third chemical vapor deposition to obtain the silicon-carbon composite material. The silicon-carbon composite material prepared by the application greatly improves the conductivity and structural stability of the material, so that the battery has high rate and long cycle life, and as a negative electrode material of a lithium ion battery, can meet the harsh demands of fast charging and high power output.

The invention discloses a power output control method and system, a storage medium and a program product, and relates to the field of power control. The method comprises the steps that firstly, a control system obtains the output voltage and the output current of a power supply end at the current moment, the feedback voltage of a load end and the set target voltage of the load end at the next moment, and a reference line impedance value is accurately calculated based on the difference value of the output voltage and the feedback voltage and the output current; then, the control system determines a compensation coefficient according to the voltage deviation absolute value and the current change rate; the virtual resistor compensates the direct current impedance of the line in a targeted manner, the voltage drop during continuous high-power output is reduced, the stable voltage quality of the load end is ensured, the dynamic damping characteristic is provided in the virtual inertia link, and the voltage overshoot or undershoot phenomenon easily occurring due to load sudden change is effectively inhibited; finally, the control system superposes the comprehensive voltage correction amount to the power supply reference voltage, thereby realizing fine adjustment of the power supply output voltage, and improving the reliability and quality of electric energy supply.

A high-power and efficient gas expander provided by the present invention includes: a first rotor shaft and a second rotor shaft connected coaxially, and multiple stages of moving blades are provided on both the first rotor shaft and the second rotor shaft; a first expansion cylinder is sleeved on the first rotor shaft, and an air inlet / outlet communicating with the outside is provided on the first expansion cylinder, and the first rotor shaft rotates in the first expansion cylinder to output work; a second expansion cylinder is sleeved on the second rotor shaft, and an air inlet / outlet communicating with the outside is provided on the second expansion cylinder, and the second rotor shaft rotates in the second expansion cylinder to output work; multiple stages of nozzle rings are provided in both the first expansion cylinder and the second expansion cylinder, and the nozzle rings and the moving blades are arranged alternately. The double-cylinder and single-shaft system structure of the present invention realizes multi-stage expansion, achieves a greater power output, has a large power density and a low unit power cost; the high-power output enables the rotational speed of the shaft system to directly meet the requirements of the grid frequency, eliminating the need for a gearbox to change the output rotational speed, reducing mechanical energy loss, and having a high energy conversion efficiency.