53results about How to "Low communication requirements" patented technology

The invention is applicable to the field of mobile communication, and provides an SMS communication method, a device and a mobile terminal; the method comprises the following steps: receiving an SMS which contains the image facial expression picture identifier of a user on a sending end and a text message; obtaining an image facial expression picture of the user on the sending end which corresponds to the facial expression picture identifier of the user on the sending end; according to a voice message of a voice sample of the user on the sending end, converting the text message in the SMS into the voice message; and displaying the facial expression picture of the user on the sending end, and displaying the converted voice message. When in SMS communication, the invention displays the image facial expression picture of the user on the sending end through the increased SMS, converts the text message of the SMS into the voice message and plays the same, vividly expresses the facial expression and the tone of the user on the sending end, realizes the effect of virtual video conversion with lower cost and lower communication requirements, so that the user obtains the experience of video conversation.

The invention discloses an intelligent express way vehicle sensing and streetlamp control method based on a wireless multi-hop ad-hoc network, and the method comprises the steps such as establishment and maintenance of the network, multi-hop transmission of vehicle sensed information and on-off control of a streetlamp. The establishment and maintenance step of the network comprises the following steps that a road side unit (RSU) periodically transmits an own identifier, and each RSU is added to an RSU identifier list according to the received signal threshold value of the RSU identifier and starts or re-starts a timer so as to generate and maintain a neighbor road side unit list. The multi-hop transmission of the vehicle sensed information and the on-off control of the streetlamp comprises the following steps that an on-board unit (OBU) periodically broadcasts own identifier, the RUS receives and forwards / abandons the OBU identifier according to a rule and generates and maintains an OBU identifier list, and the streetlamp is turned on or turned off according to the received content and the list content. The method is combined with corresponding hardware platform, so that requirements of express way operators on the intelligent sensing of vehicles and real-time and robust intelligent control of the streetlamp can be met.

The invention proposes a chaos grey wolf optimization-based unmanned aerial vehicle formation control method. A distributed model predictive control (MPC) frame of unmanned aerial vehicle formation control is built, each unmanned aerial vehicle only shares information with a neighbor, and the communication requirement and the computational complexity are reduced; a chaos optimization algorithm iscombined with a grey wolf optimization algorithm, and thus, the algorithm performance is improved; and the algorithm is combined with the distributed MPC, finite horizon optimal control problem (FHOCP) is solved, so that unmanned aerial vehicle formation control is achieved.

The invention provides an active power distribution network multi-terminal fault identification method and system based on transient signals. The method comprises the following steps: firstly, transient voltage being adopted to construct a protection starting criterion; comparing the integral average value of the zero-mode voltage in the protection time window with a zero-mode setting threshold value, judging whether a grounding fault occurs or not, comparing the integral average value of the transient voltage of each phase after the zero-mode component is filtered out in the protection time window with a set threshold value, and identifying a fault phase; then, according to the fault phase and the fault type, selecting a corresponding transient signal to perform windowed Fourier transform, extracting the voltage and current of a corresponding characteristic frequency band, calculating the transient impedance under the required characteristic frequency band, and judging the fault direction by comparing the root-mean-square value of the transient impedance with the protection setting impedance value; and finally, the fault position being judged through the multi-terminal fault direction information. The method disclosed by the invention is basically not influenced by factors such as transition resistance, DG permeability, network operation state and the like, has relatively lowrequirements on communication conditions, and can realize fault identification and comprehensive protection of the active power distribution network.

The invention provides an error compensation method for measuring film thickness of a wafer of a wafer stage. The error compensation method comprises the following steps of: measuring system errors; controlling a lifting cylinder to lift so as to receive the wafer, and starting a sucker to suck the wafer; controlling the lifting cylinder to lower; controlling a motor to rotate so as to detect the notch of the wafer, and establishing a wafer polar coordinate system according to the notch of the wafer; controlling the motor to stop after establishing the wafer polar coordinate system, returning to the notch of the wafer, controlling the sucker to unload the wafer, and controlling the lifting cylinder to lift; controlling the motor to rotate so as to detect a zero site of the motor, and establishing a motor polar coordinate system according to the zero site of the motor; controlling the motor to stop, returning to the zero site of the motor, controlling the sucker to suck the wafer and controlling the lifting cylinder to lower; and measuring the wafer by means of a wafer measuring system so as to acquire an initial film thickness value, and compensating the initial film thickness value according to the system errors. According to the error compensation method, the errors of the measured film thickness of the wafer can be compensated, and more accurate film thickness of the wafer can be acquired.

The invention discloses a double-end direct-current power distribution network distributed region protection method based on a current differential state quantity. Firstly, a medium-voltage direct-current bus is used as a boundary to carry out region division on a medium-voltage direct-current line; direct-current voltage and current amplitudes are used as fault characteristic quantities of protection starting, state word definition is carried out on a fault current differential quantity, fault type judgment and region fault positioning are carried out by utilizing the distribution condition of fault current state words, and direct-current circuit breakers at the two ends of a fault region are rapidly disconnected. Only information communication of adjacent sensors is needed, communicationdata are few, the transmission distance is short, faults can be rapidly removed when single-pole short circuit and double-pole short circuit happen to a direct-current line, the applicability is high, and the method can be used for a double-end or multi-end direct-current power distribution network in various operation modes.

The invention provides a model training method and device based on a federal learning system. The method comprises the following steps: acquiring first model parameters of a first sub-model corresponding to at least two model training labels and second model parameters of a second sub-model corresponding to the at least two model training labels; obtaining a label meaning of each model training label, and determining an association relationship between the at least two model training labels based on the label meaning; performing parameter aggregation on the at least two first model parameters and the second model parameters based on an association relationship between the at least two model training labels to obtain global model parameters; and distributing the global model parameter to each first participant device and the second participant device, so that the first participant device and the second participant device update the model parameter of the local model based on the global model parameter. Through the method and the device, the data security can be ensured, and the prediction accuracy of the model is improved.

The invention discloses a line fault region identification method. The line fault region identification method comprises the following steps of calculating equivalent impedance Zeq of a T region; calculating current T region transfer functions on the non-fault side and the fault side of the T region when a line suffers from a fault, then obtaining an amplitude-frequency characteristic curve, and thereby determining the number J of layers of wavelet transform corresponding to a reduced frequency band; giving an initial value to a fault region judgment start setting value delta set1, wherein themaximum value of T region fault standard energy difference is delta EJset; measuring and working out line mode currents IL and IR; judging whether the fault region judgment protection needs action ornot; measuring and working out T region standard energy difference delta EJ; and by judging the relation between the standard energy difference delta EJ and the maximum value delta EJset, and then judging a fault region. According to the method, the difference of the fault transient state current energy on the two sides of the T region are extracted through wavelet transform according to the cutting-down effect to the low-frequency component in the fault transient state current energy by the T region, and quick and reliable identification of a fault position can be realized, so that fault region judgment is further realized by integrating fault direction position of each T region.

The invention provides a ship MMC-MVDC rapid fault protection method based on transient current characteristics, and the method comprises the steps that ship MMC-MVDC fault characteristic analysis which comprises fault moment MMC fault current characteristic analysis and fault current characteristic analysis under a multi-region power distribution topological structure is performed; a sample database of fault current information is established; after a fault starting criterion is met, transient current information is sampled, sudden change point detection is carried out on the sampled currentinformation, and abnormal values are removed; the correlation degree of the sampling current information and the fault current information in the sample database is calculated by adopting an improvedcosine similarity algorithm so as to complete fault detection, and an approximate fault transition resistance range is speculated according to the fault current information with the maximum correlation degree in the sample database; according to the positivity and the negativity of the correlation degree of each line meeting the fault threshold, the fault instantaneous current direction is replaced to realize fault positioning. The ship MMC-MVDC fault detection method has the capability of resisting transition resistance, and can overcome the defects that the existing ship MMC-MVDC fault detection time is long, the detection algorithm is complex and the like.

The invention relates to an improved droop control method and device with bus voltage recovery. The method comprises the steps of (S1) measuring resistance information and correcting a droop coefficient on the basis of measured resistance information; (S2) collecting bus voltage of a common coupling point and obtaining voltage deviation correction amount; and (S3) controlling output voltage of a converter on the basis of the corrected droop coefficient and the obtained voltage deviation correction amount. Compared with the prior art, the improved droop control method and device have the advantages that the operation characteristics of a DC microgrid are fully utilized, the actively measured resistance is utilized and a voltage recovery unit is introduced, so that the disadvantages of traditional droop control are overcome.

The invention belongs to the technical field of bridge construction and particularly relates to a continuous beam cantilever casting secondary real-time counterweight system and a construction method. The device solves a problem that the manual uncertainty risk is large due to the fact that the unbalance deviation is kept within an allowable range through a method of manually commanding and controlling the concrete pouring variance in traditional continuous beam concrete pouring, and comprises a central water tank arranged in the center of a 0 # section, poured sections are arranged on the two sides of the 0 # section, and hanging baskets are installed on the poured sections; a hanging basket refitting part capable of moving forwards along with the hanging basket is installed on the hanging basket, to-be-poured section water tanks are installed on the left side and the right side of the hanging basket refitting part correspondingly, and the central water tank supplies water to the to-be-poured section water tanks; an adjustable laser emitting device II and an adjustable laser emitting device I are installed at the end, close to the to-be-poured section, of the poured section, a double-sided photosensitive induction device is arranged in the center of the 0 # section, and pressure sensors are arranged between the bottoms of the hanging basket longitudinal beams on the two sides and the poured beam section.

The invention relates to an energy storage type offshore wind farm flexible direct current power transmission system. The system comprises a wind turbine generator, a fan side transformer, an offshore confluence booster station, an offshore converter station and an onshore converter station which are electrically connected in sequence; the offshore converter station is internally provided with a fault detection module and an offshore fault ride-through module. A land fault ride-through module is arranged in the land converter station; and an energy storage module and an energy storage control module are arranged in the offshore confluence booster station.

The invention discloses a remote engineering and geological disaster safety monitoring system based on an unmanned aerial vehicle and a method thereof. The system comprises data acquisition units, a wireless communication management unit, an unmanned aerial vehicle and a wireless data acquisition unit, wherein the data acquisition unit acquires monitoring data; the wireless communication management unit reads monitoring data from each data acquisition unit and stores the monitoring data; when the unmanned aerial vehicle flies to an engineering destination with the wireless data acquisition unit, the power supply of the wireless data acquisition unit is turned on, and a communication link command is sent to the wireless communication management unit; after the communication link is established, the wireless data acquisition unit receives monitoring data sent by the wireless communication management unit, and when the monitoring data are received, the communication link is disconnected,and the wireless data acquisition unit power supply is disconnected by the unmanned aerial vehicle. Based on the unmanned aerial vehicle, the wireless data acquisition unit, a low-power consumption data acquisition unit, the wireless communication manager and the like, the automatic safety monitoring system with low equipment cost and low operation and maintenance cost is constructed, and the automatic safety monitoring system has the advantages of strong feasibility and good application prospect.

The invention discloses a self-organization power flow controlling method of a photovoltaic power generator set suitable for a power distribution network. The self-organization power flow controlling method comprises the following steps: the photovoltaic power generator set is controlled; each photovoltaic power generator of the power distribution network is controlled through underlying controlling volumes and communication matrixes; the communication matrixes of a partial communication network are optimized to be complete sequences; the photovoltaic power generator set of the power distribution network is controlled through high-level controlling volumes. According to the invention, a plurality of photovoltaic power generators of the power distribution network can be stable and efficiently controlled under the condition of limit communication ability; active power outputted by the photovoltaic power generators is close to a set value; a system composed of the photovoltaic power generators can be improved in anti-interference; the self-organization power flow controlling method has the characteristic of redundancy in the time-variety and instantaneity of the partial communication network, and the smallest communication bandwidth can be realized.

The invention discloses a multi-energy system line protection method based on waveform difference characteristics, and the method comprises the steps: measuring the currents at two sides of a protected line, calculating the positive sequence current fault components at two sides, extracting the initial peak values of the positive sequence current fault components at two sides and the correspondingmoments through a peak-valley detection operator, so as to judge the internal and external faults. The method ensures that the protection devices on the two sides of the protected line in the multi-energy system can quickly and accurately distinguish the faults inside and outside the region, is suitable for the multi-energy system with an annular structure and a radiation structure, has low communication requirements, is easy to set a protection threshold value, and has good selectivity and sensitivity.

The invention relates to an automatic network reconstruction implementation method for a power grid feeder line, which is used for limiting a station outlet breaking condition in a power grid feeder line automatic system, the breaking conditions of feeder terminal units and the divide-shut brake and locking condition of an interconnection switch to reconstruct a power grid feeder line automatic network. Compared with the prior art, the method has the advantages that the judgment of fault coverage is realized by comparing current signal data of upper and lower adjacent equipment through the feeder terminal units; only equipment on both sides of fault segments are removed, so that circuits in non-fault segments are prevented from suffering from power outage; each feeder terminal unit works independently, and fault handling actions are rapid, so that the defects of poor reliability, slow fault positioning and isolation and high communication requirements existing in the conventional automatic feeder line system are overcome; and the method is easy and rapid for implementing, can contribute to realizing in-situ intelligent judgment of divide-shut brake and one-time divide-shut brake network reconstruction, has no impact on a system and low communication requirements, and can be implemented through general public network communication.

The invention discloses a parameter-optimized alternating-current micro-grid energy storage SOC equalization control method, which is characterized in that a distributed multi-agent system (MAS) structure and a dynamic consistency algorithm are adopted, the condition that energy storage has different rated electric quantities and different initial SOCs is considered, a power calculation method for SOC mean value estimator by utilizing bus frequency, energy storage SOC and an intelligent agent is provided, and the power balance is realized while the power balance in the micro-grid is met. Meanwhile, linear iteration is accelerated by optimizing parameter selection, so that the total communication traffic required for realizing SOC equalization is reduced, and the pressure of a communication network is reduced.

The invention provides a multi-layer blockchain protocol expansion system and method based on a communication-device-oriented system, belongs to the technical field of blockchains. The system comprises a root blockchain, a plurality of side blockchains constructed on the root blockchain in a tree structure, and communication devices respectively connected with the root blockchain and the side blockchains. The invention aims to solve the problems that a blockchain expansion technology based on a trusted root blockchain is used for establishing a multi-layer blockchain expansion protocol oriented to the Internet of Things, and under the condition of ensuring the record security of communication equipment, the record change speed of the communication equipment on the root blockchain and the flexibility, autonomy and availability of the record change of the communication equipment are greatly expanded.

The invention discloses a two-dimensional code sound wave time-division and frequency-division payment system and a payment method thereof. At least one two-dimensional code sound wave payment device,that two-dimensional code sound wave payment device is communicatively connected with the payment system settlement platform for controlling the client to carry out two-dimensional code payment operation; and a client end for performing payment operation to a payment system settlement platform through the two-dimensional code sound wave payment device; at the time of payment, the two-dimensionalcode acoustic wave payment device divides time and frequency to transmit the acoustic wave signal of payment feedback to the corresponding client. The invention discloses a two-dimensional code acoustic wave time-division frequency-division payment system and a payment method thereof. The two-dimensional code acoustic wave frequency-division time-division communication can effectively solve mutualinterference between acoustic wave communications, reduce network communication requirements, have more convenient use and higher payment efficiency, and is suitable for a fast payment use environment in which a plurality of pedestrian flow devices are simultaneously used.

The invention discloses an amplification system and an amplification method for a video output signal of a radio frequency power probe. The system comprises a detector, a programmable amplifier, a first filter circuit, a data collector, a USB expansion hub, a computer, an operational amplifier follower circuit, a second filter circuit, a digital-to-analogue conversion chip, a lower computer controller and a storage, wherein the programmable amplifier is installed between the detector and the data collector, the first filter circuit is connected between the programmable amplifier and the data collector, the detector is connected with the computer via the USB expansion hub, the data collector is connected with the USB expansion hub via a USB, and the USB expansion hub is connected with the computer via the USB. According to the system and the method provided by the invention, the problem that the transmission waveforms with low transmission power of wireless products cannot be tested or the background noise of oscillogram under test is too high to meet a test requirement is solved, so that the system and the method can be widely applied to the field of standard tests of the wireless products.

The invention discloses an intelligent express way vehicle sensing and streetlamp control method based on a wireless multi-hop ad-hoc network, and the method comprises the steps such as establishment and maintenance of the network, multi-hop transmission of vehicle sensed information and on-off control of a streetlamp. The establishment and maintenance step of the network comprises the following steps that a road side unit (RSU) periodically transmits an own identifier, and each RSU is added to an RSU identifier list according to the received signal threshold value of the RSU identifier and starts or re-starts a timer so as to generate and maintain a neighbor road side unit list. The multi-hop transmission of the vehicle sensed information and the on-off control of the streetlamp comprises the following steps that an on-board unit (OBU) periodically broadcasts own identifier, the RUS receives and forwards / abandons the OBU identifier according to a rule and generates and maintains an OBU identifier list, and the streetlamp is turned on or turned off according to the received content and the list content. The method is combined with corresponding hardware platform, so that requirements of express way operators on the intelligent sensing of vehicles and real-time and robust intelligent control of the streetlamp can be met.

The invention is suitable for the field of computers, and provides an AI-based fire alarm monitoring method and system, and the method comprises the steps: enabling a plurality of monitoring ends to comprise a first monitoring end and a second monitoring end, wherein monitoring information of the second monitoring end and the first monitoring end is uniformly reported to the central control end through a second information interaction channel between the first monitoring end and the central control end; detecting whether monitoring information is normal or not, wherein the monitoring information at least comprises temperature identification information; and when and only when the monitoring information of a certain first monitoring end is detected to be lost and the temperature in the corresponding sub-region monitored by one monitoring end adjacent to the first monitoring end exceeds a historical normal temperature range, judging that the first monitoring end of which the detection information is lost may be damaged due to a fire in the corresponding sub-region. The beneficial effects of the invention are that the method can achieve the positioning of a sub-region where a fire may be found through the judgment of the damage and temperature of a monitoring end, is high in robustness, and facilitates the reduction of cost.

The invention relates to a voltage control method and device for a power distribution network line containing distributed power supplies, and belongs to the field of power distribution network control. The method is characterized by obtaining node voltage of an access node of each distributed power supply in the power distribution network line, and selecting the access node with the node voltage exceeding a normal range and the highest voltage as a guide node; if the voltage of the guide node is in an early warning state, reducing a reactive power value of the distributed power supply at the guide node; and if the reactive power value of the distributed power supply at the guide node reaches the minimum reactive adjustable value and the voltage of the guide node still cannot reach the normal range, reducing the reactive power values of the rest distributed power supplies one by one from near to far according to the distance between the distributed power supplies and the guide node. According to the invention, only a small amount of distributed power supplies are used to adjust the voltage of the guide node to a normal range, and all overvoltage nodes on the distribution network line are gradually recovered to the normal range, so that the reliability and stability of power supply of the distribution network are improved.

The invention discloses a multi-channel information acquisition device for a machine tool, which comprises a circuit board, four ports of the circuit board are respectively provided with mounting holes, and the circuit board is also respectively provided with an AD acquisition circuit, a control circuit and a power supply circuit; the AD acquisition circuit and the control circuit are connected with the power supply circuit, the control circuit is connected with the AD acquisition circuit through a serial port, the AD acquisition circuit is further communicated with the machine tool, and the control circuit is connected with the upper computer through wifi. According to the multi-channel information acquisition device for the machine tool, the independent AD acquisition circuit is used for intelligent control of the machine tool, a more convenient WI-FI communication mode is used for replacing traditional serial port and bus type communication, and the production cost is reduced. Based on a WI-FI communication mode, a control interface is not limited to a PC end, remote control is achieved while the cost of the control system is reduced, the working environment of operators is improved, and convenience and safety are further improved.

The invention discloses a virtual power plant optimal scheduling method and device, and belongs to the technical field of source-network-load interactive operation scheduling and control, and the method comprises the following steps: obtaining day-ahead prediction data and short-time prediction data; and constructing a day-ahead-real-time market double-layer optimization scheduling framework based on the day-ahead prediction data and the short-time prediction data. Aiming at the problem that a virtual power plant with multiple physical entities participates in optimal scheduling of a day-ahead-real-time market, a double-layer distributed optimal scheduling framework is provided for improving the optimization solution time, and a distributed day-ahead optimal scheduling model with the maximum benefit of the virtual power plant as a target is established on the upper layer based on day-ahead prediction data; for the volatility of renewable energy output, a lower layer establishes a real-time scheduling model aiming at following a day-ahead scheduling scheme based on short-time prediction data, an introduced ADMM algorithm is adopted, a centralized optimization problem is converted into a distributed optimization problem, the communication requirement is low, and the calculation speed is high.

The invention relates to a converter control system, a control method and a microgrid. The control system comprises an AC power calculation module, an autonomous operation control module, a normalization operation subtraction module, a current inner loop control module and a DC power calculation module. The control method corresponds to the control system. According to the control system, the AC / DC lines of the AC / DC interconnected microgrid can adopt any topological structure, active power distribution can be automatically realized in all the AC / DC lines, and the converter adopts a decentralized control strategy, does not depend on real-time communication, has low communication requirements and high robustness, and when the power is disturbed or the network structure is changed, the self-adaptive adjustment capability is realized.

The invention provides an event-driven AC microgrid energy storage SOC balance control method, which has the characteristics of high reliability, good scalability, plug-and-play, etc. through the distributed structure, and has the characteristics of low communication requirements through event-driven control. The distributed power calculation method has the characteristics of fast SOC balance and accurate power tracking. The event-driven AC microgrid energy storage SOC balance control method can meet the needs of the battery energy storage system in the AC microgrid. A microgrid energy storage SOC balance control method with good scalability, fast, accurate, low communication requirements, and AC microgrid power balance.

The present invention provides a coordinated control method and system for multi-terminal flexible direct current transmission, including several converter stations adopting a multi-point voltage control strategy, wherein at least one converter station is selected as the main power balance station, and the remaining converter stations are auxiliary power balance stations ; The main power balance station adjusts its own power reference value according to the power reference value of other converter stations or the actual measured power, and quickly adjusts the system power when the power flow of the DC system changes to maintain the DC power grid in a stable state. Operation at the standard voltage; auxiliary power The balance station participates in the adjustment during the dynamic process, and the auxiliary power balance station accurately transmits active power according to the power reference value specified by the system in the steady state. The invention selects the main power balance station to take the initiative to undertake the power balance task, responds quickly, improves the dynamic characteristics of the DC voltage of the system, ensures that the system operates at a standard voltage under steady-state conditions, ensures the transmission power accuracy of each converter station, and reduces the DC voltage droop control. It is difficult to set the slope and has low requirements for communication.