38 results about "Load rejection" patented technology

The invention provides an overvoltage transient suppression method and system for an automobile generator rectifier and a medium, and relates to the technical field of rectifiers, and the method comprises the steps: carrying out the dynamic continuous data collection of an automobile generator through a transient data collection device, and obtaining an output voltage waveform; a load rejection identification mechanism is introduced to identify and analyze the output voltage waveform, and a real-time load rejection event is obtained; triggering an active protection circuit based on the real-time load throwing event, and generating a real-time protection control decision; and performing transient suppression on the rectifier according to the real-time protection control decision. The technical problems that in the prior art, overvoltage protection of an automobile generator rectifier is slow in response speed and low in protection precision, and the overvoltage transient state cannot be effectively restrained are solved. The technical effects of accurately identifying and responding to the overvoltage event and improving the timeliness and effectiveness of overvoltage transient suppression of the automobile generator rectifier are achieved.

The invention belongs to the technical field of thermal generator set automatic control, and particularly discloses a BEST double-machine regenerative thermal power plant converter load shedding automatic control method which comprises the steps that the shaft power of a steam feed pump and the shaft power of a small generator are determined; according to the sum, the pre-action opening degree of a BEST feed pump turbine steam inlet adjusting valve after the converter is subjected to load shedding is determined; predicting the rising rotating speed of the BEST steam feed pump set according to the rotating speed of the BEST steam feed pump set; and a steam feed pump minimum flow recirculation valve control method and a BEST feed pump turbine backpressure control method are started, and a rotating speed control method of the BEST feed pump turbine is determined according to the control method. According to the method, the rotating speed fluctuation process of the BEST steam feed pump set is shortened, the fluctuation amplitude of the boiler inlet feed water flow is reduced, and the stability and safety of the whole set after load shedding of the converter are guaranteed.

The invention discloses an optimal control method for load shedding water hammer pressure of a pumped storage power station containing a fixed-variable speed unit. The method comprises the following steps: firstly, based on a pump turbine full-characteristic curve, performing variable-speed unit efficiency optimization, and determining the highest efficiency of a variable-speed unit and the corresponding optimal rotating speed; then, establishing a transition process mathematical model of the water delivery and power generation system of the pumped storage power station containing the constant-variable speed unit, and calculating Pareto leading edges taking the maximum pressure of a volute and the minimum pressure of a draft tube as optimization targets under different control schemes by adopting different guide vane closing rules for the constant speed unit and the variable speed unit; and finally, carrying out normalization processing on the maximum pressure of the volute and the minimum pressure of the draft tube, establishing a transient characteristic multi-target evaluation function, and screening out an optimal control scheme from the Pareto frontier. By means of the method, the water hammer pressure extreme value caused by hydraulic interference between the constant-speed unit and the variable-speed unit can be effectively improved, the operation stability and safety of a power station are improved, and good engineering adaptability is achieved.

The invention discloses an impulse turbine capable of generating power bidirectionally, and relates to the technical field of water turbine.The impulse turbine comprises a water turbine main shaft, a rotating wheel disc and an annular water conveying pipe, the water turbine main shaft is fixedly inserted into the rotating wheel disc, and a plurality of connecting rods are arranged on the outer wall of the rotating wheel disc along the circumference; one end of the connecting rod is inserted into the rotating wheel disc and is fixedly provided with a gear, and the other end of the connecting rod is fixedly provided with a steerable water bucket. When the water turbine needs to be braked or steered, the steering system can be put into use, other equipment does not need to be disassembled or added, and therefore the device is more convenient to use; when the water turbine is shut down or load shedding occurs due to accidents, the steerable water bucket and the steerable nozzle are controlled by hydraulic control equipment to conduct steering operation, and meanwhile, a water inlet valve on the water spraying pipe is opened, so that water flow reversely impacts the steerable water bucket through the steerable nozzle, and then braking torque opposite to the original rotating direction is provided; therefore, rapid braking of the impulse turbine is achieved.

The invention provides a load rejection device and passive floating equipment, and belongs to the technical field of underwater equipment. The load rejection device comprises a platform body, an extending frame, a first lever, a metal pull rod, a positive electrode power connection end and a negative electrode power connection end. The extension frame is arranged on the lower side of the platform body; the first lever is installed on the platform body and comprises a first bearing end and a pull rod connecting end. The first end of the metal pull rod is connected with the pull rod connecting end; the anode power connection end is directly and conductively connected with the metal pull rod, and the cathode power connection end is insulated and isolated from the metal pull rod. When load rejection counterweight is needed, the positive electrode power connection end is connected with a power supply positive electrode, the negative electrode power connection end is connected with a power supply negative electrode, and the metal pull rod serves as a sacrificial anode in a water environment to be electrochemically corroded and gradually dissolved and thinned. When the metal pull rod is corroded and cannot bear the pulling force of the first lever, the metal pull rod is broken. The first bearing end of the first lever rotates relative to the platform body under the gravity action of the balance weight, and load rejection and release of the balance weight are achieved.

The invention discloses a load rejection type buoyancy-adjusted underwater reciprocating observation platform, which belongs to the technical field of underwater survey, and comprises a shell, which is provided with a floating block cabin positioned at the upper part and a heavy block cabin positioned at the lower part; a plurality of floating blocks capable of throwing loads are arranged in the floating block cabin; a plurality of heavy blocks capable of throwing loads are arranged in the heavy block cabin; the load rejection device is provided with a driving device, a linkage structure capable of moving up and down under the driving of the driving device, a floating block load rejection structure for rejecting a floating block and a heavy block load rejection structure for rejecting a heavy block; and the linkage structure is connected between the floating block load rejection structure and the heavy block load rejection structure and drives the floating block load rejection structure and the heavy block load rejection structure to act, so that the heavy block and the floating block are alternately thrown out. Floating and sinking of the equipment are achieved through load rejection of the floating block and the heavy block, the oil consumption bottleneck is broken through, and light weight and long endurance are achieved. And the floating block and the heavy block are directly separated from the equipment after load rejection, extra load cannot be caused, and the size and the weight of the equipment can be accurately controlled.

The embodiment of the invention provides a gas turbine self-adaptive PID control method for a load shedding working condition, and relates to the technical field of gas turbine control, and the method comprises the following steps: determining a gain optimization variable based on a gas turbine model, constructing an optimization objective function, and determining an input parameter; iterating the gain optimization variable through an intelligent optimization algorithm, constructing an initialized litsea rotundifolia of the intelligent optimization algorithm through a chaotic mapping method based on the search space, the litsea rotundifolia scale and the optimization dimension, calculating an optimal solution of the gain optimization variable based on the initialized litsea rotundifolia, and if the number of iterations reaches the maximum number of iterations, ending the iteration and outputting the optimal solution. If the maximum number of iterations is not reached, continuing iteration until the maximum number of iterations is reached; and taking the optimal solution of the gain optimization variable as a parameter of a cascade PID controller, and controlling the gas turbine in the load shedding working condition. According to the scheme, under the load shedding working condition, the gas turbine can rapidly adjust parameters, and stable output is kept.

The invention relates to a novel method for carrying out a continuous load rejection test in cooperation with a linear motor, belongs to the technical field of load rejection devices, and solves the problems that a load rejection device in the prior art is low in filling speed and inconvenient to use. The method comprises the following steps: step 1, mounting a plurality of load memories on a mounting mechanism; 2, according to the load casting requirement, the load casting angle is adjusted, and the step 3 or the step 4 is executed; step 3, connecting an alternate casting controller with a connector, and starting a catapult to continuously cast a single load; and 4, disconnecting the alternate casting controller from the connector, and starting the catapult to continuously cast a plurality of loads at the same time. The multiple loads are mounted at a time through the load storage device, the multiple loads are sequentially and automatically loaded into the casting device through the load storage device, rapid load loading is achieved, the structure is simple, and use is convenient.

The invention relates to the technical field of nuclear power control, in particular to a response method for tripping of a single main feed pump under the full-power working condition of a nuclear power unit. The method comprises the steps that during power operation, operation parameters and states of subsystems and equipment of a power plant are continuously monitored, and when it is monitored that a reactor operates at high power and a single main water feeding pump of a main water feeding system trips, a steam turbine load shedding signal is triggered, and meanwhile a rod falling signal is generated; hard wiring is added between the control rod cabinet and the rod controller, and after a rod falling signal is received, pin claw coils of the corresponding pre-selected control rod group are all de-energized, so that the pre-selected control rod group quickly falls into the reactor bottom under the action of gravity, and the reactor power is reduced to PL. According to the method, the power of the steam turbine is rapidly reduced, and the predetermined control rod group is rapidly inserted into the reactor core, so that the nuclear power is rapidly reduced, the power balance of the first loop and the second loop is maintained, the SG liquid level is not too low, and shutdown is avoided.

The present application relates to the technical field of water conservancy and hydropower engineering, and particularly relates to a control method for accelerating surge attenuation of a surge chamber of a pumped storage power station. Two units are first unloaded, and at a first opening time T1, one unit is opened from no-load opening to guide vane pause relative opening τ Z . Most of the surge chamber water level fluctuation is offset by opening a large opening degree for first-stage regulation, and the remaining water level fluctuation is reserved for subsequent guide vane action to offset; subsequently, the guide vane maintains a constant relative opening τ Z , and at a second opening time T2, the guide vane is opened from τ Z to full opening. The remaining surge chamber water level fluctuation is offset by opening a small opening degree for second-stage regulation, and through stepwise differential regulation, rapid attenuation of the water level fluctuation is achieved. A solution method for the first opening time T1 and the second opening time T2, and the guide vane pause relative opening τ Z is given. The present application accelerates the attenuation of the surge of the surge chamber, reduces the grid-connection waiting time after the unit is unloaded, improves the flexibility of the unit operation, and increases the power generation benefit of the hydropower station.

The embodiment of the application provides a kind of regulating rod control method and device, electronic equipment, nuclear power plant system and medium, belong to nuclear power plant safety technical field.The method comprises: in response to the working condition information of nuclear power plant system is load rejection condition, the target power of reactor is acquired;According to target power and initial correction factor, determine the secondary loop load demand signal;According to the first initial position of power regulating rod and secondary loop load demand signal, control power regulating rod moves;According to the second initial position of temperature regulating rod, adjust initial correction factor to obtain target correction factor;According to target correction factor, target power, the measured temperature of primary loop subsystem and the measured power of reactor, control temperature regulating rod moves to intermediate position;According to intermediate position and preset safety position, desalted water is injected into primary loop subsystem until temperature regulating rod reaches safety position.The embodiment of the application quickly improves the safety of nuclear power plant under load rejection condition.

The invention discloses a pressure-resistant mobile platform device capable of realizing sea-air cross-domain. The device comprises a pressure-resistant cabin, a main body frame, a power system, a buoyancy system, a load rejection system and a control acquisition system, the main body frame is of a hollow rectangular frame structure, the pressure-resistant cabin is fixedly connected to the middle of the main body frame, the buoyancy system is installed on the periphery of the pressure-resistant cabin, the power system is fixedly connected to the top of the main body frame, and the load rejection system is located on the lower portion of the main body frame and installed on the lower surface of the pressure-resistant cabin. The control acquisition system is fixedly installed on the pressure-resistant cabin body, and the power system and the buoyancy system are both controlled by the control acquisition system. The device can run and span in various media in deep sea, shallow sea, sea surface and air, and can effectively prevent the subsidence phenomenon.

The utility model discloses a load rejection device, which comprises a support body, a load rejection device, a load rejection device, a load rejection device and a load rejection device, and is characterized in that a guide part and a clamping part are formed in the support body; the driving device is fixed on the bracket body and comprises a release element which is used for being detachably connected with the main laying component and is provided with a locking position and an unlocking position; the driving element drives the releasing element to act so as to release the main laying part and enable the releasing element to be switched between a locking position and an unlocking position; the transmission part is movably arranged in the guide part and is in contact fit with the release element; the locking part is rotatably connected to the support body, one end of the locking part is arranged in the clamping part, and the other end of the locking part is in contact fit with the transmission part. When the load rejection device is used, continuous power supply is not needed, and energy consumption is low.

The application relates to a mixed-flow pump-turbine runner and a runner S characteristic optimization method, and belongs to the technical field of hydraulic machinery.The application aims to solve the problems that the diameter of the high-pressure side of a pump-turbine runner of a high-head and large-capacity pumping and storing unit needs to be set larger, the runner inlet height needs to be lower, the S characteristic is more prominent, the frequency of starting and stopping and load shedding of pumping and storing units for intermittent energy such as wind and light is increased, and the risk of operation of the pumping and storing unit in the S area is increased, and the application comprises an upper crown, a lower ring and multiple blades; the upper crown is arranged above the lower ring, multiple blades are arranged in a passage between the upper crown and the lower ring, the multiple blades are arranged in a radial direction, and the high-pressure side of each blade is processed with a concave-convex knot airfoil type. The application further relates to a mixed-flow pump-turbine runner S characteristic optimization method, which comprises the following steps: step one, modeling through three-dimensional modeling software; and step two, forming a spatial curve by intersecting a circular pipe with blades in a blade middle surface. The application belongs to the technical field of runner design of a hydraulic turbine.

Embodiments of the present disclosure relate to an uninterruptible power supply. The uninterruptible power supply comprises a switch, a power management module, an inverter and a controller. The switch is arranged between a load and a power source, the power source configured to supply power to the load. The power management module comprises a main energy storage and configured to reduce a ripple experienced by the main energy storage. The inverter is arranged between and coupled to the power management module and the load. The controller is coupled to the power management module, the inverter and the switch, the controller configured to control the inverter to regulate output voltage magnitude and frequency by regulating the power exchange between the inverter and the power source. According to embodiments of the present disclosure, the overcharging of the energy storage during sudden load rejections or utility phase jumps can be avoided.

The invention provides a pump turbine characteristic curve comparison method based on a runaway line elevation angle, which comprises the following steps of: extracting a characteristic curve runaway line and an equal opening line near a rated operating point, and constructing the runaway line elevation angle according to an intersection point of the characteristic curve runaway line and the equal opening line, a projection of the intersection point on an abscissa axis and a coordinate origin; and a calculation formula of a runaway line elevation angle is given through an anti-trigonometric function. And when the elevation angle of the runaway line is larger, the parameters of the transition process during the load shedding operation of the unit under the corresponding curve are better. According to the method, the influence of different characteristic curves on the parameters of the transition process can be quickly compared, a large amount of numerical calculation is avoided, and convenience is provided for characteristic curve selection in an actual project.

The utility model relates to a loadable multi-probe ejection device which is suitable for ocean exploration. The existing in-situ test probe injection operation depends on large-scale equipment, and the operation time is long. The device is carried on a ship through an ejection operation module and comprises a battery module, a data storage module and a plurality of ammunition modules. The launching module, the ammunition module and the high-speed probe realize ejection and data acquisition through a specific structure and connection. During launching, the electric cylinder is driven, the clamping jaw and the spring are matched to realize high-speed probe launching, and load rejection and automatic filling can be realized after launching. The ammunition module is in an ammunition drum shape and can be pushed out and filled through a rotary spring or a motor. The device has the advantages of convenience in operation, high speed, high universality, excellent data acquisition and transmission, efficient and reliable automatic filling and the like.

The invention provides a control valve optimization control method and a control valve optimization control system for a steam turbine. The control valve optimization control method comprises the following steps: acquiring target opening degrees of control valves output by a DEH control system in a current period and actual opening degrees of the control valves in a previous period; the preset experience opening degree, the target opening degree of the current period and the actual opening degree of the last period of the same control valve are compared, and if the target opening degree of the current period of the control valve is larger than the preset experience opening degree of the control valve and the actual opening degree of the last period at the same time, the control valve is controlled to be opened to the target opening degree at the preset speed increasing rate; otherwise, the control valve is controlled to be directly opened to the target opening degree; according to the method, the problems of violent load fluctuation caused by control valve oscillation and large EH oil pressure fluctuation caused by untimely oil supply of an EH oil supply system can be reduced or avoided in a mode of reducing the control valve lifting rate during increment adjustment of a high-valve-position control valve, the reliability of instant load shedding or unit splitting can be ensured when the load is reduced, and the service life of the EH oil supply system is prolonged. And the operation safety of the unit is ensured.

The embodiment of the application provides a gas turbine adaptive PID control method for load rejection conditions, which relates to the technical field of gas turbine control and comprises the following steps: determining gain optimization variables based on a gas turbine model, constructing an optimization objective function and determining input parameters; iteratively processing the gain optimization variables through an intelligent optimization algorithm, constructing an initialization wolf group of the intelligent optimization algorithm through a chaotic mapping method based on a search space, a wolf group size and an optimization dimension, calculating an optimal solution of the gain optimization variables based on the initialization wolf group, ending the iteration and outputting the optimal solution if the number of iterations reaches a maximum number of iterations, and continuing the iteration until the maximum number of iterations is reached if the maximum number of iterations is not reached; and taking the optimal solution of the gain optimization variables as parameters of a cascade PID controller and controlling the gas turbine in the load rejection condition. The scheme enables the gas turbine to rapidly adjust parameters and maintain stable output in the load rejection condition.

The invention discloses a load rejection device for a submersible, and relates to the technical field of submersible, and the load rejection device for the submersible comprises a counterweight part and a release assembly. The releasing assembly comprises a sealing bin, a sealing door, a pressure difference adjusting mechanism and a traction and pushing composite mechanism. The sealing bin is arranged on the submersible, and the balance weight piece is arranged in the sealing bin. The sealing bin is provided with a release opening used for discarding the balance weight piece, and the sealing door covers the release opening and can make sealing contact with the sealing bin. The pressure difference adjusting mechanism is used for adjusting the pressure difference between the sealing bin and the external environment. The traction and pushing composite mechanism can be connected with the balance weight piece in an attraction mode and can also push the tractor to move in the throwing direction of the balance weight piece. Manual and automatic release configuration can be met at the same time, and the balance weight release stability is improved; meanwhile, the corrosion problem caused by the fact that the balance weight is exposed in seawater for a long time can be avoided; and the balance weight can be maintained by using the pressure difference, so that the energy consumption is reduced.

This invention provides a nuclear power unit system comprising: a high-pressure cylinder; a deaerator for deoxygenating condensate entering the deaerator using steam output from the high-pressure cylinder; a main steam system for providing first auxiliary steam to the deaerator; an auxiliary steam system for providing second auxiliary steam to the deaerator, enabling the deaerator to operate under no-load constant-pressure conditions; a pressure detection module for acquiring the deaerator pressure; a first-order hysteresis module for issuing a trigger signal when the turbine of the nuclear power unit experiences a load shedding condition based on the deaerator pressure; and a regulating module for maintaining the deaerator pressure at the pre-load shedding pressure for a preset time and then decreasing it at a preset rate upon receiving the trigger signal. This invention introduces a first-order inertial filtering module, which can accurately identify deaerator pressure changes, thereby accurately detecting turbine load shedding conditions, ensuring deaerator pressure stability, and contributing to the long-term stable operation of the nuclear power unit.

The utility model discloses a water turbine runner and a water turbine. The rotating wheel is of a double-layer reverse impeller structure, an upper impeller and a lower impeller are in a quarter spherical shell shape, the concave directions of arc-shaped impact faces are opposite, and double-working-condition control is achieved by switching the jet flow direction of a nozzle through a deflector. During load shedding, the deflector guides jet flow to the upper impeller which is sunken in the reverse direction, and reverse torque is generated to achieve rapid braking.

The invention discloses a control method and a control device of an impulse turbine and the impulse turbine, and relates to the field of water turbines.The impulse turbine comprises a plurality of nozzles and a rotating wheel, the nozzles are arranged around the rotating wheel, the nozzles form a plurality of nozzle sets, each nozzle set comprises at least two nozzles, and the nozzles are arranged around the rotating wheel. The control method comprises the steps that the opening and closing time of a needle valve of the nozzle is adjusted to be first preset time, the opening and closing time is the time consumed by the needle valve from closing to complete opening or from complete opening to closing, and the first preset time is any value between 30 s and 45 s; judging whether the impulse turbine is in a load shedding working condition; and if it is judged that the impulse turbine is in the load shedding working condition, the multiple nozzle sets are closed in sequence. Therefore, when the impulse water turbine is in the load shedding working condition, the multiple nozzle sets are sequentially closed, the water hammer pressure of the pressure water conveying pipeline system of the impulse water power station can be effectively improved, and the safety of the pressure water conveying pipeline system of the impulse water power station is improved.

The application provides a kind of compressed air energy storage power generation system load rejection stability control system and control method, gas storage tank;Air inlet of the air inlet regulating pipeline is communicated with gas storage tank;Heating expansion pipeline;Control terminal is used to obtain the real-time temperature of the air inlet of the second expander, at least one first expander respectively and the real-time rotating speed of the main shaft of generator, determines the rotating speed difference value based on the real-time rotating speed and rated rotating speed, generates target control strategy set based on the rotating speed difference value, the real-time temperature of the air inlet of the second expander and at least one first expander.The application solves the problem that the rotating speed is difficult to stabilize quickly after load rejection in the compressed air energy storage power generation of prior art.

The invention discloses a tail water system of a water turbine and a pressure regulating method. The tail water system comprises a tail water pipe, and a tail water air supply system is arranged on the tail water pipe to replace a surge shaft to form the water turbine tail water system. The tail water air supply system comprises a forced air supply device. According to the pressure regulating method, when the working condition of great load reduction or load shedding occurs in the water turbine, the tail water gas supplementing system connected with the tail water pipe is started, and gas is supplemented into the tail water pipe through the tail water gas supplementing system. The water hammer and reverse water hammer phenomena in the draft tube can be effectively restrained, complex civil engineering is not needed, pressure regulation and control are directly achieved through combination of a pipeline and a valve, and the construction cost and layout difficulty of a power station are remarkably reduced; accumulated water in a connecting pipeline can be emptied within several seconds, negative pressure rise can be rapidly restrained, part damage caused by response lag of a traditional surge shaft is avoided, the natural air supplementing device supplements air passively through a mechanical structure, extra energy consumption is not needed, balance of emergency regulation and energy-saving operation is achieved, and water turbine parts are effectively protected against damage.

The invention discloses a wide-load operation water turbine fatigue life weighted calculation method, which comprises the steps of determining the design operation life Tk of a water turbine, dividing the operation of the wide-load operation water turbine into a start-stop working condition, a load shedding and runaway working condition and a normal operation working condition, and dividing the normal operation working condition into different load sections, the method comprises the following steps: drawing a material fatigue characteristic curve according to each cycle period number and the stress amplitude, calculating a fatigue damage coefficient D, fatigue life T = 1 / D and delta T = T-Tk according to the material fatigue characteristic curve, and when delta T is less than or equal to 0, re-selecting a turbine runner material and carrying out fatigue life calculation, when delta Tgt; 0, outputting the welding residual stress control value sigma res and the fatigue life T of the water turbine; based on multi-working-condition weighting factor quantitative calculation, the water turbine fatigue life is evaluated in combination with the weighting factor and the fatigue strength, and it is guaranteed that materials selected for water turbine design meet the engineering requirements.

The present application belongs to the field of automatic control technology of thermal power generating unit, and specifically discloses a BEST double-machine regenerative thermal power plant converter load rejection automatic control method, which comprises the following steps: determining the steam-driven feed water pump shaft power and the small generator shaft power; determining the pre-action opening of the BEST feed water pump turbine admission valve after the converter load rejection according to and; predicting the petro-flying speed of the BEST steam-driven feed water pump group according to and; starting the minimum flow recirculation valve control method of the steam-driven feed water pump and the BEST feed water pump turbine back pressure control method, and determining the speed control method of the BEST feed water pump turbine according to and. The present application shortens the speed fluctuation process of the BEST steam-driven feed water pump group, reduces the fluctuation amplitude of the boiler inlet feed water flow, and ensures the stability and safety of the whole unit after the converter load rejection.

The invention relates to a separation device for seabed observation equipment and a load. The technical problems that an existing seabed observation separation device is high in use cost, poor in universality and the like are solved. Comprising a seabed load rejection device, one end of the seabed load rejection device is connected with an electronic pressure-resistant control bin, the other end of the seabed load rejection device is connected with a sink coupling frame used for installing a load, and the seabed load rejection device is provided with a load rejection module fixedly connected with the electronic pressure-resistant control bin and detachably connected with the sink coupling frame. And the load rejection module is connected with a power module which is internally provided with a driving motor and is used for driving the load rejection module to release after receiving an instruction. The device has the advantages that the electronic pressure-resistant control bin, the release shell, the shell and the power module can float upwards and be recycled after load rejection of the device, and the use cost of the device is reduced. The built-in driving motor is simple in structure, small in occupied space, suitable for small equipment and higher in universality. The locking or unlocking effect on the core rod can be guaranteed through cooperation of the power module and the cylindrical ejector block.