312 results about "Power-line communication" patented technology

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

Method for detecting a state of a connection between an electrically driven motor vehicle (1) and a corresponding charging station, wherein the motor vehicle (1) has a “Control Pilot (CP)” function with a vehicle-side “Control Pilot (CP)” line (3), characterized in that a length of a “Control Pilot” line between the motor vehicle and the charging station is measured by means of a “Power Line Communication” (PLC) chip (4), wherein the length of the “Control Pilot” line between the vehicle and the charging station using signal reflection and signal attenuation or -runtime is measured, wherein the PLC chip (4) sends a signal along the CP line between the motor vehicle and the charging station and receives the signal reflected at the end of the CP line between the motor vehicle and the charging station and running back to the PLC chip (4), wherein the length of the path traversed by the signal is determined based on the signal runtime, wherein the length of the CP line between the motor vehicle and the charging station is clearly determined from the distance traveled by the signal and a specific cable type is determined based on the length of the CP line between the motor vehicle and the charging station.

The invention relates to an electric power communication system optimization technology, in particular to a physical layer security optimization method and equipment for a full-duplex multicarrier power line communication system, and the method combines a full-duplex technology and a time domain artificial noise auxiliary security strategy to construct a multicarrier power line communication system model with a relay; generating a safety rate maximization problem, designing a set of convex approximation method, and performing conversion and simplification of a non-convex optimization problem; designing an iterative solution algorithm, and jointly optimizing the confidential data of the source node, the confidential data of the relay node and the artificial noise power distribution matrix; and optimizing the physical layer safety performance of the full-duplex multi-carrier power line communication system based on the solved power distribution matrix. According to the communication scheme and the solved power distribution vector, the safety performance of the power line communication system is optimized, the limitation of the number of power transmission cables in the power line communication system is avoided, the safety rate maximization of the total transmitting power domain can be realized, and the technical problem that data in an existing multi-hop power line communication system is prone to leakage is solved.

The invention relates to the technical field of power signals, in particular to a power line broadband carrier signal adaptive enhancement and noise reduction method and system. According to the method, the multi-dimensional interference characteristics of the power line transmission environment are acquired and the initial modulation parameters are pre-adjusted, so that the influence of environmental interference can be reduced at the initial stage of signal transmission, the signal transmission quality is improved, and the multi-path delay inequality of the aggregated signal and the channel attenuation coefficient are acquired in real time and are combined with dynamic channel adjustment, so that the signal transmission efficiency is improved. Signal components can be dynamically adjusted and optimized according to real-time changes of a power line channel, the adaptive capacity of a system is improved, signals can be optimized in real time by means of real-time transmission quality monitoring and optimization of enhanced carrier signals, the lagging influence of signal quality is avoided, and the system performance is improved. The method ensures that the power line communication system has good adaptive enhancement and noise reduction capabilities, improves the overall performance of the communication system, and can effectively overcome the influence of multipath effect, electromagnetic interference, attenuation and other factors on channel estimation in the prior art.

The invention relates to the technical field of communication, in particular to an intelligent selection and switching method and system for power line broadband carrier communication channels. According to the method, the multi-modal channel quality basic data including the signal quality modal data, the transmission performance modal data and the interference characteristic modal data are introduced, and a scoring mechanism of the signal stability, the transmission efficiency and the anti-interference capability is combined, so that the comprehensive evaluation precision of the power line communication channel quality is effectively improved; real-time communication state information of upstream and downstream equipment is dynamically obtained through a feedback link, a channel quality score is optimized and corrected, and a communication demand matching degree is comprehensively considered, so that the intelligence and the adaptive capability of channel selection and switching are further improved, and therefore, a comprehensive evaluation index of a communication channel can be monitored in real time, and the communication efficiency is improved. The optimal communication channel is automatically selected or switched according to the evaluation result, so that the stability of the communication quality and the transmission efficiency are ensured, and the reliability of the power line broadband carrier communication system is effectively improved.

The invention discloses a quaternary data processing system based on a multi-level signal and a dual-storage architecture, and relates to the technical field of data processing, in particular to a quaternary data processing system combining multi-level signal coding, a dual-storage architecture synchronization strategy and a quantum compatibility design. According to the system, through collaborative design of multi-level signals and a double-storage architecture, the density bottleneck and anti-interference shortages of a traditional binary system are solved, meanwhile, a classic data interface is provided for quantum calculation, and the system can be widely applied to the fields of power line communication, industrial automation, quantum calculation acceleration and the like.

A charging device is connected to an external device by a power line and charges an electric vehicle. The charging device includes: a communicator that obtains a connection notification signal from the electric vehicle by wired communication, the connection notification signal indicating that the electric vehicle and the charging device are connected; and a converter that converts the connection notification signal obtained into a signal format compliant with a communication standard of first power line communication performed over the power line to obtain a converted connection notification signal, and outputs the converted connection notification signal to the external device by the first power line communication. The wired communication is communication different from the first power line communication.

According to the novel transponder device and the method and device for achieving multiple functions through power line carrier communication, multiple functions such as train positioning and speed measurement, station track occupation recognition, train occupation and integrity check and train-ground communication are achieved through the novel transponder device and the power line carrier communication, and wireless communication technologies such as the power line carrier communication are integrated; the method can be applied to train operation control, train-ground coordination action, locomotive vehicle information management, unmanned stations and train state monitoring in various scenes, can simplify the types of equipment, reduces the construction cost and the maintenance workload, and improves the transportation efficiency and safety at the same time.

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.

A photovoltaic inverter includes an inverter circuit, a communication circuit, an arc detection circuit, and a transformer. The transformer includes one magnetic core, at least one primary-side coil, and at least two secondary-side coils. The primary-side coil and the secondary-side coils of the transformer are wound around the magnetic core. One end of a first primary-side coil of the transformer is configured to connect to a power supply, the other end of the first primary-side coil is configured to connect to an input end of the inverter circuit, a first secondary-side coil of the transformer is configured to connect to the communication circuit, and a second secondary-side coil of the transformer is configured to connect to the arc detection circuit, to implement both power line communication and arc detection on the basis that the transformer includes the magnetic core.

The invention provides a cooperative identification method and system for a power line communication signal and an arc fault, and the method comprises the steps: firstly, constructing and training a double-flow communication fault sensor comprising a sensing early-warning sub-module and an active sensing sub-module, then carrying out the communication fault sensing based on the double-flow communication fault sensor, generating a communication fault sensing data set, and transmitting the communication fault sensing data set to a server; then, a graph neural network is adopted to carry out fault mode recognition on the communication fault sensing data set, a communication fault mode graph is generated, then, communication fault positioning is carried out based on the communication fault mode graph, a communication fault positioning data set is generated, and finally, actual feedback data of the communication fault positioning data set is obtained. And the system is updated according to the actual feedback data, so that the fault diagnosis rate and accuracy are improved.

The invention discloses a frequency spectrum and power distribution method for a hybrid power line / wireless MIMO (Multiple Input Multiple Output) system, which relates to the technical field of hybrid power line / wireless MIMO system communication and comprises the following steps: establishing a channel model for wireless MIMO communication and power line communication based on OFDM (Orthogonal Frequency Division Multiplexing) modulation; the method comprises the following steps: performing precoding and merging processing on wireless MIMO signals by adopting SVD (Singular Value Decomposition), so that each sub-carrier forms a plurality of parallel sub-channels; frequency spectrum allocation and power allocation are carried out through alternate optimization, and greedy frequency spectrum allocation is carried out according to parallel channel gains. According to the frequency spectrum and power distribution method for the hybrid power line / wireless MIMO system, a water injection algorithm is adopted to perform joint power distribution on wireless and PLC subcarriers, so that the power distribution is more flexible, the reliability of data transmission is improved, SVD is adopted to perform channel pre-coding, and a maximum ratio combining method is combined to combine receiving end signals, so that the reliability of data transmission is improved. And the signal quality and the system robustness are enhanced.

The invention discloses a power line communication signal sending and receiving method and device based on a semi-parallel architecture, and belongs to the technical field of power system communication. The method comprises the following steps: obtaining a sending signal comprising a plurality of sub-signals, dynamically determining the number R of parallel processing units according to a transmission data rate and a clock frequency, phase adjustment, frequency domain transformation, linear combination and filtering processing are carried out through R parallel processing units in the DCT module, the matrix module and the multi-phase filter module in sequence, and finally processed signals are serialized and sent to a power line channel; and the receiving process reversely executes corresponding processing. Therefore, by implementing the method and the device, the problem that the transmission rate and the communication stability of the system are difficult to effectively improve while low resource consumption and low power consumption are ensured in the prior art can be solved.

A power and communication transmission arrangement includes an electronic accessory having a first modulator / demodulator. A motor vehicle includes a charging system to provide a power signal to the electronic accessory. At least one electrical conductor carries the power signal from the charging system to the electronic accessory. An infotainment system bi-directionally communicates with the electronic accessory. A second modulator / demodulator modulates the power signal based upon first signals received from the infotainment system to form first modulated power signals such that the first modulator / demodulator demodulates the first modulated power signals to extract the first signals for use in the electronic accessory. The first modulator / demodulator modulates the power signal based upon second signals from the electronic accessory to form second modulated power signals such that the second modulator / demodulator demodulates the second modulated power signals to extract the second signals for use in the infotainment system.

The embodiment of the present application discloses a power line communication time slot allocation method, which comprises the following steps: a first relay node receives a first time slot allocation message sent by a superior node, the first time slot allocation message comprises forwarding information and first time slot information, wherein the forwarding information comprises a forwarding indication that at least one relay node needs to forward the first time slot allocation message; the first relay node updates the first time slot information to obtain second time slot information; wherein the updating comprises deleting expired time slot indications in the first time slot information; and the first relay node sends a second time slot allocation message containing the forwarding information and the second time slot information. According to the embodiment, each relay node can delete the expired time slots before forwarding the time slot indication information, thereby saving transmission resources and improving processing efficiency.

The embodiment of the invention discloses a photovoltaic junction box and a photovoltaic panel control system, a positive electrode interface and a negative electrode interface are arranged in the photovoltaic junction box and are respectively connected with the positive electrode and the negative electrode of a photovoltaic panel, the positive electrode and the negative electrode of the photovoltaic panel are both connected with a power line, and a bypass circuit is arranged between the positive electrode interface and the negative electrode interface. And arranging a power line communication circuit between the positive interface and the negative interface to realize data communication according to a power line. Therefore, the communication of the photovoltaic panel is realized under the condition of not arranging an additional device, and the cost of the photovoltaic panel control system is reduced.

The invention discloses a multi-node dynamic power line channel simulation system, which is applied to the technical field of power line communication and is used for solving the problem of limited authenticity and adaptability of power line channel simulation in the prior art. In the on-site power grid end channel characteristic acquisition system, a first power line channel characteristic acquisition device periodically sends an original excitation signal through an excitation signal sending module, and a second power line channel characteristic acquisition device receives the original excitation signal through an excitation signal receiving module. Collecting a current filter coefficient of the first filter when the original excitation signal is received each time, and transmitting the current filter coefficient to the communication simulation equipment; in the laboratory end communication simulation system, communication simulation equipment configures a current filter coefficient to a corresponding second filter for communication simulation, so that dynamic capture of channel characteristics changing along with changes of external factors such as air temperature and load is realized through periodic excitation signal transceiving and filter coefficient training acquisition; and the authenticity and adaptability of the power line channel during communication simulation are improved.

The present invention discloses a visible light communication device based on a power line carrier circuit and a communication method thereof. The device includes: an Ethernet interface circuit, a power line carrier circuit, a switching switch, a signal attenuation circuit, a light source driving circuit, a light source, an avalanche photodiode, a photoelectric conversion circuit, a linear amplifier circuit, and a power detection circuit. The switching switch can switch the signal transmission mode from visible light communication to power line communication when the optical communication quality is poor, thereby improving the stability of the communication system. The power line carrier circuit modulates the signal in various ways, including OFDM, QPSK, BPSK, and ROBO. Compared with traditional visible light communication systems using OOK modulation, the communication rate and stability are significantly improved. The power detection circuit, the signal attenuation circuit, and the light source driving circuit cooperate to effectively control the power of the transmitted signal, enabling the signal to be transmitted without distortion. In addition, the power line can be replaced with a wire, twisted pair, etc., further improving the anti-interference capability and mobility.

The invention relates to the field of power line channel modeling, in particular to a power line channel modeling method, system, equipment and medium, power line channel data is actually measured and collected and preprocessed, channel characteristics are extracted, parameters such as characteristic impedance and propagation constant of a power line are calculated by using a transmission line theory, and the power line channel is modeled. Constructing an enhanced conditional generative adversarial network comprising a generator and a discriminator, inputting parameters obtained by theoretical calculation of a transmission line as conditional information in a training process, optimizing structures and loss functions of the generator and the discriminator, enabling the generator to generate a high-quality analog channel sample, fusing a deep learning model with a transmission line theoretical model, and obtaining a high-quality analog channel sample; according to the method, a mixed channel model is formed, model parameters are alternately trained and optimized, accurate prediction of transmission characteristics of the power line channel is realized, complex characteristics of the power line channel can be effectively modeled, and a reliable basis is provided for design optimization of a power line communication system.

A method and apparatus are provided for detection of faulty installations of Photovoltaic Modules equipped with associated Module Level Shutdown Devices, MLSDs, connected serially as a chain within a string of Photovoltaic Modules to a string loop interface of a detector device. The method comprises the steps of: transmitting a Permission to Operate, PTO, signal through its loop string interface to the chain of MLSDs, using Power Line Communication, PLC; capturing a string voltage waveform provided by the chain of serially MLSDs of the Photovoltaic Module string to the loop string interface of the detector device as a result of switch-on transients generated by the MLSDs in response to the PTO signal received by the chain of MLSDs from the loop string interface of the detector device, wherein switch-on delays of the generated switch-on transients are spread in a predefined maximum delay time period; and analyzing the captured string voltage waveform, Vstr, provided by the chain of MLSDs of the Photovoltaic Module string to determine a number, N, of Photovoltaic Modules and associated MLSDs within the Photovoltaic Module string being installed correctly within the Photovoltaic Module string.

The invention provides an OFDM (Orthogonal Frequency Division Multiplexing) system signal demodulation method and system based on dynamic noise estimation, and belongs to the technical field of power line communication. The method comprises the following steps: acquiring a receiving frequency domain signal of an OFDM symbol; calculating a noise estimation value according to the received frequency domain signal; according to the noise estimation value, calculating a mean value estimation value of the noise variance or a median estimation value of the noise square, and according to the mean value estimation value of the noise variance or the median estimation value of the noise square, calculating a noise power estimation value; calculating a dynamic weight according to the noise power estimation value; obtaining a balanced receiving frequency domain signal according to the receiving frequency domain signal and the dynamic weight; and performing demodulation judgment on the balanced receiving frequency domain signal to obtain a signal demodulation result. The method can adapt to a time-varying noise environment in power line communication, so that the signal receiving performance is improved.

A power distribution management system dynamically manages power from an inverter to ensure uninterrupted supply to critical devices, such as power tools, while selectively controlling power to interruptible devices, such as battery chargers, to maintain total current below a predefined threshold. The system includes a microcontroller, an analog-to-digital converter for precise current measurement, and a powerline communications module for real-time data exchange. Current transformers monitor power to each connected device, enabling the system to identify and disconnect lower-priority loads, such as battery chargers, during high-demand periods, while ensuring essential tools remain powered. The system automatically restores power to disconnected devices when load conditions allow, optimizing efficiency and preventing overloading. This intelligent power management approach is particularly suited for portable or hybrid power systems in industrial and field applications.

The present invention discloses a T-type impedance matching coupler for power line communication, belonging to the technical field of power line communication. It includes a transmitting end, to which a first capacitor and a first inductor are connected, and then a second inductor, a Π-type structure, and a power line equivalent circuit connected in parallel are connected. A third inductor is connected between the Π-type structure and the power line equivalent circuit, and the transmitting end is connected to a ground wire; the first capacitor and the first inductor resonate at the center frequency. The present invention realizes the functions of impedance matching, signal coupling, and DC isolation between the transmitting end, the receiving end, and the power line by designing a T-type impedance matching coupling circuit with a simple circuit structure, with a low level of complexity. At the same time, a power line equivalent circuit is designed, taking into account the impedance caused by the equivalent resistance and equivalent inductance of the power line. Through simulation and physical tests, the designed T-type impedance matching coupling circuit can obtain a gain of 3 dB - 7 dB compared with the coupling circuit under impedance mismatch conditions.

This application provides a photovoltaic inverter and a control method thereof. The photovoltaic inverter includes an inverter circuit, a communication circuit, an arc detection circuit, and a transformer. The transformer includes a magnetic core, at least one primary coil, and at least two secondary coils. The primary coil and secondary coil of the transformer are wound around the magnetic core. One end of the first primary coil of the transformer is configured to connect to a power source, and the other end of the first primary coil is configured to connect to an input terminal of the inverter circuit. The first secondary coil of the transformer is configured to connect to the communication circuit, and the second secondary coil of the transformer is configured to connect to the arc detection circuit. By including the magnetic core in the transformer, both power line communication and arc detection are realized. According to this application, the communication circuit and arc detection circuit can be centrally arranged in the inverter, thereby reducing installation space while ensuring power supply safety, reducing design costs of the photovoltaic inverter, and achieving a simple structure, simple method, and high applicability.

The invention discloses an information feedback method and device and related equipment, and belongs to the technical field of communication. The information feedback method comprises the following steps: performing channel state information estimation on a dual-mode channel of the MIMO-PLC system to obtain a first dual-mode channel matrix; n optimal codebook vectors are selected from a pre-stored dual-mode codebook, each optimal codebook vector is a dual-mode codebook vector closest to each dual-mode channel vector in spatial distance, and the dual-mode codebook is a codebook adaptive to multiple input multiple output (MIMO) spatial characteristics and power line communication PLC medium characteristics; generating a first index according to the N optimal codebook vectors; and sending first information to the transmitting end, wherein the first information comprises the first index. The feedback content is simplified from a complete channel matrix to a low-bit dual-mode codebook index, and the dual-mode codebook adapts to MIMO spatial characteristics and PLC medium characteristics, so that the requirements of the system for reliability and real-time performance of CSI feedback are met.

The present application relates to a noise cancellation method, a receiving device, and a medium for a power line communication system. The noise cancellation method is used for a power line system including a transmitting device, a receiving device, and a power line, and the transmitting device communicates with the receiving device through the power line. The method includes: the receiving device receives a first signal sent by the transmitting device through the power line, and divides the first signal into a plurality of first signal segments; the receiving device determines the noise interval to which the signal energy value of each first signal segment belongs, and performs noise cancellation on the signal using a noise cancellation method corresponding to the noise interval. Through the method of the present application, the receiving device can calculate and determine the noise interval parameter and the noise interval of the noise interval parameter through the signal energy value of the noise segment in the actual signal sent by the transmitting device, and can perform noise cancellation more accurately for different signals sent by the transmitting device.

The invention discloses a power line channel modeling method and device based on a full-connection conditional generative adversarial network, and a medium, and belongs to the technical field of power line channel modeling, and the method comprises the steps: carrying out the efficient feature extraction and coding of conditional information through a full-connection encoder, converting the conditional information into a feature vector with better representation capability, and carrying out the feature extraction and coding of the conditional information; the input is used as the input of the generator and the discriminator. Conditional information is integrated into the generative adversarial network, and a generator generates corresponding transmission function data according to the conditional information. By improving the accuracy and correlation of the data generated by the generator and enhancing the capability of distinguishing the real data from the generated data by the discriminator, the complex characteristics and time-varying characteristics of the power line channel can be effectively captured, and the transmission function highly consistent with the real data can be predicted and generated according to the condition information. According to the method, more accurate and reliable model support can be provided for design, optimization and evaluation of the power line communication system.

The present application relates to the technical field of power line communication, and discloses a frame synchronization method and device for broadband power line communication. The method includes: obtaining a cross-correlation result sequence by performing symbolized cross-correlation operation on a received signal; performing secondary autocorrelation analysis and accumulation processing on the cross-correlation values in the sequence to generate an autocorrelation accumulation value sequence; screening candidate peak positions according to the absolute values of the autocorrelation accumulation values; defining a synchronization peak analysis window around the candidate peak positions, and setting a noise reference window in a region far from the window; verifying the effectiveness of the candidate peaks based on the difference in autocorrelation accumulation values between the synchronization peak window and the noise reference window; if the verification is effective, determining the final synchronization position by calculating the mean value of multiple peak positions within the synchronization peak window. This method solves the problem of inaccurate synchronization peak positioning in the existing methods under multipath effects and noise interference through an autocorrelation accumulation and noise separation mechanism, and improves the reliability of frame synchronization.

A method for a power system is disclosed. The method includes receiving signals, activating switches to pass a current from a power source to an apparatus. The method also includes deactivating switches and bypassing the power source. The power source may be a photovoltaic power source. The signals may be power line communication (PLC) signals.

The invention provides a power line communication method and device which are applied to a power line carrier communication system. The method comprises the following steps: a first node sends a first frame and receives a first channel detection result; wherein the first frame comprises a first training domain and a first load area, the first load area is used for bearing first service data, and the first training domain is used for channel detection. The first channel detection result comprises a first communication parameter, and the first communication parameter is determined according to the first frame. By adopting the method, the first node can transmit the first service data to the second node by sending the first frame, and can also indicate the second node to perform channel detection through the first training domain, thereby reducing the interaction process between the nodes, avoiding resource waste and improving the communication efficiency.