640 results about "Dynamo" patented technology

The invention relates to the technical field of electrical monitoring, provides a general generator electrical monitoring system with a fault self-diagnosis function, and aims to deeply excavate potential correlation between electrical and mechanical parameters by judging a coherence coefficient and a phase difference between a current harmonic component and a bearing vibration frequency band and marking a fault coupling identifier by using a coupling mode library. Electrical and mechanical coupling faults can be accurately identified, and the identification capability of complex faults can be greatly improved; meanwhile, the diagnosis threshold is dynamically adjusted in combination with the load rate and the winding temperature, so that the system can better adapt to different operation conditions of the generator, and the diagnosis accuracy and reliability are improved; the fault causal chain is analyzed through the causal inference algorithm, and the fault source is positioned, so that compared with the existing fault tracing mode lacking systematicness, the fault generation reason and process can be analyzed more comprehensively and deeply, the fault source can be positioned quickly and accurately, operation and maintenance personnel can take targeted measures in time, and the fault tracing efficiency is improved. And the operation safety and reliability of the generator are improved.

The invention relates to the technical field of photovoltaic grid connection, and particularly provides an active support control method and an active support control device for transient voltage of a transmitting end power grid of an LCC-HVDC (line commutated converter high voltage direct current power transmission) system, and the active support control method and the active support control device for the transient voltage of the transmitting end power grid of the LCC-HVDC system. Comprising the following steps: correcting an output voltage phase of a synchronization link in a virtual synchronous generator control strategy based on active power and frequency output by a network construction type photovoltaic converter, and correcting an output voltage amplitude of a voltage amplitude link in the virtual synchronous generator control strategy based on a measured value of a sending end power grid voltage; and using the virtual synchronous generator control strategy to control the network construction type photovoltaic current converter in the LCC-HVDC system containing the network construction type photovoltaic current converter. According to the technical scheme provided by the invention, the stability of photovoltaic access to the weak power grid can be improved, and the reactive power output by the converter can be automatically adjusted after the transient voltage of the sending-end power grid occurs due to the commutation failure of the LCC-HVDC system, so that the transient voltage is effectively supported, and the phenomenon of reverse adjustment of the reactive power is prevented.

The invention relates to a cleaning basket and a cleaning machine having the cleaning basket. The cleaning basket is provided with a spray arm, a first impeller, a first magnetic part, a second magnetic part, a generator, an AC / DC conversion module and an electrolysis module. The cleaning basket is convenient to be combined with a water tank to form a cleaning machine. When in use, the cleaning basket is placed in the water tank, and the rotation of the second magnetic part drives the first magnetic part, the spray arm and the first impeller to rotate, so that water at the bottom of the cleaning basket is drawn into the spray arm and further sprayed upward, and the cleaning effect is improved in cooperation with the turbulent water flow. When it is not needed to be used as a cleaning machine, the cleaning basket is taken out of the water tank and can be used as an ordinary water tank, thereby improving the space utilization rate of the water tank. The rotation of the second impeller is used to make the generator generate electricity to supply power to the electrolysis module, so that it is not necessary to connect the electrolysis module to a power supply outside the water tank through a power cord, thereby simplifying the overall structure. The turbulent water flow is conducive to uniformly dispersing free hydroxyl groups generated by the electrolysis module, thereby improving the cleaning effect.

Disclosed herein are systems and methods for electrically modulating tissue. Systems can include a current generator; at least one implantable working electrode, the at least one implantable working electrode configured to be in electrical communication with the current generator; at least one indifferent electrode; and a controller configured to signal the current generator to: generate a set of currents with a set of initial polarities to be delivered to the working electrodes; and wherein the at least one indifferent electrode absorbs a bias current which is equal in magnitude and opposite in polarity to a summation of the set of currents.

The invention relates to the technical field of inverter control, and discloses a VSG-based inverter phase-locked loop-free pre-synchronization method, system and device and a medium, and the method comprises the steps: eliminating the voltage deviation between the VSG inverter voltage of a virtual synchronous generator and the output voltage of a micro-grid through a deviation integral feedback method; a general signal delay superposition operator is adopted to filter the power grid voltage so as to construct virtual power, then the virtual power is introduced into an active-frequency loop of the virtual synchronous generator as a feedback signal, and a power angle feedback control model is formed so as to adjust the VSG inverter voltage; and detecting the voltage deviation between the power grid voltage and the adjusted VSG inverter voltage in real time, and when it is judged that the voltage deviation is smaller than a deviation threshold value, generating a grid-connected connection point switching-on instruction and controlling a switch of a grid-connected connection point to be switched on, so that phase-locked loop-free pre-synchronization of the distributed power supply inverter is realized, the grid-connected stability of the distributed power supply inverter is enhanced, and the grid-connected stability of the distributed power supply inverter is improved. And the current and voltage impact of the grid-connected instant system is reduced.

The invention discloses a self-powered multifunctional wireless sensing system based on a wind energy friction nano-generator, which comprises a self-powered module, the self-powered module is provided with the wind energy friction nano-generator capable of generating alternating current, and the self-powered module comprises a supporting seat and a friction power generation assembly fixedly assembled on the supporting seat; the friction power generation assembly comprises a wind energy rotating mechanism, an FEP film sleeve layer, a first power generation copper electrode set and a second power generation copper electrode set, the first power generation copper electrode set and the second power generation copper electrode set are fixedly attached to the outer side of the fixing cylinder, and the FEP film sleeve layer is connected to the outer side of the first power generation copper electrode set and the outer side of the second power generation copper electrode set in a sleeving mode. The wind energy rotating mechanism is connected to the outer side of the FEP film sleeve layer in a sliding and sleeving mode. Two copper foil sheets are arranged in the wind energy rotating mechanism; the wireless sensing module is electrically connected with the first power generation copper electrode group, and the wired energy supply module is electrically connected with the second power generation copper electrode group. The friction nanometer generator can supply power to the wireless unit and the wired unit at the same time, and the utilization efficiency of the friction nanometer generator on wind energy is improved.

A dynamo-electric rotary machine includes a rotor defining an axis, a stator, and a can designed for arrangement in an air gap between the rotor and the stator in order to seal the stator and the rotor in relation to each other. The can has at least one section of average electrical conductivity in a range from 1 S / m to 10000 S / m in an axial and / or a tangential direction. The can is electrically conductively incorporated in an earthing system of the dynamo-electric machine.

The invention discloses a fault diagnosis method for an H-bridge half-controlled rectifier of an electro-magnetic doubly salient generator, and relates to the field of electro-magnetic doubly salient generators, the method is developed based on an improved H-bridge half-controlled rectifier topological structure, and the improved H-bridge half-controlled rectifier topological structure is additionally provided with a current sensor for each phase of armature winding. The leads of the left and right bridge arms connected with each phase of armature winding are wound on the current sensor in a winding manner, so that each phase of current sensor can obtain more current information; open-circuit fault diagnosis can be realized through current measured by a current sensor wound by a working two-phase armature winding in each sector, the method is small in calculation amount and easy to realize, is not influenced by rotating speed or load change, is also not influenced by fault occurrence positions and conduction angle change, can realize single-tube, double-tube and multi-tube fault positioning, and can be applied to the field of fault diagnosis. The diagnosis effect is good; and the application range is wide.

The invention relates to an AC / DC generator regulator control method, system and device and a medium, and the method comprises the steps: obtaining the real-time load data and environment data of a generator, carrying out the preprocessing of the real-time load data and environment data of the generator, and obtaining the preprocessed data; transmitting the preprocessed data to a pre-trained load prediction model for comparative analysis to obtain a load prediction result; generating a preliminary control strategy of the generator according to the load prediction result; constructing a virtual model of the generator by using a digital twin condition, simulating states of the generator under different loads and operation, optimizing parameters of the preliminary control strategy based on virtual simulation data, and generating an optimization strategy of the generator; and based on the optimization strategy of the generator, the operation parameters of the generator are adjusted by applying a self-adaptive anti-interference control and fuzzy control algorithm so as to realize stable and efficient operation. The method has the effect of improving the adjustment precision of the generator.

The present application relates to a method for optimizing the layout of building masonry based on Dynamo, which uses Revit to establish parametric block families and parametric mortar joint families and generate horizontally nested families of middle bricks, nested families of base bricks, and nested families of back-filled bricks. Layout plans of various masonry types are established based on the horizontally nested families of middle bricks. The layout plan outputs the length of the left half brick and the length of the right half brick. The layout plan is written as a Dynamo node. After being imported into the wall, the masonry type is determined according to the wall length and the wall layout is generated. The present application solves the problem that the limitations of brick arrangement design restrict the secondary deepening design during the construction process. The present application can simplify the design steps, realize the coordination of design results and parameter changes, and improve the efficiency of secondary deepening.

A high power (HP) generator (10) and method for delivering pulsed high power at high voltage and / or current values ​​to a capacitive load, in particular a plasma process, comprising: - several low power (LP) generators (14, 16, 18), each including an energy storage component (C1, L1), wherein, during use, the energy storage component (C1, L1) is charged to a predetermined value associated with the energy storage component; Each provides, when in use, at its output an LP generator value that corresponds to the value of the energy storage components (C1, C2, Cn, L1, L2, Ln) incorporated in the respective LP generator (14, 16, 18) Several LP generators (14, 16, 18) and - a coupling (20), the LP generators (14, 16, 18) being electrically connected such that a coupling value at an output of the coupling (20) can be obtained which corresponds to an output value of the HP generator (10) and which is higher than the LP generator value at the output of one of the LP generators (14, 16, 18) during use, at least in some states of the HP generator (10); - a control unit (22) configured to select the contribution of the LP generators (14, 16, 18) to the output value of the HP generator (10) during the power delivery of the HP generator (10) in order to produce a rise and / or a decay of a pulse at the output of the coupling (20); Including, A high power (HP) generator (10) and method, wherein a damping circuit (50) is positioned in an open chain configuration between some, particularly all, of the LP generators (14, 16, 18), and in particular the damping circuit (50) includes a resistor (R) and / or an inductor (L).

A high power (HP) generator (10) and a method for delivering pulsed high power at high voltage and / or current values ​​to a capacitive load, in particular a plasma process, comprising: - several low power (LP) generators (14, 16, 18), each including an energy storage component (C1, L1), wherein, during use, the energy storage component (C1, L1) is charged to a predetermined value associated with the energy storage component; Each provides, when in use, at its output an LP generator value that corresponds to the value of the energy storage components (C1, C2, Cn, L1, L2, Ln) incorporated in the respective LP generator (14, 16, 18) Several LP generators (14, 16, 18) and - a coupling (20), the LP generators (14, 16, 18) being electrically connected such that a coupling value at an output of the coupling (20) can be obtained which corresponds to an output value of the HP generator (10) and which is higher than the LP generator value at the output of one of the LP generators (14, 16, 18) during use, at least in some states of the HP generator (10); - a control unit (22) configured to select the contribution of the LP generators (14, 16, 18) to the output value of the HP generator (10) during the power delivery of the HP generator (10) in order to produce a rise and / or a decay of a pulse at the output of the coupling (20); Including, - A balancing circuit containing components that allow current to flow in only one direction, in particular a diode (D) or a component acting like a diode, is connected between the two LP generators (14, 16, 18).

A high power (HP) generator (10) and a method for delivering pulsed high power at high voltage and / or current values ​​to a capacitive load, in particular a plasma process, comprising: - several low power (LP) generators (14, 16, 18), each including an energy storage component (C1, L1), wherein, during use, the energy storage component (C1, L1) is charged to a predetermined value associated with the energy storage component; Each provides, when in use, at its output an LP generator value that corresponds to the value of the energy storage components (C1, C2, Cn, L1, L2, Ln) incorporated in the respective LP generator (14, 16, 18) Several LP generators (14, 16, 18) and - a coupling (20), the LP generators (14, 16, 18) being electrically connected such that a coupling value at an output of the coupling (20) can be obtained which corresponds to an output value of the HP generator (10) and which is higher than the LP generator value at the output of one of the LP generators (14, 16, 18) during use, at least in some states of the HP generator (10); - a control unit (22) configured to select the contribution of the LP generators (14, 16, 18) to the output value of the HP generator (10) during the power delivery of the HP generator (10) in order to produce a rise and / or a decay of a pulse at the output of the coupling (20); Including, The control unit (22) is further configured to select the contribution of the LP generators (14, 16, 18) in a galvanically isolated manner, in particular via a fiber optic connection or a magnetic coupling.

A high power (HP) generator (10) and a method for delivering pulsed high power at high voltage and / or current values ​​to a capacitive load, in particular a plasma process, comprising: - several low power (LP) generators (14, 16, 18), each LP generator (14, 16, 18) includes an energy storage component (C1, L1), and in use, the energy storage component (C1, L1) is charged to a predetermined value associated with the energy storage component; each LP generator (14, 16, 18) when in use provides at its output an LP generator value corresponding to the value of an energy storage component (C1, C2, Cn, L1, L2, Ln) incorporated in the respective LP generator (14, 16, 18); Several low power (LP) generators (14, 16, 18); - a coupling (20), the LP generators (14, 16, 18) being electrically connected such that a coupling value at an output of the coupling (20) can be obtained which corresponds to an output value of the HP generator (10) and which is higher than the LP generator value at the output of one of the LP generators (14, 16, 18) during use, at least in some states of the HP generator (10); - a control unit (22) configured to select the contribution of the LP generators (14, 16, 18) to the output value of the HP generator (10) during the power delivery of the HP generator (10) in order to produce a rise and / or a decay of a pulse at the output of the coupling (20); Including, At least one, preferably several and most preferably all LP generators (14, 16, 18) comprise an LP generator value limiting circuit (151), e.g. a voltage limiting circuit or a current limiting circuit.

The invention belongs to the technical field of safety protection of large generators, and particularly discloses a slot potential-based ground fault arc extinction and TVS fault identification method and system. The fundamental wave slot potential and the third harmonic slot potential of each slot conductor are calculated by obtaining the fundamental wave and third harmonic voltage of the neutral point and the generator end of the generator. And furthermore, the real fault position is determined through matching with the ground fault potential, so that fault positioning at any position in a full winding range is realized, the limitation of a traditional method is broken through, and the coverage range of fault positioning is remarkably expanded. According to the invention, through the voltage and current low-frequency components of the neutral point of the generator, the grounding transition resistance during a grounding fault and the grounding transition resistance during stabilization after arc extinction are respectively calculated, and the fault property is judged by comparing the transition resistances in different states, so that an instantaneous fault and a permanent fault can be accurately distinguished; simple and effective fault identification is provided, engineering realization is easy, and fault properties can be rapidly and accurately judged.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

The invention relates to the technical field of bridge construction, in particular to a method for creating a bridge component based on Revit and Dynamo. The method comprises the following steps: S1, dividing bridge components into a point-based model and a line-based model, and respectively setting two automatic modeling programs; s2, establishing a parameterized family based on a point model, and loading the parameterized family into Revit; s3, reading the parameter data in the excel table; s4, using data to complete model size modification and automatic accurate positioning; s5, establishing a parameterized family based on a line model, and loading the parameterized family into Revit; s6, determining starting and ending point positions of the linear component; s7, determining a vertical offset distance; and S8, generating a model instance, and automatically modifying instance size parameters in batches. An excel table is read through Dynamo, parameters are automatically given to instance parameters in the model, data are used for driving parameterized model families, the model is automatically generated, and the model precision and the construction efficiency are remarkably improved. The method is mainly applied to the aspect of automatically creating the fabricated bridge member.

The invention relates to the technical field of micro-grids, and discloses an AC micro-grid distributed power control method with quantitative event triggering. According to the method, due to droop control in an island DC micro-grid, distribution of reactive power and unbalanced power in a system cannot be guaranteed, and a distributed control method with quantitative event triggering is provided for solving the problem. According to the control scheme provided by the invention, communication is reduced on the basis of realizing reactive power and unbalanced power distribution among distributed power generation units by adding a designed distributed secondary controller with a quantitative event triggering method, and parts which cannot be accurately distributed can be readjusted by a negative feedback system through PI control; in addition, the proposed method does not need global power information, each distributed generator only communicates with a neighbor when meeting a triggering condition, the communication burden of a micro-grid communication network is greatly reduced, the stability of the method is proved through a Russell invariant set principle, and Zeno behaviors are also eliminated through an anti-security method.

The invention provides a network construction type converter control method suitable for multiple power grid intensities, and belongs to the field of new energy grid-connected stability. The method comprises the steps that the actual output power of an inverter is calculated according to inverter side capacitor voltage and grid-connected current; the actual output power of the inverter and the power reference value control an output internal potential amplitude reference value and an internal potential phase angle through the virtual synchronous generator; subtracting the voltage drop of the grid-connected current on the virtual impedance from the internal potential amplitude reference value to obtain a virtual internal potential; inputting the virtual internal potential as a reference voltage into a voltage and current double-loop controller, inputting a grid-connected current into a proportional differential controller, subtracting the output of the proportional differential controller from the output of the voltage and current double-loop controller, inputting an obtained result into an inverter through an SPWM modulator, and controlling the inverter; the invention also provides a control system of the network-forming converter. Grid-connected current proportional differential feedback is introduced, the inner loop control bandwidth is kept constant in the dynamic change process of the power grid strength, and power-voltage loop harmful coupling is eliminated.

A power backup system is provided for low power outdoor applications. The power backup system comprises a generator, a battery pack, a bus connecting the generator to the battery pack, and a current manager. The battery pack is connected to the bus in a series of parallel conductor paths. A voltage drop across a selected conductor path is different than other voltage drops across the other conductor paths. The current manager is configured to manage current between the generator and the battery pack based on bus voltage.

The invention relates to the technical field of generator operation and maintenance, in particular to a permanent magnet generator short circuit fault monitoring and diagnosis method based on a diagnosis winding, which comprises the following steps: acquiring no-load back electromotive force signals in a normal operation state and various typical fault states of a permanent magnet generator, and constructing a normal feature data set and a fault feature data set; acquiring a no-load back electromotive force signal of the permanent magnet generator in the current operation state; comparing the obtained current no-load back electromotive force signal with the normal characteristic data set, and judging the current working state of the permanent magnet generator; if it is judged that the current working state of the permanent magnet generator is in the fault state, the obtained current no-load back electromotive force signal is compared with the fault feature data set. In combination with a data processing algorithm, the diagnosis winding can continuously monitor the operation state of the permanent magnet generator, compares the current operation parameters with the preset reference experiment data, accurately evaluates the health state of the winding, and monitors and diagnoses faults such as turn-to-turn short circuit in real time.

A method for controlling a power generating asset having a generator with a stator operably coupled to a transformer and a rotor operably coupled to the transformer via a power converter includes using an angle of a phase-locked loop (PLL) reference signal of a PLL at a PLL reference node of the power generating asset to transform a three-phase set of signals to a two-dimensional orthogonal coordinate system of a synchronously rotating frame. The two-dimensional orthogonal coordinate system includes x and y components of at least one of voltage and current. The method also includes determining one or more dynamic decoupling factors as a function of one or more of the x and y components of at least one of voltage and current. Further, the method includes applying the one or more dynamic decoupling factors to current command calculation logic to mitigate a coupling effect of one or more current command components.

The invention relates to a composite function converter suitable for a multi-phase high-speed permanent magnet direct-current generator. An uncontrolled rectifier bridge arm is formed by connecting two high-frequency rectifier diodes in series; the controllable rectifier bridge arm is formed by connecting two IGBTs (Insulated Gate Bipolar Translator) with antiparallel diodes in series; an upper tube IGBT collector of the controllable rectifier bridge arm and a cathode of an upper tube diode of the uncontrolled rectifier bridge arm are connected in parallel with an anode of the intermediate bus capacitor; the emitting electrode of the lower tube IGBT and the anode of the lower tube diode of the uncontrolled rectifier bridge arm are connected in parallel with the cathode of the intermediate bus capacitor; the emitting electrodes of the upper tubes IGBT of the controllable rectifier bridge arms are respectively connected to the output end of the generator; the anodes of the upper diodes of the uncontrolled rectifier bridge arms are respectively connected to the other output ends of the generator; the interleaved BUCK module is connected between the intermediate DC bus capacitor and the load, and the BUCK control unit is used for controlling the interleaved BUCK module to operate; and the barring control unit is used for controlling the controllable rectifier bridge arm to realize a generator barring function.

A high power (HP) generator (10) configured to deliver pulsed high power of high voltage and / or current values ​​to a capacitive load, in particular to a plasma process, - several low power (LP) generators (14, 16, 18), each including an energy storage component (C1, L1), wherein, during use, the energy storage component (C1, L1) is charged to a predetermined value associated with the energy storage component; Each provides, when in use, at its output an LP generator value that corresponds to the value of the energy storage components (C1, C2, Cn, L1, L2, Ln) incorporated in the respective LP generator (14, 16, 18) Several LP generators (14, 16, 18) and - a coupling (20), the LP generators (14, 16, 18) being electrically connected such that a coupling value at an output of the coupling (20) can be obtained which corresponds to an output value of the HP generator (10) and which is higher than the LP generator value at the output of one of the LP generators (14, 16, 18) during use, at least in some states of the HP generator (10); - a control unit (22) configured to select the contribution of the LP generators (14, 16, 18) to the output value of the HP generator (10) during the power delivery of the HP generator (10) in order to produce a rise and / or a decay of a pulse at the output of the coupling (20); Including, - a control unit (22) have a current boost capability of at least 10 A / μs, and / or Capable of withstanding voltages of approximately 0.5 kV or more with a voltage change rate of 15 kV / μs or more It further includes switching units (24, 26, 28).

The invention discloses a brushless air-core pulse generator and supercapacitor hybrid energy storage self-excitation type pulse power supply topological structure and a control method, and relates to the field of pulse power supplies. The problems that in the prior art, a storage battery is high in energy storage density, low in power density, short in large-current cycle life, low in high-voltage charging speed and high in step-up ratio, so that a step-up converter between the storage battery and a super capacitor works in a near-saturation working condition, and the charging speed and the charging linearity are seriously affected are solved. The self-excitation pulse power supply topological structure comprises a prime motor, a brushless air-core pulse generator, a self-excitation charging rectifier bridge, a pulse capacitor bank and a load. The prime motor is coaxially connected with a rotor of the brushless hollow pulse generator; the self-excitation charging rectifier bridge is connected in series with the brushless air-core pulse generator and the pulse capacitor bank; and the brushless air core pulse generator and the pulse capacitor bank discharge to a load together in a parallel connection mode. The method is also suitable for the hybrid energy storage field based on three forms of inertia, magnetic field and electric field.

The invention discloses a shipborne portable wave power generation component which comprises a sea-snake-shaped floating shell, a closed cabin is arranged in the sea-snake-shaped floating shell, an air gap is formed between the closed cabin and the sea-snake-shaped floating shell, and the closed cabin is connected with the bottom of the sea-snake-shaped floating shell through an interference spring. A friction nanometer generator is installed in a closed cabin, a main body is of a stacked structure and sequentially comprises a friction film, an induction electrode layer and a power generation electrode substrate from top to bottom, a polytetrafluoroethylene ball and a limiting cover are arranged on the upper surface of the main body, and elastic films are arranged at the two ends of the limiting cover; when the power generation component floats under the action of waves, the polytetrafluoroethylene balls roll on the friction film to generate friction, so that charges are transferred, inductive charges are generated on the inductive electrode layer, and the inductive charges are led out through an external circuit to generate alternating current. The invention further discloses application of the power generation component. The device is good in durability, high in output power, simple in structure, low in manufacturing cost and convenient to carry.

The hydraulic self-driven anti-corrosion layer structure is characterized in that an annular groove is formed in the pipe wall of the joint of the ring type steel pipe, and the anti-corrosion layer structure is arranged at the annular groove; comprising an anode metal layer arranged on the outer side of a steel pipe, a CNF film serving as a positive electrode of the nano friction generator and a PDMS film serving as a negative electrode of the nano friction generator, the CNF film and the PDMS film are sequentially arranged on the inner side of the steel pipe, a wire is arranged on the inner side of the CNF film and connected with a copper foil contact piece in the anode metal layer, and a wire is arranged on the inner side of the PDMS film and connected with a copper foil contact piece in the steel pipe. Double mechanisms of physical corrosion prevention and electrochemical corrosion prevention are fused, and a more comprehensive and efficient solution is provided for pipeline corrosion prevention. The service life of the steel structure pipeline is remarkably prolonged, and the water quality safety of drinking water is continuously guaranteed in the long-term service process of the pipeline. And meanwhile, the design further has a potential steel pipe repairing function, and extra guarantee is provided for long-term stable operation of the pipeline.

The invention relates to a model selection method and device of large-scale generator iron core magnetization test equipment, computer equipment, a computer readable storage medium and a computer program product, and can be used in the technical field of electric power. The method comprises the following steps: determining excitation parameters of the generator according to a preset number of turns of an excitation coil of the generator and iron core parameters of the generator; determining a maximum voltage value from the voltage values of the excitation coil, and determining a maximum current value from the current values of the excitation coil; determining cable configuration information of the excitation coil according to the maximum voltage value and the maximum current value; according to the iron core parameters, iron core loss values are determined, and the maximum iron core loss value is determined from the iron core loss values; and determining equipment configuration information of the iron core magnetization test equipment of the generator according to the maximum iron core loss value, the maximum voltage value and the maximum current value. By adopting the method, the efficiency of determining the configuration information of the iron core magnetization test equipment of the generator can be improved.

The invention provides a generator output impedance measurement circuit and measurement method, relates to the technical field of power supply system design, and is used for improving the measurement accuracy of generator output impedance. The circuit comprises an upper computer, a main circuit and a measuring circuit, the main circuit comprises a generator equivalent circuit and a circuit load equivalent circuit, and the measuring circuit comprises a harmonic injection circuit and a sampling circuit. The harmonic injection circuit is connected with the generator equivalent circuit and the circuit load equivalent circuit; the impedance of the generator equivalent circuit is lower than that of the circuit load equivalent circuit; the upper computer is connected with the harmonic injection circuit and the sampling circuit, and the upper computer is used for setting harmonic injection parameters and injecting voltage disturbance signals with different frequencies into the main circuit through the harmonic injection circuit according to the harmonic injection parameters; and the sampling circuit is used for collecting voltage and current between the generator equivalent circuit and the harmonic injection circuit within a preset time of injecting the voltage disturbance signal, and transmitting the collected voltage and current to the upper computer.