24 results about "Dead band" patented technology

The invention relates to a magnetotelluric dead band data correction method and system based on deep learning, and the method comprises the steps: carrying out the segmentation processing of actually-measured magnetotelluric data, obtaining a plurality of original segments, carrying out the processing of each original segment through a DnCNN-GRU network, extracting a low-frequency effective signal, and separating a high-frequency noise-containing signal; performing identification and classification processing on the high-frequency noisy signal through an IncepTCN network model to identify a first high-quality fragment and a noisy fragment, and performing denoising processing on the noisy fragment through an IVIT network model to obtain a second high-quality fragment; and splicing the first high-quality segment and the second high-quality segment to obtain a spliced segment, and carrying out combination reconstruction on the spliced segment and the low-frequency effective signal to obtain a reconstructed signal. According to the invention, the method can achieve the automation of the whole process from low-frequency protection, noise classification to denoising, can avoid the manual parameter adjustment, and remarkably improves the recognition and suppression precision of complex noise.

A steering control device controls a steering device. The steering device includes a processor configured to execute a dead band amount calculation process and a superposition process. The dead band amount calculation process is a process of calculating a dead band amount using a steering angle as an input, the dead band amount being an amount by which the steering angle changes while a turning wheel does not turn in a steering direction. The superposition process is a process of superposing a dead band compensation torque on the torque of a motor, when the magnitude of the dead band amount is larger than zero. The dead band compensation torque is a torque that increases the torque of the motor in a direction in which the turning wheel turns depending on rotation of a steering shaft.

The utility model relates to the technical field of H-bridge drive circuits, and discloses a high-reliability H-bridge dead-zone generation circuit, which comprises two AND gates for preventing two MOS (Metal Oxide Semiconductor) transistors on the same side of the circuit from being switched on at the same time; the exclusive-OR gate can distinguish input signal directions and output response control signals; the Schmitt trigger is used for converting the curve waveform into a PWM (Pulse Width Modulation) square wave signal and inhibiting noise and interference in an input signal; the RC time delay circuit is connected with the Schmitt trigger and is used for realizing signal delay; the two AND gates comprise a first AND gate and a second AND gate; the first AND gate and the second AND gate are electrically connected with the exclusive-OR gate, and the exclusive-OR gate and the first AND gate are electrically connected with the Schmitt trigger; according to the utility model, the formation of dead zone time is realized through RC time delay and Schmidt characteristics, the condition of circuit damage caused by simultaneous conduction of the H-bridge drive circuit in the working process is avoided, the hardware cost is lower, and the reliability is higher than the reliability realized by software.

The invention belongs to the technical field of power system control, and the method comprises the following steps: improving a manual failure area unit of primary frequency modulation, when a frequency deviation delta F'exceeds a frequency dead zone Ef, increasing a superposition amount for the calculated frequency deviation delta F, and when primary frequency modulation action is carried out, adding a delay filtering link; optimization is carried out on the superposition amount and the delay link for adaptive adjustment, and prediction and multi-stage frequency modulation are carried out during a primary frequency modulation action; and when the primary frequency is reset, a return difference link is added. According to the method, the algorithm of the manual failure area is improved, a step-type frequency superposition amount is added to the calculated frequency difference, and the adjustment amount of frequency modulation is increased, so that the problem of insufficient integration of frequency modulation is overcome; when the frequency deviation is weak, a step type is added to form a larger output signal, the signal output form is a sudden change form, and the dead zone of each link is overcome; time delay and return difference are increased, and frequent jitter which is useless for primary frequency modulation and is caused by frequency crossing of a frequency dead zone edge of a power grid system is prevented.

The invention discloses a network construction type converter control method and system considering a primary frequency modulation dead zone. The method comprises the following steps: determining a relationship between actual output power of a network construction type inverter without the primary frequency modulation dead zone and reference power; according to the inertia demand in the primary frequency modulation dead zone, selecting the mode of the primary frequency modulation dead zone of the network-building inverter; setting a frequency dead zone range, and sampling the frequency of the power grid system; according to the obtained frequency dead zone range and the frequency of the power grid system, whether the frequency of the current power grid system is located in a set frequency dead zone is determined, and signal selection is obtained; according to the selection of a primary frequency modulation dead zone mode of a network-forming inverter, when a primary frequency modulation inertia demand is small, a primary frequency modulation dead zone is realized by adopting an inverter output port voltage frequency measurement method; when the inertia demand of the selected primary frequency modulation is large, a direct current / alternating current side power instruction modification method is adopted to realize a primary frequency modulation dead zone, and the setting of the primary frequency modulation dead zone of the network-forming inverter is realized; and the service life of the energy storage system is effectively prolonged.

The present invention discloses a method and system for generating a dead-zone XOR modulation signal for a grid-connected converter, and relates to the field of power electronics technology. The method generates a shadow signal corresponding to the original signal while a controller generates an original SPWM signal. By adjusting the carrier phase and the modulation wave amplitude, the phase and pulse width of the XOR logic signal generated by the shadow signal can be changed, thereby generating an XOR sinusoidal pulse width modulation signal with a double-sided dead zone, avoiding direct short circuit caused by simultaneous opening of power switch devices in the circuit, improving the reliability of systems such as modular series-parallel grid-connected converters, and having the advantages of being easy to implement, strong versatility, and not increasing hardware.

To detect a dead zone approach of a power transmission system by using information only on a rotational speed of a drive device.SOLUTION: A drive control device of a rotary electric machine for driving a rotary electric machine connected with a load via a torque transmission element having a dead zone has: a torque command acquiring part for acquiring a toque command value of the rotary electric machine; a rotational speed calculating part for calculating a rotational speed of the rotary electric machine; and a storage part for storing the rotational speed calculated by the rotational speed calculating part on and after a first time when a code of the torque command value acquired by the torque command acquiring part reverses. Further, the drive control device has a dead zone start time estimating part for calculating a second time when an amount of change from the rotational speed on the first time firstly becomes a predetermined amount or more to estimate a third time earlier than the second time as the start time of the dead zone.SELECTED DRAWING: Figure 5

The invention discloses a passive laser gyroscope lockout interval control method and a passive laser gyroscope lockout interval control system, and relates to the field of laser gyroscopes, and the passive laser gyroscope lockout interval control method comprises the following steps: measuring lockout intervals in different states by adjusting the light intensity ratio of two beams of incident laser of a passive laser gyroscope; drawing a locking interval curve changing along with the light intensity ratio, performing nonlinear fitting through an expression of a locking threshold value, and obtaining locking intervals corresponding to different light intensity ratios from the fitted curve; and the light intensity proportion of the corresponding incident laser is adjusted to reduce the locking interval. According to the invention, the locking interval can be reduced without introducing additional devices or additional technologies to the passive laser gyroscope, and the rotation angular velocity measurement range of the passive laser gyroscope is enlarged.

To reduce the influence of a dead zone.SOLUTION: The power conversion device 10 includes a primary full-bridge circuit 30 including a plurality of primary switching elements Q1 to Q4, a secondary full-bridge circuit 40 including a plurality of secondary switching elements Q5 to Q8, and a controller 50. The control unit 50 performs phase shift control. The controller 50 derives the first phase shift amount Φ 1 from the current deviation Δ Iout between the target current Itgt and the output current Iout. When the first phase shift amount Φ 1 is included in the range of the dead zone D derived based on the input voltage Vin to the power conversion device 10 and the output voltage Vout of the power conversion device 10, the control part 50 sets the second phase shift amount Φ 2 outside the range of the dead zone as the phase shift amount Φ.SELECTED DRAWING: Figure 1

To provide a monitoring device capable of monitoring an insulation state of electric facilities with higher accuracy than before.SOLUTION: Opening / closing operation of a LBS 22 installed in a high voltage power receiving facilities cubicle 3 can be detected by control means 11. When detecting the opening / closing operation of the LBS 22, the control means 11 sets dead zone time in which no occurrence of a failure is determined even if electromagnetic waves are detected by an electromagnetic detection sensor 21. Therefore, it is possible to monitor an insulating state of the high voltage power receiving facilities cubicle 3 with higher accuracy than before without erroneously detecting the occurrence of the failure related to the insulating state based on detection of the electromagnetic waves radiated due to the opening / closing operation in the LBS 22.SELECTED DRAWING: Figure 2

The application provides a high-voltage level shift circuit with adaptive dead zone, and the level shift circuit comprises a level shift module, a dv / dt noise detection module, a blank signal control module and an output module. The blank-off technology is used to prevent the dv / dt noise from affecting the output through the signal chain. The blank time is adaptively adjusted by the dv / dt noise detection module when facing different dv / dt noises, so that the limitation of the minimum on time of the input signal in the application is solved. A low transmission delay, high dv / dt noise resistance and low minimum input signal on time are obtained, and the application requirements of a DCDC system and a driving circuit system are met.

The application provides a wind turbine dead zone parameter determination method and device, equipment and medium, and relates to the technical field of wind turbine control. In the application, first, a prediction wind speed sequence of a prediction time window, a wind speed dead zone characteristic function, a time dead zone characteristic function and an optimization objective function are obtained; second, an index actual value of a wind speed characteristic index is determined based on the prediction wind speed sequence; then, based on the index actual value, the index actual value of the wind speed characteristic index and the index actual value of a relationship characteristic index in the wind speed dead zone characteristic function and the time dead zone characteristic function are determined by taking minimizing power generation loss as the target; finally, based on the index actual value of the wind speed characteristic index and the index actual value of the relationship characteristic index, the actual value of the wind speed dead zone and the actual value of the time dead zone are respectively determined according to the wind speed dead zone characteristic function and the time dead zone characteristic function. Based on the above, the problem of strong data experience dependence and weak scene adaptability in the existing dead zone parameter determination technology can be improved.

This invention relates to the field of automatic control technology for thermal power units, specifically to a method for eliminating backlash in actuators within a DCS (Distributed Control System). This invention eliminates backlash by designing a corresponding algorithm within the DCS system. Compared to traditional mechanical repair techniques, this method is implemented directly in the DCS system via an algorithm, requiring no cost and being quick. It can eliminate the total backlash even for complex actuators. Currently, most DCS systems can be configured online to eliminate backlash at any time. This method can be widely applied in thermal power units and other fields, significantly reducing delays caused by backlash in actuators and improving the quality of automatic control.

The present application belongs to the technical field of analog circuit power management, and particularly relates to a kind of adjustable dead zone or overlap time generation circuit.The circuit of the present application includes adjustable current generation circuit, delay circuit and comparator.The adjustable current generation circuit provides adjustable charging and discharging current for the delay circuit to determine the delay time, and the comparator shapes the signal passing through the delay circuit into a square wave signal.Under fixed dead zone or overlap time, the efficiency of switching power supply is relatively low or the power tube has the risk of punch-through under certain application conditions.By adjusting the size of the dead zone or overlap time with an external resistor, the efficiency of the switching power supply under all application conditions can be maximized.In addition, the present application realizes structure reuse and current self-compensation technology, thereby improving circuit utilization and implementation accuracy.

The invention relates to the field of noise detection technology, in particular to a swept frequency equalization threshold noise test method for rapid detection of cochlear dead zones, which can measure continuous dead zone results in a large range, solve the problem of isolated test frequency and easy omission of dead zones, and can accurately detect the edge frequency of the dead zone, continuously play the equalization threshold noise, and realize the feedback of hearing or not hearing by continuously pressing or releasing a button, when the subject presses the button, the intensity of the pure tone continuously decreases; when the subject releases the button, the intensity of the pure tone continuously increases, and a sawtooth curve whose hearing threshold constantly fluctuates when masked by the equalization threshold noise is obtained, and the midpoints of each segment of the sawtooth curve are connected to obtain a test result in one direction, and the signal-to-noise ratio of the hearing threshold after masking by the equalization threshold noise is greater than 10dB, and the area where the hearing threshold after masking is 10dB higher than the hearing threshold before masking is determined as the dead zone, and the frequency corresponding to the end point of the curve where the dead zone is located is the edge frequency of the dead zone.

A steering control device (60) controls a steering device (10). The steering device (10) includes a processor (62) configured to execute a dead band amount calculation process and a superposition process. The dead band amount calculation process is a process of calculating a dead band amount using a steering angle as an input, the dead band amount being an amount by which the steering angle changes while a turning wheel (40) does not turn in a steering direction. The superposition process is a process of superposing a dead band compensation torque on the torque of a motor (50), when the magnitude of the dead band amount is larger than zero. The dead band compensation torque is a torque that increases the torque of the motor (50) in a direction in which the turning wheel (40) turns depending on rotation of a steering shaft (14).

The invention relates to an apparatus for controlling a hydraulic machine in a hydroelectric power plant, the hydraulic machine comprising a wicket gate, and the apparatus having a device for performing an emergency shut-off, the apparatus being characterised by low energy consumption and high efficiency while meeting all operation-relevant and safety-relevant requirements of a hydraulic machine, and being suitable for continuous control operation without a dead band.

The application discloses a SiC inverter modulation method based on secondary frequency modulation and double modulation waves, initializes system parameters, sets a reference switching frequency, a spread spectrum modulation frequency, a dead time and a nonlinear threshold of secondary frequency modulation, executes a secondary frequency modulation algorithm, performs phase accumulation based on a real-time switching frequency to generate a variable-frequency triangular carrier signal, executes basic SVPWM calculation, executes dynamic double modulation wave generation logic, and generates complementary drive pulses. The application effectively reduces the residence probability of the switching frequency at the extreme value, reduces the peaks at both ends of the frequency spectrum, makes the noise energy more evenly distributed in the entire frequency band, and thus obtains a better EMI suppression effect. Through the double modulation wave technology, the offset amplitude of the modulation wave is adjusted online according to the real-time frequency, and the accurate compensation of the dead zone error caused by the frequency change is realized. No matter how the switching frequency changes, the physical dead time of the system output is always locked at the set value.

The invention discloses a modulation method of a pulse width modulation signal and equipment thereof. The modulation method of the pulse width modulation signal is applied to a three-level converter circuit. The modulation method of the pulse width modulation signal comprises the following steps: acquiring a low-frequency carrier signal based on a sinusoidal modulation wave signal; obtaining a redundancy value of a low-frequency switching tube in the three-level converter circuit, and generating a modulation ratio signal of the low-frequency switching tube based on the redundancy value and the sinusoidal modulation wave signal; and generating a pulse width modulation signal based on the modulation ratio signal of the low-frequency switching tube and the low-frequency carrier signal. Through the mode, the modulation method of the pulse width modulation signal can realize modulation of the pulse width modulation signal of the three-level converter circuit on a low-speed processor under the condition that a relatively small zero crossing dead zone is ensured, and only one switching tube of the three-level converter circuit performs switching action at each moment; therefore, the noise interference caused by the switching action of the switching tube in the three-level converter circuit is reduced.

A source / sink LDO is provided with a pre-amplifier that pre-amplifies an error voltage equaling a difference between an output voltage and a reference voltage. The resulting pre-amplification reduces the dead band for the source / sink LDO by the gain of the pre-amplifier.

The application discloses an implementation device of a configurable dead zone circuit. A dead zone control register receives and stores configuration data. A predetermined factor and a dead zone amplitude are output to a predetermined module, an enable signal is output to a dead zone counter module, and the dead zone amplitude is output to an output logic module. The predetermined module generates a frequency division signal according to the dead zone amplitude and the predetermined factor. The dead zone counter module controls the loading of a counting initial value in the dead zone counter module according to the frequency division signal, and counts when the enable signal is valid to obtain a counting signal. The output logic module compares the dead zone amplitude and the counting signal, and outputs a dead zone value according to a comparison result. The application changes the dead zone time according to the value of the configuration register, is convenient for synchronous timing inspection and verification, has small area and low power consumption, is convenient for implementation on a chip, and enhances the practicability of embedded application. When the application is used to configure the dead zone value, the processing flow is simple, easy to control, and the real-time change of the dead zone value can be realized.

The invention provides a primary frequency modulation dead zone-containing dynamic parameter optimization method and device, a medium and equipment, and relates to the technical field of new energy grid-connected primary frequency modulation, and the method comprises the steps: determining frequency deviation time domain solutions of ordinary and step frequency modulation dead zones; for an ordinary frequency modulation dead zone, calculating a first moment of the lowest point of the frequency, and obtaining a first maximum frequency deviation and a first steady-state frequency according to the first moment; for a step-type frequency modulation dead zone, a second moment of the lowest point of the frequency is also calculated, and then a second maximum frequency deviation and a second steady-state frequency are obtained; determining a frequency modulation correction coefficient by comparing the maximum frequency deviations of the two; and finally, adjusting the first maximum frequency deviation and the first steady-state frequency of the ordinary frequency modulation dead zone by using the coefficient so as to complete parameter adjustment. According to the embodiment of the invention, the challenge on the frequency stability of the power grid system caused by a large number of new energy grid connection is perfected, the frequency deviation after disturbance of new energy grid connection is reduced, and the stability of the power system is improved.

The invention provides a method and device for determining an optimal primary frequency modulation dead zone of multi-type frequency modulation resources, and the method comprises the steps: obtaining a primary frequency modulation simulation model which corresponds to a target regional power grid and comprises the multi-type frequency modulation resources, and the multi-type frequency modulation resources comprise at least one of thermal power, hydroelectric power, wind power, photovoltaic power and energy storage; based on the frequency modulation effect and frequency modulation cost of the multi-type frequency modulation resources, constructing a primary frequency modulation dead zone optimization model of the multi-type frequency modulation resources, the primary frequency modulation dead zone optimization model comprising a primary frequency modulation dead zone optimization objective function and constraint conditions; and performing simulation based on the dead zone combination of the multi-type frequency modulation resources and the primary frequency modulation simulation model to obtain a simulation result, and solving the primary frequency modulation dead zone optimization model based on the simulation result to obtain an optimal primary frequency modulation dead zone of the multi-type frequency modulation resources. According to the invention, overall optimization of the frequency modulation cost and the frequency modulation effect of primary frequency modulation of the regional power system can be realized.

The present invention discloses a method for rapid identification of interphase short circuits based on wavelet packet transform, comprising the following steps: obtaining attribute information of a line fault point; obtaining phase current information at the protection installation locations at both ends of the fault point, and performing phase-mode transformation to obtain mode current information; calculating differential current using the mode current information; decomposing and reconstructing the differential current using db4 wavelet to obtain several high-frequency bands and one low-frequency band; calculating the high-frequency energy proportion of the high-frequency band and the low-frequency energy proportion of the low-frequency band in each data window and drawing an energy proportion curve; and determining the fault type based on the amplitude and duration of the energy proportion. The effects achieved by this solution are: rapid identification after an interphase short circuit fault occurs, unaffected by the system operating mode and power frequency oscillation, and no dead zone within the area, unaffected by the fault location, thereby improving protection reliability.