40results about How to "Reduce the required power" patented technology

A hydrogen energy storage power station control system adopts a layered structure, comprehensively judges from electricity price information, renewable energy output, environment temperature and hydrogen storage tank state data through a reinforcement learning model, selects a hydrogen production, power generation or standby mode, and sets power targets of an electrolytic cell and a fuel cell; the middle layer uses an optimization algorithm to refine power distribution, the lower layer executes a power instruction through an industrial control algorithm, and an independent safety guarantee layer is set to monitor indexes such as hydrogen concentration, pressure and temperature. In the optimization process of the system, energy consumption and equipment life loss of an electrolytic bath and auxiliary equipment are considered at the same time, full-life-cycle economy is achieved, the economy of a hydrogen energy storage power station is improved, and the service life of key equipment is prolonged.

The present invention discloses a reactive compensation capacity allocation method, apparatus and device of a wind-photovoltaic-energy storage station, the method includes: calculating a maximum stored-energy active power and a maximum wind-power active power under different actual photovoltaic active power conditions; calculating a station reactive loss and a station reactive power corresponding to each actual photovoltaic active power condition based on an actual photovoltaic active power, the maximum stored-energy active power and the maximum wind-power active power under each actual photovoltaic active power condition; determining a reactive compensation demand under each actual photovoltaic active power condition by using a difference between the station reactive loss and the station reactive power under each actual photovoltaic active power condition; and determining a reactive compensation capacity by using a maximum reactive compensation demand of the reactive compensation demand under each actual photovoltaic active power condition, so as to allocate an idle capacity of a stored-energy field area according to the reactive compensation capacity. The technical solutions of the present invention improve the accuracy of the reactive compensation capacity allocation of the wind-photovoltaic-energy storage station.

The invention discloses a photoelectric sensor system conversion efficiency calibration system and method based on a reverberation chamber, and belongs to the technical field of photoelectric sensor conversion efficiency calibration, the system comprises an electric wave reverberation chamber, a transmitting antenna, a reference antenna and a photoelectric field sensor system; the photoelectric field sensor system is composed of a photoelectric sensor, a laser source, a photoelectric detector, a polarization maintaining optical fiber and a single-mode optical fiber. In the calibration process, the reference antenna and the photoelectric sensor system are used as receiving ends respectively, receiving power at different stirring positions in the reverberation chamber is sampled to obtain two groups of transfer functions, and the total efficiency of the photoelectric sensor system is determined by comparing the two groups of transfer functions under the condition that the radiation efficiency of the reference antenna is known. The conversion efficiency of the photoelectric sensor system is obtained by combining the relation among the power, the field intensity and the total efficiency in the free space; and the effective averaging of the incident direction and the polarization state is realized by using the uniform and isotropic electromagnetic field characteristics of the reverberation chamber.

Provided are an energy conversion system, an over-temperature operation control method thereof, and a control apparatus (00), comprising: in accordance with the operating temperatures of at least two power modules, determining an over-temperature module and at least one non-over-temperature module; obtaining a derated operating power and a power derating difference value for the over-temperature module, and, in accordance with the power derating difference value, determining at least one increased-rating operating power, wherein the increased-rating operating power corresponds one-to-one to a non-over-temperature module; on the basis of the at least one increased-rating operating power, determining whether the system satisfies a preset no-derating operating condition; if the system satisfies the preset no-derating operating condition, then driving the over-temperature module to operate in accordance with the derated operating power, and driving the non-over-temperature module(s) to operate in accordance with the increased-rating operating power. By reducing the operating power of the over-temperature module, the temperature thereof is lowered, and by increasing the operating power of a non-over-temperature module, the overall power of the system can be kept unchanged, which is beneficial to improving system safety performance and power generation.

The invention relates to a renewable energy local consumption method based on an isolated micro-grid, and the method comprises the steps: constructing a layered distributed cooperative control architecture for the micro-grid, enabling a local control layer to collect the operation environment parameters and performance parameters of power generation equipment and energy storage equipment in real time, and enabling a central control layer to carry out the multi-time-scale energy optimization configuration according to the real-time equipment parameters; the real-time power of the micro-grid is balanced by responding to instantaneous changes of renewable energy sources and loads in an ultra-short-term optimization manner; an energy distribution plan of the next day is formulated through short-term optimization; power generation equipment and energy storage configuration are optimized in a medium-and-long term manner, and then global optimization decision making is performed to obtain an energy scheduling plan among the regions; and the regional coordination layer performs cooperative control on equipment in the region based on the energy scheduling instruction. Compared with the prior art, the method has the advantages that the special environment and technical problems of high-cold and high-altitude areas are solved, the local consumption efficiency of renewable energy in the isolated micro-grid is remarkably improved, the wind curtailment rate and the light curtailment rate are reduced, and the stability and the reliability of the micro-grid system are enhanced.

This utility model relates to a lifting device with dynamic gravity compensation, including a support frame, a transmission lifting device, a sliding frame sliding on the support frame, a fixed pulley group set on the top of the support frame, a tension spring for relieving pressure on the lifting device, a movable pulley group set on the tension spring, and a steel rope for pulling the sliding frame. The lifting device is set inside the support frame; the working end of the lifting device is connected to the sliding frame; a connecting piece is set on the side wall of the support frame; one end of the tension spring is set on the connecting piece; the other end of the tension spring is set on the movable pulley group; the fixed pulley group includes several sets of first pulley bodies; the movable pulley group includes several sets of second pulley bodies; the steel rope is wound around the first pulley bodies and the second pulley bodies in sequence. This invention solves the problem that the transmission structure of traditional lifting devices is relatively simple, often using a single steel wire rope or chain to directly connect the motor and the lifting platform, which cannot effectively amplify the stroke of the steel wire rope.

The present application relates to the technical field of air extractor, particularly relates to a direct drive improvement device of oil pumping unit; including tower body, platform, driver, shaft coupling, drum, crown assembly, belt, oil pumping rod, counterweight box and liquid cooling mechanism, the liquid cooling mechanism includes motor shell cooler, the platform is fixedly arranged on the top of the tower body, the driver, crown assembly and motor shell cooler are all fixedly arranged on the platform, the drum is rotatably arranged on the platform and located on one side of the driver, the driver and drum are drivingly connected through the shaft coupling, the crown assembly is located on one side of the driver, shaft coupling and drum, the belt is slidably arranged on the drum and crown assembly, the oil pumping rod and counterweight box are respectively fixedly arranged at two ends of the belt, the oil pumping rod is located on one side of the tower body, and the counterweight box is located below the platform; energy consumption is significantly reduced, frequent maintenance is not needed, and mechanical noise of the traditional reduction gearbox is eliminated.

The application provides a kind of self-adaptive temperature control system and method of pump laser for guaranteeing output power stability, and relates to the technical field of laser temperature control.The method comprises the following steps:step S1: calculating the current temperature difference and the real-time change rate of pump laser output optical power;step S2: judging whether the current temperature difference exceeds the temperature difference threshold;step S3: confirming whether the real-time change rate of the current pump laser output optical power exceeds the output optical power change rate threshold;step S4: if the real-time change rate of the current pump laser output optical power exceeds the output optical power change rate threshold, the current temperature control target is issued to the temperature control execution module and the temperature control is started;step S5: repeating the above steps S1 to S4.The system comprises a processor, a detection module and a temperature control execution module.Based on this, the application solves the problem that the existing TEC temperature control system and method cannot adapt to environmental temperature changes, thereby making it difficult to effectively guarantee the stability of pump laser output power.

The invention provides a novel single-stage current source type direct current power flow controller, and aims to solve the problem of power flow regulation and control between distributed renewable energy sources and a direct current power grid. The controller reduces the loss of the transformer through a partial power flow mode, has the ZCS soft switching capability, and reduces the power conversion loss. The topological structure is composed of a transformer primary side half-bridge, a transformer and a secondary side half-bridge, and power flow regulation and control are achieved by adjusting output voltage. The controller can effectively work during bidirectional tidal current flow, and is suitable for occasions with large line resistance change. Simulation verification shows that the controller has excellent adjusting capability and efficiency in a Plecs environment, and powerful support is provided for flexible control of a direct current power grid.

The application discloses a power battery full life cycle health state online correction method based on cloud edge cooperation and relates to the technical field of battery management. First, a unified multi-dimensional health state parameter group of the cloud end and the vehicle end is established, a limitation identifier is mapped and recorded at the single-body-module-pack level, and a vehicle-end health state initial value, a cloud-end health state estimated value and a confidence level are obtained respectively. Secondly, the cloud end defines a key control output index and constructs a control sensitivity relationship, solves a recommended correction amount in combination with a risk cost constraint, generates a correction instruction package containing a recommended working condition window, a maximum step and a maximum change rate, and issues the correction instruction package. Finally, the vehicle end executes according to the working condition gate, performs shadow verification, smoothes and fuses, and updates the control parameters in linkage, monitors the deviation and safety events in the verification window, and reports the abnormal rollback; the method reduces display jump and power limit value fluctuation, reduces false positives, and improves caliber consistency and stability.

The present application relates to natural rubber primary processing equipment technical field, specifically to a kind of natural rubber crepe machine, including rack, transmission system, first roller group and second roller group along vertical series connection, roller cooling system, doctor system and discharge separation system.The first driving roller shaft end of first roller group is equipped with sprocket, is driven connection with second roller group by chain, so that a motor synchronously drives four roller operation, material is sequentially completed rough dehydration and fine dehydration from top to bottom.Four rollers are all hollow structure with spiral flow guide groove inside, and two ends hollow shaft head are connected into cooling system by three-section rotary joint formed by external connector, connecting shaft and internal connector, to form forced circulation cooling loop to control roller surface temperature.The present application is compact in structure, and single machine can realize continuous twice dehydration and automatic solid-liquid separation, suitable for natural rubber forest and rubber collecting station primary operation.

The invention discloses a large bidirectional reciprocating supercharger, which comprises a valve body, a piston cavity, a reversing valve cavity, a high-pressure oil duct, an oil inlet duct and an oil return duct are arranged in the valve body; the two high-pressure oil ports are formed in the valve body and both communicated with the high-pressure oil duct; the two high-pressure oil ports are distributed in the two axial sides of the piston cavity and communicate with the piston cavity. The piston is positioned in the piston cavity; the reversing valve is located in the reversing valve cavity and can reciprocate in the axial direction; the reversing valve is used for driving the piston to move in a reciprocating mode in the axial direction and supplying oil to the two high-pressure oil ports so that bidirectional pressurization can be conducted. The linkage design of the reversing valve and the piston is adopted, the reversing valve periodically reciprocates in the axial direction of the valve body, and the piston is directly driven to synchronously move; the piston alternately compresses the cavities on the two axial sides of the piston cavity under the action of the reversing valve, so that liquid can be compressed and output in two directions, continuous pressurization operation is achieved through a two-way compression mechanism, the flow conversion efficiency is improved, and output fluctuation is reduced.

The utility model provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a box body, a heat insulation part and a plurality of single batteries, the box body comprises a protection part, a bottom wall and a side wall connected to the bottom wall, the bottom wall and the side wall define an accommodating area for accommodating a plurality of battery monomers, the protection part is connected to the outer side, deviating from the accommodating area, of the bottom wall, and a filling space is formed between the protection part and the bottom wall; at least one beam body is arranged in the box body, the beam body is connected to the inner side, deviating from the protection piece, of the bottom wall, the beam body is used for dividing the accommodating area into a plurality of sub-areas, and at least one battery monomer is accommodated in each sub-area; the heat insulation component comprises a first heat insulation part and a second heat insulation part, the filling space is filled with the first heat insulation part, and the second heat insulation part is arranged between the beam body and the bottom wall. By arranging the first heat insulation part and the second heat insulation part, the heat insulation capacity of the battery device is improved, and the power and the cost of a heat management system of the battery device are reduced.

The invention discloses a thermal management system and a vehicle, and the thermal management system comprises a compressor which is provided with an exhaust port and an air inlet; the outdoor condenser is provided with a first inlet and a first outlet, and the first inlet is communicated with the exhaust port; the electric drive system comprises an electric drive direct cooling plate, the electric drive direct cooling plate is provided with a second inlet and a second outlet, the second outlet is communicated with the air inlet and the first inlet, and the second inlet is communicated with the first outlet; one end of the first pipeline is connected between the exhaust port and the first inlet, and the other end of the first pipeline is connected between the air inlet and the second outlet; the second pipeline and the third pipeline are connected between the first outlet and the second inlet in parallel, a refrigerant pump is arranged on the second pipeline, and a first electronic expansion valve is arranged on the third pipeline. According to the thermal management system, flexible switching between the two modes can be achieved according to the actual heat dissipation requirement of the electric drive system and the whole vehicle operation working condition.

The invention provides a gallium nitride-based semiconductor laser with a quantum tunneling hole injection layer, the quantum tunneling hole injection layer is arranged in the laser, and SIMS test Al ion strength or Al atom concentration distribution in the quantum tunneling hole injection layer has asymmetric double-S-type function distribution. A peak value region of valence band effective state density and a valley value region of hole mobility are formed in the quantum tunneling hole injection layer, and the peak value position of the valence band effective state density just corresponds to the valley value position of the hole mobility, so that a quantum tunneling region is formed, and diffusion, migration and hot electron emission of hole carriers are blocked. The hole tunneling probability of the layer is enhanced, hole carriers are made to jump and pass through the upper limiting layer and the upper waveguide layer in a quantum tunneling mode, hole wave function distribution and light field distribution injected into the active layer are regulated and controlled, the quantum recombination efficiency of the gallium nitride laser is enhanced, light absorption loss is reduced, and the threshold value and the lasing power of the laser are reduced; and the aging light attenuation of the laser is improved.

The utility model relates to the technical field of aluminum ingot transportation, in particular to a transportation device for aluminum ingot processing, which comprises an X-axis track, a moving frame arranged on the X-axis track in a sliding manner, an X-axis driving component for driving the moving frame to move, a power supply component and a positioning component, and a Y-axis track, a frame body and a Y-axis driving component for driving the frame body to move are arranged on the moving frame. A Z-axis rail, a forklift arm and a Z-axis driving assembly for driving the forklift arm to move are arranged on the frame body, and a balance weight assembly for balancing weight is arranged on the movable frame. The X-axis driving assembly, the Z-axis driving assembly and the Y-axis driving assembly are matched to enable the forklift arm to fork aluminum ingots, after forking is completed, the X-axis driving assembly, the Y-axis driving assembly and the Z-axis driving assembly are matched to enable the forklift arm to move to the position where the aluminum ingots are transferred, and during the period, the counterweight assembly carries out weight balancing, the gravity center is stabilized, and the aluminum ingots are transferred. And the probability of rollover caused by heavy aluminum ingots is reduced, so that the convenience and stability of aluminum ingot transportation are improved.

The application relates to the technical field of hydraulic pumps, in particular to a multistage pressure regulating control device of a hydraulic pump. The regulating control device comprises a plug, a valve seat, a valve body, three valve cores, three jacks, a pressure regulating spring, the left side of the plug is mounted on the valve seat to seal, and the right side is sealed by rotating a regulating screw; the valve body is installed in the valve seat, three valve cores are sequentially installed in the valve body from left to right, the outer side walls of the middle sections of the three valve cores are tightly attached to the inner side walls of the valve body, the outer diameters of the middle sections of the three valve cores sequentially decrease from left to right, three cavities are formed between the plug and the three valve cores, one jack is inserted in each valve core, and the pressure regulating spring is installed at the right end of the rightmost jack; and corresponding ports and holes are formed on the valve seat and the valve body to form an oil flow channel. The device is designed with three oil inlets corresponding to three cavities, so that the hydraulic pump can work in a multistage pressure mode, the system heating and energy loss are reduced, and energy saving, emission reduction and energy optimization are realized.

This application provides a fuel cell hydrogen circulation system and its regulation method and apparatus, belonging to the field of fuel cell technology. The system includes a hydrogen storage tank forming the anode circuit, a pressure reducing valve, a purge valve, a vapor-water separator, and a vacuum pump, and a fuel cell stack connected between the pressure reducing valve and the purge valve. The method includes: when the fuel cell stack starts up, acquiring the operating current of the fuel cell stack according to a sampling period; controlling the purge valve to open according to the operating current, the sampling period, and the purge period, so that the purge valve purges the generated water in the fuel cell stack to the vapor-water separator; when the purge valve closes, controlling the vacuum pump to start, so that the vacuum pump pumps the hydrogen in the vapor-water separator back to the fuel cell stack's air inlet; during the operation of the fuel cell stack, controlling the vapor-water separator to discharge the generated water according to a drainage period. This application aims to reduce the cost, noise, and parasitic power of the fuel cell hydrogen circulation system.

The present application relates to the technical field of micro-grid autonomous control and micro-grid coordination control, and particularly relates to a micro-grid voltage and power self-balancing coordination control method and system, which is based on a double-delay deep deterministic policy gradient (TD3) and introduces a squeeze-and-excitation (SE) channel attention mechanism at a state perception end to adaptively calibrate weights of observation features including node voltage, renewable available output, load coefficient, energy storage SOC, charging station demand pool, PCC interactive power deviation and time coding; a master-slave cascaded decoupling strategy structure is constructed at an action decision end to decompose multi-dimensional continuous actions into master branch output and slave branch compensation output conditioned on the master branch output, and to generate active and reactive control instructions of photovoltaic, wind power, diesel generator, energy storage and charging station according to fixed mapping.

An LED driver according to an embodiment of the present disclosure may include: a plurality of channel terminals connected to a plurality of LEDs and each including a channel current source; a scan switch connected to the plurality of LEDs and configured for a scan operation; a plurality of scan terminals including a first charge sharing switch for moving charges of any one of a plurality of first capacitors forming capacitance between the plurality of LEDs and the scan switch to another first capacitor; and a switch controller for controlling the first charge sharing switch.

The invention discloses an energy-saving nut cleaning and sorting system based on flotation separation, and particularly relates to the field of agricultural product processing. The energy-saving nut cleaning and sorting system comprises a water tank, a cleaning roller with a cleaning mechanism is arranged on one side of the middle of the water tank, and a driving mechanism for driving the cleaning roller to rotate is arranged at the bottom of the cleaning roller; a first conveying belt used for fishing immature nuts and a third conveying belt used for fishing mature nuts are arranged on the side, away from the cleaning roller, of the inner cavity of the water tank. According to the invention, cleaning, conveying, sorting and pollution discharge functions are integrated in a single water tank system, and a first motor and a liquid pump work cooperatively, so that compared with a traditional multi-equipment series connection production line, the number of equipment, the occupied area and the total installed power are greatly reduced, system-level energy conservation is realized, and the overall energy consumption is reduced; and through cooperation of the driving mechanism and the cleaning mechanism, the nuts can be automatically cleaned, and the efficient cleaning effect is achieved.

This invention discloses a PUHD panoramic head-up display optical system with a high-reflectivity windshield. It includes an image source, from which light is projected onto the windshield. The windshield has a reflective film layer that enhances the light energy from the image source. It also has a black coating layer that enhances the contrast of the displayed image and absorbs light to prevent ghosting. The light emitted from the image source is reflected by the windshield and enters the human eye. The human eye perceives a virtual image located on a virtual image surface in front of the windshield. The windshield, the black coating layer, and the reflective film layer constitute a high-reflectivity windshield structure. This invention improves the reflectivity of the windshield display area by setting a reflective film layer in the black display area of ​​the black coating layer. This windshield can reflect more than 30% of the light energy from the backlight module screen (reflectivity is adjustable), increasing the brightness to the eye and significantly reducing the brightness, backlight power, and cost of the backlight module.

The application relates to a pot anti-burning control method, system and readable storage medium. The method comprises the following steps: acquiring a monitoring image of a to-be-monitored area and a concentration of a target gas; determining a blackening index of the pot based on the monitoring image; determining a burning risk index of the pot based on the concentration and a corresponding first weight, the blackening index and a corresponding second weight; the first weight and the second weight are determined based on an occlusion index, which is used to represent the occlusion degree of environmental interference factors on the pot; when the burning risk index is greater than a first preset threshold, a control signal is generated to control the corresponding stove to reduce power or shut down. By using the method, accurate early warning and corresponding control can be realized in the early stage of burning.

The invention provides an energy scheduling and MPPT (Maximum Power Point Tracking) control system and method suitable for multi-path photovoltaic. The system comprises a plurality of photovoltaic panels, a photovoltaic conversion module, a battery bus, a battery management module and a main control module, wherein the main control module integrates a sampling unit, an energy scheduling unit, an MPPT control unit and a comparator. The sampling unit obtains voltages and currents of all paths of photovoltaic and battery buses, the energy dispatching unit distributes reference power under the constraint of target charging power, the MPPT control unit drives all photovoltaic conversion modules to track the maximum power point under the constraint of the reference power, and the comparator compares a sampling electrical parameter with a safety threshold value. And the corresponding photovoltaic conversion module is turned off through the independent hardware access during overrun. According to the scheme, matching of multi-path photovoltaic power and battery requirements is achieved, the photovoltaic energy utilization rate is improved, fluctuation of a battery bus is reduced, and the fault response speed and the system safety are improved.

The present application relates to the technical field of sorting, and in particular to a series-parallel conversion multi-mechanical arm gangue sorting system and a control strategy thereof. The series-parallel conversion multi-mechanical arm gangue sorting system comprises a belt conveyor, a vibrating screening device, and a plurality of mechanical arm sorting devices arranged along the conveying direction of the belt conveyor. Each of the mechanical arm sorting devices comprises two multi-degree-of-freedom mechanical arms. The functional modes of the mechanical grippers on the mechanical arms can be divided into two modes: a grabbing mode and a pushing-off mode. A controller controls the two mechanical arms to independently perform sorting under series control or controls the two mechanical arms in the same mechanical arm sorting device to cooperatively perform sorting under parallel control. The sorting control strategy determines three sorting actions by judging the distribution position and particle size of the coal gangue. The present application is suitable for gangue sorting under complex working conditions through series-parallel conversion control, and improves the sorting efficiency and sorting accuracy.

The application provides a wind power timing adaptive window adjustment method and device based on reinforcement learning, wherein the method comprises the following steps: collecting multi-source timing data from a wind turbine system or a database, and preprocessing the multi-source timing data to obtain a preprocessing data set; dividing the preprocessing data set according to a time sequence principle to obtain training data; training an initial LSTM model based on the training data to obtain a target LSTM model, and training a reinforcement learning model according to an output value of the target LSTM model and a reinforcement learning strategy; performing prediction based on the reinforcement learning model and the target LSTM model to obtain a prediction value, and inputting the prediction value and a real-time power feedback error into a discrete PID controller to obtain a control amount for driving a wind turbine actuator. The application combines the deep timing modeling capability of LSTM and the dynamic decision-making capability of reinforcement learning to intelligently adjust the length of a historical time window in wind power prediction.

The invention discloses a miniature two-way reciprocating supercharger which comprises a valve body. A piston cavity, an oil inlet channel, an oil return channel, a control oil channel, a feedback oil channel and a high-pressure oil channel are arranged in the valve body. Three connecting ports are formed in the piston cavity and are respectively communicated with the oil inlet channel, the feedback oil channel and the oil return channel; the two axial ends of the piston cavity are further provided with high-pressure connecting ports correspondingly, and the high-pressure connecting ports communicate with the high-pressure oil way. The piston is positioned in the piston cavity; the piston comprises a large piston and two small pistons, and the two small pistons are distributed on the two axial sides of the large piston and connected with the large piston; the reversing valve is arranged in the valve body; the feedback structure is arranged on the large piston and used for switching communication between any two adjacent connecting ports so as to trigger the reversing valve to reverse; the reversing valve is used for driving the piston to move in a reciprocating mode in the axial direction and supplying oil to the two high-pressure connectors so as to carry out bidirectional continuous pressurization operation, a bidirectional compression mechanism is achieved, the flow conversion efficiency is improved, and output fluctuation is reduced.

This invention provides a high-temperature conductive silver paste for a microcrystalline glass thick-film heating plate, its preparation method, and sintering process. The high-temperature conductive silver paste for the microcrystalline glass thick-film heating plate, by mass percentage, comprises: silver powder: 75-85%; composite glass powder: 1-5%; organic carrier: 10-24%. The composite glass powder comprises component A and component B in a mass ratio of 1-3:1. Component B is silicon micropowder. Component A, by mass percentage, comprises: silicon oxide: 35-50%; boric acid: 20-30%; magnesium oxide: 10-15%; aluminum oxide: 5-10%; titanium oxide: 3-5%; and zirconium oxide: 1-2%. The high-temperature conductive silver paste for the microcrystalline glass thick-film heating plate prepared by this invention has high solderability, strong adhesion, a maximum operating temperature exceeding 450℃, strong resistance to high current impact, high re-firing stability, and excellent overall performance.

This invention provides a black-start method for a grid-connected SVG (Static Energy Storage) system in conjunction with a renewable energy power plant, comprising: when the entire photovoltaic power plant experiences a voltage loss, the black-start control unit sends a start command to the grid-connected SVG, which establishes an initial voltage; after the grid-connected energy storage system is energized, the black-start control unit sends a grid-connection command to the grid-connected energy storage system, which then connects to the grid and outputs active power; the black-start control unit restores the plant's auxiliary power system based on the active power output and sends grid-connection commands to the renewable energy generation units, which then connect to the grid and assume active power output; when all renewable energy generation units are connected to the grid, it is determined whether the black-start of the entire power plant is complete. If so, the photovoltaic power plant enters a stable operating state; if a fault occurs, a fault handling procedure is executed according to preset rules. This invention enables rapid and orderly power restoration of centralized renewable energy power plants equipped with grid-connected energy storage systems and grid-connected SVGs after a complete voltage loss, ensuring the power supply safety of the power plant and assisting in the gradual restoration of power supply capabilities.

The utility model discloses a negative-pressure treatment device for tail gas generated in dimethyl phosphite production. The negative-pressure treatment device comprises a vacuum part, a condensation part and an absorption treatment part, the vacuum part comprises a buffer tank A, a Roots vacuum pump unit and a buffer tank B, the buffer tank A is provided with a tail gas inlet A, a tail gas outlet A and a methanol collecting tank A, the tail gas outlet A is connected with the Roots vacuum pump unit through a gas inlet pipeline, the Roots vacuum pump unit is connected with the buffer tank B through a gas outlet pipeline, and the top of the buffer tank B is provided with a tail gas outlet B; a methanol collecting tank B is arranged at the bottom of the buffer tank B; the condensing part comprises a condenser and a methanol collecting tank C, the tail gas outlet B is connected with the condenser, and the lower end of the condenser is connected with the methanol collecting tank C; the absorption treatment part comprises a multi-stage water absorption tower and an alkali absorption tower, the condenser is connected with the multi-stage water absorption tower, the multi-stage water absorption tower is connected with the alkali absorption tower, and a tail gas output pipeline is arranged at the top of the alkali absorption tower; the device disclosed by the utility model has the advantages of low production cost, high recycling rate and good chloromethane product quality.