22 results about "Load rejection" patented technology

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 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 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.

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 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 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.

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 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.

The invention discloses a bidirectional synchronous releasing device. The device comprises a buoy unit, a load rejection unit, a driver, a sliding rail, an upper sliding block, a lower sliding block, an upper shell and a lower shell. The buoy unit comprises a pressing plate, a buoy, a nylon yarn rope, a long compression spring, a long sliding rod and a buckle. The load rejection unit comprises a mounting seat, a load rejection block, a short sliding rod, a short compression spring and a steel ball; the buoy unit is arranged in the upper shell and connected with the sliding rail through an upper sliding block. The load rejection unit is arranged in the lower shell and connected with the sliding rail through a lower sliding block. The sliding rail is connected with the driver; the driver drives the upper sliding block and the lower sliding block on the sliding rail to move, and then the synchronous action of upward releasing of a buoy of the buoy unit and downward releasing of a load rejection block of the load rejection unit is achieved. According to the device, mechanical limiting and spring force storage design is adopted, continuous power supply or initiating explosive devices are not needed, environmental interference is avoided, and safety is high; the structure is simple.

The utility model relates to the technical field of load rejection devices, and discloses a fixed-depth load rejection device which comprises a device body, an installation plate arranged in the device body, a hook assembly fixedly installed on the installation plate, a protective cover arranged on the installation plate and an air cylinder arranged in the protective cover. An activator works and activates a thermal battery, the thermal battery outputs direct current to an electric exploder in a gas cylinder assembly after being activated, the electric exploder ignites to push a ram to move and break an exhaust nozzle, high-pressure nitrogen stored in a high-pressure gas cylinder is output to an unlocking mechanism from the exhaust nozzle along a pipeline, and gas enters a pneumatic pin through a gas inlet; and when the exposed section of the pin shaft completely retreats into the shell, the limiting plate is clamped into the limiting groove under the action of the torsional spring, the pin shaft is locked, at the moment, the load is unlocked, after unlocking, high-pressure gas enters the air cylinder along the pipeline, and an air cylinder piston pushes the hook assembly to achieve hook movement.

The invention relates to the technical field of steam turbine rotating speed calculation, and discloses a calculation method and device for parameters influencing the rotating speed of a steam turbine. After a steam inlet valve of the steam turbine is jammed, the method comprises the steps that rated working parameters of the steam turbine under the load shedding working condition are obtained; based on the rated working parameters, working distribution coefficients of a high-pressure cylinder and a medium-low-pressure cylinder of the steam turbine are obtained through calculation; calculating a closing time parameter of the steam inlet valve based on the closing state of the steam inlet valve; and based on the rated working parameters, the acting distribution coefficient and the closing time parameters, the maximum rotating speed of the steam turbine is calculated. According to the method, the rotating speed after the steam inlet valve of the steam turbine is jammed can be calculated based on the key factors influencing the rotating speed, the reliability of priority troubleshooting and maintenance can be improved, and a theoretical basis and a calculation tool are provided for accident inversion and regulation formulation.

A regulation rod control method and apparatus, an electronic device, a nuclear power plant system, and a medium, relating to the technical field of nuclear power plant safety. The method comprises: in response to operating condition information of a nuclear power plant system being a load rejection condition, acquiring a target power of a reactor; determining a secondary loop load demand signal on the basis of the target power and an initial correction factor; on the basis of the secondary loop load demand signal and a first initial position of power regulation rods, controlling the power regulation rods to move; adjusting the initial correction factor on the basis of a second initial position of temperature regulation rods to obtain a target correction factor; on the basis of the target correction factor, the target power, a measured temperature of a primary loop subsystem, and a measured power of the reactor, controlling the temperature regulation rods to move to an intermediate position; and injecting demineralized water into the primary loop subsystem on the basis of the intermediate position and a preset safe position until the temperature regulation rods reach the safe position, thereby quickly improving the safety of the nuclear power plant under the load rejection condition.

A kind of automatic control method of steam turbine shaft seal system under full-automatic load rejection working condition, its control strategy includes: A, shaft seal steam supply regulating valve control strategy: after load rejection or FCB triggers, shaft seal steam supply regulating valve first opens to a certain degree, then automatically invests shaft seal pressure;B, shaft seal overflow valve control strategy: after load rejection or FCB triggers, shaft seal overflow valve cuts manual, automatically gives instruction to 0%;C, shaft seal steam supply desuperheating water regulating valve control strategy: after load rejection or FCB triggers, shaft seal steam supply desuperheating water regulating valve cuts manual, automatically gives instruction to 0%;D, shaft seal mother tube drain valve control strategy: after load rejection or FCB triggers, shaft seal mother tube drain valve automatically opens.This application is successfully applied to a million unit, and the unit 75% FCB and 100% full-automatic load rejection test are all successful, and the unit has the condition of fast grid connection with load after test completion, and fully meet the requirements of safe and stable operation of unit.

The invention provides a gas turbine load shedding control method and device and a storage medium. The control method comprises the steps that when an abnormal signal is received, monitoring information about whether any one of a main transformer switch or a generator set switch is disconnected or not is obtained; judging whether the generator set is in a running period or a start-stop period when the abnormal signal is received; calling a power time sequence signal of the gas turbine load from receiving the abnormal signal to returning to the load basic value; acquiring the ratio of power sequence signals of the gas turbine load smaller than the critical point in the second sampling window; when the ratio is larger than a set threshold value, a first instruction is sent to the gas turbine, so that the gas turbine is switched to a diffusion combustion mode from a premixed combustion mode; and when the gas turbine inlet guide vane opening degree, the gas turbine exhaust temperature correction value and the natural gas pressure reach the set values, a second instruction is sent to the gas turbine, so that the gas turbine is switched to the premixed combustion mode. By adopting the control method provided by the invention, an external network impact trap is effectively avoided, and accurate load shedding control is realized.

The invention provides a supercritical carbon dioxide power generation system based on a four-quadrant frequency converter, belongs to the technical field of supercritical carbon dioxide cycle power generation, and can at least partially solve the problems that an existing constant-speed compressor turbine or a one-way frequency converter cannot adjust the rotating speed in the starting, stopping and low-load stages; surging or liquid phase risks are easily caused; the load increasing and decreasing speed is limited by a power grid or a load box, and the peak regulation capacity is weak; in order to solve the problems that braking energy can only be dissipated through a resistance box, the system efficiency is low, adjustment is complex, and load shedding accidents are likely to happen, the four-quadrant frequency converter is arranged, electric speed increasing is provided in the starting stage, mechanical impact is reduced, and the starting and stopping success rate is increased; in the rated stage, mechanical energy output by the turbine is efficiently converted into electric energy, the electric energy is sent to a power grid or a plant alternating current bus through a grid-connected converter, and the overall energy efficiency is improved.