55 results about "Voltage oscillation" patented technology

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 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.

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 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 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.

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.

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.

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 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.

This invention discloses a control method, device, electronic device, and medium for a multilevel converter, relating to the field of control. In this solution, when the flying capacitor voltage of the multilevel converter is in an uneven voltage state, a set of mutually paired upper arm switch control sequences and a set of lower arm switch control sequences are determined based on the number of switches in the multilevel converter. Corresponding upper arm PWM waves and lower arm PWM waves are generated to control the on / off states of the upper and lower arm switches. Since sequentially sending a pair of mutually paired upper arm PWM waves and a pair of lower arm PWM waves in adjacent cycles can balance the flying capacitor voltage, this solution periodically sends the first upper arm PWM wave, the second upper arm PWM wave, the first lower arm PWM wave, and the second lower arm PWM wave to balance the flying capacitor voltage as much as possible, thereby eliminating the voltage oscillation effect of the multilevel converter when the flying capacitor voltage is uneven.

A method including: charging a capacitor in parallel to the ESD; determining whether an energy storage device (ESD) is in use; monitoring temperature of the ESD, the ESD has a prescribed and operational temperature range; discharging the capacitor through an inductor by temporary actuation of a switch that couples the inductor in parallel to the capacitor, wherein oscillation of current and voltage is provided by a first circuit formed by the capacitor and the inductor, maintaining the ESD temperature within temperature range through oscillation of the ions due to high frequency oscillation of a second circuit formed by the capacitor and the internal inductance of the ESD, repeating the temporary reactuation of the switch while temperature is within the temperature range. Wherein the given temperature range is the prescribed temperature range when the ESD is not being used and is the operational temperature range when the ESD is being used.

The application discloses a control circuit applied to a photovoltaic shutdown device, the photovoltaic shutdown device and a photovoltaic system, and belongs to the photovoltaic technical field.In the control circuit of the embodiment of the application, a switch module is connected with a photovoltaic module.A switch control module is connected with the switch module, and is used for outputting a control voltage according to a comparison result of a first voltage and a second voltage, and controlling the on-off state of the switch module.A hysteresis filtering module is connected between the switch control module and the switch module at one end, and is connected between a first voltage dividing unit and the switch control module at the other end, and is used for staggering the threshold points of the switch module in the on state and the off state when the control voltage is equal to an input voltage.In this way, the switch module is prevented from being repeatedly turned on and turned off due to the influence of voltage oscillation at the on time and the off time, accurate control of the switch module is achieved, the service life of the switch module is prolonged, and the reliability and safety of the photovoltaic system are improved.

The application discloses a soft start circuit for a switching converter, which is used to generate a first reference voltage gradually increasing over time, and an output voltage of the switching converter follows the first reference voltage to work. The soft start circuit comprises a slope voltage generation module, which comprises a current source, a first transistor and a capacitor connected in sequence between a power supply voltage and the ground, a shorting point of a control end and a first end of the first transistor being used to output a slope voltage, and an initial voltage of the slope voltage being greater than 0; and a voltage following module, an input end of which is used to input the slope voltage and generate the first reference voltage by following the slope voltage. The application clamps the initial voltage of the slope voltage by adding a MOS diode, so that the time when the first reference voltage is 0V can be effectively shortened after the chip is powered on, and the problem of output voltage oscillation in the initial stage of the soft start of the switching converter is solved.

The invention relates to a computing power center direct current system virtual modulus impedance control and stability domain evaluation method. The method comprises the following steps: establishing a small signal model of the bipolar VSC, converting the small signal model into a modulus space by combining a modulus conversion matrix, and deducing a transfer function relationship among variables in the modulus space; deriving closed-loop output impedance of the bipolar VSC containing the virtual modulus impedance control parameters based on the transfer function relationship; then, in combination with the modulus conversion matrix, lines and loads outside the output port of the bipolar VSC are mapped to a modulus space, and the relation between the output voltage and the output current of the bipolar VSC is deduced; and finally, based on the closed-loop output impedance and the relationship between the output voltage and the output current, deducing an input-output gain matrix of the power center bipolar direct current system, and identifying the stability domain of the system in combination with a generalized Nyquist criterion. Bus voltage oscillation can be suppressed, and effective evaluation of the system stability domain can be realized.

The utility model relates to the technical field of high-frequency switching power supplies, and mainly provides a magnetic integration device, a low-voltage high-power adjustable power supply and a low-voltage system, the power supply comprises a first transformer and a second transformer, the device comprises a first inductor and a second inductor which are connected with the first transformer, and a third inductor and a fourth inductor which are connected with the second transformer, the first inductor is further connected with the third inductor, and the second inductor is further connected with the fourth inductor. When the voltage of the first transformer / the second transformer abnormally rises, the voltage at the two ends of the first inductor and the voltage at the two ends of the second inductor are limited through the third inductor and the fourth inductor by means of the connection between the first inductor and the third inductor and the connection between the second inductor and the fourth inductor. Voltage at the two ends of the third inductor and the fourth inductor is limited through the first inductor and the second inductor, so that the voltage transformation module outputs a fixed voltage value. Therefore, voltage oscillation at the two ends of the transformer when four independent inductors are adopted can be eliminated by limiting the voltage of the transformer.

The invention relates to a monolithic integrated power device structure capable of improving the anti-interference capability of a grid electrode and a preparation method thereof.The monolithic integrated power device structure comprises a substrate, a power device structure and a filtering structure, the power device structure and the filtering structure are located on the same substrate, monolithic integration of the power device structure and the filtering structure is achieved, and the anti-interference capability of the grid electrode is improved. The structure is simple. The filtering structure is connected with the grid electrode of the power device structure, voltage oscillation signals generated by high-power microwave radiation on the grid electrode can be effectively restrained, the anti-interference capability of the grid electrode is improved, and stable work of the device is guaranteed.

The embodiment of the invention provides an anti-oscillation circuit and an anti-oscillation assembly system for a lithium battery camera. The system comprises a lithium battery; a camera load device; the anti-oscillation circuit is electrically connected with the lithium battery and the camera load device and comprises a first voltage generation part, the first voltage generation part is provided with a first voltage and an enable signal, and the first voltage generation part comprises a first triode and a second triode; in the process that the lithium battery supplies power, after the first voltage is lower than the first voltage threshold value, when the lithium battery is in voltage oscillation, the first triode is kept disconnected, and the second triode is kept connected, so that when the lithium battery is in voltage oscillation, the first triode is disconnected, and the second triode is connected with the second triode. And the lithium battery and the camera load device are kept disconnected, so that the problem of frequent oscillation and restart when the electric equipment works in a low-temperature environment is reduced.

The application discloses a kind of network type wind farm transient voltage control method based on adaptive droop, device and storage medium, relating to wind power generation technical field, the disclosed method includes: when detecting that network type wind turbine generator exists transient voltage, determine the power control instruction to make the node voltage fluctuation of network type wind farm reach minimum value;Power control instruction is output to network type wind turbine;Get the state parameter after network type wind turbine generator responds power control instruction;Determine the deviation between state parameter and state reference value, and adjust the network control parameter of network type wind turbine generator through the network control parameter droop coefficient of network type wind turbine generator and deviation, to make the output voltage of network type wind turbine generator be in preset voltage range and output frequency be in preset frequency range, so that network type wind farm is subjected to transient voltage disturbance period, effectively suppress voltage oscillation and frequency oscillation, improve the stability of network type wind farm.

The application discloses a power coordination recovery control method for inhibiting repeated low voltage ride through of a doubly-fed wind turbine. The application proposes to coordinate the recovery slope of active current and reactive current aiming at the repeated low voltage ride through problem of the doubly-fed wind turbine after fault clearance. Firstly, a phase-locked loop second-order underdamped model is established to estimate the peak time and valley time in the voltage recovery process; then, the current recovery expression is substituted into the grid connection point voltage equation to construct a voltage constraint inequality, so that the peak time does not trigger high voltage ride through and the valley time does not trigger low voltage ride through; finally, the feasible range of the active recovery slope and the reactive recovery slope is determined according to the constraint inequality, the optimal active and reactive current recovery slope is determined by combining the current limiting or recovery time matching constraint, and the current reference instruction is input to the rotor side converter. The application can effectively inhibit voltage oscillation when exiting the low voltage ride through stage and improve the transient stable operation ability of the wind turbine under weak grid conditions.

An electronic circuit, electronic system, and driving method are provided to suppress the generation of control voltage oscillations when a semiconductor switching element is turned on. The electronic circuit of the present invention includes: a semiconductor switching element; and a driving circuit that supplies current to a control terminal of the semiconductor switching element and adjusts the magnitude of the current supplied to the control terminal in accordance with the voltage of the control terminal.

A method for regulating a grid-coupled power converter includes adjusting a control voltage for the power converter in dependence on an output voltage of the power converter. The method provides limiting a voltage deviation between the control voltage and the output voltage. In embodiments, the limitation of a control voltage phasor takes place in amplitude and angle, wherein control ranges for amplitude and / or angle are adjusted depending on the situation. In further embodiments, the limitation takes place in coordinates of coordinate axes that are orthogonal and rectilinear to each other. Further, in a method for regulating a power converter, when determining a control quantity, a potential difference between a reference potential of the output voltage and a reference potential of a bridge voltage of the power converter is considered. Alternatively or additionally, contribution of a voltage oscillation in an intermediate circuit to the bridge voltage is considered.

The invention provides an arc extinguish chamber, and relates to the technical field of electrical equipment. The arc extinguish chamber comprises a plurality of grid sheets which are arranged at intervals. Wherein at least part of the grid sheets comprise first ends and second ends, the first ends are used for facing the contact mechanism, the distance between at least part of structures of the at least two adjacent grid sheets at the first ends is a first distance, the distance between at least part of structures of the at least two adjacent grid sheets at the second ends is a second distance, and the second distance is smaller than the first distance. Therefore, the phenomenon of repeated breakdown or back breakdown of the arc caused by voltage oscillation at the inlet area is avoided, and the arc extinguishing stability and reliability are remarkably improved.

The invention provides a self-adaptive damping control method of a bidirectional direct-current converter under a load throwing working condition, and relates to the field of power electronics, and the method comprises the steps: building a bidirectional direct-current converter system, collecting circuit data for initialization, and setting a starting mode; in the mode, a strategy of combining soft start with PI control is adopted, the duty ratio is calculated through a reference voltage slope and a PI regulator, and a PWM module generates four paths of driving signals to control the on and off of a full-bridge MOS tube; in the control process, analyzing system working conditions according to collected circuit data, and switching to a steady-state mode when a load throwing working condition occurs; in the mode, a composite duty ratio control law is constructed by using an LADRC linear active disturbance rejection control strategy, a complementary PWM signal is generated after amplitude limiting processing, and the system is driven to recover energy. Through mode switching and LADRC linear active disturbance rejection control, voltage oscillation under load throwing disturbance is effectively suppressed, and the dynamic stability and the voltage stabilization precision of the system are improved.

The application relates to the technical field of electric energy conversion control, and discloses a marine cascade architecture voltage balance logic scheduling system, which comprises a cascade power sub-module, a sampling unit and a power balance controller. The power balance controller is integrated with a transient state prediction compensator, which is used for calculating second-order difference parameters of a voltage sampling sequence, identifying a marine load energy pulsation trend and searching for a trigger time advance. The power balance controller is also used for performing phase offset on a voltage balance lag window, adjusting a switch bridge arm driving signal according to the trigger time advance. The application realizes alignment of a scheduling instruction execution time and a marine load pulsation period by guiding dynamic contraction of a lag window width through difference parameters, offsets a sampling circuit group time delay, reduces power device transient state electric field stress, suppresses sub-module voltage oscillation and delays a thermal aging process.

The invention discloses a digital-analog hybrid chip-oriented high-precision separated multi-power rail power supply system, which relates to the technical field of microelectronics, and comprises an enable circuit module for outputting an enable signal; the linear voltage stabilization module is used for outputting stable first direct current voltage; the VCC power supply module is used for outputting VCC voltage; the band-gap reference module is used for outputting reference voltage; the oscillator module is used for outputting periodic alternating signals; the charge pump module is used for outputting stable second direct-current voltage; meanwhile, the VCCGATE signal output module is used for outputting a stable VCCGATE signal; and the VCCx power supply module is used for outputting a plurality of VCCxGATE signals. According to the invention, multi-power rail voltage output is realized through single constant voltage loop control, and the requirements of a digital-to-analog conversion chip for different voltage domains are met.

This invention discloses a converter suitable for a wide range of output voltages and its control method. The converter includes a PWM half-bridge circuit. The control method includes the following steps: adjusting the switching frequency to put the PWM half-bridge circuit into discontinuous mode; when the PWM half-bridge circuit operates in discontinuous mode, the output inductor, the magnetizing inductance of the transformer, and the parasitic capacitance of the PWM half-bridge circuit oscillate; when the midpoint voltage of the primary-side switching bridge arm reaches its valley or peak, the corresponding power switch is triggered to turn on. This invention reduces switching losses by controlling the corresponding power switch in the PWM half-bridge circuit to turn on when the voltage across it oscillates to its valley.

The invention provides a DC converter absorption circuit and an absorption circuit device parameter determination method, and relates to the technical field of electronic power converters, and the DC converter absorption circuit comprises a bridge topology inverter, a transformer and an absorption unit; the transformer comprises a primary winding, and the bridge topology inverter comprises a first output end and a second output end; the first output end is connected with the first end of the primary winding, and the second output end is connected with the second end of the primary winding and used for providing preset waveform voltage for the primary winding; the absorption unit comprises an absorption resistor and an absorption capacitor which are connected in series, the first end of the absorption unit is connected with the first output end and the first end of the primary winding, and the second end of the absorption unit is connected with the second output end and the second end of the primary winding. The problem of voltage oscillation caused by transformer leakage inductance and switching device output capacitance resonance can be effectively suppressed.

A driving method of a multi-color electronic paper device, the driving method comprising: providing a driving waveform, the driving waveform sequentially comprising a large-voltage driving segment, a small-voltage driving segment, a large-voltage oscillation segment, and a red particle optimization segment, the large-voltage driving segment comprising a first voltage level, the small-voltage driving segment comprising a second voltage level and a third voltage level, the large-voltage oscillation segment comprising the first voltage level, the second voltage level, and a fourth voltage level, the red particle optimization segment comprising the second voltage level and the fourth voltage level, the voltage levels in order from large to small being the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level.