302results about How to "Simple and reliable control process" patented technology

The invention discloses a diameter-variable wheel for automatically adapting to a road surface, which comprises a plurality of outer wheel blades, a plurality of inner wheel blades and a plurality of connecting rod wheel blades; middle parts of the plurality of inner wheel blades are respectively provided with a telescopic strut bar fixed on a circumference of a central wheel hub; end faces on two sides of the central wheel hub are provided with a plurality of crank-slider mechanisms connected with the inner wheel blades, and are provided with a driving device for driving the plurality of crank-slider mechanisms; and one ends of connecting rods of the crank-slider mechanisms are connected with the inner wheel blades through revolute pairs, and the other ends of the connecting rods of the crank-slider mechanisms are connected with cranks through revolute pairs. The diameter-variable wheel solves the contradiction between wheel obstacle-surmounting performance and volume structure restraint, effectively improves the adaptability of the wheel, and solves the problems of the conventional wheels in the environments of underground, planetary surfaces or other comprehensive road surfaces. The wheel controls a servo motor to drive the cranks to rotate a certain angle, and the crank-slider mechanisms parallelly drive the inner wheel blades to radially expand or contract, so that the wheel diameter is continuously variable. The diameter-variable wheel can realize diameter-expanded obstacle surmounting, walking obstacle surmounting, tolerance obstacle surmounting and the like, and the adaptability and the flexibility of the wheel for different road surfaces are enhanced.

A method for the simultaneous graphical display of paths of optical wavelength channels in a telecommunications network together with one or more channel attributes is provided. The graphical display of the network also shows the direction of data flow transported by the channels. An audible or visual alarm for an error condition for a channel attribute on a link in the network can be produced if requires. The operator can also obtain detailed information on a channel by positioning the mouse over a channel.

The invention discloses an AC / DC decoupling control method of a modular multi-level current converter. The method comprises the steps of adding DC current control in current inner-loop control so that current inner-loop control comprises AC current control and DC current control, thereby using output of the AC current control and output of the DC current control as main components of an output voltage reference value of each phase leg of the modular multi-level current converter; respectively controlling reference values of the AC current control and the DC current control, and simultaneously controlling outputs of the AC current control and the DC current control, thereby realizing control on main components, and furthermore preventing current converter locking because of a leg overcurrent in DC fault. The invention further discloses application of the method in a flexible DC power transmission system. The AC current and the DC current of each current converter station and capacitance and voltage of each submodule are controlled into a safe range, thereby realizing DC fault crossing of the flexible DC power transmission system.

The invention discloses an electric scooter. The electric scooter comprises a motor base, a left motor wheel, a right motor wheel, a left pedal, a right pedal and circuit boards; the left motor wheel and the right motor wheel are installed on the left side and the right side of the motor base respectively, the left pedal and the right pedal are rotatably installed on the motor base and rotate front and back relative to the motor base, and the circuit boards are used for sensing the rotating angles of the corresponding pedals and controlling work of the corresponding motor wheels according to the rotating angles of the pedals. According to the electric scooter, only one motor base is supplied, the structure strength is high, the reliability is good, and the bearing strength can be effectively guaranteed; through the left pedal and the right pedal which are rotatably installed on the motor base, the circuit boards can control the work of the corresponding motor wheels according to the rotating directions and the rotating angles of the left pedal and the right pedal, advancing, retreating and turning are completely controlled through feet in the driving process of a driver, and the intentions and behaviors of people are highly combined and are approximately consistent with those of people in walking.

A method for the simultaneous graphical display of paths of optical wavelength channels in a telecommunications network together with one or more channel attributes is provided. The graphical display of the network also shows the direction of data flow transported by the channels. An audible or visual alarm for an error condition for a channel attribute on a link in the network can be produced if requires. The operator can also obtain detailed information on a channel by positioning the mouse over a channel.

An electric vehicle driving motor controller with a charging function is characterized by comprising a three-phase bridge-type DC-AC bidirectional converter, a first relay switch, a second relay switch, an AC power supply input interface device, a driving motor, a voltage reduction transformer, a charging power battery and a central control microprocessor. The electric vehicle driving motor controller and the control method thereof have advantages of concise circuit structure, effective number reduction of electrical elements, higher operation reliability, low cost, small weight, small size and high power factor.

The invention relates to a three-friction stepper for juxtaposedly pushing double piezoelectrics and a scanning probe microscope thereof, in particular to a piezoelectric locator comprising two piezoelectrics, a base and slide bars, wherein the two piezoelectrics which are parallel in the telescopic direction are juxtaposedly fixed and elevated on the base; the slide bars which are in sliding match with the two piezoelectrics in the telescopic direction are provided; positive pressures which enable the slide bars and the free ends of the two piezoelectrics as well as the slide bars and the base to be pressed are arranged in the telescopic direction vertical to the two piezoelectrics; in the largest breakout friction to the slide bars, which is generated by the three positive pressures, any largest breakout friction is smaller than the sum of other two frictions; the slide bars press the base and the free ends of the two piezoelectrics through elastic force or electromagnetic force, the two piezoelectrics can be arranged integrally, and a piezoelectric scanatron fixed on the base is coated outside the stepper, thus a scanning probe microscope body which can work in a small space is formed. The invention has small size, simple and firm structure, and large working temperature zone and driving force, is suitable for various extreme physical conditions and approaches an ideal stepper.

The invention discloses an unmanned aircraft rolling flattening control method based on sideslip correction method, which is characterized in that a intrinsical sideslip correction method is improved by introducing an aileron controlled variable of unmanned aircraft rolling flattening control time Delta x0, according to the formula, the unmanned aircraft is processed with rolling flattening control using Delta x=Krr+Kw number-[x]Omegax+ Delta xo. The invention is particularly suitable for the unmanned aircraft control which has high requirement to landing rolling flattening while the side wind is strong. The aileron controlled variable in rolling flattening accessing time is only needed to record applying the control method of the invention, and the flattening control can be realized; the control process is simple and reliable; the airplane can be grounded in smaller roll angle; in the same side wind situation, the unmanned aircraft can be landed in near zero degree by applying the control method in the invention, which can greatly increase the landing safety of unmanned aircraft.

The invention discloses an electronic commutation brushless direct current and single phase fan circuit and a control method thereof. The electronic commutation brushless direct current and single phase fan circuit comprises an alternating current rectifying circuit, a switching power supply, an inverting commutation circuit, rotor-position sensor, a current sampling circuit and a controller, wherein the switching power supply is used for supplying power to a motor and the switching power supply, the switching power supply is used for generating low-voltage power supply and supplying the low-voltage power supply to an external component, the inverting commutation circuit is used for controlling motor current alternation, the rotor-position sensor is used for supplying the position information of the current rotor, the current sampling circuit is used in winding current feedback, and the controller is used for fulfilling motor commutation and circuit regulation. The electronic commutation brushless direct current and single phase fan circuit and the control method thereof have the advantages that due to the fact electronic switch components are adopted, the motor is quiet and reliable in commutation processes without any mechanical movement. Due to the fact that permanent magnet rotors are adopted, the magnet winding of an ordinary direct current motor is not needed, and loss is reduced. In addition, the whole circuit and the control method of the circuit are simple and reliable, and the performance and reliability of a whole machine are improved.

The invention relates to a branch air volume self-adjustment based air volume control system which comprises a branch electric air valve, a branch air speed and air pressure sensor and a branch controller. The branch electric air valve is mounted on a branch of an air pipe and used for adjusting air volume of the branch; the branch air speed and air pressure sensor is mounted on the branch and used for collecting the given air volume, calculating current actual air volume of the branch according to air speed and air pressure, detected by the branch air speed and air pressure sensor, of the branch and the pipe diameter of the branch, and adjusting openness of a branch electric air valve by the aid of a continuous adjusting control method so as to enable the air volume of the branch can reach the given air volume. The branches of the air pipes have air volume self-adjusting capacity, so that the air volume of dust absorption spots do not rely on pipeline characteristics and station changes of the whole pipeline. Compared with the prior art, the branch air volume self-adjustment based air volume control system has the advantages that the system is simple and reliable, difficulty in implementation is low, and universality is greatly improved.

The invention discloses a variable-frequency multi-connected air conditioning unit self-adaptive control device. An outdoor unit control system comprises an air suction pressure sensor (1), an exhaust pressure sensor (2), six temperature sensors and an outdoor control panel, wherein each indoor unit control system comprises four temperature sensors, an expansion valve (16) and an indoor control panel. The invention also discloses a variable-frequency multi-connected air conditioning unit self-adaptive control method. The air suction pressure sensor (1), the exhaust pressure senor (2) and the six temperature sensors collect pressure parameters and temperature parameters of outdoor units for calculation, and after the four temperature sensors collect temperature signal parameters of the indoor units, and he self-adaptive regulation on indoor loads can be realized.

The invention discloses a device and a method for the harmonic impedance measurement of a micro-grid. The device comprises a harmonic current source injection device, a harmonic voltage and harmonic current detection device, a data acquisition device and an upper computer, wherein the harmonic current source injection device is used for injecting harmonic current into the grid; the harmonic voltage and harmonic current detection circuit is used for detecting the magnetic harmonic voltage and harmonic current in the grid before and after the harmonic current is injected into the micro-grid; the data acquisition device is used for sampling a signal detected by the harmonic voltage and harmonic current detection circuit, and transmitting data to the upper computer; the upper computer is used for processing the sampled signal, calculating the variations of the harmonic voltage and the harmonic current, and calculating the harmonic impedance of each part of the micro-grid. According to device and the method, harmonic current of which the amplitude, frequency, phase and waveform can be controlled can be injected into the grid through the harmonic current source injection device, so that the harmonic impedance measurement accuracy of the grid is improved.

The invention discloses a duplex planetary gear train torque directional distribution electric drive axle. The drive axle comprises a main drive motor, a TV control drive motor and a duplex planetarygear train, wherein a power output shaft of the main drive motor is connected with a gear ring of a two-stage planet gear planet row differential mechanism; a sun gear of the two-stage planet gear planet row differential mechanism is connected with a first axle shaft, and a planet carrier of the two-stage planet gear planet row differential mechanism is connected with a second axle shaft; the duplex planetary gear train comprises a first sun gear, a second sun gear, a first end planet gear, a second end planet gear and a first planet carrier; the first sun gear is connected with the first axleshaft, and the second sun gear is rotationally supported on the first axle shaft and connected with the planet carrier of the two-stage planet gear planet row differential mechanism; and the first end planet gear and the second end planet gear are coaxially arranged on a planet shaft, and the planet shaft is connected with a power output shaft of the TV control drive motor through the first planet carrier. Torque directional distribution of wheels on the two sides can be achieved without a clutch, and the structure is simple.

The invention provides a valve control type semi-active oscillating damper. The valve control type semi-active oscillating damper comprises an oil cylinder component and an extra-cylinder component which is positioned on the outer side of the oil cylinder component, wherein the oil cylinder component comprises a guide bearing, an oil cylinder and a bottom valve seat which are fixedly connected with one another in turn; an oil storage tank is arranged outside the oil cylinder, and a piston and a piston rod are arranged in the oil cylinder; the extra-cylinder component comprises a first switching valve, a second switching valve, a two-position three-way valve, a proportional overflow valve, a throttling valve, a throttling overflow valve, a body acceleration sensor and a controller; the body acceleration sensor is used for detecting the acceleration of a body, outputting a signal and transmitting the signal to the controller; and the controller is used for controlling the energization and de-energization states of the first switching valve, the second switching valve and the two-position three-way valve, and controlling the current intensity of the proportional overflow valve at the same time. The valve control type semi-active oscillating damper is simple in structure, can make real-time responses and provide a continuously adjustable damping force according to the state of a train during operation, and can be simply and reliably controlled.

The invention discloses a preparation method of micro-encapsulation nanometer hybridized microspheres. The preparation method comprises the following steps: propelling an oil phase and an aqueous phase containing polyvinyl alcohol (PVA) into a micro-channel of a micro-fluidic chip separately by a micro-injection pump by a liquid drop type micro-fluidic technology, collecting the formed liquid drops by an alkaline solution and placing until complete reaction, wherein the oil phase comprises a surfactant and a continuous phase matrix; the aqueous phase also comprises trivalent gadolinium salt and / or iron salt; and the iron salt is a mixture of ferric salt and ferrous salt. According to the method, the PVA aqueous phase containing the trivalent gadolinium salt and / or the iron salt is under the action of interfacial tension and oil phase shear force to obtain uniform liquid drops, the liquid drops and the oil phase enter an alkaline receiving liquid, and the PVA microspheres for encapsulating in-situ formed Gd2O3 and / or Fe3O4 nanoparticles; furthermore, the process is simple and controllable, the obtained microspheres are reasonable and uniform in particle size, important theoretical and practical value is achieved and the application prospect is wide.

The invention discloses a dual-winding synchronous control system and a dual-winding synchronous control method for a crane. The system comprises two laser distance measuring instruments which are symmetrically arranged at the two sides of a crane boom head, wherein a probe of each laser distance measuring instrument is kept vertically downward; the crane boom head is connected with a hanger below through two groups of independent speed-adjustable windings; distance measuring baffle plates extend out from the two sides of the hanger; each distance measuring baffle plate is positioned below the laser distance measuring instrument at the corresponding side; the two laser distance measuring instruments are respectively used for measuring height from the winding at the corresponding side to the distance measuring baffle plate at the side and transmitting a height signal to a controller; the controller is used for controlling the speed of the corresponding winding through a winding speed regulating mechanism. Through the laser distance measuring instruments at the two sides of head of a cantilever crane, height difference between pulleys at the two sides of hanger is obtained; by regulating the rotation speed of the windings, the height difference is reduced to guarantee that the dual windings are synchronous, so that the stability problem and the safety problem of dual-winding synchronous operation can be solved, the control is simple and reliable, and the application prospect is good.

The invention discloses an emitter with a 360-degree cradle head and a controllable trajectory direction track. The emitter comprises a ball feeding device, an emitting device, a pitching assembly with adjustable angle, the 360-degree cradle head, and a pipe connecting assembly. The ball feeding device comprises a ball cabin and a movable ball falling port; the ball cabin comprises a funnel type frame, and a plurality of ball storage channels inclinedly arranged in the frame in parallel; an infrared emission head is arranged on the higher end of each ball storage channel; the movable ball falling port comprises a linear movement mechanism and a sliding door assembly; infrared receiving head matched with the infrared emission heads are also arranged on the sliding door assembly; the emitting device is arranged on the pitching assembly; and the pitching assembly is arranged on the 360-degree cradle head rotating around a Z axis. The emitter with the 360-degree cradle head and the controllable trajectory direction track provided by the invention is economical, practical, lower in ball blockage rate, flexible and adjustable in range, emission angle and emission direction, and high in anti-interference capability of an emission curve, and can meet the requirement of tennis emission in any angle and range in a 360-degree direction.

The invention discloses a distributed water mixing and pressurized heat supply system having a decoupling function and a design method of the system, relate to a heat supply system and a design method thereof, and aims to solve the problems of high invalid energy consumption and mutual coupling of hydraulic regimes existing in the conventional directly-connected centralized heat supply system, the problems of mutual coupling of hydraulic regimes and poor system adaptability existing in a distributed pump system, the problems of mutual coupling of hydraulic regimes and the presence of invalid energy consumption existing in the conventional water mixing system, and the problems of high invalid energy consumption and large diameter of an equalizer tank existing in an equalizer tank system. The distributed water mixing and pressurized heat supply system comprises a heat source, a heat source circulating water pump set, a water supply pipeline, a water return pipeline and three types of heat users, wherein the inlets of a first type of heat supply network users are provided with water mixing pumps and differential pressure valves; the inlets of a second type of heat supply network users are provided with water mixing pumps, booster pumps and decoupling equipment; and the inlets of a third type of heat supply network users are provided with water mixing pumps. The distributed water mixing and pressurized heat supply system is applied to heat supply systems.

The invention relates to a method and an apparatus for performing an assay on chemical, biochemical, or biological fluids. The apparatus includes an assay chamber for fluid reactions and a centrifugal force activated-valve for controlling fluid movement through the assay chamber. An active surface can be positioned in the assay chamber to react with fluids passed through the assay chamber. The active surface may contain biomolecular probes. The biomolecular probes can be DNA, DNA fragments, RNA, RNA fragments, reagents, protein, protein fragments, lipids, and lipid fragments. The apparatus is particularly useful when multiple reactions, dilutions, or washing steps are required to determine a final answer. The centrifugal force activated-valve provides positive control over fluid in the assay chamber and allows for repeated use of the same chamber for multiple reaction steps. The apparatus can be disposed of after an assay to eliminate potential contamination from reuse of the same apparatus. Fluids passed through the assay chamber may be recovered for subsequent analysis, processing, or reactions.

The invention relates to a direct effect testing device for lightning current. The testing device comprises a lightning current first return stroke component loop, a lightning current middle current component loop, a lightning current continuous current component loop, a lightning current subsequent return stroke component loop, a time sequence trigger circuit, a direct effect discharge rack and the like. According to the device, effects of simulating a complete lightning current process in nature and checking combustion, corrosion, explosion, structural distortion, strength reduction and the like caused to a tested object by high-temperature and high-pressure shock wave and electromagnetic force accompanied during attachment of lightning arc can be simultaneously produced, and each component of the lightning current can also be produced respectively for independently checking single lightning current characteristics. The testing device fills the blank about similar devices in China, and superior equipment is provided for direct effect testing of the lightning current.

The invention relates to a device for waste heat recovery based on control over outlet smoke temperature. According to the device, a smoke adjusting baffle and a bypass flue are arranged in an original flue and a temperature sensor is arranged in the flue; the bypass flue is communicated with a smoke heat exchanger and the smoke heat exchanger is connected with a steam pocket; the steam pocket is communicated with an air heat exchanger in an air side flue through a saturated steam output pipe and the air heat exchanger is further communicated with the steam pocket through a condensate water input pipeline so that circulation can be formed; a condensate water circulation pump is arranged on the condensate water input pipeline; a liquid level sensor is arranged on the air heat exchanger; the steam pocket is provided with a steam pocket pressure sensor. The outlet smoke temperature is controlled by the adjusting baffle, smoke is shunted by the adjusting baffle, and therefore it is guaranteed that the temperature of the discharged smoke is stabilized at a set value; according to control over the steam pressure of the steam pocket, the backflow speed of condensate water is controlled to control the heat exchange area of a heat exchange system, and therefore control over the heat exchange power of the heat exchangers is achieved.

The invention discloses an alternating-current servo control system with a single driver and multiple motors, belonging to the technical field of medical apparatus and instruments. The alternating-current servo control system mainly comprises a motor control part, a motor driving part, a motor switching part and a motor, wherein the motor control part comprises a user interface circuit, a single-chip microcomputer processing circuit, a motor control output circuit and a storage circuit; and the motor driving part comprises an external interface circuit, an auxiliary processor circuit, a main processor circuit, a storage circuit and a power conversion output circuit. A control instruction of a user end or a former control circuit is received by the motor control part, the control instruction and a motor selection instruction are sent to the motor driving part after identification is carried out, and finally, the motor driving part controls the motor. With the adoption of the alternating-current servo control system disclosed by the invention, a plurality of alternating-current servo motors are driven by an alternating-current servo driver, so that the cost is saved, medical apparatus and instruments can be automatically controlled, and the alternating-current servo control system can be applied to controlling servo systems in other fields.

The invention relates to a sizing material formulation for manufacturing an automobile constant velocity universal joint seal cover, which takes chloroprene rubber as the main component and comprises the following component PHR (namely the adding quantity relative to 9,000 grams of the chloroprene rubber): 9,000 grams of the chloroprene rubber (domestic CR322), 1,000 grams of nitrile-butadiene rubber (N220S), 1,000 grams of semi-reinforcing furnace black, 1,000 grams of high abrasion furnace black, 1,000 grams of spray carbon black, 500 grams of titanate powder, 1,000 grams of zinc oxide, 1,000 grams of white carbon black, 1,500 grams of dioctyl sebacate, 500 grams of butyl oleate, 400 grams of magnesium oxide, 200 grams of 4010NI anti-aging agent, 90 grams of NA-22, 50 grams of TMTD, 66 grams of paraffin, 50 grams of stearic acid and 13 grams of sulfur, wherein the total weight is 18,369 grams. The quantity of the formulation can be increased and decreased in proportion. The automobile constant velocity universal joint seal cover prepared according to the sizing material formulation has the advantages of good low temperature resistance, low brittle temperature, good comprehensive performance and long service life.

The invention discloses a harmonic injection device for the harmonic impedance measurement of a power grid. The device comprises a power grid voltage feedback circuit, a signal generation circuit, an amplitude amplification circuit, a power amplification circuit and an interface circuit, wherein the power grid voltage feedback circuit is used for detecting a voltage signal of the power grid, and filtering and inputting the voltage signal to the signal generation circuit; the signal generation circuit is used for synthesizing a harmonic voltage waveform, harmonic voltage frequency, harmonic voltage amplitude, a harmonic voltage waveform phase difference and the phase information of the acquired voltage signal, and generating and outputting a harmonic voltage signal; the amplitude amplification circuit is used for amplifying and outputting the amplitude of the harmonic voltage signal output by a DSP (digital signal processor); the power amplification circuit is used for performing power amplification on the harmonic voltage signal output by the amplitude amplification circuit, and outputting the harmonic voltage signal to the interface circuit; the interface circuit is used for converting the input harmonic voltage signal into a harmonic current signal, and injecting the harmonic current signal into the power grid. According to the harmonic current injection device, harmonic current of which the amplitude, frequency, phase and waveform can be controlled can be injected into the power grid, so that the harmonic impedance measurement accuracy of the power grid is improved.

The invention discloses a preparation method of a black zirconia ceramic. The preparation method solves the problem that a black pigment of the existing black zirconia ceramic has poor high temperature performances so that performances of a black zirconia ceramic fished product are reduced. The preparation method comprises grinding the black pigment and zirconia powder as raw materials, mixing the powder, molding the mixed powder, and carrying out calcining to obtain the black zirconia ceramic. The black pigment is prepared from lanthanum oxide, calcium oxide, chromium oxide and alumina through grinding, mixing, calcining and crushing. A mole ratio of lanthanum oxide, calcium oxide, chromium oxide to alumina is (1-x): x: (1-y): y, wherein x is greater than 0 and less than or equal to 0.4 and y is greater than 0 and less than or equal to 0.5. The preparation method has the advantages of simple process, low production cost and environmental friendliness. The black zirconia ceramic has excellent performances such as high temperature performances.

A hybrid drive device including an electric motor; an automatic transmission; a first oil passage; and a second oil passage branched from the first oil passage and that guides the oil to a friction element that is engaged for establishment of a speed in the automatic transmission. An orifice is provided in the first oil passage downstream of the second oil passage. A switching valve for the friction element is provided in the second oil passage to be switched between communicated and blocked states. A hydraulic servo for the friction element is supplied with a hydraulic pressure to control the friction element between engaged, disengaged, and slip states. The switching valve includes a control oil chamber that communicates with the hydraulic servo, and is switched into the blocked state when the friction element is disengaged and into the communicated state when the friction element is engaged or the slip state.

The invention discloses a new energy output simulation application system and a simulation method thereof. The system comprises an AC / DC (Alternative Current / Direct Current) rectification module, a direct current voltage-stabilizing module, a DC / AC inversion module, an isolating transformer, an upper-layer central controller and a bottom-layer unit controller, wherein the AC / DC rectification module and the direct current voltage-stabilizing module are used for simulating a direct current voltage supply; and the DC / AC inversion module is used for simulating new energy output or independent power supply output. The method comprises the following steps that: the power curve value of the new energy is received by using the upper layer central controller, or after receiving a new energy representation index, a corresponding power curve value is obtained through calculation, and a scheduling management signal is transmitted; and the scheduling management signal is received by the bottom-layer unit controller in real time so as to realize the fixed power control, the constant voltage constant frequency control or the sag control. According to the system and the method, the upper-layer central controller is used for coordinating and managing the bottom-layer unit controller, so that the bottom-layer unit controller can power in accordance with an appointed power curve; the investment cost is low; the construction period is short; the operation is simple and flexible; and the system and the method can be widely used in experiment systems for simulating the power of distributed power supplies such as wind energy, photovoltaic energy and energy storage.

The invention discloses a control method of a high-power electrolytic hydrogen production rectification power supply. The control method comprises the following steps of: acquiring a zero crossing point of a-phase power grid voltage ua by using a phase-locked circuit, calculating a power grid period in real time by a DSP control circuit according to the zero crossing point of the a-phase power grid voltage ua, and acquiring a power grid reference phase; respectively sampling an input current value of a three-phase LC filter, a direct current side output current value of a three-phase current source type PWM rectifier and a direct current side output current value of a multi-pulse thyristor rectifier by using a current Hall sensor; and employing the DSP control circuit to carry out control calculation according to the values, adopting a PI controller to control the output current of the multi-pulse thyristor rectifier, and adopting the PI controller and a repetitive controller to control the direct current side output current value of the three-phase current source type PWM rectifier. According to the control method, the output power is large, the hydrogen production efficiency is high, the output current can be flexibly adjusted in a large range, and the system is stable and reliable.