136 results about "Preventive control" patented technology

The invention discloses an underwater double-arm cooperating grabbing, holding and collision preventing integrated method and system, and belongs to the field of underwater operation automatic control. Based on the original task trajectory planning of double-arm cooperative work, it is put forward that three areas different in collision probability are divided on the basis of the work space of double mechanical arms, trajectory planning is preferentially carried out on the area low in collision probability, when it is necessary to pass through the area high in collision probability, the trajectory is divided into multiple small-section paths through an interpolation method, and collision judgment and collision preventing planning are carried out before the motion of each small section is executed; the motion of the small-section paths is updated according to collision preventing planning, and therefore collision risks are subjected to preventive control on the premise of not interfering with normal execution of original tasks. According to the method and system, preventive motion collision prevention of the mechanical arms can be carried out while the operation trajectory is planned; and according to the integrated method, underwater mechanical arm collaborative operation and motion collision prevention are unified, and certain practical value and development potential are achieved.

The invention relates to a high-reliability burglary-preventive control mechanism for an automobile door lock, which comprises a lock shell and further comprises a motor, a worm, a worm gear, a spring, a swing rod, a manual security locking / unlocking pull rod, an unlocking pull rod, a pull rod return spring, a transitional pull rod, a pawl, a pawl return spring and a bolt, which are mounted in the lock shell. The worm is mounted on a motor shaft, a worm gear shaft is perpendicular to the motor shaft, a swing rod shaft is parallel to the worm gear shaft, the worm gear is provided with a groove in a special geometrical shape and capable of pushing a cylindrical boss at the top of the swing rod to push the swing rod to swing, positioning of the swing rod is realized through a slide on the lock shell, and an eccentric spring is mounted on the swing rod. The manual security locking / unlocking pull rod is mounted on the swing rod shaft, a clamping groove of the manual security locking / unlocking pull rod clamps a cylindrical boss at the tail end of the swing rod, the unlocking pull rod is connected with the pawl through the transitional pull rod, and the swing rod can swing to drive the transitional draw rod to rotate around a hinge on the pawl to be separated from the unlocking pull rod, so that the unlocking pull rod cannot unlock, and security is realized. The cam shaped groove on the worm gear is symmetrical, the worm gear only needs to rotate by 180 degrees to complete security locking / unlocking actions, and the high-reliability burglary-preventive control mechanism is high in transmission efficiency.

The invention discloses an on-line platform-based power grid accident pre-arranged plan automatic realization method which comprises the following steps: a forecast trend of a power grid is obtained; an anticipated accident set is established; emergency control aid decisions and control objects and post-accident power grid preventive control aid decisions and control objects for the anticipated accident set are generated; an accident pre-arranged plan is generated and is chosen as a matching pre-arranged plan, and therefore a power grid accident pre-arranged plan is realized. According to the on-line platform-based power grid accident pre-arranged plan automatic realization method provided in the invention, based on an on-line safety and stability analyzing system, complete power grid accident pre-arranged plan automatic realization processes are designed via strict trend prediction, scientific accident anticipation and fault surface search, and mature operation analysis check and control aid decisions; a function mechanism via which power grid accident pre-arranged plans can be automatically edited, the pre-arranged plans can be instantly popped out when accidents occur and safety monitoring of whole processes can be realized is established; improvement and high-efficiency application of pre-arranged plan quality are facilitated, and labor intensity and accident processing risk of dispatchers are lowered.

The invention relates to a prevention, control and fault handling method and system for a power distribution network. The prevention, control and fault handling system for the power distribution network comprises a uniform-control platform, an information acquisition unit and a prevention and control unit, wherein one end of the uniform-control platform is connected with the information acquisition unit, the other end of the uniform-control platform is connected with the prevention and control unit, the prevention and control unit is used for predicting the abnormal operating state of devices in the power distribution network in a short period of time in future, and the prevention and control unit comprises a second index calculation module used for setting an index in advance according to the information of the devices in the power distribution network and the information of a network topology and storing the information of the topology so that data support can be provided for a fault handling unit. The prevention, control and fault handling method and system for the power distribution network have the advantages that the practicability is high, threshold crossing can not occur easily in a short period of time, time of prevention and control handing is effectively saved, energy is saved, and the probability of occurrence of faults is lowered.

In a vehicle dynamics control apparatus enabling vehicle dynamics control and lane deviation prevention control, a processor of a control unit is programmed for determining a driving stability including a vehicle driveability and a vehicle stability, based on at least a steer angle, and for executing the vehicle dynamics control by producing a yaw moment corresponding to a controlled variable of the vehicle dynamics control when the driving stability is deteriorated, and for executing the lane deviation prevention control by producing a yaw moment corresponding to a controlled variable of the lane deviation prevention control when there is a possibility of lane deviation. The processor is further programmed for softening a criterion, which is used to determine the driving stability, based on the controlled variable of the lane deviation prevention control, only when the vehicle dynamics control is inoperative.

The invention discloses a hybrid control method of an electrical-gas interconnection integrated energy system. The hybrid control method comprises the following steps of 1) building an electrical-gasinterconnection integrated energy system optimization model according to slow dynamic characteristic of natural gas and pipe storage; 2) building prevention and control optimization dispatching modelof the electrical-gas interconnection integrated energy system by considering a key fault in an anticipated fault set; 3) building an after-fault correction control module by considering other faultsexcept for the key fault set in the anticipated fault set according to a prevention and control strategy; 4) building a hybrid control framework of the electrical-gas interconnection integrated energysystem by combining a prevention and control model and the correction control module; and 5) testing performance of the hybrid control method in the integrated energy system. With the method providedby the invention, the calculation efficiency is effectively improved, and the fault control strategy of the electrical-gas interconnection integrated energy system can be more accurately customized.

The invention discloses an electric power system protection and control method based on a risk assessment. The method comprises the following steps: carrying out the risk assessment on an electric power system, and calculating power network risk values; establishing a protection and control object function; inputting electric power system running states and parameters; and according to the protection and control object function and the power network risk values, formulating electric power system protection and control measures. According to the invention, risk theories are applied to the protection and control of the electric power system, the problem of formulating protection and control measured by reliance on experience of dispatchers is solved, and quantifiable measures can be obtained by use of the method so as to effectively realize safety protection and control of the electric power system. Besides, the method, on the basis of the risk assessment, takes control cost into consideration in an integrated approach, draws up the protection and control object function and formulates the quantifiable protection and control measures according to the object function so as to reduce the control cost as much as possible under the condition that safety protection of the electric power network is realized.

The invention discloses a carbon monoxide poisoning preventive control system for an idling automobile, which comprises a carbon monoxide concentration detection unit, an interior personnel infrared detection unit, a signal processing unit, a first relay, a second relay, a third relay, a fourth relay, an alarm lamp, a buzzer, an automobile horn switch, a window ascending button, a window descending button and an automobile ignition switch. The carbon monoxide concentration detection unit and the interior personnel infrared detection unit are connected with the signal processing unit through wires, and the signal processing unit is connected with the alarm lamp and the buzzer through wires and further connected with a signal source port of each of the first relay, the second relay, the third relay and the fourth relay through a wire. Two wiring ports of a normally-open switch of each of the first relay, the second relay, the third relay and the fourth relay are in parallel connection with the automobile horn switch, the window ascending button and the window descending button through wires, and the two wiring ports of the normally-open switch of the fourth relay are serially connected with the automobile ignition switch through a wire.

A projection apparatus includes: a projection system which projects an image; a vibration detecting unit which detects vibration given to the main body of the apparatus; an installation condition determining unit which determines the installation condition of the main body of the apparatus; and an image blur preventive control unit which performs image blur preventive control for preventing blurring of the image caused by the vibration detected by the vibration detecting unit based on the vibration, wherein the image blur preventive control unit performs the image blur preventive control in accordance with the installation condition determined by the installation condition determining unit.

The invention discloses an auxiliary decision-making method and device for transient stability prevention and control and electronic equipment. The method and the device are applied to transient stability prevention and control decision of a power system. The method comprises steps of based on anticipated fault transient stability evaluation calculation of a current operation mode, calculating a control measure control performance index of the transient instability fault and screening effective control measures; forming a plurality of control measure schemes meeting the control precision requirement according to the control measure performance index sorting result; and enumerating and combining the control measure schemes of different transient instability faults, carrying out transient stability prediction on the combined scheme by adopting a fault transient stability classification prediction model, and selecting the scheme which meets the transient stability requirement and has theminimum control cost as a prevention and control auxiliary decision control measure suggestion. According to the method, the online intelligent auxiliary decision of transient stability prevention andcontrol of the power system is realized, and the requirements of calculation speed and accuracy can be met.

The invention relates to an extra-high-voltage DC multi-infeed system commutation failure prevention and control method and system. After an AC system breaks down, commutation failure prevention and control of an inverter valve group which is close to an AC fault point in electrical distance is greatly triggered in advance, and therefore, commutation failure of an inverter valve group which is faraway from the AC fault point in electrical distance is possibly caused. According to the application, a coordinated control mode is adopted, and commutation failure prevention coordinated control output of the inverter valve group in the area near the fault is adaptively adjusted according to the turn-off angle drop value of the inverter valve group in the area away from the fault, so that commutation failure of the inverter valve group in the area away from the fault is avoided.

The invention provides a power system transient stability multi-fault constraint preventing control method. According to the method, a buckling failure is decoupled through expected fault position topology analysis; a multi-fault adjusting timing sequence is set according to fault severity, and a multi-fault constraint preventing control problem is reduced in a dimensional aspect into a multiple single fault stability control decision problem; finally, a preventing control adjusting strategy capable of meeting requirements of all transient stability constraints is obtained. According to the method, in the adjusting process, the economic type of prevention control is considered, a corresponding adjusting gear is distributed for the power adjusting space of each fault, and a strategy, smallest in adjustment, meeting the requirements of operation modes of multiple fault constraints is confirmed through a parallel calculating mode.

The invention relates to the technical field of electric power, particularly relates to an active and passive frequency response switching control method, and specifically a frequency response controlmethod in a high-power deficiency fault. According to the method, for a two-regional power grid, a number line is adopted for representing an inter-region call wire, and an imaginary line is adoptedfor representing a communication line; A region is a disturbed region and a B region is a non-disturbed region; firstly, a unit thermal power generating unit mathematical model is established; and 2,an interconnected power grid mathematical model is established. By adoption of the method, frequency response is changed from dispersed autonomous control into concentrated coordination control, fromfeedback control into feedforward control, and from correction control to preventive control, and the overall frequency responsiveness of the system is improved under the premise of not increasing frequency response facility, thereby improving frequency stability defense capability under high disturbance; and frequency decline can be stopped effectively in a high disturbance frequency decline stage, system low frequency load shedding can be avoided, the system can be recovered to be stable in a frequency recovery stage as soon as possible, and frequency oscillation in the active control process of the system can be avoided.

A data driving method for dynamic safety assessment of an electric power system comprises the following steps: 1), obtaining operation data of the electric power system, constructing corresponding dynamic safety indexes, and constructing an initial sample set containing an operation data set and the dynamic safety indexes; 2) processing the initial sample set to achieve the purposes of data compression and dimension reduction, and generating an efficient sample set; 3) obtaining a dynamic safety assessment model; 4), obtaining a near-real-time updating sample set, and completing the updating of the dynamic safety evaluation model; and 5) completing evaluation of the real-time dynamic safety state of the power system to obtain a real-time dynamic safety evaluation result. The invention aimsto provide the dynamic safety assessment method which is beneficial to improving the assessment speed and the prediction precision, is beneficial to system operation personnel to take prevention andcontrol measures in time, and improves the operation stability and the power supply reliability of a power system.

A vehicle 1 has a torque coupling 8, which is located in a driving power transmission system for transmitting the torque of an engine 2 to front and rear wheels 13f, 13r. The torque coupling 8 changes the torque distribution by adjusting the frictional engaging force of an electromagnetic clutch 16. The vehicle 1 also has a 4WD ECU 21 (CPU), which controls the operation of the torque coupling 8 based on the driving state. The 4WD ECU 21 (CPU) estimates a transfer case oil temperature Tptu. When the transfer case oil temperature Tptu is higher than or equal to a first predetermined transfer case oil temperature KTptu1, the 4WD ECU 21 executes overheat prevention control. When the deviation ΔA between an estimated vehicle acceleration Ae, which is computed based on a predetermined vehicle weight M and a driveline torque τd of the engine 2, and the actual vehicle acceleration Av is greater than or equal to a first predetermined deviation KΔA1, the 4WD ECU 21 (CPU) estimates the transfer case oil temperature Tptu to be higher. This allows the control mode of the torque coupling 8 to be smoothly switched to the overheat prevention control.

The invention relates to a multi-dimensional voltage deviation index method based on the statistic analysis of the historical information of a power grid. The method comprises the following steps of: preprocessing voltage information: acquiring the station voltage information including time attributes, space attributes and equipment set attributes in an undetermined time interval from a database; calculating an early warning median value: reading the upper limit and the lower limit of a voltage early warning value, and calculating a median of the voltage early warning value so as to enable voltage deviation indexes (VDI) to have the capability of out-of-limit early warning; and carrying out sorting calculation on multi-dimensional voltage deviation indexes: carrying out statistic analysis and calculation on voltage data within a period of time T to obtain important voltage indexes VDI of a single station and the power grid. According to the invention, a VDI curve is drawn according to statistic calculation results, a reference basis is provided for the regulation of the voltage, the regulation of a reactive power control strategy and the basis planning, configuration and switching of reactive-load compensation equipment so as to assist a dispatcher in learning the current running health degree and the variation trend of the power grid, and a reliable auxiliary strategy can be provided for the running mode adjustment and the risk preventive control of the power grid .

The invention belongs to the technical field of air conditioner control, and discloses an air conditioner using fresh air and a control method. A fresh air machine continuously operates for X time, fresh air anti-condensation detection and judgment are conducted, the lowest operation time is not met, the fresh air machine does not detect a fresh air anti-condensation control program, and operationcontinues according to the current state; the fresh air machine meets the running time X, and the difference between the current dew point and the fresh air temperature is judged according to the indoor environment parameters and the fresh air outlet temperature; whether a fresh air anti-condensation control program is met or not is judged; each parameter meets the fresh air anti-condensation requirement, and the fresh air load adjusts each load state of the fresh air according to the fresh air temperature difference value; after each load state of the fresh air is adjusted, the fresh air outlet temperature time is higher than the dew point temperature value X1 time, and each load of the fresh air is adjusted to operate in an initial state. Similar materials such as sponge and flanneletteare not added, personnel operations are reduced, prevention and control measures are taken on the product reliability, and therefore, reliable operation of the air conditioner is ensured.

A capsular device for esthetic and therapeutic treatment, but particular involves a device for body treatment that allows emission of infrared together with negative ions, allowing easy elimination of toxins, heavy metals, preventive control of some diseases and postsurgical therapeutic treatment; said capsular device has a fixed structure equipped with a rail on which a perpendicular mobile chamber is mounted, which is made up of an individual base configured by seat and back, said base having protective side arms and articulated cover with control panel with computer screen and screen with images of the patient, which enable constant follow-up of measurement variations.

A focus adjustment apparatus recaptures an object even if the object goes out of a view angle during imaging. The apparatus performs a zoom control of detecting a movement condition of a camera and automatically shifts a zoom position to a wide angle side or a telephoto side on the basis of the movement condition. The zoom position and a focus position before the zoom position is shifted to the wide angle side are stored. A focal point adjustment is performed to bring the object into focus by moving a focus lens to a target position. When the zoom position is moved to the telephoto side, the stored zoom position is used as the target position. When the zoom position is being shifted to the wide angle side, the object is brought into focus by moving the focus lens and the stored focus position is used as the target position.

A thunderbolt loss prevention and control method based on probability early warning aims to predict the thunderbolt probability under the thunder and lightning climate condition and reasonably adjust the power transmitted on important power transmission channels with high transmission capacity and close line arrangement so as to avoid economic loss generated after a connecting line is thunder and lightning. According to the method, firstly, a Bayesian network is used for carrying out thunderbolt probability early warning on a power transmission line, then lightning stroke risks are quantified into economic losses, the economic losses and regulation and control costs are combined into risk costs, and the minimum risk costs are used as an objective function to determine the specific amount of adjustment power. According to the invention, a balance point can be found between regulation and control cost and direct loss, and the cost of active lightning protection in a regulation and control mode is effectively reduced.

The invention relates to the field of electric power technology, in particular to an active and passive frequency response compound control method, in particular to a frequency response control methodunder large disturbances. The method of the invention includes the steps of first, establishing a mathematical model of a unit thermal power unit, and second, establishing a mathematical model of aninterconnected power grid. The method of the invention realizes the change of frequency response from decentralized control to centralized control, from feedback control to feedforward control, and from correction control to preventive control, and can improve the overall frequency response capability of the system without increasing frequency response facilities, thereby improving the frequency stability and resistance under large disturbances. The method can also coordinate the global and local control objectives, and can not only avoid the low-frequency load shedding of the system under large disturbances, but also make the system restore stability quickly, thereby avoiding the frequency oscillation in the active control process.

The invention relates to a 500-220kV regional power grid automatic voltage control method based on voltage trend prediction, and belongs to the technical field of power system automatic voltage control. The method comprises the following steps: when each automatic voltage control period arrives, reading in and obtaining ultra-short-term load prediction of each 220kV transformer substation at the lower level of the 500-220kV regional power grid, and calculating the trend of the 500-220kV regional power grid in the future and the fluctuation amplitude of the voltage value of the 220kV bus in the500-220kV regional power grid according to the ultra-short-term load prediction; further calculating the voltage safety threshold value of the 220kV bus in the 500-220kV regional power grid accordingto the fluctuation amplitude of the voltage value, and inputting the voltage safety threshold value into an automatic voltage control system to realize prevention and control. By adopting the method,220kV bus voltage out-of-limit caused by a subordinate 220kV transformer station of a 500-220kV regional power grid in the future load change process can be prevented and controlled, and the safety and stability of the power grid are improved.

The invention discloses a prevention and control method considering the control mode of an IPFC. Various control modes of the IPFC are considered, and power system power flow calculation including a main control mode and an auxiliary control mode is performed by utilizing the power flow calculation iteration format under each control mode of the IPFC; a multi-objective optimization function integrating practicability and safety is constructed, and operation constraints of the power system and the IPFC are provided; and prevention and control power flow optimization of the power system is realized based on a particle swarm optimization algorithm. According to the invention, the static control potential of the IPFC can be fully mined, the optimization of power flow distribution during steady-state operation of the system is realized, and the practicability and the static safety level of the system are significantly improved.

A preventive cabin temperature controlling method based on real-time power of a fan unit belongs to the technical field of wind power. The invention relates to a wind generating set temperature control system, in particular to a nonlinear wind power generator temperature control system. According to the real-time power of a fan, processing is carried out through an algorithm, so that a heat dissipation curve is moved outwards, the heat dissipation power is increased, the residual amount is reserved after the temperature is adjusted, the hysteresis is eliminated, and the nonlinear and preventive control on the temperature of a cabin is realized. According to the preventive cabin temperature controlling method, the output power of the temperature control system is calculated and determined according to the real-time power and the rotating speed torque table of a wind turbine generator so as to control the temperature control system. The temperature adjusting capability is better while the output power of the temperature control system is larger as the real-time power of the wind turbine generator increases. As the slope of the power curve of the wind turbine generator becomes larger,namely, the power corresponding to the next rotating speed becomes larger, the output power of the temperature control system becomes larger, and the temperature adjusting capability is better.

The invention discloses a control method of thick plate rolling warping and bending. The control method comprises the steps that a large data analysis is carried out on rolling variety specifications,passes, reduction, upper and lower surface calculation temperatures and the occurrence time and characteristics of warping and bending through warping and bending detection device data to obtain thewarping and bending occurrence rule related to the rolling variety specifications; the preventive intervention is carried out in advance before the occurrence of warping and bending in control, so that the occurrence probability of the rolling warping and bending and the influence on production are reduced; and the effect generated after the intervention is measured and fed back to a computer again, the rule is calculated again, and the measures are circularly improved. The thick plate rolling production line can realize systematic analysis and preventive control on the rolling warping and bending, wherein the preventive control belongs to feed-forward type pre-control based on data accumulation, and can be circularly improved. The method summarizes the rule of the warping and bending, andcan effectively reduce the occurrence probability of the warping and bending in large-scale production.

The invention discloses an engine overspeed preventive control system, and relates to the technical field of heavy engineering equipment. The engine overspeed preventive control system comprises an overspeed preventive valve group, a closed plunger pump, an engine and a hydraulic motor. The overspeed preventive valve group comprises an oil port B2, an oil port B1, an oil port A2 and an oil port A1; the oil port B1 and the oil port B2 can be communicated with each other in the overspeed preventive valve group; the oil port A1 and the oil port A2 can be communicated with each other in the overspeed preventive valve group; an oil port B of the closed plunger pump can be communicated with the oil port B1, and an oil port A of the closed plunger pump can be communicated with the oil port A1; anoutput shaft of the engine is connected with the closed plunger pump; an output shaft of the hydraulic motor is connected with a speed reducer. The engine overspeed preventive control system has thetechnical advantages that the engine can be prevented from being damaged due to overspeed, the heat productivity of the engine overspeed preventive control system can be reduced, and the speeds can bemanually increased on the premises of long slope descending and non-overspeed engines.

The invention discloses an electric vehicle charging device base gangway. The electric vehicle charging device base gangway comprises a main body unit, an initial prestressed tension adjusting unit, ahighest prestressed tension adjusting unit and a maximum movement range adjusting unit, the main body unit is composed of a gangway hook, a gangway lug, a gangway support and an adjusting screw rod,the initial prestressed tension adjusting unit is composed of elastic force of the prefabricated radian of the gangway hook and the adjusting screw rod, the highest prestressed tension adjusting unitis composed of a gangway lug upper limit point and an adjusting screw rod center line position, and the maximum movement range adjusting unit is composed of a gangway lug starting acting point, a gangway hook starting position and a gangway hook position stopping acting point. According to the electric vehicle charging device base gangway, standard quality control in batch production, installation, debugging and use of a whole gangway part and a part is effectively realized, and prevention and control of loosening and separation of batch bases and a ground are further realized.

The invention relates to the technical field of power system automation, and aims to provide a transient stability prevention and control method for a power system embedded with a deep belief network.The method comprises the following steps: S1, determining an active output fluctuation range and a load fluctuation range of a generator, generating N generator active output samples, obtaining a large amount of initial state data, and performing time domain simulation calculation on the initial state data to generate sample data; S2, establishing the deep belief network, training the deep beliefnetwork by using the sample data, and fitting the active power output of the generator and the transient stability of the system to generate a transient stability evaluator of the power system; S3, adding a cost constraint, a power flow constraint and a stable operation constraint to the NSGA-II algorithm based on a transient stability constraint condition, and building an NSGA-II evolutionary algorithm model; and S4, obtaining a generator output fluctuation range and a load fluctuation range of transient instability under a fault, performing iterative optimization on the NSGA-II evolutionaryalgorithm model and solving a prevention and control strategy.

The invention provides a system for preventing overheating of a DPF device. The system comprises an oil consumption metering value, a timer, a mileage calculator, an optimization prevention controller, a basic prevention controller and a master control unit. The optimization prevention controller is configured to be used for calculating an oil consumption factor, an engine operation duration factor and a vehicle driving mileage factor and setting the maximum factor as a maximum optimization factor. The basic prevention controller is configured to be used for obtaining a carbon loading factor. The master control unit configured to be used for setting the larger one of the maximum optimization factor and the carbon loading factor as a prevention factor when an optimization prevention module is started being used or setting the carbon loading factor as the prevention factor when the module is forbidden; and the prevention factor is compared with a factor upper limit and a factor lower limit, an engine torque limiting function is triggered when the prevention factor exceeds the factor upper limit, the function is forbidden when the prevention factor is equal to or smaller than the factor lower limit, and the triggering state of the function is kept unchanged when the prevention factor is between the factor upper limit and the factor lower limit. The invention further discloses a method using the system.