4039 results about "Alternate current" patented technology

The invention discloses a wind-solar complementary energy storage direct current charging method and system based on liquid cooling heat dissipation, and relates to the technical field of energy storage charging. Comprising the following steps: S1, collecting wind-solar complementary energy storage data in real time, and carrying out data preprocessing; s2, converting wind-solar power generation into direct current, judging the flow direction of wind-solar power generation energy, and performing corresponding wind-solar power generation energy transmission power supply; s3, judging the limit of the output power of the charging pile, and controlling and adjusting the output of the charging pile in stages; s4, quantifying the liquid cooling flow required by heat dissipation, and performing heat source heat dissipation on the energy storage system and the charging pile; and S5, carrying out coordinated regulation and control, strategy optimization and multi-dimensional visualization on the flow direction of wind and light power generation energy, charging pile output and heat source heat dissipation. The problems that an existing charging station is difficult to deploy in remote and power transmission difficult areas, high-power charging heat dissipation and energy efficiency bottlenecks are prominent, and the efficiency of traditional air cooling and alternating current conversion is low, so that efficient, safe and green energy supplementation is difficult to achieve are solved.

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 voltage acquisition circuit, an alternating current power supply, a voltage acquisition method, a voltage acquisition device and a medium. A far-end sampling unit; the in-phase input end of the first comparison unit is connected with the near-end sampling unit, and the inverted input end is grounded; the in-phase input end of the second comparison unit is connected with the far-end sampling unit, and the inverted input end is grounded; the input end of the XOR unit is connected with the output ends of the first comparison unit and the second comparison unit; the in-phase input end of the third comparison unit is connected with the output end of the XOR unit, the inverted input end inputs reference voltage, and the reference voltage is smaller than half of the power supply voltage; the control unit is used for judging that far-end sensing sampling is abnormal when the difference effective value of the voltages output by the near-end sampling unit and the far-end sampling unit is smaller than the preset compensation voltage and the abnormal comparison voltage output by the third comparison unit is 1. According to the invention, when the AC power supply outputs low voltage, the conditions of disconnection and reverse connection of the far-end induction sampling can be identified.

An electric vehicle charging system comprising a Direct Current (DC) distributor, a site controller, one or more alternating current (AC) / DC rectifiers connected to the DC distributor and the site controller, and an electric vehicle charger having one or more DC / DC converters connected to the DC distributor and a charge controller in communication with the site controller and each of the one or more DC / DC converters. The one or more AC / DC rectifiers are decoupled from the one or more DC / DC converters.

The invention relates to the technical field of concrete detection, in particular to a concrete protective layer void detection method and system based on a detachable piezoelectric ceramic sensor and an electromechanical impedance resonance technology. The detection method comprises the following steps: temporarily fixing a detachable piezoelectric ceramic sensor on a detection point on the surface of a concrete structure; applying an alternating-current sweep-frequency voltage to excite the piezoelectric ceramic sensor, and obtaining an electromechanical impedance signal frequency spectrum; the electromechanical impedance signal frequency spectrum is analyzed, the frequency of a local defect formant is obtained, and according to the frequency of the local defect formant, geometric parameters of a void area are estimated through a defect size and frequency relation model; and moving the sensor and repeatedly detecting other detection points. The detection method has high efficiency and flexibility, and detection can be realized in any environment; the single-point detection speed is high, the efficiency is high, baseline data is not needed for detection, the anti-interference performance is high, and rapid positioning and quantitative evaluation of void damage can be achieved.

The invention provides a dynamic impedance matching charger based on battery aging, a method, electronic equipment and a medium. The charger comprises a master control unit, and a battery state monitoring module, an aging grade evaluation module, a dynamic charging control module, a battery cell balancing module, an optimization control module and an anti-interference module which are connected with the master control unit to cooperatively realize charging closed-loop control. The battery state monitoring module injects a preset frequency alternating current signal and outputs an impedance parameter, a charge state and a temperature parameter; the aging grade evaluation module outputs a battery aging grade in combination with a preset model; the dynamic charging control module is matched with an adaptive charging mode instruction; the battery cell balancing module calculates the battery cell impedance difference, and balancing operation is executed if the battery cell impedance difference reaches the standard; the optimization control module generates an optimized current instruction through a preset algorithm according to the related parameters, and superposes the optimized current instruction to the reference current; the anti-interference module improves the signal-to-noise ratio of collected signals to a preset standard through isolation and shielding design.

The invention relates to the technical field of concrete bubble monitoring, in particular to an aluminum film system concrete bubble dynamic monitoring and regulating method which comprises the following steps: applying a high-frequency alternating current with a first preset parameter to an aluminum film system to induce eddy current in an aluminum film and enable the aluminum film to generate thermally induced acoustic vibration; meanwhile, an eddy current thermally induced acoustic response signal reflected by an internal interface of the concrete is obtained; based on the response signal, determining current bubble state information in the concrete, including amplitude attenuation characteristics based on the sound pressure signal, frequency spectrum characteristics based on the sound pressure signal and phase delay information; and based on the bubble state information, a regulation and control instruction of a second preset parameter is generated, the regulation and control instruction is executed to adjust the parameter of the high-frequency alternating current applied to the aluminum film system, and directional traction regulation and control are conducted on the bubbles in the concrete. According to the invention, by means of an eddy current thermally induced sound technology, dynamic distribution, including the number, the particle size, the motion trail and the like, of bubbles is captured in real time, and instantaneous changes in the pouring process can be accurately reflected.

The invention discloses an energy storage battery temperature control method and system based on a liquid cooling unit, and belongs to the technical field of energy storage batteries. The method comprises the following steps: step 102, after the energy storage battery is powered on, starting a self-circulation mode of the liquid cooling unit, and monitoring the highest temperature and the lowest temperature of the energy storage battery in real time; step 104, closing the self-circulation mode of the liquid cooling unit when the self-circulation mode of the liquid cooling unit starts the set average temperature time or the difference value between the highest temperature and the lowest temperature of the energy storage battery is smaller than the set average temperature difference value; 106, on the basis of the total alternating current active power of the energy storage battery, the working mode of the energy storage battery is obtained, and the working mode comprises an operation mode and a standby mode; and step 108, controlling the working mode of the liquid cooling unit based on the working mode of the energy storage battery and the highest temperature and the lowest temperature of the energy storage battery. The method is simpler in judgment condition and higher in universality.

The invention discloses a global cooperative control method and system for unbalanced fault ride-through of a multi-terminal DC power grid, and the method comprises the steps: constructing a fault detection model based on the positive sequence voltage drop depth and the negative sequence voltage size of the AC side of each converter station, automatically judging an unbalanced fault, and carrying out the fault detection when the fault is detected. Calculating the maximum allowable active current based on a fault station unbalanced current control model to carry out current limiting control on the converter station; and carrying out output power adjustment on the DC voltage deviation of the non-fault station based on the non-fault station power cooperation model. Asymmetric fault ride-through is carried out by using a constrained and optimized current instruction generation algorithm, and the capacity of a converter is dynamically and accurately distributed and utilized in a limited manner, so that the voltage support capability of a fault alternating-current power grid is maximized, and globally optimized adaptive power distribution is realized; the power of the non-fault station is calculated and distributed in a centralized manner and is dynamically adjusted according to the real-time available capacity, so that the self-adaption and global optimization of the running state change of the power grid are realized, and the fault handling toughness and reliability of the power grid are improved.

An inertia cooperative control method of an integrated optical storage alternating current and direct current hybrid micro-grid comprises the steps that firstly, according to static and dynamic power capacities of energy storage units in direct current sub-grids and allowed direct current voltage deviation, sub-grid equivalent virtual resistance and virtual capacitance are calculated; secondly, RC + R type parallel virtual impedance parameters are distributed according to the power proportion of each energy storage unit, and multi-energy-storage cooperative response power disturbance according to the capacity is achieved; then, a phase angle is generated based on the mapping relation between direct-current side voltage and frequency, an alternating-current voltage amplitude instruction is determined in combination with reactive power droop control and feeder impedance voltage drop compensation, and a dq-axis voltage instruction is generated through virtual impedance compensation; normalized three-phase modulation waves are obtained through voltage-current double closed-loop control and dq / abc coordinate transformation, and six paths of PWM signals are generated to drive an interconnection converter after the normalized three-phase modulation waves are compared with triangular carrier waves. The method does not need to depend on external communication, has the capabilities of autonomous inertia support, voltage and frequency coordinated regulation and reasonable multi-source power distribution, and improves the stability and dynamic response performance of the system under island operation.

The invention discloses a low-harmonic high-voltage speed regulation system based on a multi-pulse phase-shifting transformer, and particularly relates to the field of power electronic technology and motor speed regulation, which is characterized in that the primary side of the multi-pulse phase-shifting transformer is in star connection, and N groups of windings on the secondary side are in extended delta connection, so that phase difference is realized; the multi-path low-voltage alternating current is converted into multi-path low-voltage alternating current and low-order harmonics are High voltage is output through cascade H-bridge topology series connection, and reliable conversion is guaranteed through rectification filtering inversion and device redundancy design; the motor control module collects signals through multiple sensors, and PWM drive signals are generated through a vector control algorithm and coordinate transformation. The harmonic detection and compensation module detects harmonic waves based on an FFT algorithm, and injects a reverse compensation component through a modulation strategy to offset the harmonic waves; and the auxiliary protection module integrally realizes low-harmonic and high-precision high-voltage motor speed regulation through multi-dimensional monitoring and hardware protection.

The invention discloses a voltage-to-current circuit, a calibration method, a multi-range calibration method and a power supply, a power amplification unit adopts MOS tubes of different channel types to match with working voltages of opposite polarities, and a bias circuit is combined to superpose exclusive bias, so that the waveform adaptation limitation of a traditional circuit is broken through, and the voltage-to-current conversion efficiency is improved. Alternating current, direct current, triangular waves, square waves and other special waveforms can be stably output, and the adaptability is greatly improved; secondly, pure hardware signal transmission and feedback are carried out in the whole process, the intermediate link of MCU measurement-setting is omitted, multi-stage error accumulation is effectively reduced, output delay is remarkably reduced, and the response speed is higher; in addition, the current sampling feedback unit and the error amplification unit form closed-loop control, power amplification output current is sampled in real time and fed back for calibration, and the precision and stability of the output current are effectively improved. Meanwhile, the bias circuit accurately regulates and controls the conduction state of the MOS tube, the linearity and consistency of current output are improved, and the overall structure is simple and reliable.

The invention provides an MRAM alternating current parameter testing method and system, a medium and a product, and relates to the technical field of chip testing, and the method comprises the steps: configuring a calibration delay value based on a pre-measured error delay value, and carrying out the compensation of the inherent signal transmission deflection of the system. On the basis, by performing stepping adjustment on the configured delay value and utilizing the delay control pin of the main control chip to accurately configure the delay amount of the plurality of delay chips, the system can explore the function boundary of the MRAM chip to be tested in nanosecond or even higher precision. And finally, recording the configuration delay value when the read data does not accord with the preset data. According to the scheme, the technical problem of how to test the alternating current parameters of the MRAM at low cost and high precision in the prior art is solved.

The utility model discloses a soft start system based on excitation current reduction, which is characterized in that a time relay mainly controls the switching of a live wire between a power resistor and an alternating current contactor, the power resistor magnetizes a transformer at the moment of electrification, and the alternating current contactor is connected into a circuit by the time relay after the magnetization is completed; and after the power resistor is short-circuited, the circuit is cut out, so that the purpose of suppressing the excitation inrush current is finally achieved, the excitation effect caused by voltage abrupt change at the power-on moment of the isolation transformer can be avoided, and the excitation abrupt change of the isolation transformer during power-on is effectively reduced.

The invention discloses an energy storage system and a control method thereof, and the energy storage system comprises a battery energy storage unit which comprises a battery pack and a power conversion module connected with the battery pack, and the power conversion module is used for inverting the direct current of the battery pack into the alternating current and outputting the alternating current to a power grid; the control unit is used for controlling the battery energy storage unit to enter a networking mode when the charge state of the battery pack is within a preset range and the temperature meets a set condition, and in the networking mode, the maximum power value provided by the battery pack is a first power value. According to the invention, through the limitation of the entering condition before the battery energy storage unit enters the network construction mode, the judgment of the performance of the battery pack entering the network construction mode is realized, and the safety of the network construction process and the sustainability of steady-state operation are ensured.

The invention discloses an alternating current asynchronous motor fault diagnosis method and device and a storage medium thereof, and relates to the technical field of artificial intelligence, and the method comprises the steps: employing a non-intrusive installation mode, arranging a multi-source sensor outside an alternating current asynchronous motor, and collecting the multi-source monitoring data in the operation process of the motor; preprocessing the multi-source monitoring data; based on the electrical and mechanical coupling mechanism of the AC asynchronous motor, constructing a mechanism model reflecting the internal relation between different parameters and the electrical system state of the motor in normal operation and typical fault states; performing fusion processing on the preprocessed multi-source monitoring data by using an information fusion algorithm to obtain a fused sensing data set; a machine learning algorithm is adopted to carry out optimization parameter adjustment on the mechanism model based on the fusion sensing data set, a motor fault diagnosis model is obtained, and the motor fault diagnosis model outputs a motor fault diagnosis result based on multi-source monitoring data obtained in real time; the method has the effect of improving the fault monitoring efficiency of the alternating current asynchronous motor.

Embodiments of the disclosure provide a solution for video processing. A method for video processing is proposed. The method includes: obtaining, for a conversion between a target frame of a point cloud sequence and a bitstream of the point cloud sequence, a predicted value of the target frame by performing at least one of: alternating current (AC) prediction or direct current (DC) prediction in a domain; and performing the conversion based on the predicted value.

The invention discloses a half-bridge three-phase single-stage AC / DC converter and a control method thereof, and belongs to the technical field of electric energy conversion. The half-bridge three-phase single-stage AC / DC converter comprises an AC side switch module, a resonance module, a DC side switch module and a filtering module; a three-phase alternating current, the filtering module, the alternating current side switch module, the resonance module, the direct current side switch module and a direct current are connected in sequence. According to the half-bridge three-phase single-stage AC / DC converter and the control method thereof, bidirectional conversion of energy can be realized, the energy conversion level is reduced, and the overall efficiency and the power density of the converter are improved.

The invention relates to a new energy automobile operation safety detection system, a detection method and a prediction method, relates to the technical field of new energy automobile detection, and solves the technical problems that in the prior art, new energy automobile operation safety detection equipment is complex in structure and low in detection precision and does not have an early warning system for operation safety. The detection system comprises an industrial personal computer, a license plate recognition module, an OBD reading module, a resistance measurement module, a CAN reading module, a direct current charging module, a control switch, a host, a cloud server and a direct current charging gun. Through arrangement of the resistance detection module and the direct current charging gun, the alternating current charging port detection end and the potential equalization detection end which are directly connected with the resistance detection module, the structure of the new energy automobile operation safety detection equipment is simplified, and the detection precision of insulation resistance and potential equalization is also improved.

The invention relates to the technical field of alternating-current and direct-current power distribution networks, in particular to an alternating-current and direct-current power distribution network SOP partition interconnection locating and sizing method and a related device, and the method comprises the steps: obtaining GIS multi-source data and power distribution network data of a target region; dividing a power supply area according to the GIS multi-source data and the power distribution network data to obtain a to-be-interconnected partition pair set; generating a high-quality interconnected partition pair set by using the to-be-interconnected partition pair set; constructing a target optimization model by taking the minimum total operation cost as an optimization target and taking a power balance constraint, a node voltage constraint, a branch capacity constraint, an SOP operation constraint, an SOP reactive power constraint and an SOP capacity constraint as constraint conditions; and inputting the high-quality interconnection partition pair set into the target optimization model, cooperatively solving the target optimization model by adopting a double-layer optimization algorithm to obtain the optimal position and the optimal capacity of the SOP, and solving the technical problem that the existing SOP locating and sizing method is difficult to meet the targets of engineering feasibility and optimal operation benefit at the same time.

The invention provides a PWM / Buck cascade circuit auxiliary electrolytic hydrogen production rectification power supply and a control method, and relates to the technical field of electrolytic hydrogen production power supply and intelligent power grids, and the power supply comprises a main power loop and an auxiliary power loop; the main power loop comprises a multi-pulse thyristor rectifier, the power supply side of the multi-pulse thyristor rectifier is connected with an alternating-current power grid, the load side of the multi-pulse thyristor rectifier is connected with one end of a direct-current smoothing reactor, and the other end of the direct-current smoothing reactor is connected with the electrolytic bath; the auxiliary power loop comprises a PWM rectifier and a Buck circuit which are connected in series, the output end of the Buck circuit is connected to the output end of the main power loop in parallel through a direct-current LC filter, the output end of the Buck circuit and the output end of the main power loop are jointly connected into an electrolytic bath for ripple compensation, the multi-pulse rectifier adopts PI control, the PWM rectifier adopts voltage and current double-closed-loop control and SVPWM modulation, Buck adopts PI and feedforward compound control, and the output end of the Buck circuit and the output end of the main power loop are connected in parallel. The system has the advantages of improving the grid-side electric energy quality, the voltage utilization rate, the water electrolysis hydrogen production efficiency and the operation stability.

The invention relates to the technical field of charge and discharge detection, and discloses a multichannel EIS charge and discharge in-situ test system and method, and the system comprises a DC charge and discharge module which is used for carrying out the constant-current, constant-voltage or cyclic charge and discharge test of a battery; the alternating current impedance test module is connected in parallel with the direct current charging and discharging module and is used for applying an alternating current disturbance signal to the battery and collecting impedance response in the charging and discharging process; and the unified clock module is used for providing a synchronous triggering reference signal for the direct current charging and discharging module and the alternating current impedance test module. The direct current charging and discharging module and the alternating current impedance test module are designed to be of a parallel connection normally-connected structure, no relay switching is needed, continuous and uninterrupted online EIS test in the charging and discharging process is achieved, contact resistance drift and transient errors caused by physical circuit switching in a traditional scheme are effectively avoided, and the reliability of the EIS test is improved. And the stability and repeatability of the test are obviously improved.

The invention discloses a power regulation and control method and device for a multi-terminal flexible direct current system, and the method comprises the steps: traversing the current line power flow of each line in the multi-terminal flexible direct current system, and determining an overload channel line set and a normal channel line set; sorting the overload channel lines according to the overload rate of each line in the overload channel line set, and determining a target overload line; in combination with the normal channel line set, analyzing the sensitivity of the target overload line to each adjustable variable, giving out the comprehensive sensitivity corresponding to each adjustable variable, and determining a target adjustment variable and an adjustment value of the target adjustment variable from the adjustable variables; and based on the adjustment value of the target adjustment variable, regulating and controlling the multi-terminal flexible direct current system and updating the overload channel line set, and regulating and controlling the multi-terminal flexible direct current system and updating the overload channel line set in real time, so that the multi-terminal flexible direct current system achieves the effect that the direct current line is not overloaded while frequently adjusting the power of the converter station to optimize the alternating current power flow.

The invention relates to a DC power transmission system oscillation suppression method based on a matrix passivity theory. The method comprises the following steps: firstly, establishing a converter admittance matrix under a frequency coupling effect; then, constructing a stability criterion of the direct-current power transmission system based on the admittance matrix of the converter in combination with a matrix passivity theory; and finally, based on the stability criterion of the direct-current power transmission system, adding active damping and passive damping, adjusting corresponding parameters, and suppressing medium-high frequency oscillation of the direct-current power transmission system. The method can solve the problem of dependence on power grid side impedance modeling, constructs the stability criterion of the DC power transmission system by directly analyzing the admittance matrix characteristics of the converter, adapts to the complex situation when the AC grid side operation condition changes, and can completely suppress the medium-high frequency oscillation of the DC power transmission system. An unstable interval of a direct current system is transferred to a high frequency band through active damping, strict stability of the direct current power transmission system in middle and high frequency bands is achieved through passive damping, and the strategy cost is reduced.

The utility model discloses a field inversion configuration power supply and system of a distributed rectifying device. The field inversion configuration power supply comprises an alternating current source, N resonance branches and an angular pinch coil, each resonance branch is provided with a distributed rectification circuit and a capacitor; the distributed rectifying circuit comprises a plurality of rectifiers which are connected in parallel; one end of the distributed rectifying circuit is connected with an alternating current source, and the other end of the distributed rectifying circuit is electrically connected to the angular pinch coil after being connected with the capacitor; according to the scheme, structural improvement is carried out on the basis of a traditional field inversion power supply technology, and a distributed rectification circuit comprising a plurality of rectifiers connected in parallel is arranged on each resonance branch; by adjusting the working time limit of each independent rectifier in the distributed rectifier circuit, the theta-pinch field inversion device can meet the complex frequency working requirement.

The present disclosure describes systems for providing electrical power that are modular, upgradable, and customizable. Systems described herein can be used to create modular, upgradable, and customizable charging stations for charging electric vehicles. In one example, a sub panel module can be electrically connected to a main input line that provides an alternating current power supply, and includes a plurality of electrical outlets, and a plurality of breaker switches Each breaker switch is electrically connected to one or more of the plurality of electrical outlets and can be electrically connected to the main input line.

The invention relates to the technical field of hybrid energy storage systems, and particularly discloses a net-forming type flywheel and electrochemistry hybrid energy storage system and a cooperative control method thereof. The net-forming type flywheel and electrochemical hybrid energy storage system comprises an alternating current bus, a direct current bus, a brake unit, a first energy storage converter, a plurality of second energy storage converters, a plurality of flywheel energy storage units, a plurality of electrochemical energy storage units and a controller. The first energy storage converter is used for constructing an independently operated alternating current power grid in a network construction operation mode; the controller is used for carrying out power distribution on the flywheel energy storage units and the electrochemical energy storage units based on the instantaneous frequency change rate, so that power support is provided for the first energy storage converter through the direct-current bus, and the stability of the alternating-current power grid is maintained. According to the invention, the dynamic supporting capability and the operation reliability of the net-forming type flywheel and electrochemical hybrid energy storage system can be comprehensively improved.

A system for tuning the resistance of a Josephson Junction, the system comprising a source of tuning voltage and a measurement unit, the source being configured to apply the tuning voltage which is an alternating voltage across the Josephson Junction to allow the Josephson Junction to reach a target resistance, the measurement unit being configured to measure the resistance of the Josephson Junction using the tuning voltage.

The invention provides a mine complex environment methane monitoring instrument reliability evaluation method and system, belongs to the field of instrument detection, and solves the problems that an existing experiment mode breaks away from the complex environment of a real mine, evaluation standards are statically solidified, and the existing experiment mode is difficult to dynamically adapt to mine environment parameter space-time fluctuation characteristics. And accurate reliability evaluation cannot be provided for the mine complex environment methane monitoring instrument. The method comprises the following steps: carrying out alternating current thermal modulation on the catalytic methane sensing element, and constructing harmonic response mapping of a thermal driving signal and an output signal of the sensing element; performing phase-locked demodulation on the harmonic response under the condition of clean reference gas to obtain at least a second harmonic amplitude and a third harmonic amplitude to calculate a poisoning index; and continuously collecting a change curve of the poisoning index along with time under a set hydrogen sulfide exposure and cleaning recovery cycle working condition, and generating a poisoning index drift rate and an advance index so as to determine a gas interference item reliability evaluation conclusion of the monitoring instrument.

The invention belongs to the technical field of power supply and distribution of a data center, and provides an electrical protection method and system for power supply and distribution of the data center, aiming at the data center of a 2N power distribution architecture, electric energy parameters of two paths of external mains supply are collected and transmitted to an EMS of an energy storage system, and system charging and discharging power is controlled and adjusted through the EMS. According to the fact that the sum of the power on the two alternating current buses is larger than a set protection threshold value, the first switch device is controlled to cut off the connection between the energy storage system and the second alternating current bus, overload of a superior line or a transformer during charging or power supply switching is prevented, and in addition, through the measures of a reverse power detection device, first-path voltage loss linkage and the like, the energy storage system can be effectively protected. An external electrical protection system independent of the energy storage system is added to form dual protection, so that a dual fault superposition scene of energy storage system faults or power grid faults is effectively isolated, and the reliability of an originally designed power supply network of the data center is guaranteed.