72results about How to "Eliminate circulation" patented technology

A method and a device for non-invasive blood pressure measurement wherein the angle between the hand and the wrist, and the turning angle of the wrist relative to the middle part of the forearm, are kept to the most suitable degree for measuring the blood pressure of the radial artery. At least one pressure bladder and one arterial pulse transducer array are placed on the skin over the radial artery of the wrist to apply the external pressure to the artery and to detect the change of the arterial pulse signals. This method and device can correctly measure the intermittent or continuous blood pressure of the radial artery or the ulnar artery based on the principles of oscillation method and volume compensation method, and effectively eliminate the influence on the measurement due to body movement and the influence on blood circulation and neural function of the hand caused by long-term blood pressure measurement.

The invention relates to a unified power energy quality controller based on the serial-connection multiplicity of transformers and a chain structure, which belongs to the technical filed of flexible AC transmission and distribution of an electric power system and the power electronic. The unified power quality controller comprises a single-phase serial-connection multiple transformer bank and a single-phase chain H bridge converter, wherein the transformer bank consists of m single-phase transformers which form the serial-connection multiple transformer bank together with n voltage source converters connected with n secondary windings of m single-phase transformers respectively; the single-phase chain H bridge converter is provided with n chains and is formed by connecting n DC voltage supporting units and n power source converters, and an AC port of the n-chain single-phase chain H bridge converter is directly connected with the electric fence through a reactor, m and n are signless integrals equal to or more than 2, and m is less than or equal to n. The invention can realize accurate current control, has high dynamic responding speed, and can solve the problems of the traction substation of an electrified railway that the three-phase voltage is unstable and fluctuates, the power factor is low and the harmonic pollution exists, and the like.

The present invention relates to a chimeric inhibitor protein of a protease comprising an inhibiting polypeptidic sequence and at least one polypeptidic sequence of a substrate-enzyme interaction site specific for a protease. Other objects of the invention are to provide a purified and isolated DNA sequence encoding the chimeric inhibitor protein of a protease, an expression vector characterized in that it comprises said purified and isolated DNA sequence, a eukaryotic or prokaryotic host cell transformed with this expression vector and a method of producing a chimeric inhibitor protein.

The invention discloses a co-rectifier transformer medium voltage type regenerative braking energy feedback device and a control method thereof; the feedback device comprises a rectifier transformer,an energy feedback unit, and a rectifier unit; a grid connected switch and an isolation transformer are respectively connected in series between the energy feedback unit and a rectifier transformer valve side winding; the energy feedback unit comprises two inverters; DC sides of the two inverters are provided with a single-knife-double-end isolation switch block; the DC sides of the two invertersare connected with a DC traction network through the single-knife-double-end isolation switch block; the feedback device control method comprises the following steps: starting, running and stopping the energy feedback unit according to a first startup threshold value, a second startup threshold value, an overvoltage protection value, a stop threshold value and a current gradient determination value. The feedback device can eliminate the circulation between the energy feedback unit and the rectifier unit, has a larger feedback capacity than a low voltage feedback device, has a simplified structure when compared with a conventional medium voltage feedback device, and uses less general assembly dimensions and land occupation areas, thus reducing cost, and providing good versatility.

A modular robotic kitchen system is conveniently adaptable to perform a wide range of cooking applications. The modular robotic kitchen system can include a plurality of discrete modular units organized in a small footprint such that multiple types of cooking applications can be performed without a need to replace the modular units. Exemplary modular units include an ingredient module, robotic arm module, assembly and packaging module, and warming module. Optionally a transport unit or sled moves the modules into position. The modular kitchen system includes a central processor operable to carry out different cooking applications upon downloading software corresponding to the specific cooking application and without retooling the existing modules. Related methods are also described.

A power equalization device for parallel inverter based on current sag characteristics and a control method are disclosed. The power equalization device comprises a DC voltage stabilized power supply,an inverter control unit and a central controller. Each inverter control unit includes a three-phase inverter and an improved current sag control module. The output current of the three-phase inverter is synthesized by the improved current sag control module, and then the SPWM wave is output through the voltage-current dual-loop controller and the SPWM pulse modulation module to control the inverter. Central control acquires instantaneous value of output current at common couple point for [alpha] [beta] transformation, calculates the instantaneous reactive current, according to the ratio of the reactive current value of each three-phase inverter in the parallel inverter to obtain the average value of the reactive current as the reference value of the inverter, The reference value is transmitted to each reactive current sample value and subtracted to make difference and multiplied by the integral constant feedback, and the reactive output bias is adjusted by the following action of theintegral regulator, so that the reactive current is proportionally divided according to the capacity, and the circulating current is eliminated.

The invention discloses an energy feedback unit and an energy feedback method. The energy feedback unit comprises a three-phase input wire voltage sampling module, a current sampling module, a busbar voltage sampling module and a control module, wherein the three-phase input wire voltage sampling module is used for sampling the voltage of a power grid and transmitting the voltage to the control module, the current sampling module is used for sampling the current of the power grid and transmitting the current to the control module, the busbar voltage sampling module is used for sampling the busbar side voltage of the energy feedback unit and transmitting the busbar side voltage to the control module, and the control module is used for performing an automatic phase distinguishing and locking algorithm according to a signal transmitted by the three-phase input wire voltage sampling module and performing a double-closed-loop control algorithm and a zero sequence current compensation control algorithm according to signals transmitted by the current sampling module and the busbar voltage sampling module so as to generate a PWM driving signal for driving a first inverter bridge. The energy feedback unit and the energy feedback method have the advantages that the zero sequence current compensation algorithm is adopted for eliminating loop current, the power supply reliability is improved, the phase position of power grids can be automatically identified, and indifference grid connection is achieved.

This invention relates to a weak magnet driving device for a permanent magnetic brushless DC motor, which connects a same MOSFET in series and reversely under the MOSFET of each upper bridge arm and lower bridge arm on the basis that a traditional magnet brushless DC motor three phase bridge drive device connects six MOSFET with a three-phase bridge reverse drive circuit to connect the S pole of the corresponding two to effectively eliminate circulation flow and increase the speed ratio of the brushless DC motor.

The invention discloses a decommissioned battery cascade utilization method, which is characterized by comprising the following steps of: S1, sorting decommissioned batteries; S2, recombining the single decommissioned batteries again; and S3, constructing a flexible grouped energy storage system based on parallel connection of a multi-cluster battery system. The invention further discloses application of the decommissioned battery cascade utilization method in recycling of decommissioned batteries of new energy vehicles. According to the decommissioned battery cascade utilization method disclosed by the invention, the decommissioned batteries can be rapidly, safely and efficiently utilized in an cascade manner, the reuse cost is low, the battery capacity can be adjusted according to the current cascade cluster, the energy is automatically adjusted and output to a PCS and a charger, the parallel high-power output of various cascade battery clusters can be compatible in a diversified manner, the problem of circulation generated between different cascade battery clusters in differential parallel connection is eliminated, the inconsistency of cascade batteries is well avoided, the optimal stable operation of the whole system is realized, and the safety risk in use is reduced.

The invention discloses a circulation-free optimization control method of a reconfigurable battery pack. The method comprises the steps of acquiring voltage and current data of all battery modules inthe reconfigurable battery pack at the current moment; calculating the SOC value of the current battery module according to the voltage value and the current value; calculating the number of battery modules required by each series battery branch according to the minimum voltage required by the load and the discharge cut-off voltage of the battery modules; solving an optimal state set of all battery modules in the reconfigurable battery pack by adopting a crisscross optimization algorithm according to a circulation optimization objective function provided by the invention; and calculating the corresponding state of a reconfiguration switch according to the state of the battery of the reconfiguration battery pack, and controlling the connection of the reconfiguration battery pack by taking the corresponding state of the reconfiguration switch as a control signal. According to the invention, circulation between the battery modules is eliminated, the electric energy efficiency is improved,and the service life of the battery is prolonged.

The invention discloses a large-scale lamp bulb tubular pump device. The large-scale lamp bulb tubular pump device comprises a water inlet, a water inlet runner, a rotating wheel chamber, a guide blade body section, a lamp bulb body section, a water outlet runner and a water outlet which are sequentially arranged in the water flow direction. A rotating wheel comprises a water guide taper, a hub and a rotating wheel main shaft, the outer surface of the hub is a spherical surface, rotating wheel blades are evenly arranged in the circumferential direction of the hub and are dissymmetrical twistedblades, the guide blade body section is internally provided with four to six dissymmetrical guide blades, single guide blade outlets right face manholes, and therefore influences of the manholes on the guide blade outlet flowing state are reduced. A lamp bulb body penetrates through the guide blade body section and the lamp bulb body section, the tail of the lamp bulb body is oval, and thereforethe tail backflow zone is reduced. Through numerical simulation and experimental verification, the pump device efficiency can reach 80% or above, the pump impeller efficiency can reach 91% or above, and the large-scale lamp bulb tubular pump device can be used for running of medium and low lift large-flow pump stations and can also be used for transformation and renovation of existing lamp bulb tubular pump stations.

The invention discloses cement production line fine powder grinding equipment which comprises an inclined spiral feed device, a drying device, a hot air device, a pulverizer, a powder screening machine and a fine powder collector which are sequentially connected, wherein the pulverizer comprises a discharge pipe, a primary fan, a grader, a swing roller, an abrasive disk, a speed reducer and a motor which are sequentially connected from top to bottom; the inclined spiral feed device comprises a horizontal feed inlet, an obliquely upward spiral transmission section, a horizontal transmission section and an inclined feed section which are sequentially connected; the obliquely upward spiral transmission section is connected with the drying device, and the horizontal transmission section is connected with the hot air device; furthermore, the temperature of hot air blown out of the hot air device is kept below 45 DEG C; in addition, the pulverizer is connected to the top position of the powder screening machine through the discharge pipe; a smashing device is further arranged at the bottom of the powder screening machine, and the powder screening machine is connected with the fine powder collector through a collection pipe which is arranged at the top of the powder screening machine. The cement production line fine powder grinding equipment has the advantages of high production efficiency, higher cement evenness and higher fineness quality.

The invention discloses a method for improving reactive power distribution of parallel inverters. The method comprises steps of firstly, calculating output voltage Ud1, Uq1, Ud2 and Uq2 and output current Id1, Iq1, Id2, and Iq2 of two inverters under a dq coordinate system, and calculating angular frequencies of omega 1 and omega 2 through active power P1 and P2; using reactive power-voltage droopof compensation voltage to control output end voltage reference values of U1* and U2* of the inverters; calculating reference values Ed1 and Eq1, and Ed2 and Eq2 of the output voltage of the inverters under the dq coordinate system; and finally, allowing a PI controller to serve a a controller of voltage and current double closed loop to control the voltage Ud1, Uq1, Ud2 and Uq2 and the current Id1, Iq1, Id2, and Iq2 of the inverters under the dq axis coordination system so as to obtain modulation signals of the PWM of the inverters, thereby achieving passive power precise distribution between the inverters. According to the invention, problems of distribution deviation of reactive power and parallel connection circulation caused by impedance ratio matching of circuits of parallel inverters in the prior art are solved.

The invention provides a multi-VSG inverter circulation suppression and fault processing control method and system, and the method comprises the steps: carrying out the compensation of each VSG inverter through employing a pre-synchronization control compensation method for each VSG inverter which completes the setting of a power parameter when the grid-connected switching is carried out through an off-grid mode until the grid-connected requirements are met; during steady-state operation after grid connection, if an asymmetric fault of a load occurs, connecting the current type inverter and the VSG inverter in parallel after power parameter setting and connecting the current type inverter and the VSG inverter into a power grid, and compensating for the unbalanced current, wherein the powerparameter of each VSG inverter is set based on the rated capacity of each VSG inverter. The multi-VSG inverter control method provided by the invention not only effectively ensures that the multi-VSGinverter can realize power distribution through parameter setting, but also can ensure synchronization with a power grid in a pre-synchronization process, can effectively suppress grid-connected impact current, improves electric energy quality, and realizes seamless switching between operation modes. And the problem of circulating current among the multiple VSG inverters is eliminated.

The invention provides a multi-working-condition multi-stage turbine. The multi-working-condition multi-stage turbine comprises a draft tube, a sectional type guide vane, an axial-flow impeller, a shell, a main shaft, centrifugal impellers, impeller rings, movable guide vanes, a balance disc, a mechanical seal, a bearing pedestal and a deep groove ball bearing. The multi-working-condition multi-stage turbine aims to improve the efficiency and the stability of the turbine under the variable working conditions. The multi-stage centrifugal impellers are suitable for recycling the energy with high energy head fluid. The movable guide vanes can play a role in flow adjustment, and can also be used for adjusting the inflow angle and reducing the inflow impact loss when the condition deviates from the designed working condition. Similarly, the sectional type guide vane is designed for adapting to different working conditions, and can effectively eliminate the circulation of water flow in the draft tube, and therefore the cavitation damage to the draft tube is greatly reduced, and the vibration of the draft tube is weakened.

The invention discloses a large-scale distributed flexible wind and light storage, charging and discharging commercial power AC/DC hybrid system and control system based on energy cloud interconnection. The system comprises a multi-megawatt battery energy storage converter and a wind and light storage integrated system which are complementary, a transformer-free high-voltage direct-hanging battery energy storage power conversion system, an AC micro-grid and a DC micro-grid. High voltage and high power are achieved, the voltage and the power are automatically adjustable, the intelligent power grid and the optical storage are bidirectionally complementary in charging and discharging, and uninterrupted power supply is achieved.

Disclosed are a traditional Chinese medicine composition for treating tumours and a preparation method therefor, wherein the composition is prepared from Sophora flavescens, wild chrysanthemum flower, honeysuckle, mint, Poria cocos, Atractylodes lancea, cinnamon, clove, Astragalus, Ganoderma lucidum, Ligusticum striatum, Aucklandia root and Radix glycyrrhizae. The traditional Chinese medicine composition has an anti-tumour effect.

A direct oxide fuel cell includes a membrane electrode assembly (MEA), an anode collector, a cathode collector, an anode flow channel plate, and an equalization structure. The anode collector and the cathode collector are disposed on two sides of the MEA respectively. The anode collector contains a plurality of through zones surrounded and a non-through zone. The anode flow channel plate is disposed on a side of the anode collector facing away from the MEA, and includes a fuel transmission channel. The equalization structure disposed in the fuel transmission channel has an end connected to the anode flow channel plate and an opposite end abutting against the anode collector. An area of non-through zones abutted by the equalization structure is bigger than an area of the through zones abutted by the equalization structure.

The invention discloses an unbalance load of a virtual synchronous generator belt and a control method of parallel connection of the virtual synchronous generator belts. The control method comprises steps of firstly, calculating VSG output voltage Ualpha, Ubeta, and output current Ialpha, Ibeta, under a two-phase static coordinate system, and calculating the angular frequency omega and a VSG output end voltage reference value Uref through active power P; calculating reference values Ealpha and Ebeta of the VSG output voltage under the two-phase static coordinate system; using a positive sequence compound proportion integral controller as a voltage and current loop-locked controller to control the voltage Ualpha, the voltage Ubeta, the current Ialpha, and the current Ibeta under the two-phase static coordinate system so as to obtain a PWM modulation signal; obtaining angular frequencies omega 1, omega 2 of two VSGs; and by use of the integral controller, allowing the omega 2 to follow the omega 1, using the output as compensation quantity and adding the compensation quantity into a rotor motion equation, thereby achieving parallel connection of two VSGs. According to the invention,problems of unbalance of output voltage caused by unbalance load and circulation in the unbalance load of multiple VSG belts in the prior art are solved.

An antitumor nano-drug, a preparation method and use thereof, wherein the nano-drug mainly takes lipoic acid polymer as an active component. The nano-drug can reduce toxic and side effects, and can be used in combination with other anti-tumor active substances.