40 results about "Frequency coordination" patented technology

The invention discloses an active power and frequency coordination control method for a wind storage combined system, and belongs to the technical field of electric power system operation and control. The problems that in the prior art, due to wind power and load uncertainty, the frequency control effect is poor, energy storage life management is insufficient, and long-term and short-term control instructions are disjointed are solved. The problem is solved by constructing a three-layer collaborative architecture of a predictive optimization layer, a real-time coordination control layer and an execution layer: the predictive optimization layer randomly optimizes and generates a reference state track and a frequency modulation capacity instruction of an energy storage unit based on a scene method; the real-time coordination control layer utilizes a deep reinforcement learning coordination controller, synthesizes frequency deviation, SOC compensation signals and frequency modulation capacity reservation instructions, and dynamically distributes active power of a fan and energy storage; and the execution layer realizes rapid issuing of the instruction. The method is mainly used for active power coordination and frequency support of a wind storage combined system in a high-proportion new energy power system, and can effectively delay energy storage life attenuation while stabilizing frequency fluctuation.

The invention discloses a wind power plant voltage and frequency cooperative tuning control method, and relates to the technical field of tuning control, and the method comprises the steps: obtaining the real-time operation data of a wind power plant, carrying out the preprocessing of the real-time operation data of the wind power plant, carrying out the voltage fluctuation and frequency disturbance prediction through a cellular automaton model in combination with the pre-obtained power grid data, and carrying out the voltage fluctuation and frequency disturbance prediction. Obtaining a prediction state matrix; carrying out multi-objective optimization solution in combination with a pre-constructed multi-objective optimization problem and constraint conditions, and obtaining an optimal droop coefficient vector in combination with a preset rule; and the optimal droop coefficient vector is used as a control reference, and voltage and frequency cooperative tuning is carried out in combination with grid-connected point voltage and frequency obtained in real time and communication network topology data. According to the method, prediction is carried out through the cellular automaton model, the rapid and cooperative regulation capability of the voltage and the frequency of the wind power plant is improved, and therefore the urgent demand of a power system for rapid, accurate and cooperative control under the access of high-proportion new energy is better met.

A dynamic frequency coordination control method for asynchronous regional power grids during wet and dry seasons is provided. By using frequency synchronous control in VSC-HVDC, frequency consistency and synchronization between the sending-end and receiving-end grids can be ensured within the range of power adjustment, enabling real-time and automatic sharing of frequency regulation resources between the two grids. Through the use of bilateral frequency limiting control in LCC-HVDC, the frequency regulation effect is enhanced, balancing frequency fluctuations between the sending-end and receiving-end grids. VSC-HVDC adaptive reactive power support control is employed to provide reactive power support to nearby LCC-HVDC, avoiding frequent operations of LCC-HVDC converter transformers and filters during frequency limiting control actions, thereby extending equipment lifespan. Furthermore, by utilizing grid-following and grid-forming control in renewable energy grid integration with additional frequency control, the frequency support capacity of renewable energy generation is improved.

Implementations of the present disclosure relate to a method implemented at a wireless device. In this method, the wireless device transmits first information related to the position, orientation and a part number of the antenna of the wireless device to an automatic frequency coordination (AFC) system, and the part number is related to the radiation pattern envelope (RPE) of the antenna. Then, the wireless device can receive second information related to the RF signal coverage of the antenna from the AFC system, wherein the RF signal coverage is determined by the AFC system based on the received first information and the transmitting power of the wireless device. Then, the wireless device can adjust at least one angle and / or transmitting power of the antenna based on the second information so that the RF signal coverage of the antenna does not overlap with the RF signal coverage of the adjacent antenna.

The invention relates to the technical field of satellite communication transmission optimization, and discloses a multi-band collaborative satellite communication remote data transmission system. According to the system, terminal historical data are processed through waveform decomposition, steady-state and transient characteristics are extracted, and a terminal-level dynamic transmission characteristic spectrum is constructed in combination with real-time parameters. And carrying out feature level comparison on the feature spectrum and ground station measured data, fusing time delay, frequency offset and coding distortion differences to generate a difference fusion spectrum, mapping the difference fusion spectrum to a satellite network topology, and identifying an abnormal propagation path and a corresponding physical region. And then activating multi-frequency-band cooperative monitoring, and completing accurate positioning and self-adaptive response of an abnormal region by adjusting satellite node parameters and applying controllable disturbance. According to the scheme, terminal-level behavior characteristics and network topology mapping are utilized, accurate diagnosis from signal tracing to a space path is achieved, and the accuracy of satellite network transmission anomaly management and the autonomous response capability of a system are improved.

In implementations of the present disclosure, there is provided an approach for an application of access point in the 6 GHz frequency band. A method comprises configuring a mode of the AP as a 6 GHz station mode in a case that the AP is enabled on a 6 GHz frequency band. Then, a list of target APs around the AP working on the 6 GHz frequency band is obtained. Next, the AP selects a target AP from the list of target APs and connects to the selected target AP by setting a power of the AP to be lower than a power of the target AP by a predetermined value. After the AP connects to the target AP, the AP sends a request including global positioning system (GPS) information to an automated frequency coordination (AFC) server via the target AP to obtain a response including allowed power information.

The invention discloses a load frequency coordination optimization control method, and belongs to the technical field of power system load frequency control technologies. The method comprises the following steps: obtaining a frequency response state space model of a hybrid energy storage-containing two-region interconnected power system through mechanism analysis, performing discretization processing, converting the model into a discretization model, and further establishing a discretization prediction model of the system; analyzing constraints existing in the system, and converting the constraints into a linear matrix inequality; and finally, establishing an objective function of the system, performing online rolling optimization on the control quantity, and designing a multi-region controller, thereby realizing a load frequency coordination optimization control effect of the interconnected power system containing hybrid energy storage. The problems of insufficient flexible resources and poor adjusting characteristics of frequency modulation of an electric power system are solved, coordination and cooperation of battery energy storage, pumped storage and a traditional thermal power generating unit are achieved through coordination control, the frequency response performance of the system is improved, the nonlinear constraint problem existing in the system is solved, and potential safety hazards caused by overload work of equipment are avoided.

The invention provides an artificial intelligence-based battery replacement equipment abnormity identification method and device, and relates to the technical field of artificial intelligence. Current and voltage monitoring data are processed through sliding window dual-channel collaborative adaptive normalization, and a normalization feature which retains a transient abrupt change feature and fuses current-voltage coupling information can be constructed; and fine abnormal features are prevented from being weakened. The method comprises the following steps: constructing discriminant features by combining with a fusion time-frequency spectrum of normalized features, quantifying contribution weights and characterization capabilities of different features in corresponding stages by mining an energy coupling and phase coordination rule of a time-frequency joint domain, and determining high-discriminant features with both time-frequency coordination and stage frequency identification; and false and missing report risks are reduced from the source. And finally, the abnormal score is quantified based on the high-discrimination characteristic, and an identification result is output, so that early discovery, accurate positioning and low false alarm of the abnormality of the battery replacement equipment can be realized, the sensitivity and robustness of abnormality identification are improved, and safe and efficient operation of the battery replacement process is ensured.

This invention relates to the field of target detection technology, specifically disclosing a target detection method, device, and storage medium for dedicated railway operation scenarios. The method includes: constructing a training dataset; building a basic target detection model based on the detection accuracy requirements of dedicated railway operation scenarios; optimizing the basic target detection model, including constructing a location-aware space-frequency coordination module in the backbone network to generate a spatial high-frequency saliency map using a dual-stream architecture and local frequency domain changes; constructing a frequency-guided cascaded feature alignment module in the feature pyramid network to guide the geometric offset of the predicted feature map based on the spatial high-frequency saliency map, and deforming and aligning the semantic attention map; and performing multi-round iterative training based on a combined loss function including detection loss and auxiliary constraint loss. The target detection method for dedicated railway operation scenarios provided by this invention can improve the accuracy of detecting small targets in dedicated railway scenarios.

The invention discloses a complex environment pavement crack detection method fusing high and low frequency characteristics. According to the method, effective separation and complementary enhancement of high-frequency information and low-frequency information are realized by using the frequency collaborative enhancement module and adopting a decomposition type feature processing mechanism aiming at the obtained to-be-detected road surface image data, so that the technical problems of low detection precision and reliability in the prior art are effectively solved; the technical effect of accurately detecting the pavement cracks in the complex environment is achieved.

This invention relates to the field of new energy power prediction technology in power systems, specifically a wind power prediction method and system based on time-frequency coordination and adaptive decoupling. The method includes: acquiring historical wind power data; performing complexity-aware adaptive modal decomposition and reconstruction on the data to obtain sets of reconstructed sub-signals of different complexities; inputting each sub-signal set into a heterogeneous feature extraction network for parallel feature extraction to obtain heterogeneous features; adaptively weighting and fusing the heterogeneous features through a dynamic gated fusion network to generate fused features and obtain a preliminary prediction; inputting the preliminary prediction result into a frequency domain closed-loop correction network, correcting its spectrum through a learnable frequency domain filter, and converting it back to the time domain for residual compensation to obtain the final prediction. This invention achieves accurate decoupling, intelligent fusion, and in-depth correction of wind power sequences, thereby improving the accuracy of wind power prediction.

The invention discloses a frequency cooperative control system, method and device for a flexible interconnection low-voltage power distribution network and a medium, and belongs to the technical field of flexible interconnection power distribution networks, and the method comprises the steps: building an equivalent circuit model of the DC side of a multi-end feed-in flexible hub switch, calculating the impedance analytical expression of each converter and DC capacitor, and calculating the impedance analytical expression of each converter and DC capacitor; obtaining a quantitative index for measuring the stability margin of the direct current side of the system; if not more than 0, positioning a direct current side unstable link and optimizing control parameters of the direct current side unstable link; if gt; and if yes, completing the parameter design, and applying the control parameter to the frequency cooperative control of the flexible interconnection low-voltage power distribution network. According to the method, the internal interaction stability of the device is evaluated by constructing quantitative indexes, weak links of the stability can be positioned, control parameters are optimized in a targeted manner, and the overall operation stability is effectively improved; meanwhile, when frequency deviation occurs in the power distribution network on one side, power absorption or release of the internal energy storage device can be regulated and controlled on the premise that normal operation of the power distribution network on the other side is not interfered.

Aspects of the subject disclosure may include, for example, providing a standard request for usage of one or more frequencies to an automated frequency coordination (AFC) system, where the request includes a location of a low power indoor transmitter that is a subject of the request. The aspects may include receiving data identifying at least one frequency channel and a power limit for the at least one frequency channel from the AFC system, where the at least one frequency channel and the power limit are determined by the AFC system to reduce interference with existing standard power access points based on the location of the low power indoor transmitter. The aspect may include providing the data identifying the at least one frequency channel and the power limit to the low power indoor transmitter. Other embodiments are disclosed.

A dynamic frequency coordination control method combining frequency synchronous control in VSC-HVDC and bilateral FLC in LCC-HVDC includes: when a disturbance occurs in a system, the frequency synchronous control in VSC-HVDC is preferentially used to stabilize a grid frequency, and a power adjustment output by the frequency synchronous control in VSC-HVDC is taken as an activation criterion for the bilateral FLC control in LCC-HVDC; when the power adjustment exceeds a preset limiting range and a system frequency deviation exceeds a control dead zone of the bilateral FLC control in LCC-HVDC, the bilateral FLC control in LCC-HVDC is used to determine and output the power adjustment for LCC-HVDC; based on the power adjustment for LCC-HVDC, an additional reactive power control of VSC-HVDC is utilized to provide additional reactive power to LCC-HVDC to regulate a voltage stability of a grid.

Devices, systems, methods, and processes for hybrid line-of-sight (LOS) / non-line of sight (NLOS) detection are described herein. To facilitate co-existence and co-operation of a fixed network and a wireless network sharing a same frequency band without interference, a device in the wireless network can be configured to perform automatic frequency coordination (AFC). The device can accurately determine a geolocation of the device by utilizing global navigation satellite system (GNSS) data and light detection and ranging (LiDAR) data. The device can also determine whether the fixed station is in the LOS by utilizing the GNSS data and the LiDAR data. The device can further correct the geolocation and improve an accuracy of the LOS / NLOS detection by using both: the GNSS data and the LiDAR data simultaneously. The device can further control an output power when the fixed station is in the LOS, thereby avoiding the interference.

Opportunistic power grant, and specifically to providing opportunistic power grants to Access Points (APs) by an Automated Frequency Coordination (AFC) may be provided. An Access Point may be operating in a low power mode. The AP may connect to a STA and send a token to the STA, wherein the token includes a request for a STA location. The AP may receive the STA location in response. The AP may send the token and the STA location to an AFC. The AP may then receive instructions to operate in a standard power mode from the AFC. The AP may change operation to the standard power mode in response.

The invention discloses a wireless broadband ad hoc network and a signal transmission method, and belongs to the technical field of wireless communication. A wireless broadband ad hoc network comprises a physical layer processing module, an intelligent antenna module, a network layer control module and a security encryption module. And the physical layer processing module adopts a coding orthogonal frequency division multiplexing technology and is combined with adaptive modulation and coding to suppress multipath interference. The intelligent antenna module realizes beam forming and spatial multiplexing based on multiple input multiple output. And the network layer control module realizes self-organizing multi-hop and dynamic topology reconstruction by optimizing a routing algorithm, and inhibits bandwidth attenuation in combination with a frequency reuse-space time division multiplexing technology. The security encryption module provides information source and channel dual encryption. All the modules are deeply coordinated, an integrated system with space-frequency coordination, multi-hop stable transmission and anti-interference is constructed, the transmission distance, networking flexibility and anti-interference capability are effectively improved, and the requirements of emergency communication, unmanned systems and other scenes for high bandwidth, low time delay and reliable and safe communication are met.

Interoperable transmit power envelope (TPE) signaling with automatic frequency coordination (AFC) frequency response can be provided. First, AFC information can be received. Next, a mask can be determined for the puncturing channel indicated in the AFC information. Then, it can be determined that the mask needs to be changed to achieve a first amount of AFC response for the puncturing channel indicated in the AFC information. Then, a transmit power envelope (TPE) value can be reported for the puncturing channel, which includes the first amount plus a second amount.

In implementations of the present disclosure, a solution for requesting an AFC response is provided. An access point (AP) collects a first number of location samples of the AP from a positioning system and determines a location range of the AP based on the first number of the location samples and sends the location range to a server for frequency coordination. If a location of the AP is unchanged, the AP may receive at least one available channel and power from the server. If the location of the AP is changed, the AP may collect a second number of location samples of the AP from the positioning system, and update the location range of the AP based on the second number of location samples. In this way, the time for obtaining the authorized channel and power by Federal Communications Commission (FCC) can be reduced.

In one embodiment, a device determines a physical location of a mobile client of wireless network. The device performs a frequency lookup for the mobile client from an AFC service using the physical location of the mobile client. The device selects a frequency to be used by the mobile client based on the frequency lookup. The device causes the mobile client to use the frequency to communicate with the wireless network.

Disclosed are techniques for wireless communication. In an aspect, an access point (AP) queries two or more height determination geolocation services and uses the smallest reported vertical uncertainty for an automated frequency coordination (AFC) process. In an aspect, portions of an uncertainty region that are above the tallest building in the uncertainty region are ignored during an AFC process. In an aspect, portions of the uncertainty region that are not within a building footprint are ignored during an AFC process. In an aspect, portions of an uncertainty region that are above the height of a specific building in which a particular calculation point is located are ignored during an AFC process.

The invention discloses a wind power plant frequency cooperative control method and device, and the method comprises the following steps: building a frequency modulation capability evaluation model of wind turbine groups based on a Koopman operator, and obtaining a limit droop coefficient of each wind turbine group; based on a consistency algorithm, carrying out self-adaptive correction on the droop control coefficient of each fan in the group to obtain a corrected dynamic droop control coefficient of each fan; when it is judged that the frequency of the wind power plant fluctuates, each fan adjusts and outputs active power according to the dynamic droop control coefficient, active output is increased when the frequency is reduced, active output is reduced when the frequency is increased, and overall frequency modulation response of the wind power plant is achieved through collaborative optimization of the fans in the group. The method accurately evaluates the frequency modulation capability through a data driving mode, dynamically corrects the droop parameters, can prevent the fan rotating speed from exceeding the limit and quitting the frequency modulation, remarkably improves the frequency modulation response precision of the wind power plant and the frequency stability of the power system, and is suitable for the primary frequency modulation optimization of the power system under the high wind power permeability.

The present application relates to the field of new energy technology, in particular to a three-machine virtual synchronous generator frequency coordination control method and system, the method comprises: obtaining the control data of each VSG in the three-machine VSG island system; real-time calculation of the frequency deviation coupling term between multiple machines, generating a virtual dynamic mutual damping torque compensation; combined with the rolling optimization characteristics of MPC control, taking the reasonable interval of frequency convergence to the rated value as the target, building a multi-objective cost function, outputting the optimized active reference power; through the synergistic effect of virtual dynamic mutual damping and MPC, the frequency coordination control is realized. The present application solves the problems of serious frequency deviation, excessive transient fluctuation and poor multi-machine synchronization of three-machine VSG system, not only enhances the frequency disturbance rejection ability of multi-machine system, but also realizes the precise control of frequency, improves the operation stability, synchronization and economy of three-machine VSG island system.

Successive interference mitigation in Automated Frequency Coordination (AFC) may be provided. A plurality of messages may be received from a respective plurality of Access Points (APs). Each of the plurality of messages may indicate a respective channel used by a respective one of the plurality of APs associated with the message. An indication may be received that an Interference to Noise (I / N) ratio is above a predetermined threshold in a Fixed Service (FS) channel associated with an FS. At least one of the plurality of APs may be identified as a cause of the I / N ratio being above the predetermined threshold in the FS channel based on a channel used by the identified at least one of the plurality of APs and the FS channel. An action may be taken against the identified at least one of the plurality of APs to lower the I / N ratio.

The invention belongs to the field of micro-grid control, and discloses a distributed direct current micro-grid secondary control method based on preset time, which comprises the following steps: acquiring a node operation original sequence in a periodic acquisition and time sequence storage mode, analyzing a state feature vector and constructing a node state set; analyzing to obtain a primary droop feature set and a primary operation deviation set; constructing a time constraint error evolution path and determining a preset time error sequence; based on the preset time error sequence and in combination with a neighborhood communication mechanism, generating a distributed secondary regulation quantity; and generating a secondary control instruction based on the distributed secondary regulation quantity in combination with sequence updating, saturation limitation and a soft start mechanism. Through a distributed sequential control means based on predetermined voltage recovery and frequency coordination, the frequency consistency of a plurality of micro-grid systems can be maintained, and significant frequency fluctuation and drift caused by load fluctuation or power supply input abrupt change can be effectively avoided.

Devices, systems, methods, and processes for location discovery of an access point (AP) are described herein. The AP, after a reboot event, is required to transmit a current location for automated frequency coordination (AFC) registration. However, the current location may be unknown to the AP. To address this, a device is provided with a location discovery logic that determines the current location of the AP. The device may receive first neighborhood discovery data (NDD) of the AP after first boot event and may generate an RF proximity map based on the first NDD. The device may receive the second NDD of the AP based on the reboot event. The device may compare the second NDD with the RF proximity map, and if the second NDD matches the RF proximity map, the device may determine the current location to be same as a reference location associated with the RF proximity map.

The application discloses a heterogeneous new energy station frequency coordination support optimization method based on a genetic algorithm, which establishes a frequency response model of a heterogeneous new energy station considering the frequency space-time distribution characteristics, and analyzes the frequency dynamic characteristics of the station. On this basis, considering the frequency dynamic index and frequency modulation cost constraints of the station, a new energy station frequency coordination support optimization method based on a genetic algorithm is proposed. The proposed method comprehensively considers the coordinated optimization of grid-forming network ratio, key control parameters and energy storage capacity configuration. Compared with a typical scheme, the proposed optimization scheme can improve the frequency support effect of the station while reducing the frequency modulation cost, achieving the optimization goal of coordinated improvement of frequency safety and economic benefits.

This invention provides a land classification method and apparatus based on space-frequency coordination and cross-modal fusion. The method includes: acquiring cross-modal remote sensing image data to be classified; preprocessing and classifying the cross-modal remote sensing image data to obtain first modality data and second modality data; inputting the first modality data and second modality data into a trained land classification model, and predicting the land classification result based on the model. The land classification model includes: a first encoder, a second encoder, and a decoder; at each level of the first encoder and the second encoder, a semantic feature focusing module (SFFM) and a cross-modal feature fusion module (CCMF) are embedded, respectively. The method provided in this application effectively improves the accuracy of land classification.

The invention discloses a satellite network multi-satellite access and hopping beam joint allocation method. The method comprises the following steps: step 1, feeding back user state information to a visual satellite with the best channel quality; 2, executing a user access beam and sub-band allocation decision in a scheduling period; step 3, carrying out hopping beam pattern distribution in a scheduling period; step 4, carrying out power distribution on each sub-band of each working beam in each time slot; 5, sending a distribution result of power distribution to each user; and step 6, sending data to the target user according to a distribution result. According to the invention, based on frequency coordination, energy coordination and beam position coordination among multiple beams, users can access sub-bands, hop beam scheduling and satellite power can be distributed in a coordinated manner, communication interference among each beam and each sub-band is reduced, the overall capacity of a satellite system is improved while the fairness of the users is ensured, and the service life of the satellite system is prolonged. High-efficiency utilization of frequency energy is realized, and the problem of optimized resource allocation of a low-orbit multi-beam satellite system is solved.

An AR is disclosed that identifies which channels (or sub-channels) to puncture when performing low power indoor (LPI) mode using information learned from automated frequency coordination (AFC). An AR that is AFC enabled - i.e., communicates with an AFC operator - can receive AFC information regarding incumbents at the AP's location. The AP can compare the power assignments for the incumbents provided in the AFC response to a threshold to determine whether to perform puncturing on the channel containing the incumbent. That is, the AP can use the threshold to determine whether puncturing the channel containing the incumbent when operating in the LPI mode is likely to negatively impact the incumbent.