106 results about "Low voltage grid" patented technology

The invention discloses a line loss treatment method based on low-voltage power grid multi-source data fusion, and belongs to the technical field of information, and the method comprises the steps: reconstructing a power supply path based on a power grid topological structure and a changed power access point; extracting reverse power flow characteristics of the frequency points for correcting a node impedance matrix of the current power supply path to obtain a power supply access point impedance parameter set; updating a power transmission path through the reverse power flow characteristic to obtain a power distribution characteristic; and a power grid topological structure, a current power supply path, a power supply access point impedance parameter set and power distribution characteristics are fused to construct a line loss distribution prediction model and identify a line loss abnormal region, and the line loss abnormal region is treated. Through implementation of the method and the device, the problem that the line loss treatment effect is poor due to the fact that the influence of factors such as transformer area topological structure change, power access point change and load fluctuation on the line loss is not considered in the prior art, and the predicted line loss distribution has a large error compared with the actual situation can be solved.

The invention provides a communication method and system based on HPLC and HRF dual-mode fusion, belongs to the field of power line carrier communication, and solves the problem that the communication performance is still insufficient in a three-phase four-wire system low-voltage power grid environment. The method comprises the following steps: in a high-speed power line carrier communication channel of a three-phase four-wire system power grid, dynamically learning an electric phase of each terminal through a carrier coupling success rate, constructing an electric phase identification model, and recording communication characteristics of a phase line to which each terminal belongs; identifying link isolation states among different phase lines by combining an electric phase communication map generated on the concentrator side based on the phase information of each terminal; and under the condition of determining that a cross-phase communication bottleneck exists based on the link isolation state, executing a preset collaborative packet sending optimization strategy, and in the optimization process, establishing an out-phase relay path through a high-speed wireless communication channel.

The invention provides a power grid day-ahead regulation and control method and device based on distributed photovoltaic virtual cluster dynamic division, and the method comprises the steps: obtaining a distributed photovoltaic virtual cluster through the dynamic division of an improved community theory of weight clustering based on distributed photovoltaic characteristic data and a regulation and control target; based on a pre-trained distributed photovoltaic prediction model, predicting future output data of each distributed photovoltaic according to historical output data, historical meteorological data and meteorological prediction data of the distributed photovoltaic in the distributed photovoltaic virtual cluster; and regulating and controlling the distributed photovoltaic virtual cluster according to the regulation and control target and the corresponding regulation and control target function based on the future output data of each distributed photovoltaic in the distributed photovoltaic virtual cluster. According to the method, distributed photovoltaic can be effectively classified, so that the regulation and control capability and the stable operation capability of a low-voltage power grid are improved; meanwhile, the economical efficiency, the safety and the reliability of low-voltage power grid operation are improved.

The invention discloses a low-voltage power grid voltage fluctuation control method and system based on artificial intelligence. The method comprises the steps of obtaining a multi-source data set from a power grid; if the line loss estimation deviation in the multi-source data set exceeds a preset deviation range, iteratively optimizing a preset initial resource allocation scheme according to a multi-objective optimization algorithm to obtain a computing resource allocation scheme; obtaining final line loss distribution characteristics through task grading and parallel decoupling calculation according to a calculation resource allocation scheme; and generating a generator set output adjustment scheme according to the final line loss distribution characteristics, and regulating and controlling the power grid. According to the artificial intelligence-based low-voltage power grid voltage fluctuation control method and system provided by the invention, power grid data are integrated, line loss distribution is analyzed, and a voltage fluctuation trend is predicted, so that the output of a generator set is regulated and controlled, and voltage stabilization and line loss control are realized; therefore, the problem that effective control and line loss treatment are difficult to carry out on the power grid voltage fluctuation can be solved.

The invention discloses a middle and low voltage power grid fault positioning system and method based on grid topology, and relates to the technical field of power grid fault positioning, and the method comprises the steps: obtaining historical electrical parameter records of equipment nodes in grid topology modeling, evaluating the node abnormality degree of the equipment nodes, and obtaining abnormal equipment nodes; obtaining coordinates of the abnormal equipment nodes in the grid topology modeling, traversing the equipment nodes in the grid topology modeling, generating candidate abnormal regions, and evaluating region anomalies of the candidate abnormal regions to obtain a target abnormal region; acquiring traveling wave signal data in the target abnormal area, and positioning a fault in the target abnormal area based on the traveling wave signal data to obtain fault position data of the target abnormal area; and acquiring fault position data in the power grid in the current period, planning a fault maintenance path in the power grid, and dispatching maintenance personnel to sequentially maintain the faults in the power grid according to the fault maintenance path.

The embodiment of the invention provides a fault recording data processing method and device, equipment and a storage medium, and relates to the technical field of electric power. The method comprises the steps of obtaining a wave recording file of a photovoltaic grid-connected point in a preset time period, carrying out data sampling on the wave recording file according to a time period of sampling frequency determined according to the time period of sampling time so as to obtain fault wave recording data, and finally carrying out fault analysis on a power grid fault according to the fault wave recording data. Wherein the time period comprises a fault occurrence stage, a fault development stage or a fault change stage. According to the method, on the premise of ensuring that key fault information is obtained, the data storage amount is effectively reduced, the balance of high sampling rate and low occupied memory of the fault recording data is realized, then a reliable basis is provided for power grid fault analysis, the comprehensiveness and accuracy of power grid fault analysis are greatly improved, and the method is suitable for popularization and application. And safe and stable operation of the low-voltage power grid after distributed photovoltaic large-scale access is ensured.

The invention discloses an electric shock protection method for a low-voltage power distribution network, and belongs to the field of electric shock protection of low-voltage power distribution networks. Decomposing the residual current signal into IMF components based on VMD; total energy of IMF components is calculated, and energy values of different frequency bands are used as features; inputting the features into a pre-constructed electric leakage fault type identification model, wherein the electric leakage fault type identification model identifies different electric leakage scenes; and based on the electric leakage scene identification result, executing a protection criterion. According to the method, the electric shock current component is accurately extracted from the complex residual current waveform, the degree of an electric shock accident is reflected, after the electric shock current is obtained, different action measures are executed according to the effective value of the current, and RCD protection misoperation caused by interference factors and refusal action in the electric shock state are effectively prevented.

The invention provides a dual-mode-based low-voltage power grid state information management method and a dual-mode-based low-voltage power grid state information management system, belongs to the field of power line carrier communication, and solves the problem that the bit error rate is still high in some scenes. The method comprises the following steps: acquiring control harmonic characteristic parameters of grid-connected inverter equipment in a transformer area and physical layer state parameters of a high-speed power line carrier communication channel in the high-speed power line carrier communication channel; on a concentrator side or an edge node side, constructing an error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters so as to identify a link risk state in which feedforward gain limitation and spectrum migration need to be executed; the method comprises the following steps: under the condition of determining that a control harmonic wave causes selective desensitization of a high-speed power line carrier communication front end based on a link risk state, applying feed-forward gain limitation to a high-speed power line carrier communication channel, and migrating a high-risk subcarrier to a low-risk frequency band; and a bypass relay path is established through the high-speed wireless radio frequency communication channel so as to transmit key data in the execution period.

The invention relates to the technical field of transformers, in particular to a signal transformer for multi-path signal coupling of a low-voltage power grid, the signal transformer comprises a magnetic core, an inlet wire winding and an outlet wire winding, efficient electromagnetic coupling and isolation of multi-path signals are achieved through the magnetic core, and a main control chip can send control signals to equipment through a driver and a coupling winding. And receiving an equipment feedback signal. The system can extract characteristics of a control signal and a feedback signal in real time, dynamically calculate a comprehensive crosstalk index, and adaptively adjust parameters of a receiving filter and a driver according to the comprehensive crosstalk index, so that signal crosstalk caused by physical coupling among multiple channels is effectively inhibited. According to the scheme, the structure is simplified, the system cost is reduced, the communication quality and the anti-interference capability of multiple paths of signals in a low-voltage power grid are remarkably improved, and the system is suitable for multiple occasions such as high-reliability power line communication.

The invention discloses a sensing signal transmitting system for liquid caustic soda production, which comprises the steps of acquiring and processing a sensing signal at a production equipment end, coupling the sensing signal with a low-voltage power grid, transmitting the signal by using a high-frequency low-frequency band narrowband communication technology, receiving and processing the sensing signal at a central control end, and inputting the sensing signal into a PC (Personal Computer), various control signals are generated in combination with production process software, and the control signals are coupled and then transmitted to a production equipment end to be processed and executed. A low-voltage power grid high-frequency low-frequency band narrow-band communication technology is adopted, the defects that wiring transmission of sensing and control signals of a traditional liquid caustic soda production line is high and existing carrier communication has high requirements for frequency, frequency band and bandwidth are overcome, and on the basis that stable transmission of the sensing and control signals and normal operation of equipment are met, the communication efficiency is improved. The technical difficulty and cost of the system are reduced, and the problems of technical upgrading and reconstruction of the existing production line and sensing and control signal transmission of a newly-built production line are effectively solved.

The invention discloses an electric energy meter-oriented low-voltage power grid harmonic recognition algorithm optimization method, which relates to the technical field of power systems, and comprises the following steps of: respectively acquiring electric signals at a first sampling frequency and a second sampling frequency, constructing a high-frequency harmonic existence frequency list based on the electric signals acquired at the second sampling frequency, and constructing a high-frequency harmonic recognition algorithm based on a Nyquist sampling theorem. Whether a position locking instruction is triggered or not is judged, after the position locking instruction is received, a high-frequency harmonic existence frequency list is traversed, turn-back frequencies are calculated, energy accumulation is carried out on the same turn-back frequencies, an aliasing high-risk interval is constructed, high-order wavelet packet decomposition is carried out on the aliasing high-risk interval, and a candidate aliasing component sequence is obtained; and for each high-frequency harmonic frequency, calculating total turn-back pollution contribution energy at each turn-back position in the sampling channel under the condition of the first sampling frequency, and performing iterative correction on the candidate aliasing component sequence based on the total turn-back pollution contribution energy.

The invention discloses a user terminal-oriented low-voltage power grid fault early warning method and system, and belongs to the technical field of fault early warning. In the operation process of the low-voltage power grid, collecting environment data around the user terminal in real time; collecting real-time operation data of the power grid equipment; fusing the environment data and the real-time operation data of the power grid equipment; based on the fused data, identifying a potential mode of a power grid fault, and predicting fault occurrence time; and the fault early warning information and the adjustment strategy are fed back to the user terminal in real time, the load change condition after the user receives the feedback is monitored in real time, and dynamic adjustment is carried out. According to the invention, by dynamically adjusting the load and equipment use, the power grid can be further ensured to respond quickly when facing a fault risk, and the possibility of fault occurrence is reduced, so that the operation efficiency, stability and reliability of the power grid are effectively improved.

The invention discloses a low-voltage intelligent management and control device, particularly relates to the technical field of low-voltage power system management, and realizes accurate expression of a low-voltage power system structure through multi-level power network model construction and topology updating. Identifying a potential propagation path through fault feature vector extraction and graph neural network training; the risk probability of each path is predicted through the long-short-term memory network, and the fault risk prediction index is formed by combining the operation risk index and the electrical risk index, so that the problem that the fault is difficult to locate and block in time in the traditional low-voltage management and control is solved; performing priority protection on a key path through dynamic threshold regulation and control; the method can achieve the advanced prediction and active prevention and control of potential faults in a low-voltage power grid, reduces the chain loss caused by fault spreading, and improves the operation reliability and power supply safety.

The invention provides a prediction method, device and equipment for a power failure range of a low-voltage power grid, a medium and a product. The method comprises the following steps: acquiring a low-voltage power grid operation variable after disturbance is added into a low-voltage power grid and a variable reference value during normal operation of the low-voltage power grid; determining a time sequence data set of each component in the low-voltage power grid operation variables according to the low-voltage power grid operation variables; according to the time sequence data set of each component and the prediction register, performing prediction processing on the low-voltage power grid operation variables to obtain a predicted operation variable sequence; determining a component power failure prediction index corresponding to each component according to the prediction operation variable sequence; according to the variable reference value during normal operation, the component power failure prediction index corresponding to each component is verified to obtain the low-voltage power failure prediction index, and the accuracy of predicting the power failure range of the low-voltage power grid is improved.

The application discloses a kind of dynamic response 5G communication differential protection data transmission method, so that the differential protection service based on 5G communication is widely applied in low-voltage distribution network field, promote the development of new technology of power grid relay protection, solve the protection terminal of traditional low-voltage power grid not dependent on channel cannot give consideration to speed and selectivity requirement, by using advanced 5G communication technology, with the high bandwidth of 5G communication network, low latency and high reliability wireless communication environment, realize the large-scale application of longitudinal differential protection in closed-loop operation low-voltage power grid, improve the protection level of power grid.The application applies dynamic response transmission mode in the communication process of distribution network transmission line differential protection based on 5G communication, meets the rapidity requirement of relay protection, reduces 5G communication transmission flow, saves communication resources and reduces communication cost.

The invention discloses a high-voltage multi-section constant-current LED emergency lighting driving system and a control method. Relates to the technical field of power supply. Comprising LED lamp beads, an alternating current power supply part, an EPS power supply part and a driving IC. The alternating current power supply part and the EPS power supply part supply power to the same LED lamp bead through the same driving IC; according to the scheme, a traditional circuit structure is improved, the alternating current power supply part and the EPS power supply part supply power to the same LED lamp bead through the same driving IC, and the purposes of reducing cost and simplifying a circuit are achieved; wherein the alternating current power supply part accords with high-low voltage power grid input and meets sub-harmonic requirements; meanwhile, the EPS power supply part outputs constant voltage, the output power of the voltage changes along with the combination of the LED lamp beads, linear driving is shared to realize single-section constant current, and the purposes of reducing the cost and simplifying the circuit are realized on the premise of flexibly realizing EPS illumination application of different powers.

The application discloses a line loss treatment method based on low-voltage power grid multi-source data fusion, and belongs to the information technology field.The method is as follows: based on the power grid topological structure and the changed power supply access point, the power supply path is reconstructed; the reverse power flow characteristics of the frequency point are extracted to correct the node impedance matrix of the current power supply path, and the power supply access point impedance parameter set is obtained; the power transmission path is updated through the reverse power flow characteristics, and the power distribution characteristics are obtained; the line loss distribution prediction model is constructed by fusing the power grid topological structure, the current power supply path, the power supply access point impedance parameter set and the power distribution characteristics, and the line loss abnormal area is identified and treated. Through the implementation of the application, the influence of the factors such as the change of the transformer area topological structure, the change of the power supply access point and the load fluctuation on the line loss is not considered in the prior art, so that the predicted line loss distribution has a large error compared with the actual situation, and the line loss treatment effect is poor.

The utility model relates to the field of farm deinsectization, in particular to a hanging type deinsectization device for a cow breeding room, which comprises a cylinder, a top cover is fixedly mounted at the top of the cylinder, a deinsectization mechanism is arranged on the inner wall of the cylinder, the deinsectization mechanism comprises a bait box and a driving motor, the bait box is in threaded connection with the inner wall of the cylinder, and the driving motor is in threaded connection with the cylinder. The driving motor is fixedly installed on the inner top wall of the top cover, an output shaft of the driving motor is fixedly connected with a connecting rod, the surface of the connecting rod is fixedly connected with a low-voltage power grid, a reciprocating motor is fixedly installed at the lower end of the connecting rod, and an output shaft of the reciprocating motor is fixedly connected with a threaded rod. Compared with the prior art, the hanging type deinsectization device for the dairy cow breeding room is provided with the deinsectization mechanism, the storage bag and the clamping mechanism, after the storage bag is filled with flies, the storage bag can be separated from the cylinder only by pulling an arc-shaped plate outwards, and the killed flies are received through the storage bag, so that the cylinder does not need to be cleaned; and the use of workers is more convenient.

The utility model discloses a three-in-one transformer cabin for a power van, and relates to a structure of a mobile power van. The system comprises a cabin body, power conversion equipment is arranged in the cabin body, a plurality of emergency management assemblies used for controlling the working state of the power conversion equipment are arranged on the outer side wall of the cabin body, and the power conversion equipment comprises low-voltage grid-connected equipment, medium-voltage grid-connected equipment, a ring main unit and mobile box-type substation equipment which are arranged in parallel. The system integrates a low-voltage grid-connected function, a medium-voltage grid-connected function, a power distribution protection function, a complete-set power transformation and distribution function and the like, so that the system is more powerful in function and more convenient to use.

The application belongs to the technical field of power systems, and discloses a low-voltage power grid operation state monitoring method and device, the method comprising: based on a pre-constructed Internet of Things architecture, obtaining operation state data of a target power grid device, and gathering the operation state data to a transformer area fusion terminal; processing the operation state data transmitted by the transformer area fusion terminal, and sending the processing result to a plurality of service terminals; in response to the processing result, each service terminal generates a cooperative monitoring result. The scheme of the application expands the dimension of low-voltage power grid state monitoring, expands the data volume, and improves the real-time performance of state monitoring.

This invention provides an automatic modeling method and system for low-voltage power grid data based on visual data acquisition, relating to the field of low-voltage power grid technology. The method includes: dividing the low-voltage power grid area into multiple sub-regions and constructing multiple local coordinate systems; analyzing the power grid equipment to be acquired and determining at least one matching local coordinate system; configuring a visual data acquisition task template, performing data acquisition to obtain at least one set of equipment modeling data; constructing a multi-region coordinate system transformation model, performing coordinate system transformation to obtain at least one set of equipment modeling transformation data corresponding to the equipment modeling data, and generating visual modeling simulation results for the data acquisition task. This invention solves the technical problem in existing technologies where, in the process of low-voltage power grid data modeling, a large, unified global modeling coordinate system is typically established for data acquisition or modeling of all power grid equipment. While this achieves a unified effect, it is not accurate enough, affecting the true reflection of power grid data and its application effectiveness.

The invention belongs to the technical field of power transmission and distribution of a power system, and particularly discloses an AC-DC three-dimensional interconnected power transmission and distribution system based on a flexible converter, which comprises a power transmission network, a power distribution network and the flexible converter, the power transmission network comprises an extra-ultra-high-voltage power grid, a high-voltage power grid and a medium-low The centralized new energy comprises Saggog new energy, water-wind-light new energy and offshore wind power new energy; electric energy generated by the centralized new energy and the distributed new energy is transmitted to a load through the flexible converter, the power transmission network and the power distribution network. According to the invention, the three-dimensional topological structure containing multi-voltage-level power grid interconnection is constructed, so that integrated calling of centralized new energy and distributed new energy is realized, the capability of a power system for efficient and safe grid connection and consumption of large-scale new energy is improved, and through the AC-DC hybrid power grid constructed based on the flexible converter, the power grid connection efficiency is improved. Electric energy mutual aid and power flow optimization are realized, and the operation flexibility and reliability of a power system are enhanced.

The invention discloses a method and system for evaluating the power supply risk of new energy access to low-voltage users, and relates to the technical field of power systems, and the method comprises the steps: collecting the historical data of new energy power generation data and low-voltage power grid data, and carrying out the data preprocessing; analyzing influence factors, and establishing a risk assessment model based on an analysis result; constructing a risk index system according to a result of the risk assessment model; calculating the risk assessment model by using the real-time operation data to obtain a current power supply risk level; and performing fitting analysis on the model by using historical data, and predicting a future power supply risk trend. According to the method for evaluating the power supply risk of the low-voltage user by new energy access, the low-voltage user power supply risk evaluation index analysis model considering distributed new energy access is established, so that the user power supply reliability evaluation accuracy is improved.

The invention relates to a charging system and method for a vehicle low-voltage power grid and a vehicle. The charging system comprises a charging module, one end of which is connected with the low-voltage power grid; the USB interface enables the other end of the charging module to be connected with external power supply equipment through a USB protocol; wherein the charging system transmits electric energy from power supply equipment to the low-voltage power grid.

This patent discloses a power supply method and system for hybrid aircraft, belonging to the field of aviation electrical systems. It is used to solve the problem of integrating the high-voltage and low-voltage power grids of hybrid aircraft. On the one hand, it realizes efficient electric propulsion and significantly reduces fuel consumption. On the other hand, it uses an energy storage device to combine the electric propulsion system with starting and generating technology, improving the system's integration and reuse capabilities. The power supply system of the present invention includes: an energy storage device, a hybrid generator, a starter generator, a prime mover, an electric propulsion system, and an electric energy distribution system.

Methods and systems for switch-on control or charging control of energy end-consuming electric devices. An example includes: connecting an electric device to a low-voltage grid; generating a uniquely coded consumer point identification on a grid section between an energy consumption meter and the connection point; detecting the identifier in a modulation signal; forwarding the identifier to t a control unit of the device; and sending an authorization request, either clearance to switch on to charge the electric device. A service offered by a provider connects, via an API module to the device as a client and transfers the identifier to the provider. The method automatically switches on or charges the electric device under contracted energy supply conditions for the energy cost optimization of the electric device.

The invention relates to the technical field of reactive compensation systems, in particular to a low-voltage power grid reactive compensation system which comprises a reactive power acquisition unit, a data processing unit, an intelligent control unit, a compensation unit and a feedback unit. The reactive power acquisition unit utilizes an acquisition module and a monitoring module to monitor and acquire parameters of reactive power, voltage and current in a power grid in real time, and the data are acquired, so that evaluation and basis are provided for the running state of the power grid and formulating of a compensation strategy; the data processing unit is used for analyzing the collected parameters of reactive power, voltage and current in the power grid so as to judge whether the power grid needs reactive power or is excessive; the circulating cooling effect is improved, the cooling energy consumption is reduced, the fire extinguishing efficiency is improved, the fire extinguishing safety is improved, the voltage quality is improved, the operation stability of a power grid is improved, the service life of a transformer is prolonged, and the maintenance cost of equipment is reduced.

The application provides a communication method and system based on HPLC and HRF double-mode fusion, and belongs to the field of power line carrier communication, and solves the problem of insufficient communication performance in a three-phase four-wire low-voltage power grid environment. The method comprises the following steps: in the high-speed power carrier communication channel of the three-phase four-wire power grid, the power phase of each terminal is learned dynamically through carrier coupling, an electric phase identification model is constructed, and the communication characteristics of the phase line to which each terminal belongs are recorded; in combination with the electric phase communication spectrum generated on the concentrator side based on the phase information of each terminal, the link isolation state between different phase lines is identified; in the case where it is determined based on the link isolation state that there is a cross-phase communication bottleneck, a preset cooperative packet sending optimization strategy is executed, and in the optimization process, a cross-phase relay path is established through a high-speed wireless communication channel.

The utility model discloses a generator set loading test system. The system comprises a generator set, a feedback type electric energy recovery module, an isolation transformer, a low-voltage power grid, a data acquisition module, an upper computer module and a control module, the generator set, the feedback type electric energy recovery module, the isolation transformer and the low-voltage power grid are electrically connected in series; the data acquisition module is electrically connected with the low-voltage power grid; the data acquisition module is in communication connection with the upper computer module; the upper computer module is in communication connection with the control module; the control module is electrically connected with the feedback type electric energy recovery module. According to the scheme, the electric energy of the generator or the generator set is recycled while the loading test is completed, so that the electric energy is prevented from being consumed in a heating form.

The application discloses a new mine selective leakage protection method based on a standard current change trend and belongs to the field of coal mine low-voltage power grid fault diagnosis. In view of the problems that the commonly used selective leakage protection device has the problems of malfunction, misoperation, low-voltage switch leakage misoperation or step jump, and low line selection accuracy, the application proposes a mine selective leakage protection method based on a standard current change trend by connecting a switchable middle resistor in parallel with a zero sequence reactor of an additional direct current power supply device. Firstly, the zero sequence current flowing through the zero sequence reactor and each line before and after the input of the parallel middle resistor is obtained, the standard current of the zero sequence current of each line is obtained by taking the amplitude of the zero sequence current of the zero sequence reactor as a reference value, the change trend of the standard current of each line before and after the input of the middle resistor is compared, the standard current of the fault line shows an upward trend after the input of the middle resistor, while the standard current of the healthy line is unchanged, and finally the fault line selection is realized. The method has strong transition resistance capacity, only needs to measure the amplitude of the zero sequence current of each line, does not need to calculate the phase, is not affected by the phase measurement error and non-synchronous sampling, and is not affected by the transition resistance in principle.