277 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 belongs to the technical field of power distribution network voltage regulation and control, and discloses a distributed photovoltaic complex power prediction-cluster-cooperation-based power distribution network voltage regulation and control method, which integrates photovoltaic historical data, inputs an improved back propagation neural network model and outputs predicted photovoltaic active power output. Estimating the reactive capacity boundary of each node in real time based on the running state of the network-following inverter; dividing a distributed photovoltaic cluster by establishing a two-dimensional modularity function of a net load index and an equivalent electrical distance; a multi-device differential cooperative control strategy is provided for the voltage out-of-limit risk in the cluster; and constructing an optimization function with minimum network loss and voltage offset as a target, and optimizing and solving the function by using an improved multi-organization particle swarm optimization algorithm to obtain a multi-device adjustment sequence and a device action amount. According to the method, the renewable energy consumption capacity is improved and the network loss is reduced while the voltage stability of the power distribution network is ensured, and the comprehensive adjustment cost is optimized.

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 equipment maintenance, in particular to a distribution box remote diagnosis and maintenance system which comprises a voltage deviation detection module, a node hot stacking identification module, a channel stability classification module, a contact aging trend evaluation module and a period adjustment trigger module. According to the method, peak value change of effective voltage in each channel period in the distribution box is collected and compared with a preset criterion so as to accurately identify an abnormal discharge unit and accurately position a potential risk channel, and the change rate of equivalent series capacitance, contact conductance and contact resistance of a node is continuously sampled in a non-power-on state so as to accurately identify the potential risk channel. According to the method, multi-parameter same-trend change characteristics are determined, the contact aging process is accurately evaluated by integrating the parameter trend, the node trend and the maintenance plan period remaining time are subjected to cross comparison, the maintenance task advance opportunity is automatically judged, the maintenance plan is actively adjusted, the node fault missing detection risk is effectively reduced, and the maintenance timeliness and accuracy are remarkably 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.

The invention relates to the technical field of power electronics, in particular to a direct-current charging pile insulation monitoring method and system, and the method comprises the following steps: monitoring the voltage deviation between a branch and a bus in real time, adjusting a measurement compensation parameter, correcting a branch insulation resistance measurement value, recognizing leakage current drift, positioning a leakage branch, triggering relay control, and sending alarm information. And generating a charging pile monitoring record. According to the method, the branch voltage deviation trend and the voltage compensation parameters are combined, the branch voltage measurement consistency is improved, the insulation resistance fluctuation is utilized to compare and correct the observation error, the measurement precision is optimized, the current deviation compensation in the no-load state is adopted to eliminate the zero drift interference of the sensor, and the measurement accuracy is improved. A current jump amplitude and a voltage direction are combined to identify an electric leakage branch, positioning accuracy is enhanced, a relay control and event information linkage mode is used, alarm response and equipment state records form a closed loop, and real-time performance and integrity of system monitoring are improved.

The invention relates to the technical field of power grid monitoring, in particular to a distributed photovoltaic operation state evaluation and grid-connected switch control method and system, and the method comprises the following steps: obtaining bus voltage values before and after a photovoltaic unit is connected, collecting voltage measurement values of the photovoltaic unit in different power output states, and calculating voltage variation; and calculating the voltage offset in unit time, and generating voltage offset change data. According to the invention, based on voltage change trend extraction and adaptive classification analysis, in combination with voltage stability coefficient calculation, the adaptive capacity of the photovoltaic unit under different load conditions is quantified, voltage and frequency coupling analysis is introduced, and the coupling characteristics of the photovoltaic unit are graded. And a steady-state voltage range and a frequency deviation interval allowed by the power grid are dynamically adjusted, so that a grid-connected safety boundary meets actual operation requirements, stable grid connection is ensured when safety conditions are met, and the adaptive capacity of the power grid to distributed photovoltaic access is enhanced.

Methods, systems, and devices for establishing memory system read window budget (RWB) are described. A memory system may receive a command from a host system requesting an RWB for an edge of a distribution of a logic level of a set of logic levels. The memory system may determine an expected pattern of data corresponding to a set of memory cells and may store the expected pattern in memory. The memory system may perform a voltage sweep operation, including setting a read voltage to different levels across the edge for reading the set of memory cells. The memory system may count a quantity of expected bits resulting from a logic function of the expected pattern and the read data for each level, and may output a voltage offset corresponding to level at which a difference of the quantity of expected bits and an initial quantity satisfies a threshold.

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 an electric ship standby battery control strategy based on improved droop control. The electric ship standby battery control strategy comprises the following steps: step 1, constructing a cooperative work model of an electric ship standby battery and a main battery; 2, improving a traditional droop control strategy through a translation droop curve, and achieving power equalization; step 3, based on the improved droop control strategy in the step 2, compensating voltage offset by using a fuzzy algorithm to improve the voltage control precision; and 4, accurately distributing the output current of each direct current bidirectional converter through output current information interaction between the main battery direct current bidirectional converter and the standby battery direct current bidirectional converter. According to the electric ship standby battery control strategy based on improved droop control, the output power of the standby battery can be rapidly and accurately adjusted according to the real-time operation state of the electric ship, and the electric ship standby battery control strategy has the practical application value for maintaining the voltage and frequency stability of a ship electric power system and improving the comprehensive utilization efficiency of energy.

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.

The invention discloses a common voltage compensation circuit, a driving circuit and a display device, and the common voltage compensation circuit is used for compensating the common voltage of a display panel, and comprises a common compensation voltage generation module and a common compensation voltage output control module. The common compensation voltage generation module generates a common compensation voltage according to a feedback voltage on a common voltage feedback line in the display panel and a preset common voltage; the common compensation voltage output control module generates a control signal according to a rising edge and / or a falling edge of a high-frequency signal in the display panel to control the common compensation voltage generated by the common compensation voltage generation module to be output to a common voltage wire in the display panel. The accuracy of the common voltage feedback signal is ensured mainly according to the rising edge and / or the falling edge of the high-frequency signal, and the phenomena that the coupled common voltage feedback signal is output to the display panel after being amplified, common voltage offset is caused, and transverse grains are generated are avoided.

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 hybrid distribution transformer fusing an on-load tap changer and a series-parallel converter and a voltage control method, and belongs to the technical field of intelligent power distribution. The hybrid distribution transformer comprises a primary winding, a secondary main winding, a secondary series winding, an on-load tap changer, a series-parallel converter and a unified coordination controller, the parallel side of the parallel converter is connected to the output end of the secondary main winding, and compensation voltage is injected into the series side of the parallel converter through the secondary series winding. The voltage control is based on a voltage deviation and three-phase voltage unevenness hierarchical decision-making method, and the low-speed large-range voltage regulation of the on-load tap changer and the rapid and accurate compensation of the series-parallel converter are dynamically coordinated. The method has the high capacity advantage of an on-load tap changer and the quick response characteristic of a power electronic device, can synchronously solve the problems of long-term voltage deviation and instantaneous voltage fluctuation in the power distribution network, reduces the equipment cost and maintenance cost, and is suitable for voltage stabilization and electric energy quality optimization of the intelligent power distribution network.

The invention describes a driver circuit for supplying a constant current to an LED arrangement (LED1... LEDN) formed by a buck converter comprising a current measurement resistor (Rsense) in series with a coil (Lbk) that measures the current through the coil (Lbk). A two-point control circuit turns on or off the first switching element (Qh) as a function of a measured current (Vsense) flowing through the coil (Lbk) in order to keep the average current flowing through the LED arrangement (LED1... LEDN) constant. A current amplifier circuit (A sense) is connected to a current measurement resistor (R sense) to detect a current (V sense) flowing through the current measurement resistor, and positive and negative currents can be measured by superimposing an offset voltage (V offset) applied to one of its inputs by an offset voltage source. An output terminal of the current amplifier circuit is connected to an input terminal of the two-point control circuit. The offset voltage (V offset) is also superimposed on its threshold voltage (V peak, V valley). Furthermore, a start-up pulse circuit (Vstart-up) is provided, which is connected to the control input of the first switching element (Qhs) via a diode (Dstart-up).

The invention relates to the technical field of power supply fault monitoring, in particular to a method for monitoring the working state of a power supply in a high-temperature environment and a high-temperature power supply, and the method comprises the steps: integrating the difference between a voltage deviation value and a difference value of temperature data in all time periods within a preset duration before each moment; determining a first fault factor according to the voltage deviation values of all time periods and a fusion result of the voltage deviation values of all time periods; and analyzing the average distribution of the high-frequency ripple energy in all the time periods and the similarity between the vibration characteristic value and the ripple coefficient in all the time periods, determining a second fault factor, and determining a comprehensive fault factor of the high-temperature power supply at each moment in combination with the first fault factor so as to monitor the working state of the high-temperature power supply. The problem that the abnormal working state of the high-temperature power supply is difficult to accurately capture because the stability of the power supply system is monitored only through the ripple signal integral value is solved, and the sensitivity of early fault monitoring of the high-temperature power supply is improved.

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.

The invention provides a method, a device and equipment for determining a voltage deviation value of a control voltage threshold. The method comprises the following steps of: determining a control voltage threshold corresponding to each storage unit in a page according to a chip type of a nonvolatile memory; setting each control voltage threshold by using the initial voltage deviation value, and determining an initial reference value corresponding to the page; determining a target control voltage threshold from the control voltage thresholds according to a polling mode, setting the target control voltage threshold by using a preset voltage deviation value, setting other control voltage thresholds by using the initial voltage deviation value, and determining an adjustment reference value corresponding to the page; if the adjustment reference value is smaller than the initial reference value, determining that the target control voltage threshold is a preset voltage deviation value; otherwise, setting the target control voltage threshold as a preset voltage deviation value determined in the previous iterative search optimization operation; and then returning to execute the iterative search optimization operation. According to the method, the voltage deviation value of the control voltage threshold can be efficiently determined.

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 invention relates to a power distribution network collaborative optimization operation method and device and a medium, and the method comprises the steps: a day-ahead global optimization stage: constructing a day-ahead source-network-load-storage collaborative optimization model, and taking the minimization of the day-ahead total operation cost containing the green certificate transaction cost as an optimization target, day-ahead scheduling is carried out on a distributed power supply, an interconnection switch, an interruptible load, a transferable load and a three-terminal intelligent soft switch containing energy storage in the active power distribution network; and an intra-day rolling optimization stage: constructing an intra-day rolling optimization model, and performing intra-day scheduling on a switchable capacitor and a three-terminal intelligent soft switch containing energy storage in the active power distribution network by taking the minimum intra-day total operation cost containing voltage offset cost as an optimization target. Compared with the prior art, the day-ahead-intra-day two-stage collaborative optimization method is provided based on the dynamic response characteristics of the equipment, the refinement level of a scheduling scheme is remarkably improved through layered progressive optimization, and the consumption rate of new energy is greatly improved.

The present invention relates to the technical field of voltage control, and specifically discloses a distributed new energy substation area voltage control method and system, including: obtaining the phase angles of all access nodes at all sampling moments based on all real-time data of all access nodes; obtaining the power loss values of all access nodes at all sampling moments based on the phase angles of all access nodes at all sampling moments, and obtaining the voltage offset values of all access nodes at all sampling moments based on all real-time data of all access nodes at all sampling moments; obtaining the node analysis matrix of all access nodes and the voltage control result of the new energy substation area based on the power loss values of all access nodes at all sampling moments and the voltage offset values of all access nodes at all sampling moments. The present invention reduces the losses generated when all access nodes in the new energy substation area are connected, and efficiently improves the stability of the power grid in the new energy substation area.

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.