208 results about "Voltage shift" patented technology

The invention discloses a high-precision voltage measurement method and system based on multi-parameter adaptive compensation, and relates to the technical field of intelligent voltage measurement. The high-precision voltage measurement method and system based on multi-parameter adaptive compensation comprises the steps that S1, voltage signal data and disturbance source characteristic data are collected, preprocessing is completed, and an analysis basis is constructed; s2, analyzing voltage excursion in combination with disturbance current characteristics, and dynamically adjusting a compensation path; s3, evaluating a compensation correction effect, and driving a compensation output strategy in real time; and S4, comprehensively analyzing the offset characteristics and the correction result, judging an abnormal section and triggering adaptive adjustment. The problems that disturbance components cannot be comprehensively extracted from multiple parameters such as PWM modulation frequency, wire harness impedance and working condition load change and a compensation function cannot be reversely constructed in an existing method, and a measured value does not have stability are solved.

The invention relates to the technical field of power supply system management, and discloses a centralized management method and management system for a power supply system. The method comprises the following steps: monitoring a current fluctuation sequence and voltage offset data of each node of a power supply network in a continuous operation period, and collecting an equipment state log text and load change time sequence information; identifying a time point of abnormal sudden change of current fluctuation, and extracting a characteristic parameter set of a power supply quality reduction event in combination with a voltage offset data change amplitude; matching a historical abnormal event library, positioning key operation record fragments strongly related to load change in the log, and generating a mapping relation table of equipment operation behaviors and power supply quality fluctuation through semantic analysis and time sequence alignment; and correcting the parameters of the load prediction model, outputting and executing a power supply priority dynamic adjustment strategy, and triggering automatic calibration of equipment operation parameters. According to the method, comprehensive control of the power supply system is realized, abnormity can be identified and processed in time, association between operation and quality is clear, and stability and flexibility of operation of the power supply system are improved.

The invention relates to the technical field of energy storage equipment monitoring, and discloses an energy storage equipment operation state real-time early warning and supervision method based on an LSTM hybrid model. The method comprises the following steps: firstly, collecting current fluctuation time sequence data, a voltage deviation distribution curve and a temperature gradient evolution graph of the energy storage equipment, and generating a multi-source operation parameter set; constructing a long-short-term memory network dominant capacity attenuation prediction model based on the current fluctuation time sequence data, and constructing a time sequence convolution assisted voltage anomaly identification model based on the voltage deviation distribution curve; then monitoring the capacity attenuation trajectory and internal impedance fluctuation data of the equipment in real time, and dynamically activating the target model to generate a risk early warning instruction; and finally, inputting an early warning instruction into the regulation and control unit, and adjusting a charging and discharging strategy or starting a protection mechanism in real time. According to the method, through multi-source parameter fusion and dynamic model activation, comprehensive and accurate monitoring and quick response of the operation state of the energy storage equipment are realized, and the safety and stability of equipment operation are improved.

The invention relates to the technical field of power systems, and discloses a management and control system for effectively managing and controlling distributed power supply loads based on power grid automation equipment. The system comprises an acquisition module for acquiring dynamic load parameters of a distributed power supply and topological information of a target power grid; the division module extracts load sudden change characteristics and divides the power grid into coordinated regulation and control partitions in combination with topological information; the injection module injects a preset disturbance signal to a time delay sensitive area node in the partition to obtain voltage offset distribution; the positioning module is used for positioning electrical weak nodes according to the oscillation attenuation rate of the electrical nodes and topological connection distribution; a verification module performs gridding ratio verification on the weak nodes and the coordination regulation and control partition to obtain a dynamic boundary constraint condition; an output module reconstructs a distributed power supply power output priority instruction based on the condition. According to the invention, the problems of lagging response and insufficient precision of power grid management and control under large-scale access of the distributed power supply are solved.

Methods, systems, and apparatuses include receiving, by a memory subsystem, a read command from a host device to read data from a memory portion of the memory subsystem. It is determined that the memory portion includes a partial block. A memory bin is determined for the memory portion in response to determining that the memory portion includes the partial block. A position is determined for the memory portion. A voltage offset is applied to a read voltage for the memory portion using the memory bin and the position.

The embodiment of the invention provides a power grid dispatching method based on dynamic frequency security constraint and a program product. The method comprises the following steps: determining system frequency response information of the power system according to hydroelectric generating set frequency response information of the power system, photovoltaic / wind generating set frequency response information of the power system and battery energy storage frequency response information of the power system; the system frequency response information represents response conditions of the power system under different load changes; determining the minimum operation cost and the minimum voltage deviation value of the power system according to the system frequency response information of the power system; wherein the minimum voltage deviation value represents the change condition of the voltage when the power system receives disturbance; and determining a power dispatching strategy of the power system according to the minimum operation cost and the minimum voltage deviation value of the power system. The method is used for achieving the effects of giving consideration to the safety of the dynamic frequency and the steady-state voltage of the system and improving the safety and stability level of the frequency voltage of the island micro-grid.

The invention discloses a low-ripple closed-loop negative-voltage charge pump circuit in the technical field of analog integrated circuits, and the circuit comprises a charge pump closed-loop modulation circuit, the output end of the charge pump closed-loop modulation circuit is connected with the low-ripple negative-voltage charge pump circuit, and the low-ripple negative-voltage charge pump circuit is used for receiving positive power supply voltage input and outputting negative power supply voltage; the low-ripple negative-voltage charge pump circuit comprises a charge pump module, the first end of the charge pump module is connected with the first end of the positive power supply filter capacitor and the output end of the charge pump closed-loop modulation circuit, and the charge pump module outputs an output signal through the first end. By fixing the switching frequency of the low-ripple closed-loop negative-voltage charge pump circuit, the influence of switching noise on the system is reduced without repeatedly starting and stopping or changing the switching frequency of the charge pump, meanwhile, the size of a positive power supply is adjusted in a closed-loop mode through a negative feedback loop, and the voltage of the positive power supply of the charge pump is dynamically compensated. And the output voltage excursion of the traditional charge pump under large current is reduced.

In a microelectromechanical system (MEMS) sensor, movement of a component such as a proof mass due to a force of interest is sensed capacitively. A capacitance-to-voltage (C2V) converter receives a capacitance signal from the sensor and outputs a signal that includes an offset in addition to a signal of interest. The output signal is analyzed to identify the offset portion of the output signal and to modify values one or more variable capacitors coupled to the C2V input reduce the offset portion of the output signal.

The invention discloses a battery management system safety function testing method and device and a medium, and relates to the technical field of battery management system testing, and the method comprises the steps: directionally injecting an overcurrent pulse and dynamic voltage disturbance into a propagation path thermodynamic diagram, and generating a diffusion proportion coefficient and relay response time; calculating a dynamic suppression efficiency value based on the diffusion proportionality coefficient and the relay response time, dynamically judging the ASIL safety level according to the dynamic suppression efficiency value, and generating a three-dimensional space-time thermodynamic diagram; according to the three-dimensional space-time thermodynamic diagram, mapping a voltage offset amplitude, and superposing a BMS response track, constructing a fault probability-suppression efficiency association curved surface, and generating a digital test report; according to the invention, through fusion of multi-source sensing and the evidence theory, dynamic quantification of fault features is realized, high-risk cells are accurately positioned, and the adaptability to complex working conditions is improved.

The invention relates to the technical field of fuel cells, in particular to a fuel cell fault diagnosis and recovery method and device, equipment and a medium, and the method comprises the steps: obtaining a single voltage and an offset difference of a target fuel cell in a preset diagnosis period; obtaining the actual current of the target fuel cell in a preset diagnosis period, and calculating first to fourth diagnosis reference values according to the actual current; judging the fault level of the target fuel cell according to the average monomer voltage, the offset difference and the first to fourth diagnosis reference values; acquiring current operation parameters of the target fuel cell, and judging whether a preset fault type occurs or not according to the current operation parameters and the fault level; when any preset fault occurs, the actual duration of the current fault is obtained, and at least one of the first priority recovery strategy, the second priority recovery strategy and the third priority recovery strategy is regulated and controlled according to the actual duration. Therefore, the problems that an existing fuel cell fault diagnosis method is low in diagnosis progress, and a recovery strategy cannot be further given according to a diagnosis result are solved.

This invention pertains to the design of a novel Gallium Nitride (GaN) High Electron Mobility Transistor (HEMT) with multiple metal contacts to a single contiguous p-GaN island. The invention encompasses various embodiments which introduce innovative mechanisms for threshold voltage (Vth) control through hole injection and removal.

The invention provides a test method and device based on an FRT table, equipment and a storage medium, and relates to the technical field of computers. The method comprises: generating a test sequence; the test sequence can cover the voltage combination in the FRT table; determining a test mode based on the test sequence; the test mode is an index mode or a global mode; reading a corresponding voltage offset in an FRT table based on the test mode and the test sequence; based on the voltage offset, reading the target data from an NAND flash memory of a solid state disk SSD; determining a test result based on the reading state of the target data; the reading state comprises the number of rereading times of the FRT table, the number of hard decoding times of the target data, the number of soft decoding times of the target data and the data recovery time delay. The test efficiency can be improved, the dependence on the environment is reduced, and the fault mode coverage rate is improved.

The application discloses a power distribution network reconstruction and coordinated maintenance model considering voltage deviation, which is used for obtaining a global optimal solution of maintenance scheduling and network topology. The power distribution network reconstruction and coordinated maintenance model is established through the following steps: S01: a model of line maintenance optimization scheduling of the power distribution network is established according to maintenance costs affected by human resources and load states in different time periods; S02: a power distribution network reconstruction model with a target function of minimum network loss and voltage deviation is established according to the operation mode of the power distribution network, and the topology, power flow and voltage constraint of the power distribution network reconstruction are analyzed; S03: coupling constraints of the line maintenance optimization scheduling and the power distribution network reconstruction are established according to line connection state variables and line maintenance variables; and S04: a power distribution network reconstruction and coordinated maintenance model considering voltage deviation is established with a target function of minimum maintenance cost, network loss and voltage deviation. The application can select the optimal operation mode of the system, and effectively reduces the maintenance scheduling and reconstruction cost of the system.

The invention discloses an active power distribution network resource optimization method and system based on operation state perception, and relates to the technical field of resource optimization, and the method comprises the steps: determining a node set in an operation monitoring state, and obtaining the voltage deviation characteristics of each node in a continuous time window and the current fluctuation characteristics of a connected line; generating core regulation and control equipment and adjustable operation intervals and constraint conditions thereof based on the node-line state characteristics, and forming alternative self-healing regulation and control strategies; the node state change and the equipment resource occupation condition after the alternative self-healing regulation and control strategy is triggered are obtained, and an equipment resource load change curve is formed; extracting a resource occupation fluctuation index and accumulated resource consumption, and generating a resource consumption data set; and optimizing the self-healing operation sequence based on the resource consumption data set, generating an equipment resource optimization scheme, and executing the self-healing operation in sequence, thereby realizing dynamic resource optimization configuration of the active power distribution network, and improving the utilization efficiency of equipment and the self-healing capability of the system.

Receivers, control systems, and methods for receiving a signal. The method includes receiving a differential communication signal comprising a first component and a second component. The method also includes generating a comparison signal with a comparator by comparing the first and second components. Furthermore, the method includes generating an unbalanced communication signal by applying a debounce time to the comparison signal. Finally, the method includes inverting a voltage offset of the comparator based on the unbalanced communication signal.

This invention relates to the field of power electronics technology, specifically to a method and system for monitoring the insulation of DC charging piles. The method includes the following steps: real-time monitoring of branch voltage deviation from the busbar; adjusting measurement compensation parameters; correcting the measured value of branch insulation resistance; identifying leakage current drift; locating the leakage branch and triggering relay control; sending alarm information; and generating a charging pile monitoring record. In this invention, the consistency of branch voltage measurement is improved by combining branch voltage deviation trends with voltage compensation parameters. Observational errors are corrected by comparing insulation resistance fluctuations, optimizing measurement accuracy. Current deviation compensation under no-load conditions eliminates sensor zero-point drift interference. Leakage branch identification is achieved by combining current jump amplitude and voltage direction, enhancing location accuracy. Relay control and event information linkage are used to form a closed loop between alarm response and equipment status recording, improving the real-time performance and completeness of system monitoring.

A system includes a memory device and a processing device, operatively coupled to the memory device. The processing device determines a reference temperature value for a block family while the block family is open and measures a temporal voltage shift (TVS) value of a voltage level within one or more memory cells of the block family. The processing device determines a threshold voltage offset bin based on the reference temperature value and the TVS value and reads data from any page of the block family via application of a threshold voltage offset, specified by the threshold voltage offset bin, to a base read level voltage.

Embodiments of a compensation circuit for a power amplifier (PA) and a method of PA compensation are disclosed. In an embodiment, a compensation circuit for a power amplifier (PA) includes an envelope detector configured to measure an input power of the PA and a bias offset generator configured to apply a voltage offset in response to the input power of the PA to generate bias voltages that are applied to back gates of transistor devices of the PA for distortion compensation and second harmonic (HD2) compensation of the PA.

The application provides a data re-reading method, device and equipment, applied to the technical field of data storage, which comprises the following steps: when data is read from a flash memory, if the error code rate exceeds the error correction range value, a first offset voltage parameter group is obtained from a preset re-reading table, and the target data page is re-read by using the first offset voltage parameter group. If the re-reading fails, the target data page is subjected to voltage threshold distribution scanning processing, and a second offset parameter set of the target data page is obtained. The second offset parameter set is compared with the first offset parameter set to determine the voltage offset direction. According to the voltage offset direction, the target re-reading offset voltage item is searched for in the optional offset voltage items, the second offset voltage parameter group is determined, the target data page is re-read by using the re-reading offset voltage item, and the re-reading table parameter is updated, so that the problems of flash memory performance decline, high dependence on historical experience and relatively limited calculation of optimal voltage threshold in the current data re-reading process are solved.

This application provides a converter circuit and a control method for the converter circuit. The converter circuit provided in this application includes a converter module and a control module. The control module is used to detect the voltage parameters of the converter module and determine the voltage deviation based on the voltage parameters; determine the current zero-sequence component coefficient based on the voltage deviation; and determine the modulation waveform based on the current zero-sequence component coefficient, so as to drive the converter module using the modulation waveform. The converter circuit of this application associates the current zero-sequence component coefficient with the voltage parameters. When voltage changes are caused by system startup, shutdown, load abrupt changes, etc., only the current zero-sequence component coefficient is adjusted to quickly and smoothly switch between SVPWM and DPWM under these conditions, improving system switching efficiency and dynamic response capability.

The present application belongs to the field of electric digital data processing, and particularly relates to a load replacement attack defense method and device based on topology switching and power flow regulation. The defense method solves the optimal joint deployment strategy by constructing a double-layer Stackelberg game model for cooperatively defending the load replacement attack by integrating intelligent soft switches and remote control switches, wherein the upper defense model plans to comprehensively consider the constraint conditions such as voltage regulation, power flow balance, radial network structure and continuity, so as to minimize the equipment investment-operation cost and voltage out-of-limit index; in the lower attack model, the optimal attack strategy of the resource-limited attacker is generated under the given defense strategy of the defender to maximize the voltage deviation. The problems that the traditional topology switching-based defense method has response lag, limited regulation capacity, and the mitigation strategy of deploying only intelligent soft switches faces high deployment cost and poor defense effect are solved.

The present disclosure relates to inductor current shunt linear control techniques for mitigating DC-DC regulator load dump transients. For inductor-based DC-DC converters, a current shunt switch can provide a backup path for inductor current that does not include the output capacitor. An amplifier circuit can be included and coupled with a control node of the current shunt switch to adjust a voltage on the control node to control the amount of inductor current shunted from the output node. A fast linear loop can be included to ensure smooth transitions when turning on or off the current shunt switch. These techniques can minimize the subsequent negative output voltage excursion and duration when the final value of a step-down load transient is not zero, depending on the specific ESL and ESR values of the output voltage capacitor. These techniques can improve the positive output voltage response caused by output load transients in the negative direction.

The application provides a power converter, a controller, a power supply system and a midpoint voltage deviation control method, which are applied to the technical field of power electronics, and the power converter comprises a power conversion module, a main control module and at least two DC bus capacitors, each DC bus capacitor is connected in series between the positive electrode of a DC bus and the negative electrode of the DC bus, and since the midpoint voltage deviation suppression strategy in the related art can only achieve good midpoint deviation suppression effect when the bus voltage is high, the main control module increases the bus voltage when the voltage deviation between the capacitance voltage of at least one DC bus capacitor and the target capacitance voltage is greater than the first preset deviation threshold, thereby providing guarantee for the midpoint voltage deviation suppression strategy to achieve better midpoint deviation suppression effect, improving the midpoint deviation suppression effect and significantly improving the stability of the power supply system.

The invention relates to an intrinsic temperature measurement for cross-temperature handling in a memory device. A system includes a memory device; and a processing device operably coupled with the memory device to perform operations including: measuring a read temperature metric associated with a segment of the memory device; estimating a read temperature based on the read temperature metric; determining a cross-over temperature value based on the read temperature and the write temperature; determining a set of crossover temperature voltage offsets associated with the crossover temperature values; and associating the set of cross temperature voltage offsets with the segment of the memory device.

The invention relates to the technical field of intelligent energy storage, in particular to an intelligent energy storage system based on source-grid-load storage integration, which comprises a power supply state evaluation module, a power grid constraint judgment module, an energy storage adaptation capability calculation module, a collaborative scheduling strategy matching module and an instruction execution consistency verification module. According to the method, the predictability of new energy output is enhanced by analyzing the wind power and photovoltaic power change rate in real time and extracting the average output of a stable interval as a reference, and a safe scheduling path is screened based on the power grid node load and voltage offset condition, so that scheduling failure caused by node overrun is avoided; according to the method, participating objects are accurately screened in combination with the charge state, temperature and discharge capacity of an energy storage unit, a clear scheduling capacity boundary is constructed, the response efficiency is improved, the energy storage capacity and a load gap are matched and judged, dynamic strategy adaptation under multiple scenes is achieved, the actual response and instruction consistency of a converter is verified, and it is guaranteed that a closed loop is accurately executed.

Driver control circuit (51-54, 61-63) for a power semiconductor element (100) having a control terminal (101), the driver control circuit comprising: a driver (3) for causing a voltage shift at the control terminal in response to a turn-on command or a turn-off command; a detector (4, 15, 16) configured to detect an electrical quantity (Vg, Ig) of the control terminal; a delay signal generator (5) configured to generate a delay signal (dVG, dVig) by adding a delay time to a detection signal (VG, Vig) of the electrical quantity detected by the detector; a subtractor (6) configured to generate a difference signal (VD, VDig) between the detection signal and the delay signal; and a short-circuit condition detector (7) configured to detect a short-circuit condition in the power semiconductor element based on a comparison result between the difference signal and a reference value (VR1, VR2) when the driver is operated in response to the turn-on command.

A non-volatile memory is capable of suspending a programming process before completion to perform a read (or other) process. When resuming the suspended programming process, a magnitude of a next program voltage pulse is set to be a voltage magnitude of a previous program voltage pulse plus a nominal increment adjusted by a voltage offset in response to the programming process being suspended for greater than a first time period. The magnitude of the next program voltage pulse is set to be the voltage magnitude of the previous program voltage pulse plus the nominal increment in response to the programming process being suspended for less than the first time period. The voltage offset and the first time period are set based on usage of the non-volatile memory (e.g., based on number of program-erase cycles performed).

This invention discloses a multi-objective optimization method for flexible distribution systems based on reward decoupling normalization reinforcement learning. This method constructs a multi-objective deep reinforcement learning model based on group reward decoupling normalization strategy optimization to perform multi-objective optimization scheduling for complex constraints in flexible distribution systems, such as renewable energy fluctuations, load changes, and scheduling resource coordination. The method designs the three objectives—minimizing operating costs, minimizing voltage offset, and minimizing photovoltaic curtailment—as independent reward functions, guiding the flexible distribution system's operation strategy to focus on multiple dimensions, including economy, environmental friendliness, and safety. The group reward decoupling normalization strategy optimization algorithm independently normalizes each reward, avoiding the collapse problem of multiple reward signals in advantage estimation and effectively preserving the relative differences between the objectives.

The application relates to an intensive transient disturbance regulation circuit, which comprises a three-phase bridge arm unit, a common DC side unit and a zero sequence bridge arm unit; the three-phase bridge arm unit is connected with each phase power supply branch of a three-phase power grid, a common neutral end of the common DC side unit and an input end of the zero sequence bridge arm unit, and an output end of the zero sequence bridge arm unit is grounded; the zero sequence bridge arm unit is used for generating a first current for offsetting a fault zero sequence component based on a power grid voltage, a power grid current and a common neutral end voltage of the three-phase power grid; the three-phase bridge arm unit is used for determining a three-phase reactive compensation current based on the common neutral end voltage and the first current input by the zero sequence bridge arm unit, and sending the three-phase reactive compensation current to a corresponding phase distribution line of the three-phase power grid; and the common DC side unit is used for providing common DC voltage support for the three-phase bridge arm unit and the zero sequence bridge arm unit. The zero sequence disturbance of the distribution network can be inhibited, and the voltage deviation and power fluctuation problems caused by the power grid transient disturbance can be weakened.

The invention relates to the monitoring of an electric current in a power converter, for example a DC-DC converter. For this purpose, a transformer is provided, which is coupled into a current path of the power converter on the primary side. Sensor signals corresponding to the mean value and / or a peak value of the current flow to be monitored can be provided on the secondary side of said transformer. For this purpose, an electrical connection between the secondary side of the transformer and the outputs of the sensor signals is opened when the primary side of the transformer is not energised. During these time intervals, the transformer can be demagnetised in order to compensate for a DC voltage offset in the current to be monitored.