181 results about "Voltage oscillation" patented technology

The invention relates to the technical field of information, and discloses a fault current suppression method and system for a direct-current deicing device, fault current data of the direct-current deicing device are analyzed through fast Fourier transform, and direct-current bus voltage drop data are obtained based on an analysis result and are processed through a support vector regression algorithm, so that a fault current suppression result is obtained. Obtaining a voltage stress sudden increase trend and further determining stress distribution data of a switching device in the device; processing the stress distribution data by a Kalman filtering algorithm to obtain a processing result so as to determine a dynamic correction coefficient of a bridge arm switching time sequence, and processing the dynamic correction coefficient and element response delay data of the device by a particle swarm optimization algorithm to generate a bridge arm switching time sequence so as to determine a real-time adjustment parameter influencing the discharge rate of a buffer capacitor in the device; and comparing voltage oscillation characteristics before and after matching to determine an impedance compensation value of a commutation path for execution, thereby realizing effective suppression of current oscillation in the DC deicing device.

The utility model discloses a lightning protection circuit and a power converter, and relates to the technical field of power electronics. According to the lightning protection circuit, for the condition that a capacitor parallel branch in a bus capacitor circuit comprises a first capacitor, a second capacitor and an inductor, and the first capacitor is connected with the inductor in series and then connected with the second capacitor in parallel, a lightning protection device is arranged to be connected with the inductor in parallel; in the lightning stroke process, the voltage at the two ends of the inductor exceeds the action voltage of the lightning protection device, so that the lightning protection device is broken down, and the voltage at the two ends of the inductor is clamped at the voltage drop after the lightning protection device is broken down, so that overlarge voltage cannot be formed on the second capacitor; therefore, the problem of voltage oscillation caused by current backflow at the lightning stroke moment can be weakened, the voltage stress borne by a corresponding power device in a post-stage circuit is reduced, and the corresponding power device is effectively protected.

The invention discloses a power semiconductor device and a manufacturing method thereof. The device comprises a first base region, a second base region, a field stop region, a plasma storage region and a bottom doped region which are sequentially arranged from top to bottom, wherein a top P region and a terminal field limiting ring are arranged in the first base region. Wherein the first base region is used for optimizing the terminal structure; the second base region is used for improving a self-clamping function and adjusting power consumption and static breakdown voltage; the field termination region is used for terminating an electric field and suppressing current and voltage oscillation; the plasma storage area is used for expanding the safe working area and improving the self-clamping function. By optimizing and compromising the structural parameters of each area, the device can achieve the beneficial effects of self-clamping, low loss, wide safe working area and small terminal size.

The invention discloses a multi-agent-based virtual power plant layered voltage coordination control system and method, and relates to the technical field of coordination control, and the method comprises the steps: obtaining the original operation data of a distributed energy unit in a virtual power plant, and constructing a dynamic mapping model representing the relation between node voltage and control input; decomposing the dynamic mapping model into a fast dynamic sub-model and a slow dynamic sub-model; generating a fast loop control law based on the fast dynamic sub-model, and performing residual calculation and online correction on the slow dynamic sub-model according to the fast loop control law; establishing a global optimization objective function according to the corrected slow dynamic sub-model, and solving a reference value of each node through a distributed algorithm; issuing the node reference value to a local inverter, and generating a control input signal in combination with a fast loop control law; according to the method, the problems of voltage oscillation, tracking errors and slow convergence caused by virtual power plant fast and slow control conflicts are solved through fast and slow dynamic layering cooperative control.

The invention relates to the technical field of ship electric energy storage, and discloses a ship distributed electric energy storage and distribution balance control system which comprises a plurality of distributed storage units, a direct current bus, a plurality of power conversion modules and a dynamic balance control module. The dynamic balance control module is used for collecting the voltage deviation value of the direct current bus and the current response rate and the charge state parameter of each storage unit and determining a transient charge deviation compensation value, and the system determines the transient power flux of each node according to the current response rate and the charge state parameter. And dynamic linear calibration of feedback gain is realized based on the charge deviation compensation value so as to adjust the power output flow rate of each storage unit, the charge throughput of the direct current bus is balanced through real-time hedging of the surplus or deficient state of the transient charge of the bus, voltage oscillation during ship propulsion load switching is effectively inhibited, and the reliability of the ship propulsion load switching is improved. And the transient stability of the bus voltage is maintained.

The invention relates to a current source grid driving device, method and equipment of a semiconductor switching device. The device comprises a control module, a current and voltage detection module, a logic judgment module, an auxiliary control module and a current source driving module. The device can accurately detect the turn-on or turn-off state of the semiconductor switching device through the current and voltage detection module. Using a logic determination module to randomly adjust the start and stop time of triggering a turn-on current square wave or turn-off current square wave by an auxiliary control module according to a first reference voltage and a second reference voltage of voltage reference data and to adjust the output of the auxiliary control module according to a third reference voltage and a fourth reference voltage of the voltage reference data The current amplitude in the turn-on current square wave or the turn-off current square wave is calculated according to the current amplitude of the turn-on current square wave or the turn-off current square wave, so that the control current output by the current source driving module has a very high control freedom degree, and the switching loss of the semiconductor switching device can be reduced as much as possible while current and voltage oscillation in the semiconductor switching device can be easily suppressed.

The invention discloses a control method and equipment for a full-control device clamping circuit, and relates to the technical field of full-control device clamping circuits, and the method comprises the steps: determining a product of a reflection voltage oscillation period and a time coefficient, and enabling the product to be a reference time interval of a corresponding bridge arm; in a same-bridge-arm inner and outer tube double-turn-on scene or a same-bridge-arm inner and outer tube double-turn-off scene, acquiring an instantaneous current of a current bridge arm; determining an actual time interval according to the reference time interval and the time interval adjustment amount; and controlling the current bridge arm based on the actual time interval. The current bridge arm is controlled by determining the actual time interval through real-time adjustment, overvoltage of a full-control device is prevented, the reflection voltage of the load end is reduced, and insulation of the load and the electric wire is protected.

The invention provides a permanent magnet direct drive fan bus voltage oscillation suppression method after power grid fault recovery, and belongs to the technical field of permanent magnet direct drive fans. The technical problem of DC bus voltage oscillation after symmetric fault recovery is solved. According to the technical scheme, the method comprises the following steps that S1, the power difference value P between a computer side and a network side during a fault period and the maximum unbalanced power Pmax absorbed by the rotational inertia of a fan rotor are included, if P is smaller than or equal to Pmax, the step S2 is executed, and if P is larger than Pmax, the step S3 is executed; s2, controlling a direct-current bus voltage outer ring by a grid-side converter, and turning to S5; s3, a DC bus voltage outer ring is controlled by a fuzzy PI adaptive controller; and S4, carrying out fuzzy processing. According to the invention, adaptive adjustment of DC bus voltage outer loop PI parameters is realized, the dynamic response capability is enhanced, voltage oscillation is effectively suppressed, and the stability is improved.

The invention provides a micro-grid controller and method for multi-electric-vehicle electric power spring access, the controller and method can be used for hierarchical cooperative control of an alternating-current micro-grid, and an upper-layer controller realizes power cooperative distribution among multi-electric-power-spring electric vehicles through a consistency algorithm based on a directed graph and a droop control strategy. The lower-layer controller adopts model-free adaptive constraint control with anti-saturation compensation to realize accurate voltage tracking, and voltage oscillation caused by inverter saturation can be effectively suppressed through a relative output observer based on a pseudo-partial derivative and a compensation mechanism based on input constraint, so that the electric energy quality of the micro-grid is improved, and the power consumption of the micro-grid is reduced. According to the invention, when the multi-power-spring electric vehicle is connected to the AC micro-grid, the rapid stabilization of the bus voltage and the significant reduction of the harmonic content can be realized under the conditions of grid voltage fluctuation and load abrupt change.

The invention relates to the technical field of systems for adjusting electrical variables, and discloses an automatic adjusting system for voltage fluctuation in an electroplating process, and the system comprises a feature extraction module which is used for obtaining an original sampling signal of voltage transient change of a controlled load end and extracting voltage differential information; the logic damping operation module is used for generating a logic compensation instruction according to the voltage differential information and a preset logic damping operator; and the pulse width modulation instruction reconstruction module is used for reconstructing a carrier phase and a placeholder edge time sequence according to the logic compensation instruction to correct the duty ratio. Virtual damping vectors with opposite polarities are implanted into a digital control loop, so that the output voltage generates a damping response which is subjected to exponential attenuation along with time to suppress transient voltage oscillation; according to the method, high-frequency ringing signals caused by coupling of parasitic parameters of the power transmission line and equivalent impedance of the controlled load are eliminated, and the voltage stability of the controlled load group during frequent switching of multiple task positions is guaranteed.

A resonant circuit for an aerosol generating system includes an inductive element for inductively heating a susceptor arrangement to heat an aerosol generating material to thereby generate an aerosol. The circuit also includes a switching arrangement that, in use, alternates between a first state and a second state to enable a varying current to be generated from a DC voltage supply and flow through the inductive element to cause inductive heating of the susceptor arrangement. The switching arrangement is configured to alternate between the first state and the second state in response to voltage oscillations within the resonant circuit which operate at a resonant frequency of the resonant circuit, whereby the varying current is maintained at the resonant frequency of the resonant circuit.

The invention discloses a VSC-HVDC grid-connected stability improvement method and system under a weak power grid based on SVG impedance remodeling, and the method can adjust the actual reference value of the dq-axis current of a current control inner ring through introducing a damping factor on the premise of not adding an oscillation detection module and a sensor, equivalently changes the output impedance of a static var generator, and improves the stability of the VSC-HVDC grid-connected stability. And therefore, the SVG low-frequency-band negative damping characteristic can be improved, and the grid-connected system damping can be According to the method, the grid-connected point voltage oscillation when the VSC-HVDC grid-connected system containing the SVG interacts with a weak power grid can be effectively suppressed, the stability of the grid-connected system is enhanced, and the stability margin of the system is improved.

The invention belongs to the technical field of converter stability analysis and control, and discloses a new energy converter low-pass control dominated voltage oscillation parameter feasible region construction method, system and equipment and a medium, so as to solve the problem that accurate description of a system stability boundary is difficult to realize in the prior art. The method comprises the following steps: establishing a converter grid-connected system model considering low-voltage ride-through control, and generating a data set comprising a multi-parameter combination and a corresponding repeated low-voltage ride-through state tag based on the model; taking the data set as training data, and training the repeated low-crossing risk discrimination model by adopting a fast kernel learning algorithm to obtain a trained model; and inputting converter grid-connected system parameters needing to be analyzed into the trained model for classification prediction, and drawing a parameter region without repeated low-voltage crossing based on a result to obtain a multi-parameter feasible region schematic diagram. According to the method, the technical blank of carrying out accurate quantification and visualization on the repeated low-penetration stable boundary in a complex parameter scene is filled.

The present invention relates to the field of voltage control technology, and specifically to a wind power cluster multi-station reactive voltage collaborative control device and method, the device comprising: an AVC master station, responsible for the overall voltage optimization control of the system; an AVC cooperative control substation, located between the AVC master station and the AVC substation, receiving the voltage control instructions sent by the AVC master station, converting the voltage control instructions into reactive instructions, and sending them to each AVC substation for execution; the AVC substation, receiving the reactive instructions sent by the AVC cooperative control substation, controlling the reactive sources in their respective areas, and performing closed-loop control of the voltage target value; a parameter control system, which uses two sets of control parameters to respectively apply the control requirements of the same application scenario and switch the control parameters. Through the present invention, the problems of voltage oscillation and control difficulty caused by the large discreteness of the response time in the prior art are effectively solved, the response speed of the system and the stability of voltage control are improved, and it is adapted to different wind farm layouts and control requirements.

The invention relates to the technical field of power distribution network intelligent regulation and control, and discloses a stock area charging load dynamic matching and balancing method, device and medium, and the method comprises the steps: dividing a stock area into a plurality of local control sub-areas according to topological information, constructing a low-delay communication link according to communication delay parameters, calculating the average communication delay, and calculating the average communication delay; carrying out delay compensation on the voltage sampling sequence and the charging load power sequence to obtain a voltage trend quantity and a load power trend quantity, carrying out dynamic matching adjustment on the local control subarea to obtain a voltage trend quantity mean value and power distribution data, and carrying out global asynchronous coordination control on the local control subarea to obtain power distribution data; and performing oscillation detection and damping control on the updated voltage, and adjusting distribution according to the control voltage and the load power to generate a global dynamic balance state. Under the condition that communication delay and node coordination are inconsistent, secondary voltage oscillation is reduced, the frequency of voltage fluctuation and power reverse impact is reduced, and the dynamic stability is improved.

Embodiments of the application disclose a direct-drive wind turbine low-voltage ride-through control method and related equipment. The method comprises: generating a ride-through high-level signal to activate a low-voltage ride-through mode when a low-voltage ride-through trigger module detects that a current voltage value of a target power grid where a target direct-drive wind turbine is located is lower than a preset reference value; calculating a voltage drop depth according to the current voltage value and the preset reference value; a low-voltage period reactive power control module of a grid-side control system controls the target direct-drive wind turbine to output reactive power to the target power grid to support the power grid according to the voltage drop depth; and an active power control module of a machine-side control system controls output power of the target direct-drive wind turbine according to the voltage drop depth. The direct-drive wind turbine low-voltage ride-through control method overcomes the direct-current voltage overvoltage oscillation defect of the prior art and limits the machine-side electromagnetic power during the wind turbine low-voltage ride-through period from the source.

The present invention relates to a grid-connected control method for an active damping LCL inverter based on capacitor current negative feedback, which includes a voltage outer loop plus a capacitor current inner loop control, and in the process of switching between grid connection and off-grid connection, switching into grid voltage full feedforward control of the grid-connected inverter to offset grid voltage disturbances. The capacitor current feedback active damping method has lower additional losses and output current total harmonic distortion in the inverter output power. In actual power grids, in addition to the power frequency fundamental component, the grid voltage also contains a large number of low-order harmonics. The grid voltage harmonics also cause the grid-connected current to generate harmonics. The influence of the grid voltage on the grid-connected current can be suppressed by proportional feedforward, first differential feedforward, and second differential of the grid voltage. In order to reduce the distortion of the filter capacitor voltage during the switching between grid connection and off-grid connection, the grid current reference can be linearly reduced to zero within the time required by the specification to cope with the adverse situation of the inverter switching from grid-connected full load to independent no-load. The above method has a very obvious effect in suppressing load voltage oscillation.

The invention discloses a fuel cell response test method, which is characterized by comprising the following steps of: carrying out rapid variable load test: simulating 0-100% rated power step change, and recording voltage oscillation, local hot spots and water logging phenomena; a start-stop cycle test: high-frequency on-off of hydrogen / air supply is carried out, and the oxidation-reduction attenuation characteristic of the catalyst is evaluated; and transient disturbance test: superposing current fluctuation of random frequency, and analyzing the dynamic evolution rule of the pile impedance spectrum. The invention has the following advantages: 1, a gas supply rapid following mode is provided; 2, a high-precision dew point controllable technology is provided; and 3, a high-precision simulation actual road condition load mode is provided.

The utility model relates to the technical field of electronic equipment power supply, in particular to an electronic equipment power supply circuit based on a USB (Universal Serial Bus) interface, which comprises a power supply connecting end, a reference power supply connecting end, a voltage comparator, a reference voltage generator, a trigger, a power switch and a voltage output end, wherein the power supply connecting end is respectively connected with the voltage comparator, the reference voltage generator and the power supply switch; the voltage comparator is connected with the trigger through the first switch, the trigger is connected with the power switch through the second switch and the third switch in sequence, and the power switch is further connected with the voltage output end. The reference power supply connecting end is arranged on a line between the voltage comparator and the reference voltage generator, and the reference power supply connecting end is further connected with the first switch, the trigger and the second switch. Through the logic control of the voltage comparator and the trigger, the circuit is ensured to stably supply power to equipment in a proper current mode, and the adverse effect caused by the oscillation of the input voltage is avoided.

The invention discloses a direct-current converter for oscillation suppression and surplus power absorption and a control method thereof, and relates to the technical field of direct-current power transmission and distribution, a function module unit is formed through the parallel design of an oscillation suppression subunit and a power absorption subunit, and then a function module is formed through cascading the function module unit. And the function module and the starting module are connected in series to form the direct-current converter for oscillation suppression and surplus power absorption. By adopting the embodiment of the invention, accurate suppression of direct current voltage oscillation and efficient absorption of surplus power can be integrated, and safe, stable and reliable operation of a direct current power transmission and distribution system is ensured while hardware cost and space occupation are reduced.

An oscillator comprises a reference current generating circuit, a voltage modulator circuit and an oscillating circuit. The reference current generating circuit is used for generating a reference current. The voltage modulator circuit is configured to receive a feedback voltage and perform a voltage modulation operation according to a first reference voltage and the feedback voltage to generate a modulated voltage. The oscillation circuit is coupled to the reference current generating circuit and the voltage modulator circuit and is used for generating an oscillation signal with an oscillation frequency according to the reference current and the modulated voltage.

A mixed-signal integrated circuit (IC), including: a voltage booster that includes one or more charge pump devices configured to receive an input voltage, an oscillator signal, and a control signal, wherein the one or more charge pump devices comprise a network of capacitors switchable to provide a charged pumped in response to the control signal, and wherein the one or more charge pump devices, using the pumped, generate a boosted voltage based on the input voltage and at least a portion of an amplitude of the oscillator signal, a voltage regulator coupled to the one or more charge pump devices and configured to receive the boosted voltage and generate a regulated boosted voltage based on the boosted voltage, and a control and monitoring engine configured to provide the control signal based on, at least in part, the input voltage, the oscillator signal, and the regulated boosted voltage.

The application discloses a voltage-controlled oscillator and electronic equipment, the voltage-controlled oscillator comprises a sampling module, a voltage lifting module and an oscillator module; the sampling module is connected with the voltage lifting module, and the voltage lifting module is connected with the oscillator module; wherein the sampling module is used for inputting a clock signal and maintaining a voltage unchanged during a low voltage period of the clock signal; the voltage lifting module is used for lifting an input voltage signal; the oscillator module comprises a frequency control unit and an inverter chain; the frequency control unit is used for controlling an oscillation frequency and performing a one-phase transformation on a signal; the inverter chain is used for performing a signal delay and inversion; and the inverter chain comprises a plurality of inverter devices connected in sequence. The voltage-controlled oscillator does not need to use a power supply voltage as a control voltage, the oscillation amplitude is more stable, and sampling application can be conveniently and efficiently realized. The application can be widely applied in the technical field of electronic equipment.

Embodiments of the present application provide a power grid control method and device, electronic equipment, storage medium and program product. It relates to the technical field of new smart grid control. The method comprises: acquiring a first voltage and a first current of a first power grid, the control system of the first power grid comprising a plurality of voltage control devices; determining a first parameter of the first power grid based on the first voltage and the first current, the first parameter being used to indicate the strength of the first power grid; adjusting a second parameter of the plurality of voltage control devices based on the first parameter, the second parameter being used to indicate the suppression capability of voltage disturbance and the attenuation capability of voltage oscillation of the first power grid, the first parameter being negatively correlated with the second parameter; and controlling the first voltage based on the adjusted plurality of voltage control devices. The stability of the power grid system in a weak power grid can be improved.

To suppress oscillation of the output voltage of a DC / DC converter during a discharge process performed by the DC / DC converter.SOLUTION: An electric motor vehicle comprises: an inverter which drives a motor; a power storage device connected with a first power line with the inverter; a relay provided in the first power line; a capacitor connected on the inverter side of the relay of the first power line; a DC / DC converter which steps down voltage on the inverter side of the relay of the first power line to be supplied to a second power line; and a control device which turns the relay off to execute discharge processing by the DC / DC converter when discharge of the capacitor is requested. The control device controls the DC / DC converter so that the output current of the DC / DC converter is restricted to a value not exceeding the upper limit in the discharge processing.SELECTED DRAWING: Figure 2

The invention relates to the technical field of power distribution area voltage regulation and control, in particular to a power distribution area voltage treatment method in an uninterruptible power supply scene. According to the method, disturbance intensity is obtained according to a prediction residual error of voltage data at each time point and is used for representing load unpredictability of a current power distribution area working condition; a voltage offset risk indicator is further obtained based on the distribution of the voltage in the dead zone range. The adjustment cost of the two modes is determined based on the disturbance intensity and the voltage deviation risk index, the adjustment cost of the OLTC is further adjusted based on the working condition change rate, and then an effective adjustment mode instruction is selected. According to the method, dynamic and optimal distribution of functions of the voltage regulating equipment is realized, voltage oscillation possibly caused by equipment action conflicts originally is converted into a stable and ordered control right handover process, voltage treatment is completed on the premise that secondary disturbance is not introduced, and the voltage regulation efficiency is improved. And the core requirements of the uninterrupted power supply scene on the continuity and the stability of the power supply process are directly met.

The utility model relates to a kind of igniters, comprising: the connector for taking electricity from USB device, with the connector voltage-boosting oscillation circuit, with the output end of the voltage-boosting oscillation circuit is connected for producing electric arc electrode;Wherein, the voltage-boosting oscillation circuit includes high-frequency transformer, MOS switch and PWM controller;The high-frequency transformer includes primary winding and secondary winding, the primary winding is powered by the connector;The MOS switch is connected with the primary winding in series;The PWM controller is by control the MOS switch to make the circuit of the primary winding controlled opening and closing, and make the secondary winding produce high-voltage oscillation current.The igniter of the utility model uses electric arc to ignite, warm up fast, safer to use.

To provide a voltage supply circuit that can reduce the ripple in the output voltage of a charge pump circuit by suppressing the effect of changes in the power supply voltage on the voltage supplied to the charge pump circuit. [Solution] The voltage supply circuit according to the embodiment includes: a first LDO amplifier circuit that receives a power supply voltage from a power source and outputs a first control voltage from a first output unit according to a preset reference voltage; a second LDO amplifier circuit that receives a power supply voltage from a power source and outputs a second control voltage from a second output unit according to a reference voltage; an oscillation circuit; a first charge pump circuit that outputs a first output voltage generated from the first control voltage to a first output terminal; a second charge pump circuit that outputs a second output voltage generated from the second control voltage to a second output terminal; and a control circuit that controls the operation of the first LDO amplifier circuit and the second LDO amplifier circuit.

The invention relates to the technical field of semiconductors and power converters, and particularly discloses a multifunctional analysis system for electrical characteristics of a gallium nitride switching device, which is characterized in that a GUI interface implementation module comprises a double-pulse test circuit diagram displayed in a main interface, a software function selection button and a software closing button; the double-pulse test circuit diagram shows a test circuit schematic diagram of the gallium nitride switching device, the software function selection button is used for selecting different prediction analysis functions, and the software closing button is used for closing the system; and the Simulink model implementation module constructs a double-pulse test simulation circuit based on a Simscape model converted by using a Spice model, calculates simulation data, operates simulation and outputs the simulation data. According to the method, the voltage oscillation waveform and the crosstalk waveform of the gallium nitride switching device can be accurately predicted, a user can select device manufacturers and models and set parameters of a circuit used for simulation, and the voltage oscillation and crosstalk conditions of the gallium nitride switching device can be visually observed.

The utility model discloses a protection starting locking closing circuit for a power supply system, and relates to the field of power supply systems, and the protection starting locking closing circuit comprises an air switch, a first change-over switch, a second change-over switch, a high-voltage switch cabinet protection device, a circuit breaker, an intermediate relay, a closing coil, an opening coil, and a first connection pressing plate. A first terminal and a third terminal of the air switch are connected with the bus; a second terminal of the air switch is respectively connected with a first terminal of the high-voltage switch cabinet protection device, a first terminal of the first change-over switch, a third terminal of the first change-over switch and one end of a normally open contact of the intermediate relay; a fifth terminal of the high-voltage switch cabinet protection device is connected with one end of a first normally-closed contact of the circuit breaker; a fourth terminal of the air switch is respectively connected with the other end of the second normally closed contact of the intermediate relay, the other end of the opening coil and the other end of the coil of the intermediate relay; the whole circuit breaker is connected with a power supply system. According to the invention, voltage oscillation and impact on a power supply system are avoided.