745 results about "Power limits" patented technology

The invention relates to a V2G-based alternating current charging power adjusting method and device. The method comprises the following steps: carrying out multi-scale data acquisition and preprocessing on a V2G alternating current charging system to obtain a standardized system state data set; constructing a system dynamic model comprising a power grid voltage characteristic and a charging power characteristic; carrying out decomposition to obtain a power output mapping relation calculation, and obtaining a power modulation control parameter; establishing a fast and slow time scale coordination control framework, and designing a power regulation agent and a voltage regulation agent to obtain a coordination control strategy; checking a charging power limit value constraint, a voltage limit value constraint and a power factor constraint to obtain a constraint violation judgment result, and executing constraint projection calculation to obtain a target control instruction; and controlling a power conversion circuit of the charging pile to execute power regulation operation. According to the invention, a hierarchical control structure is adopted, the control complexity of the system is reduced, and the robustness and the adaptive ability of the control strategy are improved.

The invention discloses a self-generating and self-using distributed photovoltaic power station power anti-countercurrent control method and system, and relates to the technical field of photovoltaic anti-countercurrent control, and the method comprises the steps: obtaining the real-time load power of a grid-connected point of a power grid and the output power of a photovoltaic inverter, and calculating the net load power deviation; when the net load power deviation is smaller than a preset countercurrent risk threshold value, it is judged that a countercurrent risk exists, and an anti-countercurrent adjusting instruction is generated; in response to the anti-countercurrent regulation instruction, dynamically correcting the maximum output power limit value of the photovoltaic inverter, and synchronously activating the charge and discharge compensation mode of the energy storage system; an anti-countercurrent control coefficient is calculated, and the power reduction proportion of the photovoltaic inverter and the compensation power of the energy storage system are synchronously adjusted based on the anti-countercurrent control coefficient, so that the power flow of the grid-connected point of the power grid is kept to be zero or forward flow; according to the method, dynamic and accurate cooperation of photovoltaic reduction and energy storage compensation power in time and magnitude is realized, and the efficiency of a self-generating and self-using distributed photovoltaic power station is improved.

The invention discloses a power matching-based current limiting method, system and equipment for a network construction type flexible direct current system. Relates to flexible direct current transmission. An existing current limiting method affects system stability and control accuracy. The current limiting condition is equivalently converted into the power limiting condition under the characteristic that the output voltage of the grid-forming converter is stable, the power limiting condition is converted into the angular frequency judgment condition under the characteristic of droop control, and when the angular frequency of the system is smaller than the lower limit of the angular frequency threshold value, it is judged that the system has overcurrent under large disturbance, and then the system is controlled. And the power matching module is connected, the output power of the converter is limited to be the maximum value, and then the current is limited to be the maximum value allowed to be output by the converter. According to the technical scheme, the current limiting effect of the converter can be achieved on the premise of not changing the network construction type frequency modulation control characteristics, complex parameter measurement and setting are not needed, the potential operation scene of the flexible direct current system can be effectively dealt with, and safe and reliable operation of the network construction type flexible direct current system is ensured.

The invention provides a method and system for achieving elevator energy feedback data communication. The method comprises the steps that multi-modal data are collected, and fault features are extracted, encrypted and packaged; and after decryption, phase deviation of elevator operation and power grid voltage is calculated by utilizing an algorithm, a current phase is synchronously fed back, and a feedback instruction is generated. Uploading the harmonic suppression parameter to an energy center, calculating a demand, generating a region-level feedback strategy, dynamically distributing a feedback power upper limit, synchronizing the harmonic suppression parameter, and obtaining region-level feedback data. And aggregating feedback data, and setting a global optimization target, including cost minimization, feedback maximization and carbon emission reduction. And calculating feedback energy and carbon integral according to a target adjustment algorithm, automatically settling to an operator account, and adjusting the target of the next period. Through an algorithm and an optimization mechanism, the problem of energy waste of a brake resistor in a traditional feedback technology is solved, the feedback efficiency is improved, and energy waste is reduced.

The invention relates to a sodium electric energy storage system dynamic partition power control method based on string type cluster level management, which comprises the following steps of: firstly, realizing physical isolation of battery clusters through a string type framework, configuring an independent power conversion module and a cluster level controller for each cluster, acquiring voltage, current, SOC (state of charge) and SOH (state of health) of each cluster in real time, and on the basis of the data, in a discharging or discharging process, determining the state of charge of each cluster; a dynamic partition strategy and automatic adjustment of power distribution are realized according to inter-cluster SOC, SOH, voltage range, temperature range, power limit and other differences, and an energy storage system is dynamically divided into a high-energy high-health area, a high-energy medium-health area, a medium-energy high-health area, a medium-energy medium-health area, a low-energy or sub-health area and a fault early warning area in a discharging and charging mode; and rapid balance of electric quantity among clusters is realized through the converter module, so that power distribution is ensured to meet power grid requirements, overcharge and overdischarge of batteries are avoided, and the service life of a battery system is prolonged.

The invention provides a charging pile dynamic power regulation and control system and method based on multi-parameter coupling. Belongs to the field of charging of charging piles, and comprises the steps that when the total power of a bus reaches a load reduction threshold value, a phase cooperative load reduction strategy is activated, a multi-stage response mechanism is configured through a safety control execution unit, peak clipping and valley filling control is implemented in the time periods t1-t2, and a total load curve is smoothed through time shifting power distribution; and when the power is close to the power limit, the power of the non-emergency charging pile is automatically reduced to a safety threshold, and the equipment utilization rate is intelligently improved in a load sufficient period. And the concurrent access number of the charging piles is maximized on the premise that the bearing limit of the phase lines is not exceeded. The user capacity under the rated load of the charging station is improved, the user charging cost in the time-of-use electricity price period is reduced, the utilization rate of electric power resources is improved, millisecond-level power adjustment response is achieved, the full-time-period compliance of dynamic load limitation on the power grid side is ensured, and the operation benefits, safety and reliability of charging infrastructures are remarkably improved.

Methods and systems for managing power consumption in data processing systems are disclosed. The power consumption in the data processing systems may be managed by obtaining power limits for the data processing systems. The power limits may be determined by computing the power limits from regularly updated parameters of the data processing systems. The data processing systems may include data processing systems that are housed in racks. From the regularly updated parameters, rack power limits may be obtained. Using the regular parameters and the rack power limits, data processing system power limits may be obtained for the data processing systems.

A method for performing mapping between one or more radio modules and one or more radiofrequency (RF) groups includes: separating the one or more radio modules into the one or more RF groups according to one or more messages, wherein the one or more messages comprise a previous TX power ratio, a TX power ratio margin, one or more weighting information, one or more TX performance indices, one or more receiving (RX) performance indices, one or more configurations, or one or more usage scenarios; accumulating RF exposure of the one or more radio modules to at least one RF group among the one or more RF groups; and determining at least one transmitting (TX) power limit corresponding to the at least one RF group according to accumulated RF exposure of the at least one RF group.

The invention discloses a power grid frequency regulation and control method for a low-inertia power system, and the method comprises the steps: taking the minimum lowest point of the power grid frequency in fluctuation as a first regulation and control target based on frequency response models constructed by frequency modulation resources in the low-inertia power system, taking the lowest total frequency modulation cost of the frequency modulation resources as a second regulation and control target, taking the condition that the lowest point of the fluctuating power grid frequency meets the security constraint as a first constraint condition, and taking the condition that the generated power output by each frequency modulation resource meets the power limit as a second constraint condition; taking a third constraint condition that the total amount of the generated power output by each frequency modulation resource meets the total power requirement of the low-inertia power system, solving to eliminate the frequency deviation and the generated power output by each frequency modulation resource, and the frequency modulation resources comprise a synchronous generator set, a network construction type virtual inertia device and a network following type virtual inertia device. Collaborative optimization of various frequency modulation resources can be realized, and complex dynamic power system requirements can be met.

The invention provides a request power control method, electronic equipment and a vehicle, which can determine the limit of battery performance through the available power of a battery in different current running states to obtain the available power of a motor. And the available power of the motors is distributed in different driving modes, so that the available distribution power of each motor can be determined. And performing power reservation on the available distribution power through the corresponding target reserved power so as to avoid the overvoltage or undervoltage risk of the battery. The limit of the motor performance is determined through the maximum allowable power of the motor, then the actual maximum power is determined according to the maximum available power and the maximum allowable power, and the actual maximum power is the value of the maximum allowable request power under the motor performance limit and the battery performance limit. And the request power converted by the request torque can be ensured to reduce the damage to the battery and the motor according to the actual maximum power limit request power.

A microgrid system includes an electrical bus including at least one electrical load; at least one non-energy storage system asset configured to supply electrical power to the electrical bus; an energy storage system group including: two or more energy storage system assets configured to supply electrical power to the electrical bus, and a system controller operatively coupled to each of the assets on the electrical bus. The system controller is configured to: determine characteristic energy set points and power limits for each of the assets; determine that at least two or more assets have a same priority for power distribution; determine the characteristic power set points for the non-energy storage assets, dispatch the energy storage system assets having the same priority by treating a dispatch for the energy storage system assets as a combined asset.

A method of charging an energy storage system of a wind turbine is provided. The wind turbine includes a power generation system and a power delivery interface. The method includes obtaining a maximum power limit to which electrical power supplied to the external system via the power delivery interface is limited; monitoring an amount of electrical power provided from the power generation system to the power delivery interface or an amount of power generatable by the power generation system; and determining if a predefined condition is met. If the predefined condition is met, the wind turbine is operated in a charging mode in which electrical power generated in addition to a first amount of electrical power is supplied from the power generation system to the energy storage system to charge the energy storage system. The first amount corresponds to a power rating of the wind turbine.

The invention discloses a control method of a hybrid power system, the hybrid power system and a hybrid excavator. The control method of the hybrid power system comprises the steps that the required power of a hydraulic system, the required power of an electrically-driven rotation system and the current electric quantity of an energy storage module are obtained; the total demand power of the system is calculated according to the demand power of the hydraulic system and the demand power of the electric drive rotation system; determining the working mode of the hybrid power system according to the size relation between the total demand power and a first preset value and the size relation between the current electric quantity of the energy storage module and an electric quantity limit value; when the hybrid power system is in the heavy load mode, the generator motor is controlled to provide power for the hydraulic system; and when the hybrid power system is in the light load mode, the generator motor is controlled to convert part of kinetic energy generated by the engine into electric energy to charge the energy storage module. The system reliability can be enhanced, energy consumption and emission are reduced, and efficient utilization of energy is achieved.

A method for improving transmission power management with compliance to regulations of radiofrequency exposure, which may comprise: at a current time, estimating whether a window average power, which may reflect average power transmitted using a radio technology during a moving time window, will exceed a power limit after the current time; if true, proceeding to at least one of a first handling subroutine and a second handling subroutine to set a power cap, and causing power transmitted to be capped by the power cap after the current time. The first handling subroutine may comprise: scheduling to set the power cap lower at a scheduled time. Estimating whether the window average power will exceed the power limit may involve discarding one of a plurality of power records. The second handling subroutine may comprise: setting the power cap not higher than the discarded one of the plurality of power records.

The invention discloses an event-triggered micro-grid distributed economic dispatching method considering a main power grid, and belongs to the field of energy-saving and environment-friendly economic dispatching of intelligent power grids. According to the method, the situation that whether the micro-grid is connected into the main power grid or not is fully considered, the more general incremental cost model is established, the finite time consistency economic dispatching algorithm triggered by the distributed event is designed, and the incremental cost of the generator is finally consistent under the condition that the topological structure is kept switched through the algorithm. Meanwhile, an auxiliary variable is introduced, the auxiliary variable is updated by applying a finite time consistency economic dispatching algorithm, and then the increment cost is updated by applying the auxiliary variable, so that the optimal increment cost and the output power of the generator can be obtained under the power limitation of the generator. In addition, when the micro-grid is connected into the main grid, the algorithm can enable the micro-grid to output power required by the main grid. According to the invention, economic dispatching can be carried out on the micro-grid under the condition of switching the topological structure within finite time, and meanwhile, power required by a main power grid can be output by being connected into the main power grid.

The invention discloses a new energy utilization rate evaluation method based on an electric power spot market, and belongs to the technical field of new energy station power generation. Related information published by a transaction center is acquired, and then the loss rate is calculated from two perspectives of published power and published price according to actually and specifically acquired data information; therefore, the overall utilization rate of the new energy is further calculated, the disadvantage that the traditional evaluation of the power limiting rate or utilization rate is disjointed with the power transaction is avoided, the objectivity and practicability of the evaluation are improved, and the misjudgment risk is reduced by integrating the information of the two perspectives. And finally, calculating the year-on-year ratio and the ring-on-ring ratio of each loss rate to the overall utilization rate of the new energy, and reasonably evaluating the future income of the new energy station within a certain time duration.

The present application discloses a photovoltaic power station inefficiency mode recognition method, device, equipment and medium, which relates to the photovoltaic power station detection technology field, including: preliminarily judging whether the photovoltaic power station is a preliminary inefficient power station according to a first inefficiency judgment value obtained based on the daily equivalent power generation hours and the daily equivalent power generation hours standard value and a second inefficiency judgment value obtained based on the current daily power generation rate and the standard power generation rate; if it is a preliminary inefficient power station, judging whether the consecutive days for which the photovoltaic power station is determined as a preliminary inefficient power station exceeds a preset number of days, if it exceeds, the preliminary inefficient power station is an inefficient power station; evaluating the inefficient mode loss rate of the inefficient power station through an inefficient mode evaluation model so as to determine the reason why the inefficient power station is in the inefficient mode based on the inefficient mode loss rate; the inefficient mode loss rate includes the component tilt angle loss rate, the component spacing loss rate, the component pollution loss rate, the equipment failure loss rate and the power restriction loss rate. It can accurately determine the inefficient power station and determine the inefficiency cause and inefficiency degree of the inefficient power station.

The invention discloses a heating energy consumption adjusting method and device, equipment and a storage medium, and the method comprises the steps: obtaining continuous multiple historical stroke data and current stroke data, and the historical stroke data is the stroke data of a sleep wake-up cycle; calculating a thermal management power limiting amplitude, a weighted temperature coverage coefficient and a battery heating coverage rate according to the multiple historical travel data and the current travel data, and obtaining a first initial threshold value and a second initial threshold value of thermal management; and then calculating a dynamic heating coefficient and a power limit value according to the current stroke data, the thermal management power amplitude limit, the weighted temperature coverage coefficient, the battery heating coverage rate, the first initial threshold value and the second initial threshold value, and then adjusting the heating energy consumption according to the dynamic heating coefficient and the power limit value. By dynamically adjusting the dynamic heating coefficient and the power limit value, the energy consumption of the whole vehicle at low temperature can be effectively reduced on the basis of ensuring the performance.

The invention discloses a charging and discharging strategy optimization method for a battery swap station. The method comprises the steps of S1, collecting historical battery swap requirements, battery inventory states and time-of-use electricity price data of the battery swap station; s2, constructing a battery replacement demand prediction model with online parameter updating capability, and outputting a battery replacement demand sequence of a plurality of time steps in the future in a prediction time domain in a rolling manner; s3, calculating the minimum safe inventory required to be maintained for satisfying future service in the prediction time domain, and further determining a dynamic safe operation interval of the battery inventory state; s4, constructing a charging and discharging strategy optimization problem with operation economy as a target, and generating an optimal power decision by combining battery inventory dynamics and power limitation; and S5, solving the charging and discharging strategy optimization model, obtaining a charging and discharging power decision sequence in a prediction time domain, entering a next time step, and repeating the steps S2 to S5. According to the method, the future demand is converted into the inventory hard constraint reflecting the service capability, so that the operation cost is minimized on the premise of ensuring zero interruption of the battery replacement service.

A motor control device is provided in a vehicle equipped with a plurality of motors connected to a battery. The motor control device includes processors corresponding to the motors respectively. Each of the processors derives first power, derives second power, transmits information indicating the second power to another processor, acquires information indicating the second power derived by the another processor, derives third power, acquires fourth power, acquires a power limit value of the battery, derives a control power limit value, distributes the control power limit value to the motor corresponding to the own processor based on an axle torque ratio of the plurality of motors, derives an individual power limit value of the battery for the motor, derives a power correction amount of the first power, corrects the torque instruction value of the motor corresponding to the own processor, and operates the motor according to the corrected torque instruction value.

The invention discloses a charging power dynamic control method and a charging device, and relates to the technical field of charging control, and the method comprises the steps: obtaining a current temperature value and a temperature change rate of a battery in real time, and calculating theoretical required power through combining preset target full charge time and the current temperature value; and the system can more accurately master the real-time state and the charging demand of the battery. Meanwhile, based on a preset temperature safety threshold value, a dynamic power limiting parameter is generated by utilizing the current temperature value and the temperature change rate, the thermal state of the battery is reflected in real time, and the safety of the charging process is ensured. The system adjusts the charging power in real time according to the dynamic power limiting parameters and the theoretical required power, so that the charging efficiency is ensured, and potential safety hazards such as battery overheating are effectively avoided. Besides, when the temperature of the battery is abnormal, the charging power is dynamically adjusted according to the temperature difference value through a sectional type charging power adjusting strategy, so that the battery is protected from being damaged by high temperature, and the charging experience is optimized.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information indicative of a carrier aggregation configuration associated with a first component carrier (CC) and a second CC. The UE may receive scheduling information indicative of at least one scheduled transmission during a transmission occasion associated with at least one of the first CC or the second CC. The UE may transmit, using at least one transmission power during the transmission occasion, at least one communication on the at least one of the first CC or the second CC. The at least one transmission power is based at least in part on a maximum transmission power limit and a power headroom (PHR) reference value that is determined independently of the maximum transmission power limit. Numerous other aspects are described.

The invention discloses an operation method for improving the utilization rate of a battery discharge power supply for an electro-tricycle, which belongs to the technical field of battery application, and comprises the following steps: S1, electrifying the electro-tricycle, and judging whether a battery type has a communication type through an MCU (Microprogrammed Control Unit), S2, when the battery does not have a communication function, judging whether a current voltage value is greater than a power limit point, and if yes, judging whether the current voltage value is greater than the power limit point; s3, when the battery has a communication function, calculating a battery under-voltage value and a power limiting point according to the number of battery strings, the MCU limits the input power according to the battery voltage provided by the BMS, the SOC and the allowable maximum continuous discharging current, the electric quantity is judged according to the battery voltage, a power reducing point is set, the input power of the MCU is limited, the electric energy utilization rate of the battery discharging tail end is improved, and meanwhile, the battery under-voltage value and the power limiting point are calculated according to the battery string number. In order to realize the soft undervoltage function, the MCU needs to accurately sample the bus voltage, and parameters such as the SOC of the battery and the maximum allowable continuous discharge current are obtained through the communication bus to limit the input power.

According to the doubly-fed wind turbine generator fault ride-through control method and system provided by the invention, a refined interval segmentation mechanism based on a voltage amplitude is introduced, reactive power coefficients under different falling or lifting depths are dynamically adjusted, and reactive power limits of the rotor-side converter and the grid-side converter are combined, so that the fault ride-through control of the doubly-fed wind turbine generator is realized. Reactive power optimal distribution of rotor side priority and network side auxiliary coordination is realized; furthermore, active feed-forward compensation is introduced to the grid side to quickly suppress DC bus voltage fluctuation, and a dynamic amplitude limiting strategy based on a current circle is adopted to the rotor side, so that the risks of rotor overcurrent and DC overvoltage are effectively suppressed while the power grid voltage recovery is supported in a full-force manner, and the reliability of the system is improved. Therefore, the ride-through capability and the operation safety of the doubly-fed wind turbine generator in the power grid fault period are remarkably improved, and reliable technical guarantee is provided for avoiding large-area off-grid of the generator.

The present invention relates to a comprehensive analysis method and system for the matching between loss-of-excitation protection and excitation limitation of a generator. The method comprises: acquiring basic parameters of a generator set; performing power plane calculation on each protection and limitation condition on the basis of the basic parameters, so as to obtain data under a power plane of each protection and limitation condition; acquiring preset operating condition data; performing calculation on the basis of the preset operating condition data and the data under the power plane of each protection and limitation condition, so as to obtain a reactive power limit value corresponding to each protection and limitation condition; and performing comprehensive analysis on the matching between loss-of-excitation protection and excitation limitation on the basis of the reactive power limit value corresponding to each protection and limitation condition. The present invention can implement a complex logic calculation related to the rapid and automatic conversion of loss-of-excitation admittance, an impedance circle and a power circle, thus replacing the original manual complex calculation, and significantly improving the calculation efficiency; and the present invention can also implement comprehensive analysis for the matching between loss-of-excitation protection, low excitation limitation, a generator power limit and a stator overcurrent limitation, thus greatly improving the predictability of a risk during a test process and the accuracy of test data.

The invention provides a fault protection and dynamic limited power control method and system for a 48V electronic water pump. The fault protection and dynamic limited power control method comprises the steps that the preset real-time working current and the real-time pump body temperature of the 48V electronic water pump are obtained; performing weighted fusion calculation on the real-time working current and the real-time pump body temperature to generate a comprehensive state index; comparing the comprehensive state index with a preset water pump reference operation range to judge whether a preset grading response mechanism is triggered or not, and generating a judgment result; when the judgment result is that the grading response mechanism is triggered, calling a power limiting mode corresponding to the comprehensive state index from a preset mode mapping table; and the power limiting mode is applied to adjust the driving power of the preset 48V electronic water pump, and a preset fault protection strategy corresponding to the power limiting mode is executed. According to the invention, refined fault protection and power management of the 48V electronic water pump are realized, the problem of excessive response or insufficient response of a traditional single threshold protection mode is avoided, and the adaptability and reliability of the system under complex working conditions are improved.

A system includes a traction battery and a controller. The traction battery includes first and second arrays of battery cells. The controller is programmed to implement first and second filters, such as first and second bar-delta filters, configured to respectively generate output indicative of a state-of-charge (SOC) of the first and second arrays from models of the first and second arrays. The controller is further programmed to charge and / or discharge the traction battery according to power limits defined by the SOC of the first and second arrays.

The described technology is generally directed towards implementation of an electric vehicle (EV) as an energy generator for a vehicle to grid (V2G) power discharge operation. Energy available at a battery onboard the EV can be discharged to an electrical grid, e.g., via an electric vehicle supply equipment (EVSE) / wallbox. The EV can receive a power limit parameter (PmonitoringDischargePowerLimit), defining a maximum amount of power that can be transferred during a V2G operation. Communication between the EV and EVSE can be in compliance with ISO 15118-20, and comprises a ChargeParameterDiscoveryResponse message. The power limit is in accordance with VDE-AR-N 4105. A power value in a ChargeLoopResponse message can be utilized as a real time measurement of power transferred between the EV and the EVSE, and generated in compliance with ISO 15118-20. If the power value equals the power limit parameter, electrical energy transferred in the V2G operation can be reduced.

The invention relates to a method for preventing thermal runaway of a battery through reinforcement learning. The method comprises the following steps: extracting time series features from collected battery operation states and environment detection information (S1); predicting a thermal runaway risk of the battery based at least on the extracted time series features (S2); the reinforcement learning agent determines, as action, a strategy for intervening in battery thermal runaway based on states including the predicted risk of thermal runaway, a vehicle power limiting state, a battery insulation unit state, a battery cooling system state, and a vehicle operating state (S3). The application also relates to a battery management system, a vehicle and a computer program product. According to the method and the device, the reinforcement learning agent performs dynamic decision optimization on the thermal runaway risk of the battery under various complex working conditions, and the battery safety and the vehicle performance are balanced through a reward mechanism, so that the influence on the vehicle output power and the endurance mileage is reduced as far as possible on the basis of ensuring the battery safety.

The invention relates to the technical field of power distribution control, and discloses a power grid interactive charging pile power intelligent distribution method and system, and the method comprises the following steps: 1, obtaining the power limit of a power grid, the capacity of a transformer, the safety margin and a non-charging load, and calculating the station-level distributable power; 2, collecting user target and vehicle state data, and calculating target reference power; step 3, determining physical upper limits in a classified and segmented manner, comparing and marking limits, and grading to obtain urgency indexes and constraint labels; step 4, performing correlation analysis based on the urgency degree and the constraint, generating a target tracking weight and setting a smoothing coefficient; step 5, under the constraint of distributable power, setting and optimizing a single adjustment parameter to obtain final power; and step 6, applying a climbing speed limit, quantifying and issuing a power instruction, monitoring an equipment state and redistributing the equipment state in an off-line state. According to the invention, the fair, efficient and stable distribution of the multi-session charging demand is realized while the charging pile meets the power grid safety.