98 results about "Power absorption" patented technology

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 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 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.

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.

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 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 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 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.

The application provides a grid-connected device control method and system, a grid-connected device and a medium. The method comprises the following steps: acquiring a first grid-connected point voltage; when the first grid-connected point voltage enters a preset low penetration buffer interval or a preset high penetration buffer interval, adjusting the active power or the reactive power of the grid-connected device according to the priority mode configuration and the device attribute parameters of the grid-connected device to obtain a second grid-connected point voltage. When the second grid-connected point voltage enters a low penetration interval or a high penetration interval, the priority mode configuration is adjusted to a reactive power priority mode, and reactive power absorption is performed to obtain a third grid-connected point voltage. When the third grid-connected point voltage is greater than a preset low penetration threshold or less than a preset high penetration threshold, the priority mode configuration is adjusted to an active power priority mode. In this way, the problem of power oscillation caused by frequent fluctuations of the grid-connected point voltage at the high and low penetration thresholds is avoided, and the safety of the power grid and the grid-connected device is effectively ensured.

The application discloses a power grid residual power distributed absorption regulation method based on a private charging pile group, relates to the technical field of private charging piles, and generates an absorption input set Dat through a cloud regulation platform; performs heterogeneous identification and target screening on the private charging pile group to generate a heterogeneous candidate set Can; when a residual power absorption triggering condition is met, the absorption input set Dat and the heterogeneous candidate set Can are input into a pre-trained deep reinforcement learning model to generate a path absorption strategy Map, and a control group is formed and a control group cooperative execution sequence is formed; an edge computing node issues specific execution instructions according to the control group cooperative execution sequence, and the cloud regulation platform performs rolling correction, supplementary control and result reporting. The demand side response scheduling instruction can be directly converted into an equipment side executable strategy, and the response speed, residual power absorption efficiency and regulation precision of the heterogeneous private charging pile group are improved.

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

To perform power supply and absorption with a system for power system stabilization, efficiently and at low costs.SOLUTION: An arrangement (1) connectable to an alternating current power transmission system (2) comprises a static synchronous compensator device (3) having a converter unit (4) and an energy storage unit (5) connected with the converter unit; a power absorption device (6); and a control device (9) connected with the static synchronous compensator device and with the power absorption device. The control device controls the static synchronous compensator device to exchange power with the alternating current power transmission system, controls the power absorption device in dependence of a charge state of the energy storage unit and a state of the power transmission system, further determines whether or not there is a need to absorb active power from the AC power transmission system in excess of what the static synchronous compensator device is currently absorbing and, in the case of such a need, controls the power absorption device to absorb active power.SELECTED DRAWING: Figure 1

The application discloses a power adjusting method and device and electronic equipment, the method determines the rotating speed interval of the engine rotating speed; in the case of determining that the engine rotating speed is in the first rotating speed interval, the first supercharging pressure and the first preset pressure are used to adjust the absorption power of the hydraulic pump; in the case of determining that the engine rotating speed is in the second rotating speed interval, the second supercharging pressure, the second preset pressure, the first injection amount and the first preset injection amount are used to adjust the absorption power of the hydraulic pump; in the case of determining that the engine rotating speed is in the third rotating speed interval, the third supercharging pressure, the third preset pressure, the second injection amount and the second preset injection amount are used to adjust the absorption power of the hydraulic pump. That is to say, the application sets the preset pressure or the preset pressure and the preset injection amount for each rotating speed interval by determining that the engine rotating speed is in different rotating speed intervals, so as to adjust the absorption power of the hydraulic pump, and accurate adjustment of the absorption power of the hydraulic pump under different rotating speed conditions is realized.

The invention relates to a multi-machine parallel seamless switching diesel generating set system which comprises a common bus, a direct current bus, a bidirectional DC-AC converter, a power generation unit group and a main controller. The power generation unit at least comprises two diesel generators connected in parallel and a super capacitor energy storage unit, the diesel generators are connected with the direct current bus through a bidirectional AC-DC converter, and a super capacitor is directly connected to the direct current bus in parallel. The system is coordinated and controlled by the main controller, and the power is instantaneously compensated or absorbed when the load is suddenly changed by utilizing the quick response characteristic of the super capacitor energy storage unit, so that the stability of a direct-current bus is maintained; instantaneous power buffering is provided when a unit is started, stopped, connected to a grid or breaks down, and smooth power transition is achieved. Seamless power switching and parallel operation among a plurality of diesel generating sets are realized, the dynamic stability of the system is effectively improved, the power supply quality is effectively improved, and the service life of equipment is effectively prolonged.

The application discloses an ion source tilting extraction device and relates to the technical field of semiconductor processing equipment; the device comprises a microwave main path, a plasma chamber, a gas supply assembly, an ion beam extraction control assembly and a power supply assembly; the microwave main path comprises a microwave source, a waveguide and a residual power absorption load, the microwave source, the waveguide and the residual power absorption load are sequentially communicated, the waveguide is connected with the plasma chamber, a plurality of slot holes are formed on the waveguide and are spaced apart from each other and face the plasma chamber, and an ion beam extraction outlet is formed on the plasma chamber; the gas supply assembly is connected with the plasma chamber and is used for introducing working gas into the plasma chamber; the ion beam extraction control assembly is arranged at the ion beam extraction outlet of the plasma chamber, and the power supply assembly is electrically connected with the ion beam extraction control assembly. The application can realize uniform tilting extraction of an ion beam and can greatly improve the flexibility of process treatment.

The invention discloses a repeated low-pass suppression method and device suitable for a new energy station flexible DC island sending-out system, electronic equipment and a storage medium thereof, and relates to the technical field of power system relay protection. According to the method, a flexible direct current island sending-out system of a following and constructing hybrid new energy field station is established, a following network type unit adopts a control strategy of power grid voltage orientation, and constructing network type energy storage adopts a vector control strategy based on internal potential orientation; a mechanism that the new energy unit repeatedly enters the low voltage ride through under the influence of the low voltage ride through characteristic and the PV curve characteristic is researched under the strong wind working condition, and a repeated low voltage ride through restraining method is analyzed; researching a grid-connected point voltage repeated fluctuation mechanism and a control strategy and an operation state of network construction type energy storage, and constructing a criterion for converting energy storage into a charging state under a strong wind working condition; and a criterion combining the critical voltage threshold value and the active power absorption amount is further provided.

The invention discloses an energy storage photovoltaic consumption control method, device and equipment and a storage medium, and relates to the technical field of power control. Comprising the steps that the current unit power at the current moment, the photovoltaic prediction power at the next moment and the environment temperature of a target heat supply environment of a heat pump host in the thermal control system are obtained, and whether the preset environment thermal comfort condition is met or not based on the environment temperature is judged; if the environment temperature meets the preset environment heat comfort condition, the current heat pump power level of the heat pump host is determined based on the current unit power, and the photovoltaic prediction power is compared with the interval power of the current heat pump power level to determine the frequency adjustment target of the heat pump host; and the operation mode of an energy storage water tank in the thermal control system is obtained, the photovoltaic power consumption state of the energy storage water tank is adjusted according to the operation mode and the frequency adjustment target, and the current unit power of the heat pump host is controlled and adjusted based on the preset storage battery. Therefore, the distributed photovoltaic power can be effectively consumed on the premise of indoor thermal comfort.

The utility model relates to the technical field of power electronics, in particular to a voltage spike absorption circuit and a fire-fighting power supply, which are reasonable in structure, safe and reliable, and capable of improving the quality and operation stability of a power supply product, and is characterized by being provided with a power absorption resistor, a damping resistor, an absorption capacitor and a clamping diode, compared with the prior art, the power supply has the remarkable advantages that the structure is reasonable, the safety and the reliability are realized, the quality and the operation stability of a power supply product can be improved, and the like.

The utility model discloses an energy-absorbing resistor module which comprises two insulating bases arranged in parallel and two groups of resistor strings, and each group of resistor strings is provided with an insulating penetrating rod fixedly arranged between the two insulating bases and a plurality of carbon-based composite resistors sequentially sleeved on the insulating penetrating rod along the length direction of the insulating penetrating rod. Every two adjacent carbon-based composite resistors are bonded and fixedly connected through a heat-conducting and electric-conducting adhesive and are electrically conducted; in addition, a leading-out terminal is connected in parallel between any two carbon-based composite resistors which belong to different resistor strings and are located on the same outermost side. The energy-absorbing resistor module has the advantages of low resistance, very small inductance, high power absorbing capacity, high continuous average power capacity and the like, and well meets the use requirements of various application scenes such as a pulse power supply, power transmission, electric traction, induction heating and the like.

The invention discloses a three-machine type pumped storage unit adjusting method and system, and the method comprises the steps: determining different working conditions of a three-machine type pumped storage unit based on a reference power value, and determining different working condition distribution coefficients based on the different working conditions; determining a water turbine working condition distribution coefficient based on the water turbine working condition, determining a hydraulic short-circuit working condition distribution coefficient based on the hydraulic short-circuit working condition, determining a water pump working condition distribution coefficient based on the water pump working condition, and determining different water turbine guide vane opening values and water pump guide vane opening values based on the distribution coefficients of different working conditions; or determining the guide vane opening values of the water turbine and the water pump based on the deviation between the actual frequency and the standard frequency of the system; the synchronous motor output power of the three-machine type pumped storage unit is adjusted based on the water pump guide vane opening value and the water turbine guide vane opening value, the output or absorption power value of the unit is automatically adjusted with the reference power value or the frequency deviation as input, the load requirement of a power grid is met, and the stable power grid frequency is kept.