89 results about "Frequency coordination" patented technology

The invention discloses a wind and light storage adjustment inertia and frequency coordination control method, and belongs to the technical field of new energy grid-connected power generation. The method is used for inertia support and frequency cooperative control of a new energy power station containing wind power generation, photovoltaic power generation, energy storage and a phase modifier, and comprises the steps of system minimum inertia demand evaluation, wind and light storage and adjustment inertia time constant evaluation, calculation of minimum inertia support time needed by the system and a wind and light storage and adjustment inertia distribution strategy. According to the wind and light storage and adjustment inertia and frequency coordination control method, the inertia supporting capacity of a new energy grid-connected system is effectively improved, wind, storage, photovoltaic and phase modifier inertia supporting tasks are effectively distributed, and the system frequency safety setting requirement is flexibly met. By calculating the minimum inertial supporting time, inertial supporting and exiting are carried out in time, power back-filling in the frequency recovery stage is avoided, and the frequency modulation burden of the system is relieved.

The invention relates to the technical field of power system automation, in particular to a climbing-frequency modulation coordinated optimization method and system considering energy storage capacity uncertainty, and the method comprises the steps: building an opportunity constraint model of an energy storage system based on the capacity uncertainty, and enabling the opportunity constraint model to be used for describing a reliable feasible region under the deviation of energy storage electric quantity; establishing an energy storage system linearization model considering a climbing-frequency modulation power unified constraint, and realizing power coupling and sharing constraint description of two types of adjustment services; aiming at the nonlinear characteristic of the gradeability of the thermal power generating unit, establishing a piecewise linearization model of the gradeability by adopting a piecewise linearization method; and establishing a thermal power-energy storage combined climbing-frequency modulation coordinated optimization model, and solving the optimization model by adopting a quadratic programming method to obtain the climbing power and frequency modulation reserve capacity of the thermal power generating unit and energy storage. According to the method, the actual available range of the energy storage system capacity can be dynamically reflected, the electric quantity out-of-limit risk caused by the uncertainty of the energy storage capacity is avoided, and the reliability of the scheduling result is improved.

The invention relates to the technical field of power system stability control, in particular to a new energy station transient voltage and frequency coordination stability control method, which comprises the following steps of: analyzing a transient energy evolution rule of an equivalent synchronous motor and stored energy by constructing an alternating current and direct current hybrid dynamic model and fusing with multi-time scale characteristics; based on dynamic weight matrix optimization and a multi-target coordination control strategy, self-adaptive balance of power distribution is realized; a nonlinear feedback algorithm and a real-time compensation mechanism are designed in combination with the Lyapunov theory, and voltage frequency fluctuation in a disturbance scene is suppressed; establishing a multivariable cooperative control architecture, and dynamically adjusting a power adjustment priority and an inertia time constant through coupling iterative optimization of a source storage cooperative strategy to realize adaptive compensation of a transient energy propagation path; according to the method, the dynamic stability and the anti-interference capability of the new energy station under transient impact are remarkably improved, and safe operation of a high-proportion new energy power grid is guaranteed.

The invention discloses a construction method and a modulation method of a three-port multi-frequency MMC topology based on bridge arm multiplexing, and relates to the technical field of power electronics. The construction method comprises the steps that sub-modules of a traditional double-bridge-arm MMC are integrated and optimized into a three-bridge-arm structure through a current conversion branch, independent energy interaction of three ports is achieved through an auxiliary bridge arm, multi-frequency operation modes of power frequency, frequency division, direct current and the like are supported at the same time, and therefore the utilization rate of the bridge arm sub-modules is increased, and the energy utilization rate of the MMC is increased. And the overall size and the manufacturing cost of the converter are reduced. Based on three-port multi-frequency coordination control and power balance requirements, a modulation method of the topological structure is provided, a multi-frequency coordination modulation strategy is adopted, frequency offset is performed through an auxiliary bridge arm to reduce cross interference of port frequency, and output waveform quality is improved through multi-objective optimized capacitor voltage balance control. And meanwhile, direct-current side faults are effectively eliminated by means of the auxiliary bridge arm.

The invention provides a wind-light-heat-storage large-scale new energy base frequency coordination control method, and belongs to the field of power system active power control, and the method comprises the steps: carrying out the simulation analysis based on a wind-light-heat-storage large-scale new energy base DC sending-out system through a photo-thermal power generation system dynamic model, and obtaining a wind-light-heat-storage large-scale new energy base frequency coordination control model; analyzing the frequency modulation energy of the network-following type energy storage and the network-constructing type energy storage, constructing a wind-light-heat storage frequency response model, performing difference analysis on the response speed, and performing off-line solution to obtain a frequency response characteristic table; frequency modulation resources under different operation conditions are researched, and a coordinated output relation is obtained; deviation calculation is carried out to obtain a real-time deviation result, strategy matching is carried out by utilizing a frequency response characteristic table, a frequency modulation strategy is obtained and optimized in combination with a coordinated output relation, and a completely distributed frequency control strategy is obtained; according to the invention, reliable interaction of heterogeneous resource operation states in the primary frequency modulation scale and reasonable distribution of power output are realized.

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.

The invention discloses an island micro-grid frequency coordination control method based on flywheel and battery hybrid energy storage, and provides a hybrid energy storage coordination control method for solving the problem that a diesel generator in an island micro-grid is low in inherent response speed and difficult to deal with rapid load disturbance in time. The method combines the advantages of a flywheel energy storage system (FESS) and a battery energy storage system (BESS) to construct a multi-time-scale frequency regulation mechanism: the FESS is responsible for absorbing or releasing a high-frequency power component and quickly responding to instantaneous fluctuation; the BESS bears an intermediate-frequency power component and realizes medium-term energy regulation; and the diesel generator compensates the low-frequency power component and maintains long-term steady-state operation. Through the multi-unit collaborative hierarchical control, the frequency stability and the operation reliability of the island micro-grid are remarkably improved, the dynamic regulation pressure of the diesel engine is reduced, and the frequent charge-discharge cycle of the battery is reduced, so that the service life of the energy storage system is prolonged.

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.

The invention discloses a power grid frequency coordinated regulation and control method and device based on coordination of three defense lines, and the method comprises the steps: carrying out the control cost analysis, constructing an interconnected power grid active frequency response model based on the control cost analysis, and building an active frequency response control strategy of coordination of the three defense lines on this basis, wherein the three defensive lines comprise prevention control, emergency control and correction control, and finally, a target function is constructed by taking the minimum total cost of the three stages of prevention control, emergency control and correction control as a target, so that the optimization space for coordinated operation of the three defensive lines for power system frequency stability is improved, and the control target of safety and economy coordination is further realized. The relationship between the control cost and the system frequency safety is coordinated, and the purpose of safe and economic cooperative control of the alternating-current and direct-current hybrid system for the frequency stability problem is achieved.

The invention relates to the technical field of wind power plant frequency support, and discloses a frequency coordination control method and system suitable for a non-array wind power plant in a complex terrain. Through multi-direction wake flow modeling and energy storage dynamic compensation technology, cluster energy storage optimization and complex terrain adaptability design are combined to realize full-period power regulation and control. According to the method, a multi-direction wake flow coupling model is established, and the frequency supporting precision is improved; an energy storage dynamic compensation mechanism is introduced, low-frequency oscillation is suppressed, and the frequency recovery time is shortened; an economic constraint-based cluster energy storage capacity optimization algorithm reduces the energy storage configuration cost; a terrain shielding effect compensation algorithm is developed, wake flow errors are reduced, and complex scene adaptability is enhanced; a full-period power smooth regulation and control strategy is constructed, the frequency recovery rate is larger than or equal to 0.3 Hz / s, and secondary drop is controlled within 0.05 Hz. The frequency supporting capacity and the system stability of the wind power plant under the complex terrain are remarkably improved, meanwhile, economical efficiency and reliability are considered, and the method is suitable for a power system with high-proportion renewable energy access.

Devices, systems, methods, and processes for establishing peer-to-peer (P2P) networks over Wi-Fi extended spectrum. P2P networks often encounter challenges in meeting their bandwidth requirements, resulting in degraded performance, slower data transfer rates, or even connectivity issues. Therefore, by delegating frequency channels in the Wi-Fi extended spectrum for establishing P2P networks, at least some challenges faced by the P2P networks can be overcome. Access points (APs) in automated frequency coordination (AFC) infrastructure may coordinate with network devices intending to establish P2P connections and may allocate unused or underutilized channels in the Wi-Fi extended spectrum to these network devices for establishing the P2P connections. The APs may set usage conditions on the allocated channels which the network devices and the APs monitor once the P2P connections are established. The APs may further monitor network traffic on the allocated channels and allow concurrent P2P connections on the same channel to improve channel utilization.

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.

This disclosure provides systems and methods for use of automated frequency coordination (AFC) to manage transmission power and frequencies. In some implementations, a device transmits, to a network entity, an AFC request. The device receives, from the network entity, an AFC response, the AFC response including an AFC power level indication of one or more nearest neighboring entities. The device sets a transmit power of the device based at least in part on the AFC power level indication of at least one of the one or more nearest neighboring entities, and the device transmits at the transmit power. In some instances, the device transmits a first number of AFC requests during a first instance of travelling along a path and transmits a second number of AFC requests less than the first number of AFC requests during one or more successive instances after the first instance of travelling along the path.

Systems and techniques are provided for providing a country determination service and a unified request handler for AFC. For example, a computing device can receive, from an access point (AP), an application programming interface (API) request associated with an automated frequency coordination (AFC) inquiry, wherein the API request includes location information indicating a location of the AP. The computing device can transmit, to the AP, an API response including at least an indication of a country in which the AP is located and an address associated with an AFC service for the AP.

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 frequency coordination control method based on a doubly-fed wind field and a flexible direct-current power transmission system, and solves the problems that the frequency modulation capability of a doubly-fed fan is limited and parameters of the flexible direct-current system are solidified through adaptive virtual inertia control of the flexible direct-current system and a layered optimization strategy of the doubly-fed wind field. According to the method, the kinetic energy reserve of the rotor is maximized before the fault, the control parameters are dynamically adjusted after the fault, the system frequency stability under the high wind power permeability is remarkably improved, and the method has the engineering practical value.

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.

A method includes performing a first iteration of automatic frequency coordination (AFC) using a first error tolerance and geospatial coordinates of a first access point at a venue to determine a first number of channels allowed for the first access point, and performing a second iteration of AFC using a second error tolerance and the geospatial coordinates of the first access point to determine a second number of channels allowed for the first access point. The first error tolerance is lower than the second error tolerance. The method further includes instructing the second access point at the venue to perform AFC using the second error tolerance instead of the first error tolerance in response to determining that a difference between the first number and the second number satisfies a threshold.

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.

Described herein are devices, systems, methods, and processes for optimizing automatic frequency coordination (AFC) queries based on a location-specific likelihood of success. An intermediate service provides a metric or score to determine whether and how to perform a query to the AFC system for a given location. The AFC query metric provided by the intermediate service can be used to determine whether to perform the AFC query, how to prioritize queries, and / or how to adapt the query rate based on the likelihood of success. The system can learn from previous queries and utilize artificial intelligence or machine learning processes in the generation of the AFC query metric. Other relevant data can also be utilized for the generation of the AFC query metric. The number of AFC queries can be reduced based on the utilization of the AFC query metric. Accordingly, costs associated with the AFC queries can be reduced.

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.

Secure device location sharing may be provided. Over a secured link, an indication that a peer-to-peer device desires Automated Frequency Coordination (AFC) based location sharing may be received. Then, from the peer-to-peer device over the secured link, an identity provider (IdP) may be received for the peer-to-peer device. Next, validation of the peer-to-peer device may be requested from the IdP. From the IdP in response to requesting validation of the peer-to-peer device from the IdP, authentication for the peer-to-peer device and an indication that the peer-to-peer device needs AFC based location sharing may be received. An indication that the peer-to-peer device is approved for AFC based location sharing may then be sent to the peer-to-peer device over the secured link.

Techniques for using automatic frequency coordination (AFC for short) in a wireless communication network are described in the present invention. A network controller of a wireless communication network may receive spectrum availability information for operating a plurality of access points (APs) for Wi-Fi communications, the spectrum availability information being obtained by the plurality of APs according to a location of the plurality of APs or a location of the network controller. The network controller further configures a plurality of APs of the wireless communication network to perform Wi-Fi communication based on the spectrum availability information.

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.