27results about How to "Reduce circulation" patented technology

The turbocharger comprises a turbine shaft (1), a turbine (2) is arranged at the output end of the turbine shaft (1), a middle body (3) is arranged on the side, close to the turbine shaft (1), of the turbine (2), the turbine shaft (1) is rotationally connected to the axis of the middle body (3), an air cooling air channel (3.1) is arranged at the end, close to the turbine (2), of the middle body (3), and the air cooling air channel (3.1) is communicated with the air cooling air channel (3.1). The air cooling air channel (3.1) is in a U shape and is arranged in the circumferential direction of the turbine shaft (1). The utility model provides a turbocharger with an air cooling intermediate, which is used for cooling the turbocharger in an air cooling manner so as to reduce the production cost of the turbocharger.

The present application belongs to the field of metallurgy, and particularly relates to a method for stopping blast furnace and lowering material surface, comprising the following contents: (1) adjusting the furnace operation before stopping; (2) adjusting the stopping material and optimizing the material distribution matrix; (3) pre-turbine, replacing the tuyere small sleeve and controlling the furnace top temperature; (4) stopping and lowering the material surface: 1. increasing the ratio of top pressure and hot blast pressure: the ratio of top pressure and hot blast pressure is increased to 0.68-0.75; 2. taking different degrees of control on the top temperature when the material surface is at different positions of the blast furnace: (1) when the material surface is above 1 / 2 of the bosh, the top temperature is controlled at 320-350 DEG C; (2) when the material surface is below 1 / 2 of the bosh, the top temperature is controlled at 280-300 DEG C; 3. spraying coal powder, oxygen enrichment, increasing and continuously maintaining the nitrogen gas injection of the tuyere after stopping the coal injection; 4. controlling the gas composition; 5. controlling the [Si] of the molten iron. The method can avoid the blast furnace explosion in the process of stopping and lowering the material surface, prolong the coal gas recovery time, shorten the time of stopping and lowering the material surface, save the coke consumption and reduce the cost.

The utility model provides an expansion kettle and an automobile, and relates to the technical field of automobile heat management. The expansion kettle comprises a kettle body, a first partition structure and a second partition structure, the first partition structure is arranged in the kettle body and divides the inner space of the kettle body into at least two kettle cavities distributed in the first direction, and each kettle cavity is provided with a liquid supplementing opening; the second partition structure is arranged in the kettle cavity and divides the kettle cavity into a first cavity and a second cavity which are arranged in the second direction and communicated with each other, and the size of the first cavity is smaller than that of the second cavity. The first cavity bodies of the kettle cavities correspond to each other in the first direction, and every two adjacent first cavity bodies communicate with each other through a liquid passing opening formed in the first partition structure. The expansion kettle is applied to the automobile, the dry suction risk caused by exposure of a liquid supplementing opening in the expansion kettle when the automobile inclines leftwards and rightwards can be effectively reduced, and therefore stable operation of the automobile is guaranteed.

The utility model discloses a combination oil cylinder and injection molding machine for injection molding machine, this combination oil cylinder includes: injection oil cylinder and seat platform oil cylinder, injection oil cylinder and seat platform oil cylinder are parallel and all along first direction are established, the projection of injection oil cylinder along second direction is first projection, the projection of seat platform oil cylinder along second direction is second projection. In the utility model, first projection and second projection part or completely coincide, can reduce the space that the whole structure of injection oil cylinder and seat platform oil cylinder formed in length direction occupies, so that in the same length interval, injection molding machine can install the seat platform oil cylinder of greater stroke, and the nozzle can completely exit the template when seat platform retreats to the bottom, and maintenance is convenient.

This invention discloses a carbon-sulfur battery and its preparation method. A sulfur-carbon compound containing C-S and S-S (sulfur atom number ≤ 4) structural units is used as the positive electrode active material. In-situ pre-lithiation is performed inside the battery package to prepare the positive electrode, and a carbon-based material is used as the negative electrode active material to prepare the negative electrode. The resulting carbon-sulfur battery with the above positive and negative electrode system is further assembled. This battery utilizes the lithium fusion reaction of the sulfur-carbon compound positive electrode material and the intercalation or alloying lithium fusion reaction of the carbon-based negative electrode to achieve an electrochemical redox reaction between the positive and negative electrode systems, thereby converting chemical energy into electrical energy. The sulfur-carbon compound positive electrode material exhibits high structural stability during the lithium fusion reaction. Compared to the loss of positive electrode active material caused by soluble lithium polysulfides during the discharge of elemental sulfur positive electrodes, a positive electrode with high cycle stability can be obtained. Furthermore, by utilizing the reversible lithium intercalation / deintercalation or alloying reaction of carbon-based materials to replace the unstable and highly active metallic lithium negative electrode, high cycle stability of the negative electrode can be achieved.

The utility model relates to the technical fields of mould shrinkage pipe production especially relate to a mould shrinkage pipe production post -treatment device. Its technical scheme includes winding roller, processing box body and baffle, the processing box body lower surface welding has workstation, processing box body one side outer end surface is established with feeding hole, and processing box body both sides outer end surface all are established with air inlet, the fan that processing box body inside bottom end is installed, and the upper surface intercommunication of fan has the blow -off cover, the processing box body inner wall welding has the filter plate, the inside top of processing box body and the upper surface of filter plate all are fixed with outer rod, and the outer rod one side outer end surface swing plug -in has the inner rod, the inner rod one side outer end surface is fixed with the clamping plate, and the recess is established in the clamping plate inside, the inner wall rotation of processing box body is connected with winding roller, the winding roller one side outer end surface is fixed with baffle, and the winding roller upper surface establishes the fixed slot. The utility model is convenient for one side cooling one side winding, and the processing efficiency is high.

This invention provides a window sealing structure assembly and a vehicle, belonging to the technical field of vehicle components. It includes a window frame, and sequentially integrated components forming a ring: a welt groove, a rear lower joint, a water-cutter, and a front lower joint. The water-cutter is located below the welt groove. A mounting groove is formed on the window frame at the open edge of the window frame, corresponding to and engaging with the welt groove. The opening of the mounting groove faces the open window frame and is located inside the outer panel of the window frame. The welt groove fits tightly against the outer surface of the window frame. The water-cutter connects to the lower edge of the open window frame. This invention reduces the channels for internal and external airflow at the sealing structure around the open area of ​​the window frame, which is beneficial for improving the vehicle's NVH performance; it reduces the number of parts during assembly, effectively reducing assembly steps and lowering assembly difficulty; and it ensures a smooth and aesthetically pleasing appearance.

The utility model relates to the technical field of iris valves, and discloses a high-sealing iris valve which comprises a mounting seat, a supporting plate is fixedly mounted on the side face of the mounting seat, and a valve body is fixedly mounted at the end of the supporting plate. Due to the design of the valve plates, the main sealing strip, the secondary sealing strip, the main sealing groove and the secondary sealing groove, opening and closing operation is achieved through mutual matched rotation of the six valve plates, and meanwhile the main sealing strip and the secondary sealing strip between every two adjacent valve plates are in an embedded state with the main sealing groove and the secondary sealing groove all the time. The main sealing strip and the secondary sealing strip are matched with the main sealing groove and the secondary sealing groove, the main sealing strip and the secondary sealing strip move along with the valve plates in the moving process and are embedded along with the valve plates in the closing process, and therefore two layers of crossed areas are formed between the contact faces of every two adjacent valve plates, and poor sealing performance caused by excessive abrasion of the smooth faces is prevented. According to the technical scheme, the sealing performance of the contact faces between the valve plates is improved, and the technical problem that the sealing performance is poor is solved.

This utility model provides a fermentation tank for bio-organic fertilizer production, belonging to the technical field of organic fertilizer fermentation tanks, to solve the problems of inconvenient real-time observation of the fermentation process and cumbersome sampling procedures in existing bio-organic fertilizer production fermentation tanks. It includes a fermentation tank body; a feed inlet located on the upper part of the fermentation tank body; an observation window fixedly installed on the front side of the fermentation tank body; a sampling box fixedly installed on the upper part of the fermentation tank body; two sets of sampling clips located inside the sampling box; a sampling port located on the upper part of the fermentation tank body; an observation component located on the front side of the fermentation tank; and a sampling component located inside the sampling box. This utility model has advantages such as real-time observation, reduced pollution, and convenient sampling.

This utility model discloses a yellow phosphorus tail gas combustion system that reduces the generation of acidic substances, belonging to the field of phosphorus chemical processing technology. It solves the problems of high cost, inefficiency, poor stability, and easy secondary pollution associated with existing technologies. The system includes three sequentially connected modules: tail gas pretreatment, combustion, and purification, forming a complete treatment pathway. The pretreatment module uses a centrifugal fan to transport the tail gas, a spray-filter desulfurization tower to remove sulfides, and a high-pressure backflush pipe to ensure stable airflow. The combustion module optimizes the air-fuel ratio, combines flue gas circulation and parameter monitoring to suppress nitrogen oxide generation, and is adapted to boiler waste heat utilization. The purification module is equipped with a waste heat recovery device before electrostatic precipitator to remove impurities. The system achieves desulfurization liquid regeneration and circulation, reduces equipment corrosion and treatment costs, ensures that exhaust gas emissions meet standards, and balances environmental protection and energy utilization efficiency.

This invention discloses a highly efficient composite solubilizer for the hydration of butene to sec-butanol, belonging to the field of chemical process technology. Its composition includes: 0-60 parts of a polyether-based polymeric surfactant, 15-35 parts of a highly polar aprotic solvent, and 10-20 parts of a co-catalyst. The main solubilizing component of this invention disperses oily butene into extremely small droplets, allowing it to mix uniformly in water, thereby increasing the surface area for the reaction. The co-solvent, as the main component, provides a stable environment, ensuring that this highly mixed state is maintained for a certain period. The added additives, possessing both water and oil solubility, facilitate smoother dissolution of the mixture and help the reactants quickly contact the active sites of the catalyst. This accelerates the reaction rate of butene and water, significantly improving the efficiency of the one-time conversion to sec-butanol and greatly saving the large amount of energy required for material recycling.

This application discloses an integrated coupling device for denitrification and carbon monoxide removal, belonging to the technical field of flue gas purification equipment. By incorporating an integrated flue gas flow pipe within the device, the carbon monoxide removal catalyst and the denitrification catalyst are respectively isolated and placed in two channels within the flow pipe. This ensures smooth flue gas flow with low resistance, effectively preventing carbon monoxide catalyst deactivation due to poisoning, thus guaranteeing carbon monoxide removal efficiency and extending service life. Furthermore, the integrated flue gas flow pipe is mounted on the support beam simultaneously with the catalyst installation, achieving a compact configuration of the equipment space and effectively solving the problem of tight site layout. Simultaneously, the integrated flue gas flow pipe structure significantly reduces structural and civil engineering costs, enabling more convenient system operation, maintenance, and repair.

The invention discloses a CHDM production and separation method and system using cyclohexane as a solvent, and the method comprises the following steps: carrying out phase separation on a DMT hydrogenation product using cyclohexane as a solvent to obtain a cyclohexane phase and a CHDM phase; the CHDM phase and circulating water are fed into a cyclohexane removal tower, a tower top gas phase is condensed and split to obtain a water phase and a cyclohexane phase, crude CHDM obtained in a tower kettle is fed into a light component removal tower, then a tower kettle product is fed into a heavy component removal tower, and a CHDM product is obtained at the tower top; a cyclohexane phase, a mixed product from a reaction section and circulating water are fed into an extraction tower for separation, a cyclohexane product is obtained at the top of the tower, a water-phase mixture obtained at the bottom of the tower is fed into a methanol refining tower, a methanol product is obtained at the top of the tower, and water obtained at the bottom of the tower is used as circulating water. According to the method, the DMT hydrogenation mixed product taking cyclohexane as the solvent is separated, the CHDM product, the cyclohexane product and the methanol product are obtained respectively, the yield of the CHDM product is higher, the system process flow is simple, and the technical economy is high.

The invention discloses a mirror image high-gain Boost converter with switch tubes synchronously switched on and switched off, and belongs to the technical field of power electronic direct current conversion. The converter comprises a direct-current voltage source, two inductors, seven capacitors, seven diodes and two MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switching tubes. The core innovation lies in that the two switching tubes are completely and synchronously switched on and switched off, no dead time needs to be set, and the control logic is simplified. Through specific connection and multiplexing of a capacitor and an inductor, an efficient voltage-multiplying unit is formed, extremely high voltage gain is achieved, the gain formula is shown in the specification, and D is the duty ratio of a switching tube. According to the structure, high gain is obtained, meanwhile, the voltage stress of the switching tube is remarkably reduced, the value of the voltage stress is only output voltage, and the switching loss is effectively reduced. The device has the advantages of being small in number of devices, compact in structure, high in efficiency, low in cost and the like, and is particularly suitable for occasions where low input voltage needs to be boosted to high direct current bus voltage in the new energy field of photovoltaic systems, energy storage systems and the like.

The utility model relates to a tank cleaning wastewater grating rough filtration device, which comprises a tank body and a screen drum rotatably arranged in the tank body, one end of the tank body is provided with a water inlet, one end of the screen drum far away from the water inlet penetrates through the other end of the tank body and extends to the outside, the bottom of the tank body is provided with a water outlet, and the top of the tank body is provided with a washing assembly. A washing assembly is arranged on the tank body, a conveying assembly is arranged on the tank body, a driving assembly connected with the washing assembly is further arranged on the tank body, and the driving assembly is respectively connected with the screen mesh cylinder and the conveying assembly through a transmission structure. By means of mutual cooperation of the washing assembly, the driving assembly, the conveying assembly and the transmission structure, impurities attached to the screen mesh cylinder can be washed away, the screen mesh cylinder is prevented from being blocked, and the impurities washed down from the screen mesh cylinder can be conveyed to the outside of the tank body in time.

The application discloses a linkage type injection molding insert ejection mechanism, which comprises a rack, a supporting seat for supporting injection molded parts is arranged at the top of the rack, and at least two pressing assemblies for pressing the injection molded parts are arranged on both sides of the supporting seat; at least one limiting seat is detachably arranged on the supporting seat, each limiting seat corresponds to two inserts, and a rectangular hole for the inserts to pass through is formed in the limiting seat; two first and second follow-up ejection assemblies for respectively ejecting corresponding inserts are arranged below the supporting seat, a first ejection assembly matched with the first follow-up ejection assembly is arranged at one end of the supporting seat, and a second ejection assembly matched with the second follow-up ejection assembly is arranged below the supporting seat. The application also discloses an injection molded product marking device. The ejection assembly and the follow-up ejection assembly are synchronously matched, a pushing and pulling resultant force is formed, the inserts are uniformly stressed, and the inserts are smoothly pulled out.

This utility model discloses a three-dimensional touch structure, aiming to provide a three-dimensional touch structure that improves operational performance, enables multi-directional operation, and thus enhances operational efficiency and interactive experience. It includes a support frame with a connecting diaphragm inserted into it. One end of the connecting diaphragm is connected to a surface touch diaphragm, and the other end is connected to a side touch diaphragm. A decorative main panel has a surface groove on one end face of the support frame, connecting the decorative main panel to the surface groove and the surface touch diaphragm to the decorative main panel. A decorative side panel has a side groove on the side face of the support frame, connecting the decorative side panel to the side groove and the side touch diaphragm to the decorative side panel. A PCB board has a mounting groove on the other end face of the support frame, and the PCB board is bolted to the support frame within the mounting groove. A backplate assembly is snapped into the support frame. The beneficial effects of this utility model are: the touch structure enables multi-directional three-dimensional touch interaction, improving operational performance; and enhancing interactive efficiency and user experience.

The invention belongs to the field of diethylene glycol production, and relates to a method and a system for increasing the yield of diethylene glycol (DEG) and triethylene glycol (TEG) by using an EOEG device. The method for increasing the yield of diethylene glycol and triethylene glycol comprises the steps that monoethylene glycol, ethylene oxide and optional diethylene glycol are subjected to an N-stage reaction in the presence of a catalyst, N is an integer not smaller than 2, a reaction solution obtained in the previous stage is subjected to interstage heat removal, ethylene oxide is supplemented, and then the reaction solution enters the next stage for reaction, a reaction solution containing monoethylene glycol, diethylene glycol, triethylene glycol and heavy alcohol is obtained after the N-stage reaction, and then monoethylene glycol, diethylene glycol, triethylene glycol and heavy alcohol are obtained through separation. According to the invention, a multi-stage reactor (preferably a multi-stage tubular reactor) is adopted, and a method of inter-stage heat removal and segmented ethylene oxide supplementation is combined, so that under the condition of ensuring safety, the supplementation amount of ethylene oxide can reach 45% (based on the total amount of raw materials except ethylene oxide being 100%), the yield of diethylene glycol and triethylene glycol is increased to the maximum extent, and the yield of ethylene glycol and triethylene glycol is increased to the maximum extent. The conversion per pass of monoethylene glycol is high, and the subsequent separation energy consumption is low. Meanwhile, a product scheme can be adjusted, and subsequently rectified diethylene glycol is returned to a reaction system, so that the yield of triethylene glycol is further increased.

The invention discloses a heat pump air conditioning system which comprises a compressor and a heat pump, the four-way reversing valve is connected with the compressor and is configured to change the flow direction of a refrigerant; the indoor heat exchanger is connected with the four-way reversing valve; the outdoor heat exchanger is connected with the four-way reversing valve; the refrigerant storer is configured to store a refrigerant flowing through the refrigerant storer; the first pipeline is configured to connect the outdoor heat exchanger and the indoor heat exchanger; the branch pipeline is configured to be connected with the refrigerant storage and the first pipeline to form a refrigerant flow path; the adjustable on-off device is arranged on the first pipeline, and the adjustable on-off device is configured to adjust the flow of the refrigerant flowing through the refrigerant storage so as to adjust the refrigerant circulation amount in the air conditioning system. According to the air conditioning system, dynamic adjustment of the refrigerant circulation amount can be achieved, so that the requirements of the air conditioning system for the refrigerant amount under different working conditions are met.

The application discloses a kind of H-MMC motor drive system comprehensive control method of same frequency operation.The H-MMC motor drive system includes: H-MMC, permanent magnet synchronous motor and AC power grid;System comprehensive control method of same frequency operation is mainly composed of compensation phase angle calculation, motor side speed control, grid side power control, bridge arm submodule voltage stabilization and voltage equalization control and modulation wave calculation 5 parts;The application gives the topological structure of H-MMC motor drive system, adjusts motor phase angle by real-time calculation compensation phase angle, to control H-MMC bridge arm difference frequency power tends to zero;Greatly reduce the requirement of circulation and neutral point voltage, without increasing controller, to realize the stable operation of system under same frequency working condition, with the advantages of small submodule capacitor voltage ripple, small loss, relatively simple control when same frequency operation.

The invention discloses a dynamic parallel control method, device and system for a multi-branch battery system. The dynamic parallel control method for the multi-branch battery system comprises the following steps: acquiring terminal voltage and current of each battery branch to be connected in parallel; on the basis of the equivalent circuit model of each battery branch, slowly-varying voltage of each battery branch is calculated according to the terminal voltage and the current, and the slowly-varying voltage is the sum of the terminal voltage and ohm internal resistance partial voltage; and according to a preset working condition, controlling the battery branches to be connected into the main loop in sequence based on the slowly-changing voltage. According to the invention, parallel control can be carried out on the multi-branch batteries more accurately in a manner of adapting to dynamic working conditions, ring current among the branches is reduced, the service life of the battery system is prolonged, and the shutdown time of the battery system is reduced.

The utility model provides a flue gas circulation oxygen-rich incineration system for nitrogenous organic waste gas and / or waste liquid, which comprises an incinerator, a combustion-supporting gas burner, a waste liquid burner and / or waste gas burner are arranged on the incinerator, the combustion-supporting gas burner is connected with a gas delivery pipe through a pipeline, and the flue gas circulation oxygen-rich incineration system further comprises a waste heat boiler connected with the incinerator through a pipeline. The waste heat boiler is connected with a flue gas conveying pipeline and a low-pressure steam or high-temperature hot water recycling conveying pipeline; a gas inlet of the flue gas drying tower is communicated with a flue gas conveying pipeline, a gas outlet of the flue gas drying tower is connected with a first output pipe, the first output pipe is connected with a first three-way valve, and the first three-way valve is respectively connected with a first conveying pipe and a second conveying pipe; the oxygen supply unit is connected with a mixer through a pipeline, the mixer is connected with a first conveying pipe, and an outlet of the mixer is connected with the combustion-supporting gas burner, the waste liquid burner and / or the waste gas burner through pipelines. According to the utility model, the heat utilization rate is improved, and the flue gas denitration cost is reduced.

The invention discloses a suberect spatholobus stem decoction piece quality evaluation method based on a'excellent shape and high quality 'theory, and belongs to the technical field of traditional Chinese medicine quality evaluation. According to the method, key character indexes (the number of turns, the diameter and the delta E) are screened out by utilizing principal component analysis, correlation analysis and partial least squares discriminant analysis (OPLS-DA) by measuring the external character indexes (powder color delta E * > = 35, the diameter and the maximum number of turns of a tangent plane) and the internal quality indexes (catechin, epicatechin and the content of alcohol-soluble extracts) of the caulis spatholobi decoction pieces; and a quantitative correlation and prediction model of the content of the components and the content of the internal components is established. By setting a key character threshold (delta E * > = 35, the number of turns > = 5, and the diameter > = 5.0 cm) or using a prediction model, rapid and objective evaluation of the quality of the caulis spatholobi decoction pieces can be realized, traditional subjective identification and complex instrument detection are effectively replaced, and a reliable standard is provided for quality control and market circulation of medicinal materials.

The invention discloses a light hydrocarbon aromatization method, which is characterized in that an aromatization reaction is carried out in a reaction system taking one or more of C4-C7 alkanes as raw materials under aromatization reaction conditions and in the presence of a ZnO / HZSM-5 molecular sieve catalyst, CO is introduced into the reaction system, the molar ratio of CO to C4-C7 alkanes is at most 0.9, the molar ratio of CO to C4-C7 alkanes is at most 0.9, the molar ratio of CO to C4-C7 alkanes is at most 0.9, the molar ratio of CO to C4-C7 alkanes is at most 0.9, and the molar ratio of CO to C4-C7 alkanes is at most 0.9. In the ZnO / HZSM-5 molecular sieve catalyst, based on the mass of the HZSM-5 molecular sieve, the loading amount of ZnO is 1-4% by mass. According to the method, the generation of methane and ethane with low value in aromatization reaction can be effectively inhibited by using a small amount of CO, and the selectivity of propane and butane is improved, so that the yield of valuable products is improved.

This invention provides a method for preparing carbon-coated lithium iron phosphate, comprising: S1: providing a lithium source solution, a ferrous source solution, and a phosphorus source solution; S2: mixing the lithium source solution, the ferrous source solution, and the phosphorus source solution to obtain a first solution, adjusting the pH of the first solution to alkaline, to obtain a second solution; S3: performing vacuum distillation on the second solution, during which an organic carbon source solution is added to the second solution until the volume of the reaction solution no longer decreases, to obtain a third solution; S4: heating the third solution to a preset temperature, maintaining the preset temperature, and introducing a coolant into the third solution to obtain a fourth solution; S5: drying the fourth solution to obtain the carbon-coated lithium iron phosphate. This method can reduce energy loss during the preparation process, reduce raw material costs, and improve the cycle life of lithium iron phosphate battery modules.

The present application relates to the technical fields of industrial automation and energy storage module automation, in particular to a multifunctional gripper mechanism for automatic handling, distance adjustment and tray storage of battery cells, comprising a six-axis robot arm, one end of the six-axis robot arm is provided with a mechanical hand gripper, the mechanical hand gripper is composed of a distance adjustment mechanism and a tray storage mechanism, the distance adjustment mechanism and the tray storage mechanism are integrated in the same mechanical hand gripper through a dual-purpose gripper fixing plate, so that a single gripper simultaneously has three functions of battery cell grabbing, distance adjustment and empty tray recycling. Compared with the operation mode in the prior art, which is characterized by scattered functions and the need for multi-station cooperation, the present application reduces the equipment floor area and the battery cell circulation links, and effectively improves the production line space utilization and the production rhythm.

According to the circulating current suppression and current sharing control method of the UPS parallel system, a self-adaptive state observer and a self-adaptive virtual impedance compensator are embedded in a digital controller of an inverter, and the inverter is controlled according to the following steps that a, output phase current and output voltage signals of the inverter are collected; b, the adaptive state observer identifies a real-time impedance estimation value of an inverter output loop on line; c, assigning the real-time impedance estimation value to the virtual impedance, and calculating the theoretical voltage drop generated by the output current on the virtual impedance; d, generating a voltage reference instruction; e, the voltage reference instruction is sent to a voltage and current double closed-loop PID controller at the rear stage of the inverter, and closed-loop control of the parallel system is completed. According to the invention, accurate perception of line impedance is realized through the adaptive state observer, and a compensated voltage reference instruction is generated through the adaptive virtual impedance compensator, so that the operation efficiency and reliability of the UPS parallel system are greatly improved, and the service life of the UPS parallel system is greatly prolonged.