930 results about "Dropout voltage" patented technology

The invention provides an elevator energy-saving device which is connected to an elevator frequency converter bus in parallel and comprises a battery pack, a BMS battery management system, a power control system, a DC-DC direct-current power source and a PLC, the DC-DC direct-current power source is connected with the BMS battery management system and connected to the elevator frequency converter bus in parallel, and the power control system is connected with the PLC. The PLC is connected with the DC-DC direct-current power supply, and the DC-DC direct-current power supply transforms the voltage accessed from the battery pack to the second preset voltage under the action of the PLC, so that the voltage of the high-voltage end is controlled to be the second preset voltage; under the action of the high-low voltage difference, when the elevator generates power, the voltage on the elevator frequency converter bus does not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device. The invention has the characteristics of energy conservation, high efficiency, reduced operation cost, stable operation, reduced power grid pressure and prolonged service life of equipment.

The invention relates to the technical field of electronic circuit detection, in particular to a detection method for checking abnormal work of a lamp, which comprises the following steps: acquiring the consistency of a lighting state and voltage, extracting abnormal response, checking power supply connection and checking non-response, monitoring and controlling the relationship between output and current action starting, and analyzing response continuity. And detecting branch voltage difference change and direction, monitoring voltage jump and current response starting point performance, extracting response data, and obtaining a classification result. According to the invention, through cooperative detection of voltage and current response behaviors, in combination with path voltage difference direction change and time sequence characteristics, a load abnormal response section is identified step by step, the abnormal state identification capability is enhanced, an action time sequence cross validation mode is adopted to replace a traditional static judgment process, misjudgment interference is reduced, and manual intervention requirements are reduced; therefore, the detection process is more continuous, the related operation is universal, the method can be suitable for various lamp structures, the troubleshooting precision is improved, and the execution cost is controlled at the same time.

The invention, which relates to the technical field of energy storage and discharge, provides an energy storage and discharge system comprising a power supply input interface, a slow power-on unit, a slow power-on control unit, an energy storage unit, a start-stop control unit, a sampling unit, a detection unit, a main loop switch unit and an output interface. The power supply input interface is connected with the input end of the main loop switch unit and the input end of the slow power-on unit, the output end of the slow power-on unit is connected with the first port of the slow power-on control unit, and the output end of the main loop switch unit and the second port of the slow power-on control unit are connected with the port of the energy storage unit. The sampling unit is connected with the input end of the detection unit, and the output end of the detection unit is connected with the control end of the main loop switch unit. According to the invention, the problem of'maloperation 'protection of the power supply due to increase of the switching voltage difference in the process of switching the main loop can be avoided, and the reliability of the energy storage discharge system is improved.

The invention discloses a fault detection method, device and system and a storage medium. The fault detection method comprises the steps of obtaining at least two voltage sampling values; wherein the at least two voltage sampling values are obtained by at least two analog front-end modules in the battery monitoring unit through respective target sampling channels to perform voltage acquisition on the same analog battery cell; determining a voltage difference absolute value between every two voltage sampling values in the at least two voltage sampling values; and when the partial pressure difference absolute value in the at least two obtained pressure difference absolute values is greater than a preset threshold value, determining an abnormal target voltage sampling value according to the partial pressure difference absolute value, and determining that the target sampling channel of the corresponding target analog front-end module has an equalization fault according to the target voltage sampling value. Therefore, the accuracy of equalization fault identification can be improved, and the safety of the battery is further improved.

The invention discloses an optimization control method and system for an ultra-large fan intelligent speed regulator, and relates to the technical field of fan intelligent control, and the method comprises the steps: obtaining the current operation environment parameters of a fan, including but not limited to a wind speed signal, a motor input current, a voltage, a power factor, a rotating speed, an environment temperature and atmospheric pressure; monitoring whether the wind speed fluctuation amplitude exceeds a set threshold or not in a continuous sampling period; judging whether the current system enters a critical hysteresis zone state or not, wherein the critical hysteresis zone state is a working condition when the wind speed data of the sensor does not have stability and fan output has current fluctuation abnormity and a differential pressure rapid change trend; when the system enters a critical hysteresis zone state, the collected wind speed signal is paused as a speed regulation basis, an air volume estimation model based on current, voltage, rotating speed, temperature, humidity and air pressure is constructed, and equivalent air volume is output as a pseudo feedback signal; the problem that the fan speed regulation accuracy and the system stability are reduced in the plateau low-pressure environment is solved.

The invention discloses a detection method, a control device, a distribution box and a storage medium. The detection method is used for the distribution box. The detection method comprises the following steps: acquiring a real-time input alternating-current voltage and a zero-point alternating-current phase of the distribution box in a mains supply period; acquiring an analog input AC voltage of the distribution box in the commercial power period according to the zero AC phase; determining that the real-time input AC voltage is normal under the condition that the AC voltage difference between the analog input AC voltage and the real-time input AC voltage is smaller than or equal to a preset threshold value; and when the AC voltage difference between the analog input AC voltage and the real-time input AC voltage is greater than a preset threshold, determining that the real-time input AC voltage is abnormal. Whether the real-time input alternating voltage of the distribution box is normal or not is determined by detecting the alternating voltage difference between the real-time input alternating voltage and the analog input alternating voltage in a mains supply period, interference of an X capacitor arranged between a zero line and a live line can be reduced, and therefore the switching speed is increased to a certain degree.

A power supply having ORing MOSFETs mounts a voltage regulating unit between a main power module and an auxiliary power module of a secondary side of the power supply. The voltage regulating unit regulates a control voltage received by a driving unit, such that a voltage difference between a gate voltage and a source voltage of one of the ORing MOSFETs can be less than a rated voltage threshold for avoiding damaging the one ORing MOSFET.

The utility model provides a device for stably recycling pressure energy and cold energy of natural gas. An inlet of the device is connected with upstream pipeline conveying natural gas, the device comprises a differential pressure generator set, a heat exchange unit and an expansion machine bypass pressure stabilizing unit, the differential pressure generator set and the heat exchange unit are connected in series and then connected with the expansion machine bypass pressure stabilizing unit in parallel, and the differential pressure generator set and the expansion machine bypass pressure stabilizing unit are connected into downstream natural gas using equipment after being gathered. The expansion machine bypass voltage stabilization unit comprises a first voltage stabilization and regulation unit, a second voltage stabilization and regulation unit and a third voltage stabilization and regulation unit, and the first voltage stabilization and regulation unit, the second voltage stabilization and regulation unit and the third voltage stabilization and regulation unit are connected in parallel. On the premise of ensuring normal and stable gas utilization of downstream gas utilization equipment, the device is comprehensively applied by combining an ingenious combination mode with an advanced control method, and abundant energy of natural gas can be fully recycled. And the working requirements of upstream incoming gas under the harsh working conditions of large flow and large pressure difference fluctuation change can be met.

The present invention provides a channel current calibration circuit for an LED driver chip and an LED driver chip, comprising: a calibration voltage generation module and multiple channel calibration selection modules. The calibration voltage generation module is configured to receive a first reference voltage generated by a reference voltage generation module and adjust the first reference voltage according to a preset voltage difference to obtain multiple calibration voltages, wherein the voltage difference between adjacent calibration voltages is the preset voltage difference. The channel calibration selection module is configured to receive the multiple calibration voltages and select a target calibration voltage from the multiple calibration voltages according to a first control signal from a digital controller, thereby calibrating the output current of the channel current generation module to a desired current value using the target calibration voltage. After the calibration voltage generation module adjusts the reference voltage to multiple calibration voltages, each channel calibration selection module selects the corresponding target calibration voltage to adjust the output current of the corresponding channel current generation module to the desired value.

The invention provides a current monitoring circuit, a chip and electronic equipment, and relates to the technical field of electronic circuits, and the circuit comprises a sampling circuit, an operational amplifier circuit and a signal processing circuit; the sampling circuit is connected with a sampling resistor of a monitoring target and outputs sampling voltage to the operational amplifier circuit; the operational amplification circuit outputs the sampling voltage difference after operational amplification to the signal processing circuit; the signal processing circuit comprises a multi-gear voltage generation module and a comparator, and the output end of the multi-gear voltage generation module is connected with the positive input end of the comparator so as to output target reference voltage to the comparator; the output end of the operational amplifier is connected with the negative input end of the comparator, the comparator outputs a feedback signal according to the target reference voltage and the sampling voltage difference, and the feedback signal is used for controlling the working state of a connecting chip; the multi-gear voltage generation module is used for generating reference voltages corresponding to different target currents. The method can adapt to multiple scenes with different current requirements.

Provided are a detection method, a control device, a power distribution box, and a storage medium. The detection method applied in a power distribution box includes: obtaining a real-time input alternating-current voltage and a zero-point alternating-current phase of the power distribution box within a utility power cycle; obtaining a simulated input alternating-current voltage of the power distribution box within the utility power cycle based on the zero-point alternating-current phase; determining that the real-time input alternating-current voltage is normal in response to an alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being smaller than or equal to a predetermined threshold, or determining that the real-time input alternating-current voltage is abnormal in response to the alternating-current voltage difference between the simulated input alternating-current voltage and the real-time input alternating-current voltage being greater than the predetermined threshold.

The invention discloses a three-level flexible excitation dynamic regulation and control method and system for a large-scale hydroelectric generating set, and relates to the technical field of flexible excitation control of the large-scale hydroelectric generating set, and the method comprises the steps: setting a DC bus voltage, and initializing a mapping relation between a capacitor voltage and an excitation output level; collecting operation parameters of a machine end, constructing a disturbance identification model and outputting a disturbance level; the excitation voltage output gear is set according to the disturbance level, the capacitor voltage difference is controlled, and dynamic voltage sharing is achieved by modulating the midpoint duty ratio. According to the method, through setting a bus target voltage and constructing excitation voltage output mapping, in combination with a disturbance level identification mechanism and a dynamic voltage-sharing strategy, closed-loop linkage of disturbance perception-voltage regulation-voltage difference control is realized. According to the method, the identification precision of the system on light disturbance and strong disturbance is effectively improved, the voltage stability and capacitance symmetry of the excitation system are enhanced, the overshoot risk is reduced, and the control robustness and safety of the system under extreme working conditions are improved.

The invention relates to the technical field of power electronic control, and provides a soft start control method for a three-phase PFC (Power Factor Correction), a PFC controller and a power supply system.The soft start control method comprises the steps that when a PFC start instruction is received, an initial target voltage value is set as an actual value of current bus voltage; maintaining the initial target voltage value for a first preset duration; after the initial stable state, sampling in real time to obtain the actual value of the current bus voltage, and calculating the absolute value of the voltage difference between the actual value of the current bus voltage and the current target voltage value; judging whether the absolute value of the voltage difference is smaller than or equal to a preset trigger threshold value; if yes, adding a preset voltage step value to the current target voltage value; if not, keeping the current target voltage value unchanged; and recursive control of the current bus voltage is executed circularly until the updated current target voltage value reaches the final target voltage value. According to the mode, the starting rapidity and the stability of the boosting process are balanced.

The invention discloses a low dropout linear regulator with a wide dropout range, which is characterized in that an error amplifier is supplied with power by output voltage of the low dropout linear regulator, and a common-gate buffer is supplied with power by input voltage of the low dropout linear regulator, so that a direct interference path of the input voltage to the output only exists in a common-gate buffer stage and an output stage; and the power supply rejection ratio is improved. The common-gate buffer solves the problem of margin loss caused by a traditional source follower circuit, a positive feedback loop arranged in the common-gate buffer is used for improving the slew rate of a driving signal VPGATE and providing a certain gain, and therefore the problem of margin under low dropout is solved, and the reliability of the driving circuit is improved. And the compensation circuit can adjust the compensation amount of the low-dropout linear regulator when the input voltage is higher than a preset threshold value, so that the stability of the low-dropout linear regulator under different working conditions is improved.

The invention belongs to the field of power electronic converter control and design, and discloses a carrier modulation method and system for achieving accurate control over the neutral-point potential of a three-level inverter. The neutral-point voltage is kept in a relatively balanced state by detecting and correcting the voltage difference of an upper capacitor and a lower capacitor on the direct current side in time; and the distortion of the output voltage at the alternating current side caused by large fluctuation of the neutral-point potential is reduced or avoided. A midpoint potential correction link is introduced while the advantages of a conventional SVM or carrier modulation are not damaged; and when the neutral-point potential deviates, the zero-sequence voltage is automatically injected or a proper switching vector sequence is selected to compensate, suppress harmonic waves and reduce the distortion degree, so that the waveform quality of the output voltage is improved.

The invention provides a comprehensive evaluation method for the operation effect of a power grid side energy storage power station, and relates to the technical field of energy storage power station evaluation.The comprehensive evaluation method comprises the steps that a historical evaluation data set is obtained, discrete processing is conducted on the evaluation data set, then the time length t is selected as the evaluation time length, and the normal distribution of voltage in the power grid side evaluation time length is calculated; obtaining an adjusted voltage difference curve according to the voltage of the power grid side and the point voltage of the user side, calculating the adjustment coefficient of the energy storage power station, calculating the daily average loss and the economic coefficient by calculating the theoretical electricity price and the actual electricity price of the energy storage power station according to the historical maintenance cost, carrying out regional division on each energy storage power station, and clustering the regions through a clustering method. And calculating a coordination coefficient of the energy storage power station according to a clustering result, dynamically adjusting the weights of the adjustment coefficient and the coordination coefficient through a weighted adaptive algorithm, and calculating a comprehensive evaluation index according to the adjusted weights.

The invention relates to the technical field of electric power acquisition terminal bus M-Bus communication, and discloses a host transmitting and receiving circuit and a communication system.The host transmitting and receiving circuit comprises a transmitting circuit, a transmitting gating circuit, a receiving circuit and an overvoltage detection circuit, when the transmitting circuit receives an output signal of a host, the output voltage level is switched, and when the receiving circuit receives the output signal of the host, the output voltage level is switched; after voltage stabilization processing is carried out on the power supply voltage, a stable voltage signal is output; the sending gating circuit is used for switching the switch state based on the enable signal, so that the corresponding output end outputs a voltage signal; the receiving circuit is used for limiting the voltage difference between the buses when the current of the buses is increased, processing a current signal and then outputting a first level signal to the host; and the overvoltage detection circuit outputs a second level signal when determining that the detection voltage signal is greater than a voltage threshold, so that the host stops outputting and sending the gating circuit. The stability of the output voltage of the transmitting circuit can be ensured, the number of slave machines on the bus is increased, and the reliability of the transmitting and receiving circuit is improved.

According to the current-limiting circuit and the linear voltage regulator for achieving constant power control, after the current of a power tube Ppower tube of a mirror image LDO circuit of a detection tube is compared with a set current-limiting threshold, an output signal pulls up the grid electrode of the Ppower tube to reduce output current, so that output current-limiting control is achieved, and when Vin rises, the output current-limiting control is achieved through the channel length modulation effect of the detection tube and the power tube. And the rated current limiting value is reduced, so that constant power control is realized when the input and output voltage difference of the LDO circuit is increased. Meanwhile, in order to avoid the influence of different Vout on the current limiting value, a Vout clamping circuit is adopted, the drain electrode potential of the Ppower and the drain electrode potential of the detection tube are approximately the same, and the current limiting difference caused by the change of the Vout is avoided. According to the circuit, current limiting and channel length effect differences are combined, as Vin rises, the current rising proportion of the detection tube is larger than that of the power tube, current limiting protection is started in advance, the output current is reduced, the constant power effect is achieved, power rising of the power tube along with Vin rising is avoided, and risks caused by heating when the power is large are reduced.

The embodiment of the utility model discloses a circulating water variable-flow energy-saving system based on resistance coefficient optimization. The circulating water variable-flow energy-saving system comprises a variable-flow energy-saving control system, cold and heat source equipment, end equipment, a bypass regulating valve, a circulating water pump, a frequency converter connected with the circulating water pump, a differential pressure sensor, a flow meter, a water supply temperature sensor and a return water temperature sensor. The embodiment provided by the utility model has the beneficial effects that the resistance coefficient and the pressure difference set value are dynamically adjusted according to the flow and the temperature difference change in the operation process, the pressure difference of the system is optimized in real time, the supply and demand consistency of the operation of the system is ensured, and the energy consumption is reduced; the circulating water flow is controlled through variable flow regulation, the reaction is sensitive, and the adverse effect of hysteresis of conventional temperature difference regulation is eliminated; and the comfort of the user and the energy-saving performance of the system are both considered.

The invention discloses a detection control method for a brush motor, a controller, a system and electrical equipment, relates to the technical field of motors, and can improve the detection accuracy of the working state of the motor under the condition of not influencing the cost. The detection control method for the brush motor comprises the steps that sampling current is obtained, the sampling current is obtained according to the voltage difference between the two ends of a sampling resistor, and the sampling resistor is arranged in a drive circuit of the brush motor; performing ripple algorithm processing on the sampling current to obtain the ripple amplitude of the working current corresponding to the brush motor; and detecting the working state of the brush motor according to the ripple amplitude of the working current and the numerical value of the working current.

The invention relates to a fault diagnosis method and device for a fuel cell, electronic equipment and a program product, and the method comprises the steps: determining the operation time of the fuel cell, inputting the operation time into a preset average monomer voltage self-adaptive model, a preset monomer voltage standard deviation self-adaptive model and a preset impedance self-adaptive model to obtain an average monomer voltage reference value, a monomer voltage standard deviation reference value, a high-frequency impedance reference value and an intermediate-frequency impedance reference value; calculating a first difference value between the actual average monomer voltage and the average monomer voltage reference value, a second difference value between the actual monomer voltage standard difference value and the monomer voltage standard difference reference value, a third difference value between the actual high-frequency impedance and the high-frequency impedance reference value, and a fourth difference value between the actual intermediate-frequency impedance and the intermediate-frequency impedance reference value; a fifth difference value between the actual anode inlet and outlet pressure difference and the anode inlet and outlet pressure difference reference value; and diagnosing the current state of the fuel cell based on the first difference value, the second difference value, the third difference value, the fourth difference value and the fifth difference value.

The invention provides an output negative voltage protection circuit applied to an N-type power device linear voltage regulator. The output negative voltage protection circuit comprises a voltage comparator, a current comparator, an error amplifier, a buffer driver, a power device MP, a resistor R1, a resistor R2, a resistor Rload and a capacitor Cout. The method comprises the following steps: acquiring a voltage difference between an S-pole output voltage Vout of a power device MP and a reference voltage Vos through a voltage comparator, converting the voltage difference into a current signal Ieg, and comparing the current signal Ieg with a reference current Ios through a current comparator to generate a current signal Ilim; adjusting the output of an error amplifier according to the current signal Ilim, and dynamically adjusting the G pole voltage Vgate of the power device MP; when the output voltage Vout is lower than the reference voltage Vos, the G pole voltage Vgate is pulled down to turn off the power device MP through the current signal Ilim, and protection of the power device MP is achieved.

Systems and methods as described herein may take a variety of forms. In an example, a circuit includes a first voltage stepdown module and a second voltage stepdown module. The first voltage stepdown module has a supply voltage and a first reference voltage as inputs, and an intermediate stepped down voltage as an output, the intermediate stepped down voltage being electrically coupled to a feedback input of the first voltage stepdown module. The second voltage stepdown module includes a low-dropout voltage regulator having the intermediate stepped down voltage and a second reference voltage as inputs and a target voltage as an output.

The utility model discloses a shock absorption type micro differential pressure switch, which comprises a signal end protection installation plastic shell and a pressure cavity low-pressure end shell, the pressure cavity low-pressure end shell is fixed at the lower end of the signal end protection installation plastic shell through a bolt, and a sheath lead cable is fixedly arranged on one side of the signal end protection installation plastic shell. A wiring terminal is fixedly arranged on one side of the sheath wire cable, and a shock absorption mechanism is arranged between the signal end protection installation plastic shell and the pressure cavity low-pressure end shell. In the process of the utility model, the ball head thread transmission idle rod does not directly push the spherical button, the shock absorption pressure spring needs to overcome the pre-tightening force of the shock absorption pressure spring to deform, and a period of time is needed in the process of pushing the spherical button to overcome the pre-tightening force of the shock absorption pressure spring, so that the effect of eliminating differential pressure fluctuation in the time process is achieved; and the spherical button pushes the microswitch to perform on-off switching so as to output a stable pressure difference switching signal to the outside.

The invention discloses a pre-charging control method, an energy storage device, electronic equipment and a storage medium. The pre-charging control method is applied to the energy storage device, the energy storage device comprises a plurality of pre-charging branches, and the pre-charging control method comprises the steps of obtaining a battery module voltage of a battery module and a device voltage of an external device; determining an equipment pre-charging branch according to the battery module voltage, the equipment voltage and the allowable voltage of each pre-charging branch; switching on an equipment pre-charging branch and timing, and acquiring a pre-charging voltage difference between the voltage of the battery module and the voltage of the equipment when the equipment pre-charging branch is switched on; and according to the timing duration and the pre-charging voltage difference, determining whether pre-charging is completed, and when pre-charging is completed, controlling the pre-charging branch circuit of the device to be switched off and controlling the charging and discharging branch circuit to be switched on. According to the embodiment of the invention, the pre-charging branch of the equipment is determined according to the voltage difference between the voltage of the battery module and the voltage of the equipment, the use requirements of users in different scenes are met, the pre-charging branch is prevented from being damaged, and the user experience is improved.

The embodiment of the invention provides a clamping circuit and a storage and calculation integrated device. The clamping circuit comprises a clamping branch module, an amplifier module, a feedforward sampling module and a feedback sampling module, and the feedback sampling module is configured to sample a first voltage difference between a clamping reference voltage and an ideal clamping voltage received in a first working state stage to generate a feedback output; the amplifier module is configured to amplify feedback output received from the feedback sampling module and then output the amplified feedback output to the feed-forward sampling module; the feed-forward sampling module is configured to sample a second voltage difference between the voltage of the output end of the amplifier module and the first reference voltage to generate feed-forward output; the clamping branch module is configured to clamp the clamping node to an ideal clamping voltage according to the feed-forward output in a second operating state. The clamping circuit can eliminate quiescent current errors caused by input voltage offset and voltage mismatch of the clamp itself.

The present invention provides a charge pump circuit and an electronic device, wherein the circuit includes a voltage control module and a charge pump, wherein the voltage control module includes a comparison unit and a voltage control unit. The charge pump circuit is used to compare and process the boost voltage and the reference output voltage to obtain a first comparison signal, and to compare and process the first comparison signal with the floating ground voltage of the first node to obtain a second comparison signal; the first end of the voltage control unit receives the functional voltage, and the second end is coupled to the first node, and the first node is also grounded through a tail current source. The conduction degree of the voltage control unit is controlled by the second comparison signal to control the voltage of the first node, thereby controlling the voltage value of the floating ground voltage. The input end of the charge pump receives the functional voltage, and its ground end is coupled to the first node. The charge pump is used to boost the functional voltage and output the boost voltage. The rail voltage difference of the working voltage of the charge pump of the present invention is small, so that the voltage stress of the charge pump is small and the EMC performance is good.

The invention provides a voltage regulation control method and system for a new energy station. The voltage regulation control method for the new energy station comprises the following steps: calculating a corrected voltage drop value according to the voltage of a high-voltage bus prime mover side of a grid-connected point, a first voltage difference compensation amount and a second voltage difference compensation amount; calculating a system equivalent impedance value according to the corrected voltage drop value and the first electrical information value and the second electrical information value of the reactive voltage state of the generator set of the grid-connected point; according to the first electrical information value, a regulation voltage target instruction value and the system equivalent impedance value, determining a reactive target regulation variable; and according to the reactive target adjusting quantity, controlling the reactive equipment of the station to carry out adjustment, wherein the second voltage difference compensation amount is positively correlated with the phase angle difference and the amplitude difference between the voltage of the high-voltage bus generator set side and the voltage of the prime motor side. According to the embodiment of the invention, the reactive power regulation error can be reduced, and the regulation period can be shortened.

Load sharing techniques for voltage regulators. In an example, the techniques may be implemented in an LDO voltage regulator configured to provide load sharing with a single driver for internal and external pass elements using a pair of variable voltage dividers to adjust the load sharing based on load current. In other examples, a calibrated voltage source can be used to replace one of the variable voltage dividers. Calibration circuitry and methodologies for determining the value of the calibrated voltage source are also described. In still other examples, a single variable voltage divider can be used, with no calibrated voltage source, by constraining the external pass element to be weaker than the internal pass element. In any such examples, the internal and external pass elements can be implemented, for instance, with either n-type or p-type power transistors, and with similar transistor technologies or diverse transistor technologies (e.g., FETs and BJTs).

The invention discloses a voltage coupling layered power flow regulation and control method based on a dual-core phase-shifting transformer, and relates to the technical field of power flow control of a power system, and the method comprises the steps: building a phase-shifting transformer amplitude relational expression based on a voltage prediction model, and dynamically outputting an optimal gear combination to eliminate a loop closing point voltage difference; a Thevenin equivalent model is introduced to predict a bypass impulse current constraint condition, and gear optimization and impulse current verification are completed before loop closing; taking the deviation minimization of the load side voltage and a rated value as an optimization target, and predicting a voltage change track by adopting an iterative optimization mechanism and combining with a local gear action set; voltage fluctuation threshold limitation in the exit strategy is fused into an iteration process, and an exit path is synchronously optimized in voltage regulation and control. According to the method, an iterative optimization mechanism and a voltage prediction model are adopted, large-range adjustment and high-precision control of the compensation voltage are achieved, the impact current risk of loop closing operation is reduced through synchronous optimization of a pre-regulation strategy and an exit path, and the continuity and stability of power grid operation are guaranteed.