68results about How to "Smooth crossing" patented technology

The invention discloses a low-voltage traversing control method for a double-fed wind power generation system. The method comprises the following steps of: 1) detecting zero frequency transient flux component of a motor; 2) when the motor has zero frequency transient flux component outburst, controlling a rotor current transformer and a network current transformer, and attenuating the zero frequency transient flux components of the current transformers; and 3) controlling torque current and power grid reactive compensation current to inhibit the growth of harmful voltage and prevent the formation of harmful current. The method can really realize the elimination of the transient flux caused by sudden decline and sudden rise of a stator voltage and inhibit negative sequence current so as to avoid offline of the fan power generation system at the same time of protecting the rotor current transformer and the network current transformer; meanwhile, by the method, double times ultrahigh dangerous voltage of rotor induction caused by zero frequency transient flux superposition when the voltage is recovered can be prevented, and power grid-friendly intelligent low-voltage traversing is realized.

The invention discloses an automatic pipe fitting path distribution conveying mechanism, and belongs to the field of workpiece machining conveying mechanical equipment. A guide pipe mechanism and a path distribution mechanism of the automatic pipe fitting path distribution conveying mechanism are sequentially arranged on one side of a fixed bracket from top to bottom; a distribution pipe materialpipe is obliquely arranged in the position, on the lower side of a guide pipe material pipe, of the fixed bracket; the lower side of the guide pipe material pipe is provided with a bearing pipe baffle; the upper end of a material supplying pipe communicates with the lower end of the guide pipe material pipe; a front path distribution material pipe is vertically arranged in the middle of the lowerside of the material supplying pipe, and a rear path distribution material pipe is vertically arranged at the tail end of the lower side of the material supplying pipe; a material separation mechanismis horizontally arranged on the upper side of the material supplying pipe; and the upper end of the front path distribution material pipe is provided with a rotary baffle, and one side of the lower end of a hook rotary plate located on one side of a reciprocating rotary plate is provided with a hook mechanism. The automatic pipe fitting path distribution conveying mechanism is reasonable in structural design, can stably and efficiently distribute pipe fittings into paths for conveying and can discharge the pipe fittings according to the rear path pipe fitting machining load requirement, the automation degree of pipe fitting path distribution conveying is increased, and the production using requirements are met.

The invention discloses a wind power plant active power scheduling method for guaranteeing flexible tower resonance ride-through. The method comprises the following steps: obtaining an active power regulation and control target value from a power scheduling system; if the active power regulation and control target value is greater than the sum of the full-field real-time active power, dividing controllable fans into seven up-regulation priorities according to the real-time power and the propeller angle, and sequentially increasing the power of the fans until a full-field active power limit value reaches the active power regulation and control target value; if the active power regulation and control target value is less than a full-field real-time active power sum, dividing the active powerregulation and control target value into eight down-regulation priorities, sequentially decreasing the power of the fans until the full-field active power limit value reaches the active power regulation and control target value, and returning an active power set value of each fan to the power scheduling system. In the power scheduling process, it can be guaranteed that the fans smoothly pass through a resonance rotating speed interval, so the fans are prevented from staying in the resonance rotating speed interval; the frequencies of the fans passing through the resonance rotating speed interval are reduced, the loads of the fans are effectively reduced, and the safety of the fans are improved.

The invention relates to an open type TBM (Tunnel Boring Machine) fullface synchronous lining trolley for a hydraulictunnel, which is characterized in that: a fullface pattern plate assembly slides on a girder front and back, so that lining construction is carried out alternately; the front and the back of the girder are respectively provided with a bearing for stabilizing the trolley; a space for a train to pass through is reserved in the girder; an upper rack is provided with a space for a large-diameter vent hose to pass through and protective measures thereof; the side face of a lower rack is provided with a continuous belt conveyor bearing platform; the front and the back of the girder are respectively provided with a transfer track system; and track skeletons can be removed and paved quickly through a crane system. According to the invention, the construction method for using the conventional open type TBM to tunnel the hydraulictunnel for secondary lining is thoroughly changed, the synchronous lining is realized, the total construction period for the long and deep tunnel is shortened, the safety during the construction and the quality of the tunnel are greatly improved, and the construction cost is reduced.

The invention belongs to the technical field of subway construction, and particularly relates to a construction method for a shield tunnel to underneath pass through sensitive buildings in a shallow-buried soft stratum. Through the four steps of construction preparation, combined type pre-grouting reinforcement treatment on the stratum, construction testing in a non-underpass section, and passingthrough the sensitive buildings by a shield tunneling machine, ground surface settlement and deformation are effectively controlled during underneath passing of the shield tunneling machine, and the safety of the sensitive buildings is guaranteed.

The invention discloses a high-voltage transmission line inspection robot with multiple motion modes, which comprises a box body, a front mechanical arm, a middle mechanical arm, a rear mechanical armand a control system, wherein the front mechanical arm, the middle mechanical arm and the rear mechanical arm are sequentially arranged above the box body at intervals from front to back, and all themechanical arms are telescopic mechanical arms; the rear mechanical arm and the front mechanical arm are the same in structure and oppositely arranged on the left and right sides of the high-voltagetransmission line; the lower ends of the front mechanical arm and the rear mechanical arm are rotationally connected with the box body, and first walking wheels are arranged at the upper ends of the front mechanical arm and the rear mechanical arm and driven by a first servo motor; the lower end of the middle mechanical arm is movably connected with the box body through a horizontal guide mechanism, and a second walking wheel is arranged at the upper end of the middle mechanical arm and driven by a second servo motor arranged on the middle mechanical arm to rotate. The robot has the advantagesof being high in inspection speed, high in climbing, straight line and corner obstacle crossing capacity, high in automation degree, good in gravity center stability and capable of guaranteeing rapidand smooth electric power inspection.

The invention discloses a construction method for high-level large-diameter directional drilling of a complex roof. The construction method comprises the steps that a hole is drilled from a positive angle in a coal seam, and a guide directional hole of a casing hole section is drilled to penetrate through a roof and a weak broken layer to reach a stable extraction layer; then counterboring is performed along the guide directional hole of the casing hole section to the bottom of the hole; a protective casing is lowered from a hole opening to protect a hole section of the weak broken layer; holesealing materials are injected into the annulus of the protective casing and the drill hole wall to seal the protective casing; a measurement-while-drilling directional drilling tool assembly penetrates through the casing hole section, and drills a guide directional hole of a main extraction hole section to the design hole depth along a design trajectory; and the measurement-while-drilling directional drilling tool assembly is removed, and counterboring is carried out on the basis of the guide directional hole of the main extraction hole section, and hole drilling is finished in the form of open holes. Therefore, the difficulty in hole drilling and forming and interruption of borehole gas extraction due to the collapse of the hole wall of the weak broken layer during the construction of the main extraction hole section and in the later extraction process are avoided, the large-diameter counterboring is further implemented on the main extraction hole section by penetrating through thecasing hole section, and the gas extraction effect is improved.

The invention discloses a walking structure of a cleaning device for a photovoltaic power generation plate. The walking structure comprises a movable support frame vertically arranged on the surface of a photovoltaic power generation plate, wherein the movable support frame is provided with a sweeping component. When the movable support frame transversely moves along the surface of the photovoltaic power generation plate, the sweeping components is in charge of sweeping the surface of the photovoltaic power generation plate; the movable support frame is provided with a transverse movement driving wheel set and an inter-plate spanning wheel set; and the transverse movement driving wheel set drives the movable support frame to transversely move on the surface of the photovoltaic power generation plate. The inter-plate spanning wheel set drives the movable support frame to span a clearance between the two adjacent photovoltaic power generation plates. In the walking structure of the cleaning device for the photovoltaic power generation plate, unevenness between the adjacent photovoltaic power generation plates can be tolerated to the greatest extent, and the clearance between the adjacent photovoltaic power generation plates can be smoothly spanned. The walking structure has excellent moving performance.

The invention discloses an unmanned ship bridge crossing control method and device, electronic equipment and a storage medium. The unmanned ship bridge crossing control method comprises the steps: obtaining a bridge crossing control angle through calculation according to longitude and latitude of a bridge crossing starting point and a bridge crossing ending point obtained from a rear-end database; based on the current latitude and longitude of the unmanned ship, the course angle and the latitude and longitude of the bridge-crossing starting point, controlling the unmanned ship to travel to the bridge crossing starting point; adjusting the direction of the unmanned ship to enable the unmanned ship to coincide with the gap bridge control angle, then controlling the unmanned ship to drive into the bridge, and dynamically adjusting the course angle of the unmanned ship to enable the course angle to coincide with the gap bridge control angle when the unmanned ship passes through the bridge; calculating the current position information of the unmanned ship by adopting an inertial navigation algorithm based on the inertial data and the longitude and latitude of the unmanned ship before entering the bridge; based on the satellite signal data and the current position information of the unmanned ship, judging whether bridge crossing of the unmanned ship is finished or not, and if the satellite signal data and / or the current position information of the unmanned ship meet preset conditions, judging that bridge crossing of the unmanned ship is finished.

The invention relates to a preparation method of a lithium-sulfur battery diaphragm, comprising the steps of S1, providing a diaphragm base; and S2, forming a functional layer on at least one surfaceof the diaphragm base, to be specific, S21, laying a first carbon nanotube layer on at least one surface of the diaphragm base; S22, providing multiple manganese dioxide nanoparticles and multiple graphene oxide sheets, dispersing the multiple manganese dioxide nanoparticles and multiple graphene oxide sheets in a solvent to obtain a mixture, depositing the mixture evenly on the surface of the first carbon nanotube layer to form a first graphene oxide composite layer; S23, laying a second carbon nanotube layer on the surface of the first graphene oxide composite layer; S24, forming a second graphene oxide composite layer on the surface of the second carbon nanotube layer.

The invention discloses a balloon catheter, which comprises: a hypotube having an expansion chamber; an inner tube having an expansion chamber, and an outer tube having an outer diameter, wherein theinner tube is located inside the outer tube, the inner tube and the outer tube are coaxially arranged on the longitudinal axis, and a distal end of the hypotube is located between a proximal end of the outer tube and a proximal end of the inner tube; a balloon having only a tapered portion, wherein the proximal end of the balloon is coupled to the distal end of the outer tube, the distal end of the inner tube is positioned within the balloon and coupled to the distal end of the balloon; and a plurality of guide wires located between the inner tube and outer tube, wherein the proximal end of each guide wire is fixed to the distal end of the hypotube. The balloon catheter of the present invention can ensure the flexibility of the guide wire at the distal end while ensuring the pushing performance and anti-bendability of the guide wire at the distal end, and can smoothly pass the balloon catheter through the small lesion to improve the penetration performance of the balloon catheter.

The invention belongs to the technical field of cancericidal nuclide neutron knives and particularly discloses a core assembly and a method for increasing the irradiation flux of vertical epithermal neutron beams. A plurality of fuel rods and depleted uranium rods of a fuel assembly of the core assembly are arranged on the circumference of a plurality of concentric circles at unequal intervals on an upper grid plate and a lower grid plate respectively. The method comprises the following steps: 1, the power of a core is increased, and the arrangement of the fuel rods is determined; 2, a transition section is improved; wherein in the step 1, the power of the core is increased to 45 kw, and the fuel rods are arranged in non-uniform circle distances; improvement of the transition section comprises decreasing of lower beryllium piece thickness to 5 cm, decreasing of water layer thickness to 5 mm and increasing of lower cylinder bottom thickness to 52 mm. The assembly and the method have the advantages as follows: input proportion of the epithermal neutrons can be increased effectively, the output core neutron flux is increased, and the non-uniform coefficient of the core power is reduced.

The invention discloses a multifunctional rail car, which comprises a circular rotating platform, a vehicle frame, a telescopic rod, casters, a rotating shaft and a convex platform. The circular rotating platform is arranged on the top of The platform is connected to the loading platform through a rotating shaft, and the casters are connected to the frame through a telescopic rod. A shock absorbing spring is installed on the outside of the telescopic rod, a gasket is installed under the rotating shaft, and the rotating shaft is installed in the through hole. inside, and the rotating shaft and the through hole are connected in a gap, the bottom of the rotating shaft is installed with a bolt, the convex platform is fixed on the loading platform, the convex platform is connected with a supporting column, and the supporting column is internally set There is a rotating shaft on which a running wheel is installed, and a concave table is connected to the right side of the convex table. The invention increases the distance between the casters of the rail car to be greater than the distance between the cross tracks, so that the car body runs on a stable track, and a circular rotating platform is installed on the car body surface, which is beneficial to the adjustment of the product direction.

The invention relates to a convenient and fast stamping die. The convenient and fast stamping die comprises an upper die seat and a lower die seat. A die handle is arranged on the top surface of the upper die seat. An upper back plate is arranged below the upper die seat. A male die fixing plate is arranged below the upper back plate. A lower back plate is arranged above the lower die seat. A female die is arranged above the lower back plate. A blanking plate is arranged above the female die. A damping mechanism is arranged between the upper die seat and the lower die seat. A cavity is formedin the inner bottom face of the lower die seat. A mounting block body is arranged in the cavity through fixing bolts. A power mechanism is arranged at the center inside the mounting block body. Movingmechanisms are correspondingly arranged at the two ends inside the mounting block body. By the adoption of the convenient and fast stamping die, although a steel material makes the stamping die havea large weight, the stamping die is still easy to handle under the action of the moving mechanisms; when it is necessary to handle the stamping die by a small distance, it is not necessary to use a forklift or a crane, and the resources and energy are saved; the stamping die can also successfully cross obstacles; and the weighing capacity of the lower die seat is ensured.

The invention relates to a foundation pit project in the civil transportation construction industry, in particular to a construction method of an enclosure structure with ultra-short underground walls, wherein the enclosure structure is used for a foundation pit therebelow which is used for the construction of leading a tunnel to pass through a shield zone, and the method comprises the following steps: carrying out trench forming construction according to the size of each pair of the ultra-short underground walls to be constructed, wherein the bottom of the dug trench section is positioned not less than 0.5m above the top of a shield; then hoisting and placing a steel bar cage and filling concrete in the trench section for constructing the pair of the ultra-short underground walls; further carrying out the trench forming construction between the ultra-short underground walls for constructing the trench section which is vertical to the ultra-short underground walls, wherein the bottom of the trench section is leveled with the bottom of the trench section of the ultra-short underground walls; and hoisting and placing the steel bar cage and filling the concrete in the trench section for constructing transverse underground wall short walls. The construction method has the advantage of ensuring the smooth passing through of the shield at later stage; compared with the traditional practice of leading the shield to pass through glass fiber bar underground walls, the shield does not need to pass through the underground walls, thereby reducing the project risk and the cost.

The invention provides a medical composite hollow fiber tube. The medical composite hollow fiber tube comprises an inner layer, an outer layer and a middle reinforced layer, wherein the inner layer and the outer layer are hollow and coaxially nested, and the middle reinforced layer is arranged between the inner layer and the outer layer and comprises an axial telescopic knitting layer and reinforced fibre; the axial length of the middle reinforced layer is smaller than the axial length of the inner layer and the outer layer. Due to the specific structure of the medical composite hollow fiber tube, not only can the pushing performance and the support force of the tensile strength of the tube be ensured, but also the bendability and flexibility of the tube can also be greatly improved; medical intervention equipment manufactured by using the medical composite hollow fiber tube has better bending performance, so that it is ensured that the medical intervention equipment can smoothly pass through circuitous and tortuous blood vessels without folds; the medical intervention equipment is provided with a developing function through the arrangement of a developing ring so as to meet comprehensive performance requirements of the medical intervention device of minimally invasive blood vessels to the outer tube of a conveyor system.

The invention relates to a civil engineering traffic construction industry foundation pit project, in particular to an enclosure structure of the foundation pit which is used under the foundation pit and carries out the shield structure zone tunnel crossing construction; the enclosure structure with the ultrashort underground wall comprises underground walls, steel supports, reinforced concrete supports and reinforced concrete enclosing purlins which are arranged among the underground walls, and is characterized in that the underground wall of the foundation pit in the crossing section range of the shield structure is the ultrashort underground wall, the wall toe of which is arranged under the top of the shield structure by no less than 0.5m; the short wall support of the underground wall embedded under the bottom of the foundation pit is transversely arranged between every pair of ultrashort underground walls at both sides of the foundation pit; the wall toe of the short wall support of the underground wall is flush with the wall toe of the ultrashort underground wall; the enclosure structure has the advantages that the enclosure structure can ensure the smooth crossing of the later stage shield structure, and compared with the traditional shield structure which passes through the glass fiber reinforced plastic underground wall, the enclosure structure reduces the risk and construction cost of the project.

The invention discloses a cantilever end control device and a control method for towing construction of a curved light-weight I-beam bridge. The device comprises a tower, a cable and a short nose bridge; A tower is installed on each longitudinal I-beam of the I-beam, and the tower is located at the middle beam two spans in front of the I-beam pulling direction; one end of the stay cable is connected with a short nose beam through a connector, the middle part is erected on the top end of the tower, and the other end is connected with a cross beam of an adjacent span of the connected tower through a connector; the short nose beam is arranged at the front cantilever end in the pulling direction of the i-beam. The combined method of short nose beam and cable can fully adapt to the characteristics of light dead weight and curved alignment of I-beam bridge, and solve the problems that the conventional long guide beam cannot meet the requirements of the downward deflection of the cantilever end and the inherent torsional deformation of the curved beam end in the whole dragging process.

The invention relates to a voice data processing method for synchronizing information source voice data before vocoders. The method is characterized in that a manner of combining a pseudorandom sequence SYN1 and a single tone sequence SYN2 is used, and accurate synchronization of voice sample data of a circuit domain is realized. At an encoding end, L1+L2 original voice data are replaced with the sequences SYN1 and SYN2 respectively; at a decoding end, a coarse synchronization position is determined by solving the correlation peak of the SYN1, and an accurate synchronization position is determined by searching the cross-correlation peak of the SYN2. During mobile voice encryption communication, the lengths of the frames of various vocoders are different, the lengths and the starting points of information source encrypted frames and the vocoder frames are different, the truncation alignment deviation effect can be produced, the effect shows that the synchronous position might be leading or lagging, and thereby the voice encryption communication quality is affected directly. According to the method, the problem of the truncation alignment deviation effect is effectively solved, and the effect is remarkable.

The invention discloses a pipe jacking cover excavation construction method penetrating through an existing dense anchor cable area. The pipe jacking cover excavation construction method comprises the steps of rotary excavating pile construction, ground unloading, Larsen steel sheet pile construction, jet grouting pile construction, crown beam construction, top plate construction, remaining anchor cable cutting, concrete circular pipe empty pushing jacking, soil body backfilling and the like. The road traffic can be recovered as soon as possible, and anchor cable structures in the jacking pipe crossing section can be completely and thoroughly removed; a pipe jacking machine can be prevented from being clamped due to winding of steel strands, construction safety is guaranteed, the economy is reasonable, the construction efficiency is improved, and pipe jacking can penetrate through the existing anchor cable obstacle area as quickly and smoothly as possible; and the waterproof problem in a water-rich stratum in the foundation pit excavation and anchor cable breaking process can be solved, it can be guaranteed that the pipe jacking penetrates through the existing anchor cable obstacle area smoothly, reference experience is provided for pipe jacking construction to penetrate through the anchor cable area, and particularly construction experience is provided for pipe jacking construction to penetrate through the anchor cable area where the road traffic is urgently needed to be recovered.

The invention provides a control method of a multi-terminal offshore wind power flexible direct current sending-out system. The power exchange on the connecting lines among the multi-terminal systems can be effectively controlled through a control mode of superposing the compensation amount of the active power on the direct current voltage loop through a shore station control strategy, meanwhile, the two point-to-point systems can adopt the same control strategy, selection and switching between the control strategies are not needed, and smooth transition of the systems under various working conditions is guaranteed. The power flow among the multi-end systems is better controlled on the premise of solving the coordination control problem of the multi-end systems. Through an energy consumption device DBS control strategy, the energy consumption device can play a better role in the fault period, the system is helped to smoothly pass through the fault, when an alternating current system of a shore station at one end of the multi-end offshore wind power direct current sending-out system has a low-voltage fault, the DBS system needs to be used for absorbing surplus energy according to the fault condition, and meanwhile, the influence on other double-end systems can be ensured to be as small as possible.

The invention relates to the technical field of engineering detection, and discloses an underwater adsorption type obstacle crossing robot. The underwater adsorption type obstacle crossing robot comprises a bearing platform, wherein four corners of the bearing platform are connected with wheel feet through rotating joint legs, a sucker is arranged at the bottoms of the wheel feet, two driving wheels connected with a driving motor are arranged on the outer sides of the wheel feet, and a driven wheel is arranged on the inner sides of the wheel feet. The invention further discloses an obstacle crossing method of the underwater adsorption type obstacle crossing robot. According to the underwater adsorption type obstacle crossing robot and the obstacle crossing method thereof, the underwater adsorption type obstacle crossing robot can climb along the surfaces of concrete structure bodies of various grades and can smoothly span different types of obstacles, the working depth is large, the efficiency is high, and the obstacle crossing capacity is high.

The invention provides a method for constructing a foundation pit with circulating steel supports. The method for constructing the foundation pit with the circulating steel supports comprises the following steps that a construction area of the foundation pit is divided into a plurality of sections in the length direction of the foundation pit, and each section of the construction area of the foundation pit is sequentially subjected to vertical support structure construction, enclosing purlin installation, steel support installation and foundation pit excavation section by section, the verticalsupport structure construction comprises the steps of embedding two rows of vertical support structures on two sides of the construction area of the foundation pit in the length direction of the foundation pit, and the tops of the vertical support structures are exposed to the earthwork of the foundation pit; the enclosing purlin installation comprises the steps that the enclosing purlins are arranged on the opposite inner sides of the exposed tops of the each row of the vertical support structure in the length direction of the foundation pit; and the steel support installation comprises thesteps that the steel supports are detachably installed between the purlins on two sides; and after the excavation of the foundation pit in the each section of the construction area of the foundation pit, the steel supports used in the completed section are removed on the purlins as the steel supports for the construction of the next section of the construction area of the foundation pit. The steelsupports of the invention can be used in a circulating mode and have good economy.

The invention discloses an integrated scroll compressor and a dynamic process oscillation suppression method and device thereof. The method comprises: after an oscillation occurs in the dynamic process of the integrated scroll compressor, determining whether the oscillation is a small oscillation or a large oscillation according to a constructed linear discriminator,; when the oscillation is a small oscillation, increasing the quadrature-axis component in the output voltage of the motor to suppress the small oscillation; when the oscillation is a large oscillation, increasing the quadrature-axis component in the output voltage of the motor and modulating the output frequency of a frequency converter according to the change value of a DC bus current to suppress the large oscillation. The method can proactively suppress the oscillation generated by the dynamic process of the integrated scroll compressor, so that the motor of the integrated scroll compressor can smoothly pass through an unstable region which may be encountered in the acceleration process or the deceleration process.

The invention discloses a positioning buckle column and a heat dissipating device using the same. The heat dissipating device comprises a substrate and a plurality of positioning buckle columns. The substrate has a plurality of heat radiation fins and a plurality of positioning holes. And the plurality of positioning buckle columns are respectively penetratedly arranged in the positioning holes. Besides, each of the positioning buckle columns includes a round bar, a head, a collar, an elastic component and a clamping part. The round bar has at least two different rod diameters; the head is at one end of the round bar; the collar is nested at a portion that at an connection position of the two different rod diameters and has the smaller rod diameter; and the elastic component is nested at the round bar and is also arranged between the head and the collar. In addition, the substrate is arranged between the elastic component and the collar; and the clamping part is at the other opposite end of the round bar.

The invention discloses a voice data processing method for vocoder forward information source voice data synchronization. The method comprises: a coding step includes: a pre device receives one group of to-be-transmitted audio data; and SYN1 and SYN2 are established and are used for replacing unencrypted audio data in the to-be-transmitted audio data. A decoding step includes: a maximum correlation value of a pseudorandom sequence is calculated; if the maximum correlation value of the pseudorandom sequence is larger than or equal to a random sequence threshold value, SYN1 existence in the audio data is determined and the position of the SYN1 is determined; a maximum correlation value of a single-tone sequence is calculated; if the maximum correlation value of the single-tone sequence is larger than or equal to a single-tone sequence threshold value, a precise tracking effective mark is calculated; and if the precise tracking effective mark is equal to 1, SYN2 existence in the audio data is determined and the position of the SYN2 is determined. Therefore, fidelity of audio data transmission is improved and the interference on the audio data during transmission can be prevented.

The invention discloses a low-voltage traversing control method for a double-fed wind power generation system. The method comprises the following steps of: 1) detecting zero frequency transient component flux of a motor; 2) when the motor has zero frequency transient component flux outburst, controlling a rotor current transformer and a network current transformer, and attenuating the zero frequency transient flux components of the current transformers; and 3) controlling torque current and power grid reactive compensation current to inhibit the growth of harmful voltage and prevent the formation of harmful current. The method can really realize the elimination of the transient flux caused by sudden decline and sudden rise of a stator voltage and inhibit negative sequence current so as to avoid offline of the fan power generation system at the same time of protecting the rotor current transformer and the network current transformer; meanwhile, by the method, double times ultrahigh dangerous voltage of rotor induction caused by transient flux superposition when the voltage is recovered can be prevented, and power grid-friendly intelligent low-voltage traversing is realized.