541 results about "Power factor" patented technology

The invention discloses a micro-grid power control method, system and device based on fuzzy modulation and a storage medium, and relates to the technical field of intelligent grid integration of a photovoltaic system and a micro-grid, and the method comprises the steps: firstly obtaining the real-time power data of a photovoltaic system, carrying out the control processing through fuzzy logic, and calculating a reference instruction; according to the reference instruction, hysteresis time is dynamically adjusted through modulation hysteresis control, and an inverter switching signal is generated; converting direct current into alternating current based on the switching signal and a power switching device, injecting the alternating current into the micro-grid, calculating active and reactive power reference values, ensuring that the system operates according to a unit power factor, and giving active power to the reference value; according to the method, the power control precision and adaptability of the micro-grid are improved, excessive switching of the inverter is avoided, loss is reduced, the service life is prolonged, power matching and stable transmission are achieved, reactive loss is reduced, bus voltage is stabilized, harmonic waves can be reduced, the electric energy quality is improved, and efficient and stable operation of the micro-grid is guaranteed.

The invention discloses a variable frequency driving device energy recovery control system based on direct power supply of a high-voltage power grid, and relates to the technical field of electrical transmission and energy recovery control. Updating the power grid impedance model in real time by using a complex impedance calculation method; load operation state parameters are dynamically adjusted in combination with motor end output power, rotating speed change and torque calculation; according to the method, regenerative energy is accurately calculated, a feedback path is adjusted according to voltage fluctuation and frequency deviation of a power grid, a feedback current fluctuation ratio and a power factor are monitored, a feedback path conduction proportion is optimized in real time, when the current is unstable or the power factor is abnormal, a suboptimal path is automatically switched, and continuous and stable operation of a system is guaranteed; according to the invention, the energy feedback efficiency and the power grid compatibility of the high-voltage power grid variable-frequency driving device are effectively improved, and the method is suitable for energy feedback application of a high-power motor driving system.

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 provides a method and a system for evaluating, regulating and controlling operation stability and electric energy quality of an active transformer area based on edge calculation. The operation information such as low-voltage side voltage and current is collected through the area side edge calculation terminal, the indexes such as the load rate, the power factor, the three-phase unbalance degree, the voltage deviation and the voltage harmonic distortion rate are calculated, and the operation stability and the electric energy quality of the area are comprehensively evaluated after scoring according to a preset rule. And a distributed power supply, an energy storage device and a reactive power compensation device in the transformer area are regulated and controlled according to an evaluation result, so that the operation stability and the electric energy quality are improved. The method can comprehensively reflect the operation stability and the electric energy quality of the transformer area, and is beneficial to improving the operation stability and the power supply quality.

The invention discloses an electric carbon coupling carbon flow calculation method, system and device and a medium. The method comprises the steps of obtaining a real-time power curve of a power transmission line and corresponding current, resistance and power factor multi-source operation data; segmenting the real-time power curve according to a time window, and extracting a power dynamic feature set in each time period based on a current change trend; calculating the energy loss of the power transmission line in each time period according to the multi-source operation data, and generating a carbon emission factor calibration result in combination with the difference between a reference carbon emission factor and the energy loss; determining a carbon flow attribution result of each power generation node in each time period based on the carbon emission factor calibration result and a power factor curve of the power generation node; and calculating a comprehensive carbon flow value of each power generation node, and summarizing to obtain a carbon flow calculation result of the power system. According to the method, the real-time performance, the accuracy and the physical consistency of carbon flow calculation are remarkably improved.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.

The invention discloses a control method and device for a quasi-Z-source network inverter circuit, an inverter and a medium. The control method comprises the following steps: firstly, acquiring a direct-current chain voltage of a quasi-Z-source network, an instantaneous output power of an IPM module and an input voltage of an alternating-current power supply access module; determining an initial reference current according to the instantaneous output power and the input voltage; then, according to the direct-current chain voltage and a preset voltage threshold value, current correction is determined; then, sampling the input voltage to obtain voltage phase information, and correcting the initial reference current according to the voltage phase information and the current correction amount to obtain target reference current; according to the embodiment of the invention, a target reference current is generated, a PWM modulation signal is generated according to the target reference current, and an IPM module is driven according to the PWM modulation signal, so that the inductive current of a first inductor reaches the target reference current, and therefore, the power factor of the Z-source network inverter circuit can be effectively improved under the condition that an alternating current power supply is used as input.

The invention discloses a double-voltage adaptive rectification PFC (Power Factor Correction) circuit structure and an electric flame stove. The double-voltage adaptive rectification PFC circuit structure comprises an EMI (Electro-Magnetic Interference) filtering unit, a voltage doubling rectification unit, a full-bridge rectification unit, a circuit switching control unit, a startup protection unit and a power factor correction unit. According to the circuit switching control unit, through conversion of full-bridge rectification or voltage-multiplying rectification, adaptability to commercial power of two different voltages is achieved; according to the power-on protection unit, when 220V mains supply is input, after the circuit voltage is stabilized, the relay RLY2 is completely switched on, and soft start protection is achieved; according to the invention, the MOS tube Q1 / Q2 is alternately connected and disconnected in a time sequence, so that the inductor L2 stores energy or discharges, the capacitor C22 is charged or discharged, the power factor correction unit outputs stable high-voltage electricity to a rear-end circuit or a load, when the MOS tube Q2 is connected, the resistance is zero, the superposed high-voltage electricity is transmitted to the rear-end circuit when the potential of the inductor L2 discharges, and low-loss energy conversion is realized.

The invention relates to the technical field of transformer intelligent optimization compensation, in particular to an electric energy quality compensation method and equipment for new energy access to a power grid, and the method comprises the steps: connecting a dynamic voltage compensation converter in series at the low-voltage side of a transformer, and connecting a high-power bidirectional converter in parallel at the load side of a terminal, acquiring the voltage of the low-voltage side of the transformer at each moment in each period, and recording the voltage as transformer voltage; acquiring load current and load voltage at each moment in each period of the load side of the terminal; determining the influence weight of harmonic disturbance, the influence weight of reactive power disturbance and the influence weight of voltage out-of-limit in each period; constructing a target function; and obtaining an optimal power factor, each harmonic current component and each transformer voltage in the current period by utilizing an intelligent optimization algorithm and combining the objective function, and respectively performing transformer voltage compensation, reactive compensation and harmonic current compensation on the current period. Therefore, the overall stability of electric energy quality is improved.

The invention relates to a single-stage AC-DC converter and a control circuit. The single-stage AC-DC converter comprises a filter, an input rectifier, a filter capacitor Cin, a first switch bridge arm, a second switch bridge arm, a capacitor Cb, an inductor Lb, a resonant cavity formed by a resonant inductor Lr and a resonant capacitor Cr, a transformer T, an output rectifier and an output capacitor Co. According to the invention, a traditional two-stage AC-DC converter and a control circuit are simplified. Compared with a single-stage AC-DC converter in the prior art, the problem that the current of a resonant cavity is too large can be solved only by adding one inductor, meanwhile, the control strategy is simple, the frequency range conversion of a switching tube is small, and soft switching of the switching tube is easy to achieve, so that high efficiency is easy to obtain, input current can be corrected to achieve a high power factor, and the power factor is high. And the output voltage ripple is small, and the method has remarkable engineering application value and market prospect.

The invention relates to the technical field of intelligent operation of a power distribution network, in particular to an intelligent three-phase imbalance treatment method, which comprises the following steps of: firstly, acquiring three-phase current, three-phase voltage and electrical characteristic quantity of each single-phase load, and carrying out commutation adaptability evaluation on the load based on a real-time power factor, a current harmonic distortion rate and a load power flow direction; and calculating the three-phase unbalance degree of each power supply branch, identifying an extreme branch with the unbalance degree exceeding the standard, and screening out loads with optimal commutation adaptability parameters to form a candidate load set. And generating a commutation priority sequence for the candidate load through a historical commutation frequency and real-time contribution degree two-factor model. And triggering zero-millisecond seamless commutation under the conditions of meeting a safe voltage threshold and equal voltage time, verifying a switching result after commutation, limiting the number of commutation times of single treatment, and monitoring the three-phase unbalance degree in real time until the three-phase unbalance degree is recovered to a qualified range. According to the invention, the accuracy and safety of the commutation decision can be improved, and the dynamic balance adjustment of the three-phase load is realized.

The invention provides an active support control method for a single-phase cascaded optical storage grid-connected system, aiming at challenges caused by fluctuation, intermittency and reverse peak regulation of photovoltaic resources in a photovoltaic energy consumption process and the problem of insufficient active support capability of a micro-grid for a large power grid under the access of high power electronic equipment. The low-voltage photovoltaic units are boosted by inverter cascading, and each photovoltaic unit is equipped with stored energy to stabilize photovoltaic fluctuation. A grid-side current source inverter is controlled by a virtual synchronous generator (VSG), so that the active support of the inverter on a large power grid frequency is ensured; other voltage source inverters adopt power factor angle droop control, and an active power compensation item is introduced, so that self-synchronization between the inverters and accurate power equalization between energy storage units are ensured. Compared with a traditional control method, the method can control active power and reactive power at the same time, has frequency supporting capacity, is low in communication cost, and provides a new solution thought for the problem of large-scale photovoltaic grid connection.

The invention relates to the technical field of intelligent measurement switch testing, in particular to an electric energy error testing method based on an intelligent measurement switch, which comprises the following steps of: S1, carding multi-dimensional working conditions of the intelligent measurement switch, forming a working condition classification table, and constructing a testing management platform at the same time; s2, performing synchronization source precision calibration and compensation model construction according to the working condition classification table and the test management platform; when the method is used, errors caused by the environment and aging are conveniently reduced through synchronous source calibration, an environment error compensation model and an aging error compensation model, the problem that an existing method cannot correct systematic deviations is solved, full-range changes of loads, voltages and power factors are adapted by means of a working condition automatic identification and parameter dynamic matching mechanism, and the accuracy of the system is improved. The test adaptability is improved, the double models are synchronously called through the real-time data bus, the problem of time mismatch caused by environment and aging errors is solved, the correction response speed is improved conveniently, and a rapid load fluctuation scene is adapted.

The utility model provides a voltage sag resistant circuit and a motor, the circuit comprises an energy storage module, the energy storage module comprises a first capacitor, a second capacitor, a first diode, a second diode and a third diode, the second end of the first capacitor is connected to the cathode of a first diode, and the anode of the first diode is grounded; the cathode of the second diode is connected to the energy exchange end of the circuit, the anode of the second diode is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded; the anode of the third diode is connected between the first capacitor and the first diode, and the cathode of the third diode is connected between the second diode and the second capacitor. According to the anti-voltage sag circuit and the motor, the motor can be kept running continuously when voltage sag occurs. In addition, the circuit and the motor are small in size and low in cost, and the power factor of the system can be improved.

The invention provides a dynamic reactive compensation ad hoc network control system and method for a power transmission line. The control method comprises the steps that a self-repairing network is constructed through a scoring algorithm after compensation nodes are self-initialized; acquiring data such as voltage and current in real time, and preprocessing and transmitting; the central control unit generates a dynamic compensation strategy based on an NSGA-II multi-objective optimization algorithm in combination with voltage stabilization, a power factor, active loss, load balancing and renewable energy consumption targets, and edge calculation realizes local reactive rapid adjustment through fuzzy logic; faults are monitored in real time and rapidly isolated, network topology is reconstructed based on residual nodes, a compensation strategy is recalculated, and system self-healing is achieved. The communication reliability and flexibility are improved through a distributed ad hoc network architecture, the single compensation defect is solved through multi-target collaborative optimization, the method is suitable for a complex power grid containing a distributed power supply, the voltage stability is remarkably improved, the line loss is reduced, and an efficient and reliable reactive compensation solution is provided for an intelligent power grid.

The invention discloses a micro-grid multi-objective optimization scheduling method considering an electric vehicle and energy storage, and the method comprises the steps: building mathematical models of a photovoltaic power generation device, a wind power generation device and an energy storage device, constructing a cost function, employing an SOC model for energy storage, and setting the upper and lower limits of SOC and the charging and discharging efficiency; modeling the travel behavior of the electric vehicle based on Monte Carlo simulation to generate a load demand of the electric vehicle; and constructing an optimization model with the goal of minimizing energy loss and voltage deviation, and solving under the conditions of power balance constraint, generator capacity constraint, voltage and phase angle constraint, power factor constraint and energy storage SOC constraint. According to the method, accurate optimization scheduling under complex power demand and power generation conditions is realized, and an intelligent micro-grid solution is provided.

The invention discloses an electrified railway hybrid electric energy quality treatment device which comprises a balancing transformer, a TCLC branch and an active electric energy quality regulator. The balancing transformer comprises a primary side end and a secondary side end, the primary side end is connected with a three-phase public power grid in the traction substation, the secondary side end is provided with a series winding used for being connected with an alpha-phase traction network and a closed-loop triangular winding used for being connected with a beta-phase traction network, and the closed-loop triangular winding is provided with a first self-coupling tap and a second self-coupling tap; the first self-coupling tap, the second self-coupling tap and the remaining vertexes are connected into the TCLC branch in parallel; and the other end of the TCLC branch is connected with an IGBT switch bridge arm of the active power quality regulator. The invention further provides an electrified railway hybrid power quality management control method. According to the device cooperation control method provided by the invention, the overall cost and the installation space of the device are effectively reduced on the premise that the problems of negative sequence, low power factor and harmonic waves existing in the traction substation are comprehensively treated.

The invention discloses a voltage safety margin and dynamic reactive power reserve evaluation method and device, equipment and a medium, and relates to the field of reactive power voltage control of a power system, and the method comprises the steps: carrying out the clustering of fault scenes through employing historical fault data, and obtaining a plurality of fault scene clusters; establishing a transient voltage safety evaluation model for each fault scene cluster, and evaluating the safety margin of each fault scene cluster by using a safety domain boundary function obtained based on the transient voltage safety evaluation model; establishing a power recovery mechanism dynamic model taking the load equivalent resistance as a state variable; and on the basis of meeting the safety margin, the system reactive power reserve and the minimum reactive power reserve, calling a power recovery mechanism dynamic model and introducing a cotangent value of a power factor to evaluate the voltage support capability of a corresponding fault so as to evaluate the voltage safety margin and the dynamic reactive power reserve. The evaluation efficiency can be improved.

The invention relates to the field of clean energy electrolysis hydrogen production, in particular to a three-section electrolytic bath hydrogen production power supply system and a power supply control method thereof. According to the system, an alternating current bus module is connected with three-phase alternating current and provides a three-phase alternating current power supply; the power supply conversion module comprises three power supply conversion units, the three power supply conversion units are jointly connected to the alternating current bus module in parallel, and each power supply conversion unit converts the three-phase alternating current power supply into a working direct current power supply; the three-section type electrolytic bath comprises three sub-electrolytic baths which are connected in series, and each sub-electrolytic bath is correspondingly connected with one power supply conversion unit to obtain the working direct-current power supply; the power supply conversion unit comprises a rectification circuit, a three-level BUCK circuit and a resonance LLC cascade circuit which are connected in sequence. According to the invention, accurate power distribution and independent decoupling control of a load section are realized through the independent modular power supply; meanwhile, harmonic interference is restrained, the power factor is improved, and device stress and line loss are reduced.

This application relates to a transformer, a power supply circuit, and a vehicle. The transformer includes a core module and a winding module. A first winding suitable for connecting a power factor conversion circuit, a second winding suitable for connecting a high-voltage battery pack, and a third winding suitable for connecting a low-voltage power supply side share the core module. This significantly reduces the number of transformers, improves the integration of the transformer, and reduces the space occupied in the vehicle.

The application discloses a method for reducing energy consumption by optimizing production of a natural power factor and secondary voltage of a ferrosilicon electric arc furnace, and belongs to the technical field of ferrosilicon smelting. The method solves the problems of low power factor, blind secondary voltage regulation, high power consumption and poor furnace stability in the traditional process. The method comprises three-stage operation methods. The first stage is a voltage lifting and furnace condition adapting stage, the second stage is a voltage stabilizing and parameter coordinating optimizing stage, and the third stage is a parameter solidifying and efficiency enhancing stage. The method takes the improvement of the operating resistance of the electric arc furnace as the core, controls the whole process in stages, constructs a benign smelting cycle of "high voltage-low current-high power factor", realizes the synchronous optimization of the natural power factor and the secondary voltage, and greatly improves the economy and production stability of the ferrosilicon smelting.

This application discloses a power supply circuit based on a three-phase power supply, and a method for simultaneously achieving power factor tracking and dynamic boost / buck conversion. The power supply circuit includes an information acquisition module and a power supply circuit unit, the power supply circuit unit includes three circuit groups formed by three phases connected to a three-phase power supply, and a control center for controlling the operating state of the three circuit groups. Each circuit group includes an input rectifier module, inductor, capacitor, switch and its controller, transformer, and output half-wave rectifier module. The output terminals of the three circuit groups included in the power supply circuit unit are connected in parallel or in series to solve the ripple problem and improve power conversion efficiency. The aforementioned power supply circuit adjusts the peak value of the input current at a high frequency, further adjusting the switching frequency and duty cycle, and controlling the charging and discharging time of the inductor to achieve power factor tracking, while simultaneously enabling dynamic adjustment of boost and buck voltage to meet load demands, effectively reduce costs, have low energy loss, and have high power conversion efficiency.

This invention relates to the field of electricity meter operation monitoring technology, specifically to an intelligent analysis system for electricity meter operation faults based on sensor monitoring. The system includes: an operation status acquisition module, which collects the voltage, current, active power, reactive power, and power factor of the electricity meter and obtains the operation status at each moment; a periodic analysis module, which uses active power as a load parameter and obtains a basic period based on the load parameters within a preset time period, then segments the preset time period to obtain different time periods and obtains the period fit at each moment; and a fault monitoring module, which obtains the comprehensive rationality of the load linkage deviation at each moment; and uses the comprehensive rationality of the load linkage deviation at a moment and the period fit to correct the squared Mahalanobis distance corresponding to the data points composed of voltage, current, reactive power, and power factor at that moment, and uses the corrected squared Mahalanobis distance for fault monitoring. This application can effectively monitor the operation faults of electricity meters.

A low voltage ride through detection method and device are provided. The low voltage ride through detection method comprises: determining an adjustment value of a preset parameter of a power grid based on a grid voltage, wherein the preset parameter comprises at least one of current, current frequency and power factor angle; adjusting the preset parameter of the power grid based on the adjustment value; and detecting whether the power grid satisfies a low voltage ride through condition based on the grid voltage after the preset parameter of the power grid is adjusted, thereby enabling a wind power generator to accurately identify a power grid fault under a weak power grid to enter low ride through, while avoiding instability of a power grid fault ride through system under a weak power grid.

The invention relates to the technical field of control circuits, in particular to a power conversion circuit and a lighting device. The power conversion circuit comprises an input end, a rectifier module, a power inductor module and a parallel module. The rectifier module is connected with the input end; the power inductor module comprises a first end, a second end and a third end located between the first end and the second end; the parallel module is connected between the rectifier module and the power inductor module, the parallel module comprises a first conduction loop and a second conduction loop, one end of the first conduction loop is connected with the rectifier module, and the other end of the first conduction loop is connected with the third end of the power inductor module; one end of the second conduction loop is connected with the rectification module, and the other end is connected with the second end of the power inductance module. The power conversion circuit can effectively improve the power factor of the circuit, and can be suitable for isolated / non-isolated circuits with different structures.

The application discloses an asymmetric phase-shifting control method suitable for a half-wave shaping MMC, and can realize wide-range operation energy balance of a converter. The method is characterized in that, in a 2pi period, a commutation unit switching function and a multi-level unit modulation voltage are not switched in a half-wave period pi, but in a positive half-wave mode, [0, pi] is taken as a reference to expand and shift an angle theta to the left and right, that is, the interval is [-theta, pi+theta], and in a negative half-wave mode, [pi, 2pi] is taken as a reference to shrink and shift an angle theta to the left and right, that is, the interval is [pi+theta, 2pi-theta]. The application adopts an asymmetric phase-shifting modulation method, generates and reverses polarities of two asymmetric partial sine waves through a commutation switch cooperating with a multi-level unit, and obtains a complete multi-level sine wave on an alternating current side. The application can eliminate the limitation of a power factor angle on a phase-shifting angle while realizing wide-range energy balance of the converter, is only affected by a modulation ratio, and compared with symmetric phase-shifting modulation, is beneficial to simplifying commutation control logic when the system is in a wide-range reactive power regulation, and has better engineering application value.

The invention relates to an urban power distribution network reactive power optimization method and system, and the method comprises the following steps: obtaining historical load data, constructing a daily power factor scene matrix, and extracting a reactive power utilization typical scene; based on the typical scene of reactive power utilization, reactive power compensation points are screened by adopting composite voltage stability margin indexes, and the composite voltage stability margin indexes comprise a capacitive composite margin and an inductive composite margin which are respectively used for screening the capacitive reactive power compensation points and the inductive reactive power compensation points; and constructing a reactive power optimization model, solving the reactive power compensation capacity of the reactive power compensation point, and completing reactive power compensation configuration. Compared with the prior art, the composite voltage stability margin index considering the system voltage stability level is adopted, the capacitive reactive compensation point and the inductive reactive compensation point can be screened according to the capacitive composite margin and the inductive composite margin, the system stability is comprehensively considered, and inductive compensation and capacitive compensation can be achieved at the same time.

The invention relates to the field of pulse width modulation of power electronic converters, in particular to a pulse width modulation method and system for minimizing switching loss, which are suitable for minimizing switching loss under any modulation ratio and power factor of a three-level neutral-point clamped inverter topology. The three-level space vector diagram is divided into 6 large sectors and corresponding 24 areas according to a nearest three-vector synthesis principle. All possible five-segment switch sequences in different clamping phases of each region are obtained according to a nearest three-vector synthesis principle, the obtained five-segment switch sequences are selected according to a certain rule and checked according to a corresponding rule, and zero-sequence component calculation is performed on the five-segment switch sequences in different clamping phases. And finally, selecting a zero-sequence component under the corresponding clamping phase according to the current maximum phase or secondary maximum phase. And meanwhile, modeling is carried out on the switching loss of the switching loss minimization DPWM modulation and the switching loss of the traditional DPWM1 modulation, and the effectiveness of the pulse width modulation method is verified through comparison.

The invention provides a reactive compensation method and system, electronic equipment and a storage medium, and relates to the technical field of reactive compensation, and the method comprises the steps: calculating the power factor of each phase in a power grid, and obtaining a three-phase power factor; calculating the duration when the power factor of each phase is less than a preset input threshold power factor; when the duration time reaches a preset input delay time, searching a target matching split compensation type capacitor according to a split compensation strategy, and inputting the target matching split compensation type capacitor to perform reactive compensation; respectively recording the moment when the target matching separate compensation type capacitor is put into each phase and the current power factor to obtain a three-phase separate compensation input moment and a three-phase previous power factor; and when the maximum input time difference in the three-phase separate compensation input moments is smaller than the preset proportion of the preset input delay time, switching to a common compensation strategy, taking the latest moment in the three-phase separate compensation input moments as a starting point, and searching a target matching common compensation type capacitor for reactive compensation based on the three-phase pre-power factor after the preset input delay time is up. Therefore, the reactive compensation effect is optimized.

The invention discloses a reactive power optimization control method suitable for a series resonance dual active bridge, relates to the technical field of power electronic converter control, and solves the problem that an effective compensation scheme is not provided for an incomplete soft switching problem caused by dead time in the prior art. And the requirement of all-working-condition efficient operation in engineering application is difficult to meet. Based on triple phase shift control, the optimal phase shift angle combination is accurately solved through the power factor Lagrange function and the KKT condition, the reactive power of the primary side or the secondary side can be counteracted in a targeted manner, and the energy circulation of the resonant cavity is effectively inhibited; meanwhile, soft switching boundary analysis and critical phase compensation are combined, so that zero-voltage switching of all main switching tubes in a full-voltage gain and full-load range can be ensured, and switching loss is reduced; and a mode switching mechanism is designed in control logic to adapt to dynamic working condition response requirements, so that the energy transmission efficiency and working condition adaptability of the series resonance dual-active bridge converter are greatly improved.