156 results about "Power absorption" patented technology

The invention relates to a network construction type energy storage device overload control protection method, system, equipment and medium, and the method comprises the steps: switching an energy storage converter to an overload mode after receiving a short-time overload instruction of a power grid, and determining whether the current short-time power is within a preset maximum limit or not; if yes, the highest starting temperature of the energy storage converter and the battery in the corresponding overload scene is obtained, whether the real-time temperature is lower than the temperature or not is compared, and whether the SOC of the battery is appropriate or not is checked. And after the condition is met, injecting or absorbing power into the power grid according to the overload multiple. And monitoring the temperature and duration of the converter during overload, executing a protection strategy if the maximum allowable value or time is exceeded, otherwise, ending overload response, and returning to a normal mode. According to the method, the overall stability of the power grid and the operation safety of the energy storage equipment are improved, and especially in a weak power grid environment, frequency and voltage fluctuation caused by external disturbance is effectively dealt with.

The invention relates to a low-voltage distribution network non-power-off online ice melting method based on mobile power supply equipment, and the method comprises the following steps: obtaining meteorological information, and line parameter information and line icing information of a low-voltage distribution network; according to the meteorological information, the line parameter information and the line icing information, calculating the minimum ice melting current required by the icing line and the ice melting line power under the minimum ice melting current; and selecting to deploy a first mobile power supply device for transmitting power, or deploying a second mobile power supply device and the first mobile power supply device for transmitting power and absorbing power respectively, so as to carry out ice melting operation based on the ice melting line power. Ice melting can be carried out without power outage, and the supporting capacity of a distribution network line for coping with extremely cold climate is improved.

The invention relates to a three-phase imbalance treatment method and a micro-energy regulator, and belongs to the technical field of power supply systems. The method comprises the steps that when a three-phase imbalance phenomenon occurs, the three-phase imbalance degree is obtained according to the maximum power deviation between phases and the total power of the three phases; when the three-phase unbalance degree is greater than a preset unbalance degree, calculating the single-phase power deviation of each phase according to the three-phase average power and the single-phase power of each phase; comparing the three-phase total power with a preset transformer area load rate, and when the three-phase total power is greater than the preset transformer area load rate, storing energy and discharging; if yes, the single-phase power deviation needs to be updated according to corresponding design requirements; for energy storage, the total discharge power or the total power absorption power of each phase is determined according to the updated single-phase power deviation, proportional gain and integral gain; and discharging or absorbing electricity for each phase until the total discharging power or the total electricity absorbing power of each phase is met. According to the invention, the phenomenon of heavy load or return of the transformer area can be reduced.

The invention relates to a product test repairing method and system, and relates to the technical field of product testing, and the method comprises the steps: obtaining a test position and a test parameter; when the test parameter is inconsistent with the reference parameter, defining the test position as an abnormal position, and calculating the difference between the test parameter and the reference parameter as an abnormal parameter; when the abnormal parameter is a positive value, controlling the cutting device to cut according to the abnormal parameter according to the test position; according to the abnormal parameters, air suction power is determined, and a recovery device is controlled to recover the cut materials; when the abnormal parameter is a negative value, the specification of the recycled material is obtained; determining whether the recycled material specification is greater than the abnormal specification; if yes, the splicing shape is determined according to the specification of the recycled material; controlling a repairing device to repair according to the splicing shape and the abnormal position; and if not, controlling the repairing device to repair according to the repairing material, controlling the polishing device to polish the product and obtaining the test parameters again. The method has the effect of reducing energy consumption.

The invention provides a multi-direct-current power transmission line power optimization method and device giving consideration to supply guarantee and consumption. The method comprises the steps of carrying out initial configuration, simulating source load characteristics of a transmitting end and a receiving end, proposing a load loss probability and a renewable energy power abandoning rate index, constructing a multi-objective function for multi-loop direct current power optimization, constructing a multi-loop direct current line safety constraint, constructing a positive and negative rotation standby calling constraint, solving by a solver and outputting a result. The invention specifically provides a cross-regional multi-direct-current transmission line power model under the background of high-proportion new energy, provides a Monte Carlo method for simulating load characteristics of a transmitting end and a receiving end and fluctuation characteristics of new energy, provides a load loss probability and a renewable energy power abandoning rate index, and further realizes multi-target collaborative optimization of the multi-direct-current transmission line. The method can achieve the modeling of a power model of the cross-regional multi-DC transmission line under the background of high-proportion new energy, helps to achieve the day-ahead optimal scheduling of a multi-DC line power grid, is large in engineering application potential, will effectively support the optimal scheduling of a multi-circuit DC line, and provides a basic guarantee for the safe and economical operation of a system.

A method for allocating an available power B avl suppliable from a source (S) to a plurality of M users of a vehicle (V). The method comprises defining a priority order of the M users, which identifies, for each N-th user in the plurality of M users, a first set comprising the 1st to the (N-1)-th users having a higher priority than the N-th user, and a second set of users comprising the (N+1)-th to the M-th users having a lower priority than the N-th user. The method moreover comprises defining, for each N-th user, a maximum value (Formula (I)) for the absolute value of the power absorbed by that user as a function of the available power B avl , a power absorbed (Formula (II)) by each of the users of the second set, a power reserve (Formula (III)) of each of the users of the second set, a power absorbed (Formula (IV)) by the users of the first set, a power reserve for the N-th user (Formula (V)), and a minimum threshold value. Subsequently, the available power B avl suppliable by the source (S) is allocated while imposing that, for each N-th user, the absolute value of the power absorbed (Formula (VI)) by the N-th user must be less than or equal to the maximum value (Formula (VII)) defined for that user (Formula (VIII)).

The present invention discloses a high-precision four-quadrant source-carrying device, including a power amplifier pair consisting of an NPN bipolar transistor and a PNP bipolar transistor, and the two bipolar transistors use the same control baseline. The control baseline is connected with a three-stage amplifier circuit, using an NPN transistor 2SC1845 and a PNP transistor 2SA992 as the first-stage power amplifier circuit, using an NPN transistor 2SC4027 and a PNP transistor 2SA1552 as the second and third-stage power amplifier circuits, and using two 1n4148 diodes as modulation diodes of the main control signal. Bidirectional voltage and current output is achieved, and a four-quadrant working mode in which output power and absorption power are combined is achieved; a diode control modulation scheme is used to control the power control tube, and continuous zero-crossing output is achieved; a soft switch control scheme is adopted to achieve reliability and safety of the device.

The invention belongs to the technical field of electromagnetic wave-absorbing materials, and particularly relates to a zero-power absorption type adjustable metasurface composite material and a preparation method thereof. Comprising a panel, a square-ring-shaped metal layer, a cross-shaped metal layer, an electric control metamaterial, a resistive film and a reflecting back plate from top to bottom in sequence, a core layer is arranged among the square metal layer, the cross curve metal layer, the electric control metamaterial, the resistive film and the reflecting back plate; the electric control metamaterial comprises second structure units which are periodically arranged along x and y directions and contain PIN diodes, and the PIN diodes are embedded into the structure; the cross curve metal layer and the square metal layer respectively comprise a third structure unit and a fourth structure unit which are periodically arranged along the x direction and the y direction. Through a cascade structure formed by the electric control metamaterial, the cross-shaped metal layer and the square ring-shaped metal layer, when the PIN diode is switched off, the wave absorbing state is presented, when the PIN diode is switched on, the reflecting state is presented, and electromagnetic waves are absorbed under the condition that bias voltage is not applied.

The invention discloses a wave energy extraction power maximization control method based on improved model prediction control. The method comprises a wave module, a Kalman filter module, a model prediction control module based on an APO algorithm and a WEC module. An adaptive noise covariance estimation method is introduced into the Kalman filter, and covariance matrixes of process noise and measurement noise are dynamically adjusted to output more accurate wave excitation force. Model prediction is utilized to control MPC online optimization so that the MPC can adapt to changes of system dynamic characteristics, meanwhile, an MPC module calculates optimal sampling time, a prediction time domain and a control time domain at the current moment through an APO algorithm, better control input is generated to be used for adjusting the running state of a wave energy converter WEC, movement of the WEC is matched with waves, and power absorption is maximized. The method has the advantages that the absorption power of the wave energy converter of irregular waves is controlled and maximized by improving the model prediction module, so that the power can be maximized.

The invention relates to the technical field of polysaccharide extraction, and discloses a method for extracting high-purity pectin through cooperation of pulse microwave and low temperature, which comprises the following steps: applying a microsecond-level microwave pulse sequence corresponding to inherent acoustic resonant frequency of raw material particles, and monitoring net absorption power and acoustic signals on line, so as to adaptively control frequency locking and pulse form in a closed-loop manner; according to the invention, the electromagnetic energy of microwaves is converted into instantaneous mechanical work, and efficient structural damage to the plant cell walls from inside to outside is realized through a resonant coupling effect on the premise of maintaining the low temperature of the system; the online self-adaptive closed-loop control mechanism ensures the whole-process optimization of the energy coupling efficiency and the process stability, so that the inherent contradiction that the product quality and the extraction efficiency are difficult to consider at the same time in the traditional extraction technology is solved.

The invention relates to an intelligent motor overload and overvoltage absorption circuit with protection and a control method thereof, and the circuit comprises a control module, a preset protection voltage adjustment module, a voltage sampling module, a voltage comparison module, an overtime and overvoltage judgment module, and a power absorption module. A comparison signal output end of the voltage comparison module is connected with a comparison signal input end of the overtime overvoltage judgment module, a judgment signal output end of the overtime overvoltage judgment module is connected with a controlled end of the power absorption module, and a sampling signal output end of the overtime overvoltage judgment module is connected with a sampling signal input end of the control module. The overtime control signal output end of the control module is connected with the overtime control signal input end of the overtime overvoltage judgment module, and the overtime overvoltage judgment module not only can monitor the occurrence of an overload overvoltage signal, but also can judge the duration of the signal, thereby avoiding the long-time conduction of a resistor, and improving the reliability of the circuit. The problem of overheating or burnout caused by continuous conduction of a resistor in traditional hardware protection is solved.

This invention provides a precise power matching fault ride-through control method based on submodule energy control, belonging to the field of wind power grid connection technology. The technical solution includes the following steps: S1: Onshore converters first enter a passive energy absorption stage; S2: The offshore converter station enters an active energy absorption state by transmitting a signal via DC voltage, and the power absorption command value is given according to the surplus power information transmitted by the DC voltage; S3: When the energy of the submodules of the offshore converter station reaches its maximum value, the flexible DC system enters precise power matching control, extending the non-disconnection time of the wind turbine after a fault. The beneficial effects of this invention are: By fully exploring the potential for functional energy recovery of the internal energy storage devices of the MMC, this invention provides a reliable solution for buying time for energy-consuming equipment to be put into operation or for wind farm load reduction, and for resolving the surplus power of the MMC-HVDC.

The invention discloses a transient field through-casing resistivity logging system transmitting circuit: comprising a DSP core board, a magnetic coupling isolation circuit, an intelligent power module, a transmitting antenna, a power absorption circuit and a transmitting current acquisition circuit, a DC / DC power supply circuit supplies power to the transmitting circuit, and the intelligent power module comprises a driving circuit, a power amplifier circuit, a protection circuit and a monitoring circuit; the DSP core board generates two PWM square wave signals, which pass through the magnetic coupling isolation circuit and then through the driving circuit to realize the switch control of the MOSFET power amplifier tube of the power amplifier circuit, and the power amplifier circuit is converted into an AC excitation for the transmitting antenna according to the control logic of the driving circuit. The transient field through-casing transmitting circuit abandons the traditional complex transmitting circuit form and adopts an integrated intelligent power module as a bridge power conversion circuit, which integrates the transmitting driving circuit, the power amplifier circuit, the overcurrent, overvoltage, undervoltage and overheating protection circuits, and is simple and easy to control.

A test method of gasoline engine generator set on engine test bench belongs to the technical field of engine test. The general engine test bench is reversibly and modularly transformed. The original power absorption device, the control and measurement industrial computer, the thermal / NVH collection system and the INCA computer are retained. The rectification, power measurement, adjustable electric load and oil consumption instrument device are newly added. The control system is reconstructed in double modes. The generator set test mode is added and the control function of the power absorption device is shielded. The speed / torque closed-loop control logic taking the adjustable electric load as the regulated variable is established. Relying on the synchronous collection of the unified clock, the microsecond time stamp alignment collection of the oil consumption, thermal, power, NVH and AC / DC electric performance of the generator set is realized. The test is carried out by reusing the extreme environment simulation system of the test bench. The transformation is reversible and non-damaging, does not affect the original function, can greatly reduce the equipment investment, improve the utilization rate of the test bench and provide support for the performance optimization of the generator set.

The composition includes a thermoplastic resin comprising a polypropylene polymer and about 0.15% to about 4.75% by weight of a filler comprising carbon nanotubes. The carbon nanotubes have an average diameter of about 5 to 15 nanometers (nm) and a density of at least about 100 square meters per gram (m 2 / gr) surface area, and 10 -3 The composition has a volume resistivity of 0.01E+1.0 Ohm.cm or less. The composition exhibits a volume electrical resistivity of 2.0E+14 Ohm.cm to 1.0E+03 Ohm.cm, and molded samples of the composition exhibit a percent power absorption of at least 65% measured in transmission mode at frequencies of about 75 GHz to about 110 GHz. Molded articles containing micron-sized features that provide the article with high absorption and low reflection properties are also described.

The invention discloses a full-direct-current offshore wind power system zero-voltage ride-through method, equipment and a medium, and relates to the field of full-direct-current offshore wind power. The objective of the invention is to solve the problem that a receiving-end converter station cannot transmit power when a land AC power grid breaks down. When the high-voltage direct-current voltage of the offshore direct-current transformer exceeds the first preset threshold value, the medium-voltage direct-current voltage control of the offshore direct-current transformer is switched to the high-voltage direct-current voltage control, so that the offshore direct-current transformer absorbs power from a high-voltage direct-current link; when the medium-voltage direct-current voltage of the fan direct-current transformer exceeds a second preset threshold value, the fan direct-current transformer is switched from low-voltage direct-current voltage control to medium-voltage direct-current voltage control, so that the fan direct-current transformer can absorb power from the low-voltage direct-current voltage side through a fan grid-side direct-current transformer; and when the low-voltage direct-current voltage of the offshore direct-current transformer exceeds a third preset threshold value, the brake resistor is activated to dissipate surplus power until the low-voltage direct-current voltage is lower than a fourth preset threshold value.

This invention discloses a transient control method for a wind turbine grid-connected system that utilizes a reverse energy absorption branch, relating to the field of new energy technology. The energy-consuming branch is connected in parallel to the DC bus capacitor. The grid connection point voltage and DC bus voltage of the wind turbine grid-connected system are acquired. When the grid connection point voltage reaches a preset condition, a reference value for the d-axis current of the grid-side converter is calculated based on the grid connection point voltage and the voltage of the DC bus capacitor. Based on the reference value, the active power state of the grid-side converter is switched to an active power absorption state, allowing the DC bus capacitor to store electrical energy and raise the voltage. When the voltage of the DC bus capacitor is greater than the threshold voltage of the transistor, the transistor is controlled to be in the conducting state. Through this technical solution, the direction of energy flow on the DC bus between the turbine-side converter and the grid-side converter can be changed. Furthermore, by consuming excess energy through resistance, wind turbine output oscillations and DC-side overvoltage can be suppressed, and the synchronous stability of the wind turbine grid-connected system can be improved.

The invention discloses a light storage and charging integrated control method and system, a product and a medium. The method comprises the steps that under the condition that a composite disturbance state is detected, the increasing rate of photovoltaic power is analyzed to predict imminent power imbalance, and a basic feed-forward absorption power value is calculated; meanwhile, a feedback regulation power value is calculated according to the real-time deviation of the direct-current bus voltage. And adding the feedforward value and the feedback value to obtain a total absorption power instruction. The total power is used for controlling the super capacitor bank bidirectional converter to perform power absorption to cope with voltage fluctuation. And when the bus voltage falls below the safety threshold and is kept stable for a period of time, the conventional control mode is recovered. By implementing the technical scheme provided by the invention, the stability of the direct-current bus voltage under specific composite disturbance is enhanced.

The invention discloses a direct-current converter for oscillation suppression and surplus power absorption and a control method thereof, and relates to the technical field of direct-current power transmission and distribution, a function module unit is formed through the parallel design of an oscillation suppression subunit and a power absorption subunit, and then a function module is formed through cascading the function module unit. And the function module and the starting module are connected in series to form the direct-current converter for oscillation suppression and surplus power absorption. By adopting the embodiment of the invention, accurate suppression of direct current voltage oscillation and efficient absorption of surplus power can be integrated, and safe, stable and reliable operation of a direct current power transmission and distribution system is ensured while hardware cost and space occupation are reduced.

The invention provides a flexible distribution network fault rapid isolation control system and method. In the system, the flexible distribution network fault rapid isolation control system can control the dual-active bridge converter and the rapid switch to be switched off when a DC side fault occurs, so that the energy consumption device and the power absorption circuit rapidly limit a fault current and avoid fault diffusion, thereby reducing the power failure time and range, improving the power supply reliability of the distribution network system, and improving the power supply reliability of the distribution network system. Meanwhile, through an energy consumption device and a power absorption circuit, excessive active power is absorbed, the frequency of a power distribution network system is kept stable, the problem that the power of the dual-active bridge type converter is excessive after a fault is solved, and safe and stable operation of the power distribution network system is ensured; faults of the power distribution network system are isolated through the energy consumption device and the power absorption circuit, and the construction cost of the power distribution network system is reduced.

The invention discloses a frequency cooperative control system, method and device for a flexible interconnection low-voltage power distribution network and a medium, and belongs to the technical field of flexible interconnection power distribution networks, and the method comprises the steps: building an equivalent circuit model of the DC side of a multi-end feed-in flexible hub switch, calculating the impedance analytical expression of each converter and DC capacitor, and calculating the impedance analytical expression of each converter and DC capacitor; obtaining a quantitative index for measuring the stability margin of the direct current side of the system; if not more than 0, positioning a direct current side unstable link and optimizing control parameters of the direct current side unstable link; if gt; and if yes, completing the parameter design, and applying the control parameter to the frequency cooperative control of the flexible interconnection low-voltage power distribution network. According to the method, the internal interaction stability of the device is evaluated by constructing quantitative indexes, weak links of the stability can be positioned, control parameters are optimized in a targeted manner, and the overall operation stability is effectively improved; meanwhile, when frequency deviation occurs in the power distribution network on one side, power absorption or release of the internal energy storage device can be regulated and controlled on the premise that normal operation of the power distribution network on the other side is not interfered.

The invention provides a dust collector power control method, a dust collector and a computer readable medium, and belongs to the field of cleaning equipment. The control method comprises the following steps: enabling the dust collector to operate at first power P1; operation parameters used for representing the actual suction capacity of the dust collector are obtained, wherein the operation parameters comprise at least one of the vacuum degree at a suction opening of the dust collector, the air inlet amount and the motor rotating speed; judging whether the dust collector is in a high-suction working state or not at present according to the operation parameters in combination with preset judgment logic; if yes, the operation power of the dust collector is increased to target power higher than the first power P1; if not, the dust collector operates at the first power P1 or the operation power of the dust collector is reduced. The output power of the motor is dynamically adjusted according to a judgment result by judging whether the dust collector is in a large-power-absorption working state or not; through combination of power absorption state recognition and power self-adaptive control, balance between dust absorption efficiency and energy consumption is achieved, and the dust absorption effect and endurance can be both considered.

This invention relates to the field of pumped storage technology, and discloses a method, device, medium, and product for joint regulation and control of pumped storage units. The method includes: acquiring the rated power value, variable speed operation power adjustment range, and hydraulic short-circuit operation power adjustment range of the pumped storage unit to be controlled; upon receiving the power absorption value from the power grid dispatch system, determining a first ratio between the power grid dispatch absorption power and the rated power value; acquiring the maximum variable speed operation power value based on the variable speed operation power adjustment range, and determining a second ratio between the maximum variable speed operation power and the rated power; and determining the target operating mode of the pumped storage unit to be controlled based on the first ratio, the second ratio, the variable speed operation power adjustment range, and the hydraulic short-circuit operation power adjustment range, and controlling the operation of the pumped storage unit. Therefore, by implementing this invention, considering the hydraulic short-circuit operation mode, continuous regulation of absorbed power across the entire power range is achieved.

The invention discloses an energy storage method, system, equipment and medium for quick start and wide load operation, and relates to the technical field of energy storage, and the method comprises the steps: controlling a first energy storage unit to be connected with a grid preferentially to realize quick response, and starting a compressed air energy storage unit at the same time. After load switching, when the system needs to operate below the safety boundary, the first energy storage unit absorbs power, and the low-load operation capacity of the system is cooperatively expanded. According to the invention, second-level quick start of the energy storage system is realized, and the emergency response requirement of a power grid is met. According to the method, by presetting the safe operation boundary and adopting the cooperative control strategy, the technical problems that the minimum output limitation of a traditional compressed air energy storage system is strict, and the low-load peak regulation capacity is insufficient are solved, and the load regulation range of the system is greatly widened. Therefore, the energy storage system not only can provide rapid frequency support, but also can carry out safe deep peak regulation, and the support capability and the operation flexibility of a power grid are remarkably improved.

A new circuit element is introduced which is a regulated power source (RPS) capable of delivering a controlled power into an uncontrolled load. In a first embodiment, a switching power supply controls power delivery rate by setting a peak inductor current or by controlling switching frequency. In a second embodiment, an analog multiplier circuit is placed into a feedback loop of an operational amplifier so power is delivered or absorbed responsive to a power control signal. Applications that exist for a first RPS embodiment include maintaining a solar panel at its MPP (maximum power point), combining the DC outputs of solar panels receiving unequal illumination, transfer of power to batteries or inverters and energy transfer using timed power delivery. Applications for a second embodiment also include temperature control and high bandwidth AC and DC precision power sourcing and sinking.

The invention relates to a load modulation balance power amplifier circuit, which belongs to the technical field of wireless communication, and comprises a first bridge and a circulator, one end of a phase impedance adjusting line is connected with a first bridge straight-through port, and the other end of the phase impedance adjusting line is connected with a third port of the circulator; one end of the impedance adjusting line is connected with the first bridge coupling port, and the other end is connected with the circulator first port; one end of the phase adjusting line is electrically connected with the circulator second port, and the other end serves as a circuit output end; the input end of the power divider serves as a circuit input end; the input end of the main power amplifier is electrically connected with the first output port of the power divider; the input end of the auxiliary power amplifier is electrically connected with the second output port of the power divider; one end of the impedance conversion line is electrically connected with the main power amplifier output end, and the other end is electrically connected with the first bridge isolation port; the output end of the auxiliary power amplifier is electrically connected with the input port of the first bridge. A power absorption load does not need to be arranged, the circuit area and cost are saved, higher power back-off efficiency is achieved, and the transistor can be protected.

The invention discloses an electrically-driven power wheel system based on multi-stage vibration reduction design, and relates to the technical field of new energy carrying systems. The electric vehicle wheel driving device is applied to the field of electric vehicle wheel driving and comprises a hub installed on a wheel, the center position of the hub is rotationally connected with a supporting shaft, a motor shell is fixedly installed on the outer surface of the supporting shaft, and a stator and a planetary gear speed reduction assembly are installed in the motor shell; and a first vibration reduction structure is mounted between the planetary gear speed reduction assembly and the hub. Additional masses of a hub motor and a steering servo motor are decoupled from unsprung masses through rubber elements and in-wheel shock absorbers, and the newly added unsprung masses are converted into dynamic shock absorption advantages by reconstructing a parallel-series composite vibration topology. The problem of vertical dynamic characteristic deterioration caused by unsprung mass increase due to introduction of a driving motor and a steering motor is effectively solved, the wheel grounding performance is improved, and the service life of parts is prolonged.

The invention provides a symmetrical half-bridge-based power decoupling topology and a control method thereof.The symmetrical half-bridge-based power decoupling topology comprises a bus capacitor, a power absorption unit, a decoupling unit, a sampling unit and a control unit; the output end of the bus capacitor is connected with the input end of the power absorption unit, and the output end of the power absorption unit is connected with the decoupling unit; the input end of the sampling unit is connected with the bus capacitor, the feedback end of the sampling unit is connected with the input end of the control unit, and the output end of the control unit is connected with the input end of the power absorption unit. The power decoupling circuit used in the invention can be ensured to be stable under various working conditions, the double frequency ripple absorption of the bus can be realized, and the design and the control method of the invention show better stability.

The present application relates to a method for refining the size of potassium bubbles in W-K alloy rods by electron beam heat loading, comprising the following steps: (1) cutting the W-K alloy rods into samples with a thickness of not more than 1 mm, and polishing the samples to make the sample surface smooth and bright; (2) placing the samples obtained by step (1) in an electron beam device for cyclic electron beam heat loading treatment, wherein the absorption power density of the electron beam heat loading is 10-20 MW / m 2 and the scanning frequencies of the electron beam in the x direction and the y direction are 35 kHz and 26 kHz respectively. The present application refines the tubular potassium bubbles in the W-K alloy to a nanoscale row distribution by applying an electron beam heat load with a suitable power density. The purpose of refining the potassium bubbles is achieved without changing the microstructure of the tungsten matrix, and the overall mechanical properties of the material are improved.

The invention discloses a cooperative control method for voltage, which is used for a wind power plant direct current system, and comprises the following steps: when the wind power plant direct current system has a direct current commutation failure fault, determining whether the direct current commutation failure fault is in an overvoltage state or not according to the voltage of a commutation bus; if the wind power plant direct-current system is in the overvoltage state, reactive power needing to be absorbed by the wind power plant direct-current system is calculated according to the deviation between the commutation bus voltage and the reference voltage; calculating the maximum reactive power absorption power of each wind turbine generator in the direct current system of the wind power plant, distributing reactive power needing to be absorbed to each wind turbine generator according to the proportion of the reactive power capacity of the wind turbine generator to the total reactive power capacity of the wind power plant, and obtaining reactive power absorption reference power of each wind turbine generator; when the reactive power absorption reference power of any wind turbine generator reaches the maximum reactive power absorption power, residual reactive power in the reactive power needing to be absorbed is determined; and starting the static var generator SVG, and outputting residual reactive power through the static var generator SVG.