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

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 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 proposes a method for determining a trust level of a participant in a communication connection between a first communication party and a second communication party in order to adapt the communication behavior to the determined trust level. The participant is equipped with a trust certificate and a participant private key which is securely stored separately from the trust certificate. The first communicating party receives the trust certificate from the participating party, from which the trust level is derived and determined. The first communicating party uses the private key of the participating party to test whether the trust certificate belongs to the participating party. In case the test confirms that the trust certificate belongs to the participating party, the first communicating party communicates the determined trust level to the second communicating party. Then, at least one parameter of the communication behavior is selected according to the determined trust level.

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 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 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 the technical field of distribution network automation systems, in particular to a negative-sequence current-based feeder automation method and system for an overhead line. Fault point positioning is carried out through interactive fault negative-sequence current information between adjacent automation terminals according to the principle that fault negative-sequence current is detected at a power supply side of a fault point and the fault negative-sequence current is not detected on a load side, so that quick fault isolation and quick power supply restoration of a power distribution network are quickly achieved. In a fault treating process, substation outlet switches are reclosed once and sectional switches at the power supply side of the fault point are reclosedonce, so that the fault treating time is shortened and the number of impacts on the power distribution network is reduced. A wireless communication mode is adopted in the absence of an optical fiber communication condition. The interactive information is limited between two adjacent terminals and is small in amount of information, so that the requirements on communication are reduced.

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.