500 results about "Circulating current" patented technology

The invention relates to the technical field of cable fault diagnosis and positioning, in particular to a cable fault positioning method and system based on multi-source data space-time correlation, and the method comprises the steps: obtaining partial discharge, traveling wave and temperature multi-source monitoring data from a high-voltage cable-overhead line hybrid power transmission network; on the basis of space-time correlation analysis of partial discharge and temperature data, heat-electricity associated defect points are calibrated; comparing traveling waves of the cable and the overhead line, and identifying and inhibiting cross-domain propagation interference; positioning the traveling wave data which are not identified to obtain temporary coordinates, judging fault characteristics by fusing information such as sheath ring current and the like, and comparing the temporary coordinates with defect points to generate matching identification; and inputting multi-dimensional information such as fault features, defect matching identification and temperature into the fusion model, calculating the confidence coefficient of a fault mode, and outputting a cross validation positioning result. According to the invention, high-reliability positioning of mixed line faults and active early warning of insulation defects are realized by carrying out space-time correlation and fusion decision on multi-source monitoring quantities such as traveling waves, partial discharge, circulation, temperature and the like.

This invention discloses a method and system for suppressing capacitor voltage fluctuations in SiC MMC submodules, belonging to the field of electronic power technology. Based on the analysis results of the optimal broadband harmonic circulating current injection boundary and order for SiC MMC submodules, an optimized model for submodule capacitor voltage fluctuations is determined that simultaneously injects 2nd, 4th, and 8th harmonic circulating currents and 3rd harmonic voltages, which can fully utilize the higher control bandwidth characteristic of SiC MMC. By solving the optimized model for submodule capacitor voltage fluctuations, the amplitude and phase of the reference values ​​of the 2nd, 4th, and 8th harmonic circulating currents to be injected, as well as the amplitude and phase of the corresponding 3rd harmonic voltage, are determined. Then, by injecting 2nd, 4th, and 8th harmonic circulating currents and jointly injecting the 3rd harmonic voltage, broadband harmonic joint injection is achieved, reducing the capacitor voltage fluctuations of the submodule and realizing a method for suppressing capacitor voltage fluctuations in SiC MMC submodules with high suppression effect.

The invention is suitable for the technical field of flexible power distribution of a power system, and discloses a modular multilevel converter multi-objective optimization method, system and device based on model predictive control and space vector modulation, and a medium. Obtaining an output current reference value and a circulating current reference value; obtaining a reference voltage vector based on the output voltage reference value, and screening out a plurality of groups of redundant voltage vector sequences through a space vector diagram; performing performance evaluation through rolling optimization by combining each redundant voltage vector sequence with a multi-target cost function to obtain an optimal voltage vector sequence; and on the basis of the optimal voltage vector sequence and the corresponding duty ratio, a switching signal for driving each sub-module switching device of the MMC is generated, and multi-target cooperative control is realized. The three targets of reference output current tracking, circulating current suppression and sub-module capacitor voltage balance are met, and the dynamic response capability, efficiency and reliability of MMC system operation are comprehensively improved.

The invention discloses a dynamic virtual impedance control method for multi-machine parallel connection of a network construction type energy storage converter, and belongs to the technical field of power electronics. The method aims to solve the problem that accurate reactive power distribution, circulating current suppression, dynamic response and voltage precision are difficult to consider in a multi-machine parallel system through fixed parameter virtual impedance. A dynamic adjustable virtual impedance module is introduced into the voltage outer loop output end of each converter, and virtual resistance and virtual inductance are calculated in real time based on locally measured output current, bus voltage change rate and adjacent machine reactive power deviation information; and the average reactive power of the system is estimated through a phase synchronization mechanism under the condition of no communication so as to realize multi-machine cooperation. According to the method, the reactive power distribution error is less than 5%, the bus voltage drop is less than 3%, the high-frequency circulating current is controlled within 5% of the rated current under all working conditions, and the dynamic performance and robustness of the system are remarkably improved.

The invention discloses a control method for eliminating low-frequency circulating current of a zero common-mode voltage modulation strategy. The control method is used for eliminating the inherent low-frequency circulating current problem of the zero common-mode voltage modulation strategy. Existing zero common-mode voltage modulation strategies all adopt repeated vector sequences, low-frequency circulating current is inevitably introduced, and the practicability of the method is seriously affected. Therefore, the invention provides a control method for adjusting the switching time sequence, and the method realizes the balanced symmetry of the polarity of the circulating current in any two adjacent carrier wave periods by exchanging the switching signals of the parallel bridge arms or reversing the switching signals of the same bridge arm, thereby eliminating the problem of low-frequency circulating current introduced by an asymmetric sequence. According to the method, by adjusting related bridge arm switching signals, alternating conversion of circulating current polarity is achieved, and an original vector time sequence of an existing zero common mode voltage modulation strategy is not damaged. Therefore, the method achieves the optimal common-mode voltage of an existing algorithm, and further eliminates the inherent low-frequency circulating current.

The invention discloses a power control method, system, equipment and medium for a modular multilevel converter, and belongs to the technical field of power electronics and power system application, and the method comprises the steps: collecting the bridge arm current, the sub-module capacitor voltage, the DC bus voltage and the AC side power of the modular multilevel converter; calculating a power error according to the AC side power and a power reference value, and calculating a sub-module capacitor voltage error according to the sub-module capacitor voltage and a voltage reference value; constructing a Lyapunov function comprising a plurality of control targets, wherein the Lyapunov function comprises a power error term, a sub-module capacitor voltage error term, a circulating current suppression term and a total energy balance term; and determining a control law on the basis that the Lyapunov function meets a stability condition, and controlling the modular multilevel converter according to the control law. According to the method, the coupling control problem of multi-terminal direct current system power distribution and sub-module energy balance is considered and improved.

The invention discloses a distributed cooperative voltage control method for a hybrid flexible traction substation group, and aims at solving the problems of output voltage cooperation, no-load circulating current suppression and multi-substation load distribution during networking operation of a plurality of hybrid flexible traction substations (HFTSS). Rapid synchronization of output voltage phases of the substations is achieved by introducing an average consistency algorithm, and nearby distribution of train loads among the traction substations is achieved by combining self-adaptive virtual impedance. According to the method, the capacity of the hybrid flexible traction substation for coping with the dynamic change of the external power grid voltage phase can be effectively enhanced, the loss of a contact network is reduced, the regenerative braking energy utilization efficiency is improved, and a feasible path is provided for large-scale application of a low-cost hybrid flexible traction power supply system and improvement of a cooperative control technology system.

The invention relates to the technical field of network construction type converters, in particular to a multi-machine parallel operation circulating current suppression method and system for a network construction type converter. By dynamically adjusting control parameters, cooperatively adjusting current and voltage and introducing a high-frequency impedance adjusting mechanism, generation of circulating current can be accurately inhibited in real time, and by obtaining the high-frequency impedance characteristic and the circulating current amplitude of each converter and generating the corresponding high-frequency impedance adjusting reference, the high-frequency impedance adjusting reference can be accurately adjusted. A high-frequency dynamic impedance adjusting model can be constructed according to power flow data, impedance parameters are further optimized, it is ensured that voltage output of each converter is kept consistent in a parallel system, and therefore the circulating current problem caused by voltage differences is avoided; ring current generation can be effectively reduced, and the electric energy quality and power distribution precision of the system are improved.

The invention provides a grid-connected and off-grid mode switching control method and device and an energy storage parallel operation system, and relates to the technical field of energy storage systems.The method comprises the steps that if the energy storage parallel operation system is not connected to mains supply within a preset voltage range, the energy storage parallel operation system is controlled to enter an off-grid mode; based on the first voltage characteristic information of the energy storage converter host, controlling the energy storage converter slave to adjust the first voltage parameter; if the electric supply in the preset voltage range is connected to the energy storage parallel operation system, controlling the energy storage converter host to enter a tracking pre-synchronization mode from an off-grid mode, controlling the energy storage converter host to track the electric supply and sequentially adjust the second voltage parameter, and controlling the energy storage converter host to track the energy storage converter host and sequentially adjust the third voltage parameter; and controlling the energy storage converter host and the energy storage converter slave to enter a grid-connected mode at the same time. According to the technical scheme, it is ensured that the voltage parameters of the host and the slave are consistent, parallel operation circulating current oscillation can be avoided to a great extent, and the possibility of system faults is reduced.

The invention discloses a method for determining control parameters of a network construction type wind-solar hybrid grid-connected system and electronic equipment. The method relates to the technical field of new energy control, and comprises the following steps: constructing a target function based on first control parameters corresponding to a plurality of units in the wind-solar hybrid grid-connected system; optimizing the first control parameter by taking a minimum function value of the target function as a target to obtain an optimized first control parameter; on the basis of the optimized first control parameters, second control parameters corresponding to the multiple units are optimized, and optimized second control parameters are obtained; and based on the voltage deviation, the angular frequency deviation and the dynamic compensation factor corresponding to the plurality of units, optimizing the third control parameters corresponding to the plurality of units to obtain the optimized third control parameters. According to the method, the technical problems of non-uniform reactive power distribution, serious circulating current and low dynamic response speed caused by different new energy unit types and line equivalent impedance differences are solved.

The invention discloses a multi-port DAB energy storage system directly connected with an elevator frequency converter bus and a cooperative control method of the multi-port DAB energy storage system, and is suitable for an elevator frequency converter direct-current bus direct-connection scene. Aiming at the defects in the aspects of elevator bus transient support, multi-branch extension and parallel operation safety access in the prior art, at least two DAB power branches are adopted, the low-voltage sides of the DAB power branches are connected into the same low-voltage direct-current source in parallel to realize current expansion, and the high-voltage sides of the DAB power branches are connected to a VFD direct-current bus through a parallel operation access switch to realize voltage expansion after being connected in series and laminated; the controller adopts fixed frequency phase shift control, and combines a two-line parallel operation or power-off time sequence and a zero-crossing residence strategy; through multi-branch phase interleaving, mutual exclusion amplitude limiting constraint, ZVS guarantee and a fault striding linkage mechanism, branch power balance, circulating current suppression and bus stable support are realized. According to the invention, the millisecond voltage of the bus can be efficiently suppressed, the response speed, the operation efficiency and the reliability of the system are improved, and the core requirements of elevator bus energy recovery and transient stability control are met.

This application provides an inverter carrier synchronization system, belonging to the field of inverter control technology. The system includes multiple inverter devices connected via cascaded communication. Each inverter device includes a CPLD unit, a drive unit connected to the CPLD unit, a fault output unit, and a fault identification unit. The CPLD unit generates or forwards a carrier synchronization signal. The first contact of the relay in the fault output unit outputs a fault status signal to the next-level inverter device. The first-level inverter device acts as the master, and the fault status signal output by any normal inverter device is low. When any inverter device loses power or malfunctions, its relay disconnects, causing the output fault status signal to be high. Upon detecting the high-level fault status signal, the next-level inverter device automatically switches to become the master of the downstream inverter device. This system effectively suppresses high-frequency circulating currents in the system, improving system operating efficiency and stability.

Implementations described herein are related to a diode driver that recirculates residual current from an operating current pulse in an inductor. Such recirculation produces a diagnostic current pulse to a diode array for measuring a voltage drop across a portion of the array. For example, after a controller charges an inductor of a diode driver to deliver operating current pulses to a portion of a diode array for illumination, the controller causes a residual current to remain and recirculate in the inductor. In some implementations, in response to the recirculating current reaching a monitoring threshold, the controller delivers a monitoring pulse to the portion of the diode array to measure a voltage drop across the portion of the diode array. In some implementations, the controller may infer defectivity in the portion of the array from such voltage drop measurements over time.

The invention discloses a transformer parallel operation circulating current suppression method and system based on a cloud edge collaborative architecture, and relates to the technical field of power grid control, and the method comprises the steps: an edge node collects the multi-source dynamic data of a parallel transformer in real time, and constructs a local dynamic impedance model of a single transformer; the cloud receives the multi-modal data uploaded by each edge node, inputs the multi-modal data into an LSTM-SVM hybrid model trained based on a historical database, generates an impedance prediction weight of each edge node, and issues the impedance prediction weight to the corresponding edge node; the edge node receives the impedance prediction weight and injects the impedance prediction weight into a local dynamic impedance model to generate a corrected dynamic impedance matrix; and calculating a circulating current suppression instruction according to the corrected dynamic impedance matrix, and executing real-time regulation and control based on the circulating current suppression instruction. According to the method, the impedance prediction weight is generated through real-time collection of the edge nodes and calculation of the cloud, the local dynamic impedance model is effectively corrected, and then the circulating current suppression instruction is accurately calculated.

The invention relates to the technical field of ice prevention and disaster reduction of high-voltage power transmission lines, and discloses a cascaded direct-current ice melting system of a high-voltage power transmission line, a control method and a device. The method comprises the following steps: inputting a test signal to the cascaded direct-current deicing system, and detecting the voltage and current of each node; calculating line impedance distribution based on the voltage and current of each node, and constructing a line equivalent model; calculating the minimum ice melting current based on the ice thickness monitoring data and the weather data, and calculating the output current of each ice melting device based on the minimum ice melting current and the line equivalent model; monitoring circulating current between systems, and calculating virtual compensation voltage based on the circulating current; and adjusting the output voltage of each ice melting device based on the virtual compensation voltage. The ice melting success rate, the safety of the system and the service life of the system can be improved.

A multi-port flexible interconnection device for distribution networks, and a control method and system thereof are provided. The multi-port flexible interconnection device includes a bipolar output inverter and a multi-port flexible interconnection module connected in series therewith. The multi-port flexible interconnection module includes multiple unipolar output inverters which share the same common connection bus and are connected in parallel, and AC output ports of each unipolar output inverter are interconnected with different feeders. By adjusting an AC output voltage in series between the feeders, active and reactive power decoupling control for each feeder is achieved. Energy balance for the entire device and its components is maintained by controlling an internal circulating current of the bipolar output inverter. The provided introduces the multi-port flexible interconnection module to interconnect multiple feeders in a distribution network, enabling flexible power interchange between feeders and facilitating a flexible AC distribution network featuring multi-terminal interconnection.

The utility model relates to the technical field of current monitoring, in particular to a high-voltage cable circulating current on-line monitoring and analyzing device which is provided with a shell, a touch screen, a power adapter, a bus circuit board, a current sampling board and an opening and closing current transformer. The bus circuit board is connected with at least one current sampling board, the current sampling board is connected with at least one opening and closing current transformer, and the opening and closing current transformer is installed on outgoing lines of an armor layer and a shielding layer of a to-be-monitored single-core cable. A to-be-monitored single-core cable is monitored by opening and closing the current transformer, monitored current is converted into digital signals through the current sampling board and transmitted to the bus circuit board, the bus circuit board stores and analyzes the digital signals and displays the digital signals to a user through the touch screen, and therefore current monitoring of the to-be-monitored single-core cable is completed.

The invention provides an operational amplifier. The operational amplifier comprises a bias module, a chopping module, an enhanced recovery folded cascode module and an output stage module, the enhanced recovery folded cascode module comprises a first input tube group, a second input tube group and a regulation resistor, grid electrodes of the first input tube group and the second input tube group are connected with the output end of the chopping module, a source electrode of the first input tube group is connected to one end of the regulation resistor, a source electrode of the second input tube group is connected to the other end of the regulation resistor, and a source electrode of the second input tube group is connected to the other end of the regulation resistor. The first input tube group and the second input tube group generate different gate-source voltages; the three-path current recovery structure comprises at least two folded node transistors, two circulating current mirror transistors and two shunt transistors, the ratio of the width-to-length ratios of the folded node transistors, the circulating current mirror transistors and the shunt transistors is (1 + x): z (1-x): y (1-x), the value of x is larger than 0 and smaller than 1, and y + z = 1; and the grid electrodes of the matching transistors are connected to the bias voltage provided by the bias module.

The invention discloses an optical storage integrated micro-grid management system and method, particularly relates to the technical field of hybrid energy storage power distribution control, and is used for solving the problem of high-frequency circulating current caused by dynamic response mismatch of a lithium battery and a super capacitor in the prior art. The method comprises the following steps: acquiring a micro-grid power instruction change rate and branch currents of a lithium battery and a super capacitor in real time; when the power instruction change rate exceeds a threshold value, determining a mismatch risk level according to the current internal resistance ratio; if a high risk is reached, synchronously extracting high-frequency components of two paths of current, and calculating a cross-correlation entropy of the high-frequency components through phase-space reconstruction to quantify a dynamic mismatch degree; constructing a dynamic circulating current suppression compensation function containing a cross-correlation entropy derivative damping term and an internal resistance ratio nonlinear proportional term based on the mismatch degree and the internal resistance ratio; superposing the function with an original power distribution instruction to generate a correction instruction; finally, the output of the hybrid energy storage unit is controlled through the bidirectional DC / DC converter, real-time active suppression of the dynamic circulating current is realized, the system efficiency is improved, and the service life of equipment is prolonged.

The invention discloses a repetitive control-based circulating current suppression method between grid-forming type energy storage units, and relates to the technical field of power electronics and control, the method adopts three rings of power, voltage and current to regulate and control a grid-forming type multi-machine parallel inverter, a repetitive controller is introduced into a current inner ring, and the repetitive controller is introduced into a current outer ring to control the circulating current between the grid-forming type energy storage units. The method has the advantages that periodic harmonic current is accurately tracked and suppressed, meanwhile, a narrow-band resonance circuit and LC filter state feedback and pole assignment design are introduced into a current loop, LC filter resonance peaks are effectively eliminated through LC filter state feedback and pole assignment, typical harmonic circulation in a parallel system is further suppressed through the narrow-band resonance circuit, and the harmonic current suppression efficiency is improved. Efficient suppression of circulation among the units and uniform distribution of power are further realized; according to the technical scheme, the stable operation of the system can be guaranteed, the power sharing capability and the grid-connected adaptability of the energy storage unit are improved, a complex distributed communication structure is avoided, and the operation reliability of the network construction type energy storage system in a complex power grid environment is improved.

The invention relates to the technical field of electric power, in particular to a power supply zero-sensing switching method and system based on phase real-time tracking, and the method comprises the following steps: collecting the communication connection state of each inverter node in a micro-grid group, constructing a communication topology model of the micro-grid group, and analyzing a sparse communication connection relationship among the nodes in the communication topology model, and generating a Laplacian matrix reflecting node connectivity according to the sparse communication connection relationship. According to the method, the system state can be comprehensively evaluated from the two dimensions of external alignment precision and internal stability, and misjudgment caused by a single index is avoided. Dual errors are input into a switching stability evaluation model to calculate a stability index, and a switching instruction is generated only when the index exceeds a grid-connected permission threshold value, so that quantitative decision and strict control of a grid-connected opportunity are realized, and the micro-grid and a main grid are highly synchronous in phase and frequency at the moment that a circuit breaker is closed; and transient impact and circulation at the switching-on moment are eliminated.

The invention discloses a battery pack circulating current suppression circuit and a control method thereof.The battery pack circulating current suppression circuit comprises a plurality of battery pack branches connected in parallel, a whole vehicle load, a charging interface and a BMS, each battery pack branch is formed by connecting a plurality of batteries in series, and one end of each battery pack branch is connected with a DCDC converter in series; and the DCDC converter adjusts the voltage of each battery pack branch circuit to be consistent, so that no-voltage-difference output among the battery pack branch circuits connected in parallel is realized. The circuit and the method can avoid generation of circulating current of the battery system, support braking energy recovery and ensure current output balance in the using process.

The invention relates to the technical field of energy storage type MMC control, and particularly provides a second harmonic generation circulating current suppression method of an energy storage type MMC and a related device, which can calculate a three-phase fundamental frequency current compensation value according to a three-phase energy storage output value of each bridge arm in the energy storage type MMC, and determine a three-phase second harmonic generation circulating current in the energy storage type MMC according to the three-phase fundamental frequency current compensation value. According to the method, the three-phase double-frequency circulating current is taken as a control rate for realizing double-frequency circulating current suppression, the three-phase double-frequency modulation voltage is determined, and the three-phase double-frequency modulation voltage is superposed to the three-phase modulation voltage of the energy storage type MMC. Therefore, the additional three-phase double-frequency modulation voltage can be utilized to offset a double-frequency circulating current excitation source caused by unbalanced energy storage output in the energy storage type MMC, and double-frequency circulating current suppression control of the energy storage type MMC is realized. Therefore, under the condition that the energy storage output of the upper and lower bridge arms of the energy storage type MMC is unbalanced, the second harmonic content of the bridge arm current in the converter can be quickly and effectively reduced, and the bridge arm current stress is reduced.

The application discloses to the technical field of power supply, specifically to a parallel current-sharing redundant power supply system and a control method, first, all parallel power supply modules and loads, environment original operation parameters are collected, and noise reduction filtering and compliance verification are carried out; then, system operation condition is identified, parameter drift is judged, hierarchical load and module health state are judged, harmonic characteristics are extracted, and faults and circulating current are judged; then, current-sharing control strategy is matched, aging drift compensation coefficient is generated, output control parameter is dynamically corrected, load fluctuation is pre-judged, and pre-adjustment parameter is generated; based on this, the application significantly reduces the current-sharing lag and output voltage fluctuation problem caused by load mutation, so that the system always maintains stable current-sharing output in complex dynamic scenes such as frequent start-stop production line and pulse rectifier, and meets the industrial-grade power supply demand of high dynamic response requirement.

The present application relates to the technical field of phase modifier control, in particular to a dynamic reactive power control method and system based on a phase modifier, comprising: acquiring real-time voltage deviation of the phase modifier during operation, and calling corresponding pole phase group rearrangement scheme; calculating magnetic density increment of end structure according to phase advance operation depth of the phase modifier, and activating end magnetic circuit optimization control logic when exceeding temperature rise intervention threshold, adjusting the magnetic circuit by simulating magnetic shielding, setting the material properties of the anti-magnetic steel, and introducing equivalent slot impedance; calculating end potential gradient according to the magnetic density increment, and activating end circuit blocking control logic when exceeding circulating current blocking threshold, blocking the circuit anomaly by inserting equivalent insulation sleeve, short-circuiting positioning rib, and laying equivalent insulation sheet; and coupling the output parameters of the two control logics with the pole phase group rearrangement scheme to generate dynamic reactive power distribution instructions. The method can solve the end temperature rise and circulating current discharge problems during the phase advance operation of the phase modifier, and improve the operation stability.

The invention relates to a diode access and networking method for an unmanned ship stacking unit, and the method comprises the steps: in a primary loop between a three-phase rectification output end of each stacking unit and a DC bus, a positive electrode and a negative electrode are respectively provided with an anti-reverse diode in series; through the positive and negative electrode double-diode structure, the stacking unit can only inject electric energy into the direct-current bus in a one-way mode, automatic cut-off is achieved when the bus voltage is higher than the unit rectification output voltage, and current backflow and circulation between units are prevented. A plug-and-play diode access topology is provided, so that the stacking unit can be realized at any working point of 650V-1000V without an additional control circuit; the stacking unit is extremely simple in access mode, low in cost, stable and high in reliability; the stacking unit injects power to the bus in a one-way mode; bus fault current is prevented from flowing back to the stacking unit; when a plurality of units are connected in parallel, circulation is automatically inhibited; and elastic expansion, flexible deployment, light investment and optimal cost of the system can be realized.

The application relates to a kind of optical fiber passive high-voltage cable circulating current detection system and method, the detection system includes circulating current detection unit, light-emitting control unit, optical fiber module, optical detection unit and circulating current calculation unit;The circulating current detection unit can gather mutual energy of high-voltage circulating current into the capacitor C of light-emitting control unit;After the optical detection unit detects the optical signal, sends pulse signal;The circulating current calculation unit has timing function, can accurately count twice pulse time;The circulating current calculation unit converts time t into current size I using formula I=U*C / t;The circulating current calculation unit supports optical fiber, Ethernet, GPRS transmission data to server;The optical detection unit detects optical signal, and calculates the time of twice light-emitting point pulse through the circulating current calculation unit, calculates the corresponding armored circulating current size.

The application discloses a zero-carbon washing and selecting and water treatment source network load storage integrated microgrid system based on an energy ring, wherein distributed photovoltaic units and substation energy storage units of each workshop are connected to a common direct-current bus through bidirectional DC / DC isolation units to eliminate parallel circulating current from a physical layer; a central shared energy storage regulating unit is arranged and is specially used for bus voltage stabilization and transient power suppression; a direct-current charging and changing facility with a single-pile independent DC / DC architecture is used as a flexible adjustable load unit, and is combined with washing and selecting and water treatment rigid loads to form a virtual battery regulating capacity of a factory area. A three-in-one scheduling control platform of the application is combined with blockchain storage and wind power green electricity certificate verification and cancellation technologies, and realizes four-flow closed-loop cooperation of energy flow, data flow, carbon flow and value flow. The application effectively reduces equipment loss, improves photovoltaic power consumption capacity, meets distributed photovoltaic full self-generation and self-use approval requirements, realizes zero-carbon energy supply of a factory area at all time periods, and simultaneously completes carbon footprint compliance verification and carbon asset value conversion.

The application discloses a kind of for inhibiting loop current's transformer area flexible interconnection system, wherein, first flexible interconnection device and second flexible interconnection device include DC common mode inductance, parallel four-phase bridge arm, first controller and second controller, two DC common mode inductances are connected to the positive and negative poles of four-phase bridge arm respectively and are respectively as positive and negative DC side port, the midpoint of four-phase bridge arm is respectively as four-phase AC side port, the control pole of the first three-phase bridge arm in four-phase bridge arm is respectively connected to first controller, the control pole of the last phase bridge arm is respectively connected to second controller;First, second flexible interconnection device is connected by positive and negative DC side port, and first, second flexible interconnection device is connected by four-phase AC side port four phase lines of the distribution transformer of first, second distribution transformer area. The application can realize transformer area flexible interconnection without isolation, and solve the technical problem that ground loop current is too large when isolation transformer is cancelled.