158 results about "Control principle" patented technology

The invention relates to the technical field of industrial process automation control, and discloses an intelligent adjusting method for an industrial waste liquid low-temperature evaporation process, which comprises the following steps of: superposing pressure step test excitation to a vacuum adjusting valve, synchronously acquiring temperature response data flow, calculating absolute error integral and SIAE and reply time characteristics of a response curve, and calculating the temperature response data flow according to the absolute error integral and SIAE and reply time characteristics of the response curve; substituting into an inverse model to solve an equivalent process gain and a time constant of the controlled object; based on the internal model control principle, PID controller parameters are dynamically calculated and updated through the calculated gain and the time constant, a control law is reconstructed to generate an execution instruction, and the problem of control divergence of a non-linear time-varying object under model mismatch is solved through active energy feature identification and a pole assignment mechanism; decoupling control and self-adaptive adjustment of fluid viscosity sudden change and equipment scaling are achieved, and the stability and control precision of the system are improved.

The invention belongs to the technical field of new energy active support stability control, and provides a fan power decoupling method based on adaptive virtual impedance and feedforward compensation. According to the method, dynamic characteristics of active power and reactive power in the system are analyzed by combining a topological structure of a doubly-fed fan grid-connected system and fan internal control, and a small signal model is constructed based on power transmission characteristics. A self-adaptive virtual impedance strategy based on power grid impedance characteristic adjustment is introduced for the problem of power coupling caused by high line impedance in a weak power grid environment and dynamic and control loop characteristics of flux linkages in a fan. Meanwhile, through a disturbance component extraction and feedforward control strategy, a disturbance signal in rotor current is introduced into a power ring for adjustment, and power decoupling control is realized. The method overcomes the limitation that an existing decoupling control technology is poor in effect, the control principle is clear, engineering implementation is easy, and the stability and the dynamic response capability of the doubly-fed fan in the weak power grid environment can be improved.

The invention provides a method for establishing a precise ammonia injection fuzzy control model based on an LSTM neural network. The method comprises the following steps: S1, analyzing historical data, cleaning, designing a membership function and formulating a fuzzy rule table; s2, constructing a control model by using an LSTM neural network algorithm to obtain an error between a predicted value and an actual value and an error change rate; and S3, comparing a prediction result of the model with an actual output result. According to the invention, an advanced neural network technology and a flexible fuzzy control strategy are fused, so that accurate adjustment of ammonia spraying of the SCR denitration system is realized. A fuzzy expert control system is built, an error, a change rate range of the error and valve opening variation corresponding to different errors and error change rates are obtained by analyzing historical data of ammonia water adjustment, and a fuzzy discourse domain and a fuzzy rule table are designed in combination with a fuzzy control principle and a system working condition. And fuzzy reasoning and fuzzy judgment are carried out on real-time data of the system, and the increment of the ammonia water regulating valve under the current working condition is calculated and regulated.

The invention discloses an aluminum electrolysis cell multi-area collaborative aluminum oxide concentration balancing method based on dynamic nested control, and relates to the technical field of industrial aluminum electrolysis cells, the method comprises the following steps: dividing an aluminum electrolysis cell into a plurality of areas based on the distribution positions of all feeders in the aluminum electrolysis cell; and respectively determining an area resistance parameter upper limit and an area resistance parameter lower limit of each area, and based on the multiple area resistance parameter upper limits and the multiple area resistance parameter lower limits, carrying out feeding control on the aluminum electrolysis cell by utilizing a dynamic nested control principle. According to the application, a method of dynamically nesting reverse stroke charging in a partial region in a whole tank insufficient-excessive charging stroke is adopted, so that automatic homogenization of alumina concentration distribution in an electrolysis production process region is realized.

The invention provides a permanent magnet motor continuous set model-free predictive control method based on Bayesian optimization, and relates to the field of permanent magnet synchronous motor control. The method comprises the following steps: acquiring a hyper-local model and an extended state observer; determining the bandwidth and the input gain as optimization variables, and obtaining a training set and a test set for Bayesian optimization; joint probability distribution of the training set and the test set is calculated through a kernel function, and a prediction mean value and a prediction variance of optimization variables are determined; an optimization variable combination is screened based on the expected value collection function, and the bandwidth and the input gain are updated based on the optimization variable combination; based on the updated extended state observer and the hyper-local model, calculating the reference voltage of the next control period by using a dead-beat control principle; the reference voltage is decomposed into basic voltage vectors through space vector modulation, and the switching sequence of the basic voltage vectors is executed according to the minimum switching times to drive the permanent magnet motor. The method is not affected by motor parameter changes, and the current prediction control steady-state performance can be improved.

The invention relates to the technical field of digital model construction of network construction type control energy storage power equipment, in particular to an energy storage electromechanical transient model construction method and system for analyzing the characteristics of a synchronous control equipment grid-connected system, and the method comprises the steps: applying double droop control to an energy storage converter system, analyzing a regulation and control principle and grid-connected equivalent external characteristics, constructing a grid-connected equivalent circuit of the double-droop control energy storage converter system; designing the structure of the energy storage converter system; according to the designed energy storage converter system structure, a double-droop control part electromechanical transient model, an energy storage body electromechanical transient model and a grid-connected interface electromechanical transient model are constructed, and a complete energy storage converter control system electromechanical transient model capable of being embedded into a PSASP main interface is formed. And the output power change of the converter is reflected at the access node, so that the functions of characteristic analysis, load flow calculation and the like of a regional power grid system accessed to the energy storage converter can be realized, and a technical scheme is provided for guiding the planning design of accessing the energy storage converter to the regional power grid.

The invention belongs to the field of flexible power distribution network optimization scheduling, and provides a flexible power distribution network voltage and power coordination control method and system.The method comprises the steps that firstly, according to a multi-port SOP control strategy and a linear power flow model, a flexible interconnection power distribution network voltage and power coordination control principle based on a multi-port SOP is analyzed; secondly, constructing a discrete time state space model of the flexible power distribution network based on a multi-port SOP, further establishing a voltage and transformer load coordination optimal control model, and adopting a linear quadratic regulator for solving; finally, simulation tests prove that the control method can quickly and effectively optimize the power flow distribution of the interconnected power distribution network, node voltage and transformer heavy load are improved, and the problems of power distribution network voltage out-of-limit and transformer heavy overload caused by high-proportion distributed power supply access are solved.

The invention discloses an electronic control pneumatic clutch control system and method based on a domain control principle and a vehicle, and relates to the field of automobiles. The system comprises a transmission control unit (TCU). The transmission control unit TCU is connected with a clutch control unit CCU through a signal transmission system, and the clutch control unit CCU is connected with a central clutch actuator CCA; the clutch control unit CCU comprises a gas supply module and an electric control module; the air supply module is connected with the electric control module and communicates the electric control module to the transmission control unit TCU; the electric control module comprises an electromagnetic valve assembly. The CCU is innovatively controlled according to a modular design mode through a domain control principle, the clutch control precision is met, meanwhile, the arrangement requirement of the CCU is lowered, and the overall hardware size is effectively reduced. The arrangement is more flexible, and the development cost is reduced.

Disclosed in the present disclosure are a power distribution method in an off-grid state and an energy storage system. The method comprises: on the basis of a droop control principle and by means of a target output active power corresponding to each power conversion system to be distributed, calculating a droop coefficient of each said power conversion system, so that each said power conversion system outputs the corresponding target output active power by adjusting the droop coefficient of each said power conversion system. The present disclosure solves the technical problems in the prior art of battery stacks corresponding to power conversion systems to be distributed being unable to be fully charged or discharged at the same time or the large influence of voltage fluctuation on the output precision, and achieves the technical effect of controlling the battery stacks corresponding to multiple said power conversion systems to be fully charged or discharged at the same time and improving the anti-interference capability.

The invention belongs to the technical field of virtual synchronous generator control, and particularly discloses a VSG active power decoupling control method based on feedback control, and the method comprises the following steps: analyzing the active power and reactive power of a VSG control system according to the topological structure of the VSG control system; according to the active power and reactive power analysis results of the VSG control system, constructing a small signal model of a power loop; enabling a reactive power coupling item in the small signal model of the power loop to be equivalent to a feed-forward item in an active power control loop, and obtaining a small signal model of the active power control loop considering a coupling effect; and a feedback item FQ2 is added into the small signal model of the active power control loop considering the coupling effect, and VSG active power decoupling control is realized. The problem that low-frequency oscillation caused by power control loop coupling under a high-resistance-inductance-ratio network cannot be effectively restrained through an existing VSG control technical method is solved, the control principle is simple, and implementation is easy.

The invention provides a semi-physical simulation model for an excitation converter controller of a large variable-speed pumped storage unit. The semi-physical simulation model comprises a grid-side converter controller semi-physical simulation model and a machine-side converter controller semi-physical simulation model based on an alternating-current excitation system control principle. The model has a unified standard interface to adapt to different unit models; the model can automatically adjust an excitation converter controller algorithm according to working conditions so as to adapt to different operation working conditions of the unit; the excitation converter controller under different operation conditions is modularized to adapt to future unit condition expansion requirements, and later maintenance is flexible and convenient. An MEX packaging model is adopted, so that the model is closed and is separated from controller parameter setting, and achievements of all parties are protected to the maximum extent.

The invention provides a design and application method of a sliding-mode deadbeat reaching law, and relates to the technical field of electrical engineering, and the method comprises the steps: designing a sliding-mode deadbeat reaching law SMDRL, designing a control strategy through a deadbeat control principle, defining a state change law on a sliding-mode surface through a sign function, and achieving the design of the sliding-mode deadbeat reaching law SMDRL. It is ensured that the system state converges to the sliding mode surface at the fastest speed in a control period; an improved sliding mode deadbeat reaching law ISMDRL is designed, a traditional sign function is replaced with a hyperbolic tangent function, and parameters of the hyperbolic tangent function are adjusted according to the system state; the SMDRL and the ISMDRL are applied to a speed driving system of a permanent magnet synchronous motor (PMSM), and the speed driving system comprises a PMSM mathematical model, a sliding mode speed controller with a speed disturbance observer and model prediction current control. The SMDRL is introduced from the traditional sliding mode reaching law for the first time through theoretical derivation, the convergence time of the SMDRL is the shortest, and the SMDRL is applied to a permanent magnet synchronous motor speed driving system.

The invention discloses a main distribution micro multi-level collaborative optimization regulation and control method and system adapting to non-smooth characteristics. The method comprises the following steps: constructing a converter equivalent model and a power grid topological relation according to power grid measurement data; obtaining a distributed energy three-phase reactive power piecewise function based on the converter equivalent model and a droop control principle, and performing approximate fitting by using a fitting function to obtain a droop control function; micro-grid decoupling is realized by using a node replication method and a micro-grid adjacent relation; constructing a multi-level collaborative optimization scheduling model by using a droop control function, micro-grid decoupling and an optimization objective function; and outputting a main and distribution micro-grid regulation and control strategy by using an interior point method according to the real-time data of the power grid and the multi-level collaborative optimization scheduling model in combination with a time sequence consistency strategy. The method has the advantages that it is ensured that the final regulation and control result is based on the characteristics of the distributed energy and the global characteristics of the distributed energy while the iterative calculation amount is reduced, and both pertinence and efficiency are considered.

The invention discloses a high-speed level flight ten-rotor unmanned aerial vehicle. The high-speed level flight ten-rotor unmanned aerial vehicle comprises a flight control device, a fuselage frame, a plurality of rotor assemblies on the two sides of the fuselage frame and a tail thrust assembly. The motor bases of the rotor assemblies on the two sides have a certain inclination angle, and can drive the propellers to generate thrust in the vertical direction and the lateral direction when the propellers work. A tail thrust motor of the tail thrust assembly drives a tail thrust propeller to generate thrust. Through the design of the rotor wing assembly and the tail thrust assembly, rapid flight can be achieved, and forward flight of the fuselage under the horizontal state is kept; meanwhile, the unmanned aerial vehicle adopts a modular design, multiple unmanned aerial vehicles can be combined, and the carrying capacity is improved. In the control aspect, pitching, rolling, yawing, up-and-down movement and front-and-back movement of the unmanned aerial vehicle are controlled through different motor differential speeds based on a longitudinal eight-rotor structure, and height position and attitude control of the unmanned aerial vehicle can be achieved in combination with the PID control principle. Compared with a traditional unmanned aerial vehicle, the flight performance and the carrying capacity of the unmanned aerial vehicle are remarkably improved.

The invention discloses an LCL type grid-connected inverter stability analysis method based on a neural network, and the method comprises the following steps: S1, building an LCL type single-phase grid-connected inverter state space model through employing a capacitive current feedback active damping control strategy based on an inverter control principle and a zero static error current tracking control requirement; s2, determining a parameter distribution condition obeyed by key parameters in the inverter system, and obtaining a neural network data set based on parameter distribution; and S3, building a neural network based on the parameter model, and proposing a neural network stability judgment method based on feature values. The analysis method is suitable for a single-phase LCL type grid-connected inverter, and a neural network model is built according to potential characteristics of parameters to carry out stability research on an inverter system; the conclusion obtained by the scheme can be used for online analysis and evaluation of the stability of the LCL type single-phase grid-connected inverter system.

The present invention discloses a control method for switching operation permissions of a centralized control system. The method includes: when performing an operation permission switching operation on the centralized control console, determining whether the operation instruction states of the same operation buttons on the centralized control console and the local operation console are consistent; locking the operation buttons with inconsistent operation instruction states on the centralized control console and the local operation console; when operating on the currently locked operation button on the operation console with operation permissions, automatically releasing the locked state of the currently locked operation button; wherein, for the operation buttons after being locked, all operations thereof are invalid until the locked state is released. The control principle of the solution of the present invention is simple. When switching operation permissions of the operation console, by automatically locking and unlocking the operation buttons, it is ensured that the operation instructions do not change, and the safety and efficiency of the operation permission switching process are improved.

The utility model provides a computer interlocking practical training function distributed control device, and relates to the field of railway signal system practical training. The computer interlocking practical training function distributed control device comprises a control host, a point switch switching control unit and a signal machine switching control unit. The switch machine switching control unit is used for receiving a control instruction sent by the control host or acquiring first switching control information of a user on at least one first switching control button of the switch machine switching control unit, so that at least one first target relay in the switch machine acts; the annunciator switching control unit is used for enabling at least one second target relay in the annunciator to act, so that each student can observe the control process of the annunciator and the switch machine, and can master the control principle of the computer interlocking system cabinet by observing the action state of the equipment and learning and analyzing the action program of the equipment; the learning effect is improved, and the practical teaching effect is ensured.

The invention provides a ship fuel oil viscosity control simulation method and system, and the method comprises the steps: introducing gas generated by an air compressor into a gas inlet of a differential pressure type viscometer through a steam proportional valve, obtaining preset simulation viscosity in a pneumatic viscosity controller, and introducing the gas passing through the differential pressure type viscometer into a gas inlet of the pneumatic viscosity controller; the method comprises the following steps: periodically acquiring a pressure difference value of gas passing through a differential pressure type viscometer by using the differential pressure type viscometer, calculating actual simulated viscosity according to the pressure difference value of the gas, and calculating the opening degree of a steam proportional valve according to the actual simulated viscosity and preset simulated viscosity; according to the calculated opening degree of the steam proportional valve, the action of the steam proportional valve is controlled, so that the actual simulation viscosity passing through the differential pressure type viscometer reaches the preset simulation viscosity, and the visualization and controllability of the simulation process provide efficient and visual demonstration for teaching and practical training; and students can be effectively helped to quickly understand and master the viscosity control principle.

The invention belongs to the field of regulation and control of standby power supply loop devices, and provides a low-cost converter regulation and control method and system for a standby power supply system, and the method comprises the steps: sampling load voltage and current, inductive current, and DC side upper and lower capacitor voltage; selecting inductive current to perform decoupling operation, calculating expected output voltage of the converter based on a dead-beat control principle, and performing normalization processing; determining a sector with an optimal size according to an amplitude condition and a boundary condition of the expected output voltage; based on discrete space vector modulation, selecting a low common-mode voltage vector to synthesize a virtual small vector and a virtual medium vector, and expanding a candidate vector set; determining a switching sequence at the next moment according to the large and small sectors where the expected output voltage is located and the voltage difference value of the upper and lower capacitors on the direct current side to balance the neutral point voltage and the fixed switching frequency; and calculating the action time of the voltage vector according to the value function, outputting the duty ratio of the voltage vector, and applying the duty ratio to a switching device of the converter.

The application discloses a light / sound early warning method based on a vehicle distance, an intelligent cockpit and a vehicle thereof, and belongs to the technical field of intelligent control, and comprises the following steps: acquiring distance information of a host vehicle and a preceding vehicle through a vehicle-mounted sensor; detecting a distance change value of the host vehicle and the preceding vehicle in real time, generating a following vehicle strategy based on a PID control principle, comparing the distance change value with a preset threshold value, and judging whether the current distance change value reaches the preset threshold value; if the current distance change value reaches the preset threshold value, a light warning signal is sent through a vehicle-mounted light system, and a sound prompt signal is sent through an in-vehicle sound system. The early warning method provided by the application is combined with light reminding and sound prompting, when the system detects that the distance from the preceding vehicle is too close or there is a dangerous behavior, warning information is timely transmitted to the driver through flashing warning lights and sound prompting, so that the driver takes corresponding measures to ensure driving safety.

The invention discloses an intelligent mine refrigeration system, which relates to the technical field of mine refrigeration and comprises a regional thermal control unit, a state sensing module and a signal control distribution module, the regional thermal control unit is used for refrigerating by using a solid-state heat flow regulation and control principle, the state sensing module is used for detecting the running state of a heat source module, and the signal control distribution module is used for communicating local cooling node signals of each region to facilitate power and signal transmission; the regional thermal control unit comprises local cooling nodes, dynamic electric distribution regulation modules and a refrigeration regulation and control unit, the state sensing module comprises a thermal intensity acquisition unit, a hot area contour modeling module and a comparison judgment module, and the signal control distribution module is in signal communication with the dynamic electric distribution regulation modules of the local cooling nodes. And the dynamic power distribution regulation module and the refrigeration regulation and control unit are in signal communication with the comparison judgment module. The system has the characteristic of distributed regulation and control.

The novel anti-blocking steel bin comprises a bin body 1, a nitrogen pipe 3, two groups of air cannon bodies 4, an electromagnetic valve 5 and a local control box 6, a discharge port 2 is arranged at the bottom of the bin body 1, the two groups of air cannon bodies 4 are respectively mounted on two sides below the bin body 1, and each air cannon body 4 is provided with an air inlet 7, an exhaust port 8 and a blowing port 9. Blowing ports 9 of the air cannon bodies 4 are communicated with the interior of the bin body 1, air inlets 7 of the air cannon bodies 4 are connected with the nitrogen pipe 3, the two sets of electromagnetic valves 5 are arranged and installed at exhaust ports 8 of the two sets of air cannon bodies 4 respectively, and the local control box 6 is electrically connected with the two sets of electromagnetic valves 5. The circulating blowing device has the advantages that the circulating blowing effect is achieved by utilizing the double-time-relay control principle, blowing is carried out under the condition that material blockage occurs in the bin body, meanwhile, the rotating plate is pushed through the air pressure of the air cannon, the discharging opening is dredged, and stable material circulation is guaranteed.

The present invention belongs to the technical field of photovoltaic energy storage system control, and particularly relates to a sliding mode auto-disturbance rejection control method for a photovoltaic energy storage system considering source-load power fluctuations. The method includes the following steps: Step S1: Considering the power fluctuations of the source and load in the photovoltaic energy storage system, analyze the charging and discharging behavior of the storage battery, construct a mathematical model of the storage battery-photovoltaic system, and obtain the corresponding state equation; Step S2: Based on the sliding mode control and auto-disturbance rejection control principles, design the controller structure according to the mathematical model constructed in Step S1, and design the current loop; Step S3: Design each part of the voltage loop and introduce it into the controller structure designed in Step S2. By adopting the above technical means, when the source / load power fluctuates, the stable control of the bus voltage of the photovoltaic energy storage system and the reasonable distribution of power are realized, so that the photovoltaic energy storage system operates safely and stably.

The crawler-type photovoltaic power generation panel cleaning robot comprises a metal plate machine body, a machine body protection shell is installed on the outer surface of the metal plate machine body, rolling brush bodies are installed at the two ends of the metal plate machine body correspondingly, a crawler structure is installed at the bottom of the metal plate machine body, and a heat insulation cover is installed on the surface of the upper end of the metal plate machine body; and a signal receiving end, an antenna main body and an RTK receiving end are respectively mounted on the surface of the upper end of the heat shield. A belt wheel is driven by a brushless motor, the direction of the belt wheel is controlled through the differential control principle, plastic fiber brush heads are arranged at the front end and the rear end, dust is adsorbed by static electricity generated by high-speed friction, dust deposited on a photovoltaic power generation panel is cleaned in a mode of physically removing redundant sundries, and the device has the advantages of being high in automation degree and convenient to control. The whole device is flexible in steering control, high in maneuverability and high in dust removal and cleaning efficiency.

The invention relates to the technical field of train side door spraying and sealing, in particular to a polyurethane spraying device based on an automatic identification control principle, which is provided with a bearing platform, a visual identification assembly, a linear telescopic piece, a spray gun and a controller, the inclination angle of the linear telescopic piece is suitable for enabling the horizontal component velocity to be matched with the train traveling speed during stretching, the highest point of the telescopic end of the linear telescopic piece is suitable for being matched with the height of the upper edge of the side door, and the spray gun is installed at the telescopic end of the linear telescopic piece. During spraying, the whole device is placed on one side of the advancing direction of the train, and the controller controls the right spray gun to sequentially complete spraying of the upper edge and the right edge of the side door according to a detection signal of the visual recognition assembly and controls the left spray gun to sequentially complete spraying of the left edge and the lower edge of the side door. Spraying control of the device is achieved through cooperation of the visual recognition assembly and the controller, and the spraying difficulty is small; meanwhile, manual operation is not needed, and labor force is saved.

The invention discloses an underground conveyor stepless speed regulation control method realized based on a fuzzy control principle. The method comprises the following steps: step 1, realizing dialogue control among three machines through an Internet of Things technology; step 2, realizing dynamic optimization of the front transporter through a fuzzy control principle; 3, speed adjustment of the reversed loader is achieved through operation conditions of a front conveyor, a rear conveyor and a coal mining machine, and the three-loader cooperative control module is used for collecting operation data of the coal mining machine, a hydraulic support and the conveyors and controlling the operation data of the coal mining machine, the hydraulic support and the conveyors; the reversed loader speed adjusting module is used for adjusting the speed of the reversed loader according to the front and rear conveyors and the working condition information; the fuzzy rule base and reasoning module is used for reasoning a fuzzy value of the current coal quantity load through a fuzzy rule in combination with a membership degree of an input variable; the invention has the characteristics of high energy utilization efficiency and capability of effectively reducing invalid wear in equipment operation.

The invention relates to a model prediction control method and device for dynamically adjusting a prediction range. The method comprises the following steps: performing one-beat delay compensation on a motor system according to sampled data, and adjusting a prediction range of the one-beat delay compensation according to an actual switching frequency of the motor system at the current moment and a preset target switching frequency; calculating a reference voltage vector of the motor system based on a current dead-beat control principle, and performing space vector modulation on the reference voltage vector based on a volt-second balance principle to obtain a plurality of candidate voltage vector sequences; and selecting the candidate voltage vector sequence with the minimum harmonic current effective value as an optimal voltage vector sequence, and controlling the action of the motor system at the future moment according to the optimal voltage vector sequence. According to the method provided by the invention, the current harmonic is relatively small by adjusting the prediction range, limiting the switching frequency and screening the voltage vector sequence, so that the steady-state performance of the motor system is improved.

The invention discloses a multi-point distributed optical storage cooperative control method and device and a storage medium, and relates to the technical field of optical storage cooperative control, and the method comprises the steps: building an active anti-interference control model based on a virtual synchronous generator control principle according to the device parameters of each distributed optical storage system; constructing a voltage cooperative control model based on the Ressel invariance theorem; constructing an energy storage cooperative control model based on the energy storage charge state time sequence dependency relationship; a state space sharing strategy is utilized to associate the voltage cooperative control model and the energy storage cooperative control model to construct a cooperative control model; outputting an active disturbance rejection control strategy based on the active disturbance rejection control model; based on the disturbance elimination result, judging whether to call a cooperative control model to output a cooperative control strategy according to the power grid real-time operation data; and executing distributed optical storage control according to the active disturbance rejection control strategy or / and the cooperative control strategy. The method has the beneficial effect that the stability and adaptability of cooperative control of the distributed optical storage system are improved.

The application relates to a safe and stable control power distribution method and device of a two-end modified three-end parallel DC line. In the safe and stable control power distribution process of the two-end modified three-end parallel DC line, the power sending and receiving mode of the three-end converter station is determined according to the power sending capacity of the newly-added sending-end converter station and the power consumption capacity of the original two-end converter station, and the power coordination control principle and the power distribution implementation method of the power promotion and reduction function actions of each station in the power sending and receiving mode of 'one-end power sending and two-end power receiving' and 'two-end power sending and one-end power receiving' are respectively designed, so that the power distribution of the two receiving ends in the 'one-end power sending and two-end power receiving' mode can preferentially meet the power receiving of the original two-end converter station inverter station, and the power distribution of the two sending ends in the 'two-end power sending and one-end power receiving' mode can preferentially meet the power sending of the newly-built station, and the efficiency and accuracy of the power distribution of the parallel three-end DC project are improved.

The utility model discloses a compression device for an undercarriage buffer of an unmanned aerial vehicle, which relates to the technical field of unmanned aerial vehicles and comprises a pair of top fixing force arms, a pair of bottom fixing force arms and a pair of bottom fixing force arms, one end of each bottom fixing force arm is connected with the lower end of the buffer; the telescopic pull rod is arranged between the pair of top fixed force arms and the pair of bottom fixed force arms; the jack is arranged between the other ends of the pair of top fixed force arms and the other ends of the pair of bottom fixed force arms, and when the jack extends, one ends of the pair of top fixed force arms and one ends of the pair of bottom fixed force arms move oppositely; the compression device conforms to the mechanical control principle, and is easy and convenient to operate, reliable in function, stable in quality, lighter in weight, smaller in size, higher in portability and more flexible in application scene.