229results about How to "Reduce power loss" patented technology

The invention discloses an emergency power supply quick access method based on scene recognition, which relates to the technical field of emergency power supplies, and comprises the following steps: in an emergency power supply system, firstly obtaining electrical input parameter information through a preset detection frequency; by introducing a load change evaluation mechanism based on machine learning, the system can identify load fluctuation in real time and dynamically adjust the detection frequency, and the response speed to the rapid change of the load is improved. Compared with a traditional detection method, the load state is intelligently evaluated and accurately divided, it is ensured that the power factor is adjusted in time when the load fluctuates violently, and power loss and waste are reduced. Correction is carried out according to the traditional frequency during stable load fluctuation, the frequency is dynamically adjusted during rapid fluctuation, the electric energy use is optimized, the electric power quality is improved, and harmonic distortion and overload risks are reduced.

The invention relates to the technical field of emergency mobile power supplies, and discloses a control method of an emergency mobile power supply and the emergency mobile power supply, and the method comprises the steps: carrying out the operation parameter data collection and adaptive wavelet transform noise reduction of the emergency mobile power supply, and obtaining a standardized feature matrix; performing hierarchical feature extraction through an extended convolutional capsule network to obtain global power supply features and local power supply features; establishing a deep deterministic strategy network for power supply state scoring to obtain a state scoring result; inputting historical data in the experience playback pool into an action generation module, performing optimization iteration on the control action to obtain a first control strategy, and recording state transition data in a control process; and carrying out power loss compensation control analysis to obtain compensation control quantity, superposing the compensation control quantity to obtain a second control strategy, carrying out PWM (Pulse Width Modulation), and generating a charging and discharging control signal. According to the invention, accurate power regulation and energy storage unit control are realized, and stable operation of the system is ensured.

The invention discloses a multistage safety response control method of an industrial and commercial liquid cooling energy storage system, and relates to the technical field of electric energy storage systems, a sensor network collects an operation state data time sequence matrix, and abnormal data cleaning is carried out on the time sequence matrix; the method comprises the following steps: preprocessing a vibration signal of a cooling system, extracting characteristic data of abnormal vibration through Fourier transform and energy distribution analysis, and positioning a time-frequency distribution abnormal region; generating a time sequence multivariable data set according to the characteristic data of the abnormal vibration, determining a cause label according to the fused time sequence multivariable data set, obtaining the inherent frequency and the resonant frequency of the cooling system in combination with simulation analysis, and matching and determining the cause of the abnormal vibration; an LSTW neural network is used for predicting the abnormal resonance risk, and corresponding countermeasures are taken for the cooling network according to the prediction result; unnecessary vibration caused by error adjustment is avoided, the relation between cooling efficiency and safety is balanced, and unnecessary power loss is reduced.

The invention discloses a twisting clamping refrigerating and heating device with cold and hot end separation and work recovery functions. The twisting clamping refrigerating and heating device comprises a stator module, a rotor module and a heat exchange module. The stator module comprises an inner gear and an outer gear, and teeth are arranged on partial edges of the inner gear and the outer gear. The rotor module comprises a torsion clamping refrigerant and a loading gear; the heat exchange module comprises an inner cylinder and an outer cylinder. And the loading gear revolves to drive the torsion clamping refrigerant to change the heat exchange position, and rotates to drive the torsion clamping refrigerant to be loaded and unloaded. When the loading gear is meshed with the inner gear, the loading gear rotates in the forward direction, and the torsion clamping refrigerant generates heat due to loading; when the loading gear is meshed with the outer gear, the loading gear rotates reversely, and the torsion clamping refrigerant absorbs heat due to unloading. According to the device, a heat exchange area is effectively separated, the problem of mutual interference of cold and heat is avoided, and the heat exchange efficiency and power are greatly improved; the resilience force generated when the torsion clamping refrigerant is unloaded is transmitted to the loading area, auxiliary power is provided for the loading process, recycling of work is achieved, and the energy utilization efficiency is improved.

The invention provides a photovoltaic array optimization generation method and device, electronic equipment and a storage medium, and the method comprises the steps: calculating a target inclination angle of a photovoltaic module unit in a target photovoltaic power station based on meteorological data and factory site geographic data of the target photovoltaic power station; obtaining an inverter type of a target photovoltaic power station, and determining a target number of photovoltaic module units connected with each inverter according to the inverter type; according to the factory site geographic data, calculating a target distance between the photovoltaic module units; and inputting the target inclination angle, the target number and the target spacing into an array optimization model for array optimization, and generating an optimized array of the target photovoltaic power station. Compared with the prior art, according to the embodiment of the invention, illumination absorption is maximized through the target inclination angle obtained through calculation, so that the power generation efficiency is improved; and the target inclination angle, the assembly number and the spacing are input into the array optimization model, so that a scientific basis can be brought to the design of the photovoltaic power station, and the overall performance and economic benefits of the system are further improved.

A solar cell includes a cell substrate, a plurality of collector electrodes, a plurality of bus electrode segments, and a plurality of columns of interconnects. The battery substrate has a target surface. The current collection electrodes are arranged on the target surface, extend in the first direction and are distributed at intervals in the second direction intersecting with the first direction. The bus electrode section is located on the target surface and extends in the second direction. And each row of interconnection parts extend along a second direction, and the interconnection parts are arranged on the current collection electrodes. The bus electrode section extends in the second direction and is located in the upper end edge area and / or the lower end edge area of the target surface. On the target surface, the number of the bus electrode sections is smaller than two times of the column number of the interconnection parts, and / or the length of at least one bus electrode section is smaller than or equal to 5.3 mm, and / or the weighted average width of at least one bus electrode section is smaller than or equal to 0.29 mm. And by reducing the number of the bus electrode sections, the current collection electrode can collect current carriers to the maximum extent, and the conversion efficiency of the battery is improved. The utility model also provides a photovoltaic module comprising the solar cell.

The embodiment of the invention relates to the field of photovoltaic technology, and provides a back contact photovoltaic module, which at least can improve the efficiency of the back contact photovoltaic module. The back contact photovoltaic module comprises a battery body and an insulating part, a first surface of the battery body is provided with a plurality of main grids and a plurality of fine grids, and the plurality of fine grids comprise first fine grids and second fine grids which extend along a first direction and are alternately distributed along a second direction; the plurality of main grids comprise first main grids and second main grids which extend along the second direction and are alternately distributed along the first direction, and each main grid comprises a main grid body and a welding part which are alternately connected; the insulating parts are located on the first surface and at least cover the ends, close to the second main grids, of the first fine grids and the ends, close to the first main grids, of the second fine grids, and the insulating parts located on the two sides of the main grid body in the first direction and closest to the welding parts are first insulating parts. The rest of the insulating parts located on the two sides of the main grid body in the first direction are second insulating parts, and the distance between the first insulating parts is smaller than the distance between the second insulating parts in the second direction.

The invention relates to a distributed photovoltaic power station main converter and a control method thereof, and belongs to the field of photovoltaic power generation. The main current transformer comprises a T-type three-level current transformer and a Buck-Boost current transformer; the T-type three-level converter comprises three bridge arms, two output capacitors and the like; each bridge arm is provided with four power switch tubes; the two output capacitors are connected in series, and the connection point is called as the midpoint O of the T-type three-level converter. And one end of a direct-current inductor of the Buck-Boost converter is connected with the midpoint O. The T-type three-level converter adopts PI control and a carrier pulse width modulation strategy to realize alternating current side current harmonic wave minimization of the T-type three-level converter; the Buck-Boost converter adopts a PI control method to realize neutral-point potential automatic balance control. The method is small in current harmonic wave, low in cost and simple to control, and can realize quick and automatic balance of the neutral-point potential, thereby effectively coping with the influence of illumination and power grid voltage fluctuation on system control, and realizing quick and stable control of the distributed photovoltaic power station.

The invention discloses a photovoltaic array fault detection method based on IV characteristics and a data model, and relates to the technical field of fault detection.The method comprises the steps that firstly, the collection frequency Cp is determined by comprehensively considering the dynamic characteristics, historical faults and the occurrence speed, it is ensured that key fault information is not missed, and then by means of second derivative analysis and squareness calculation of an IV curve, the fault information is obtained; and a data model is combined to accurately identify a local shadow fault, and the situation that previous fault judgment depends on a single index is changed. In the aspect of energy conversion efficiency optimization, a local maximum power point is determined according to a judgment factor Pz and an IV curve, photovoltaic array output and inverter input are dynamically matched, and compared with a traditional fixed matching mode, the power generation efficiency is further improved, and energy waste is reduced. By starting a model verification mechanism, the accuracy and stability of the model can be verified in different scenes and time spans.

The invention provides a power adapter control method and a power adapter, and relates to the technical field of power supplies. The method comprises the following steps: acquiring a bus voltage real-time value of the power adapter; matching the bus voltage real-time value with the N control voltage intervals V1 to VN to obtain a real-time control voltage interval matched with the bus voltage real-time value; wherein N is greater than or equal to 2, the N control voltage intervals are continuous and progressively increased from V1 to VN, and the N control voltage intervals V1 to VN correspond to N different output power control values P1 to PN; and adjusting an output power instruction value of the power adapter to an output power control value corresponding to the real-time control voltage interval according to the real-time control voltage interval. According to the invention, the output power of the power adapter can be regulated in real time to match the real-time value of the bus voltage, and the resource utilization rate of the power adapter is improved.

The invention relates to the technical field of wind-solar power generation, and discloses a wind-solar complementary power generation device with a storable photovoltaic panel, which comprises a mounting seat, a tower is mounted on one side of the outer wall of the mounting seat, the photovoltaic panel is mounted on one side of the outer wall of the tower, the photovoltaic panel is connected with the tower through a folding and unfolding mechanism, a fixed shaft is mounted at one end of the tower, and the fixed shaft is connected with the mounting seat. And blades are arranged on one side of the outer wall of the fixed shaft. The folding and unfolding mechanism comprises a fixing frame, the fixing frame is installed on one side of the outer wall of the tower, fixing frames are installed on one side of the outer wall of the fixing frame, and first rotating shafts are installed on one sides of the outer walls of the two fixing frames. Through the folding and unfolding mechanism, the angle can be dynamically adjusted according to the sun position, it is ensured that the sun is perpendicular to light as many time periods as possible all day long, illumination is received to the maximum, and the photoelectric conversion efficiency is improved; and on the other hand, blades of the wind power generation part are matched with the adjusting assembly, and the pitch angle can be accurately adjusted no matter how the wind speed and the wind direction change.

The embodiment of the invention discloses a control method and device and a vehicle. The method comprises the following steps: when a vehicle is in a power-off state, a vehicle controller judges whether each network wake-up variable is in a valid state, records a corresponding wake-up parameter for the network wake-up variable in the valid state, and if the wake-up parameter of the network wake-up variable in the valid state is greater than or equal to a corresponding threshold value, the vehicle is powered off; and if yes, setting the network wakeup variable in the valid state as an invalid state. Through the above mode, when the wake-up parameter of the network wake-up variable in the effective state is greater than or equal to the corresponding threshold value, it may be indicated that the vehicle owner / pedestrian has abnormal operation, the vehicle controller has a fault, and so on. Therefore, the vehicle controller does not respond to the network wake-up variable in the effective state any more, the number of times that the vehicle controller is awakened abnormally can be reduced, the electric quantity loss of the vehicle in the power-off state is reduced, and the power lack prevention capacity of the vehicle is improved.

The invention discloses a charging control method, system and device of a battery swap station and a medium. The charging control method of the battery swap station comprises the following steps: controlling the high-power module to charge the power battery; according to the charging state of the power battery, judging whether the charging demand of the power battery is reduced to a preset index or not; and when the charging demand of the power battery is reduced to the preset index, switching to the low-power module to charge the power battery until a charging exit condition is met. By adopting the embodiment of the invention, the power battery can be connected with and charged with different power modules without additionally developing a power distribution unit, so that the power loss of the power modules is effectively reduced, and compared with the prior art, the power module has the advantage of low cost.

The invention provides a self-adjusting air cooling structure of a motor rotor. The self-adjusting air cooling structure comprises a rotating shaft, a rotor bracket, a rotor iron core, a permanent magnet and a permanent magnet sheath which are sequentially sleeved and fixed from inside to outside, the interior of the rotor support is of a hollow structure, and the rotor support comprises an air cooling adjusting part, a flow guide structure, a flow blocking ring and a supporting structure. At least one air cooling adjusting component which is uniformly distributed in the circumferential direction is arranged on the inner side of the outer ring of the rotor bracket, and each air cooling adjusting component comprises at least one radiating fin and a self-adjusting structure; the self-adjusting structure can automatically adjust the inclination angle of the heat dissipation fins according to the temperature and the rotating speed of the rotor, and then the air flow is controlled. The operation efficiency and the heat dissipation efficiency of the motor are remarkably improved, and the overall performance and the reliability of the motor are improved.

The invention relates to the technical field of power system network topology optimization, in particular to an offshore wind plant current collection system topology optimization method and system oriented to global optimum, and the method comprises the steps: collecting coordinate position data of all wind driven generators; carrying out site selection on the offshore transformer substation through a fuzzy C-means algorithm; connecting all candidate cables based on the coordinate position data of the wind driven generator; a topological optimization problem of a current collection system of an offshore wind plant is formulated based on an MILP model of power network extension planning, an optimized objective function is established, constraint conditions are set, and the objective function aims at minimizing the total cost of current collection system planning of the offshore wind plant; and optimizing and solving the MILP model to obtain an optimal topology design scheme. According to the method, various physical and economic constraints in the offshore wind power plant current collection system are simulated based on the MILP optimization model, the optimal current collection system layout can be generated, and the power transmission loss can be accurately evaluated.

The invention relates to the photovoltaic field, and provides a photovoltaic module, which at least can improve the performance of the photovoltaic module and save the preparation cost. The photovoltaic module comprises a plurality of battery pieces and a welding strip, wherein the plurality of battery pieces comprise a first battery piece and a second battery piece which are adjacent to each other; the welding strip is located on the first battery piece and the second battery piece and electrically connected with the first battery piece and the second battery piece, the welding strip comprises a conductive part, and the cross section area of the conductive part located on the second battery piece is larger than that of the conductive part located on the first battery piece.

The invention discloses a vehicle-mounted terminal control method and device, equipment and a medium. The method comprises the steps that a vehicle-mounted terminal of a vehicle receives a reservation upgrading request which is input by a user and contains a target reservation moment; the vehicle-mounted terminal responds to the upgrade reservation request to be switched to an awakening state; the vehicle-mounted terminal responds to the first awakening keeping request to keep awakening for a first duration, and the air upgrading module judges whether the vehicle meets a preset upgrading condition or not within the first duration; under the condition that the vehicle meets the preset upgrading condition, the air upgrading module sends a second awakening keeping request for keeping awakening for a second duration to the vehicle-mounted terminal; and the vehicle-mounted terminal responds to the second wakeup keeping request to keep wakeup for a second time length, and the air upgrading module uses the upgrading package to carry out upgrading operation within the second time length. According to the method and the device, the probability that the vehicle-mounted terminal is in an awakening state due to OTA upgrading is reduced, and the probability that the battery is lack of electricity due to OTA upgrading is also reduced.

Provided in the present invention are an insulated gate bipolar transistor with a super junction structure, and a preparation method therefor. The transistor comprises a drift region of a first conduction type, an epitaxial layer, a plurality of trenches arranged at intervals, filling layers of a second conduction type, gate electrode structures, a body region, a body contact region, a source region, an isolation dielectric layer and a source electrode conductive layer, wherein the epitaxial layer is located on an upper surface of the drift region; the filling layers and the gate electrode structures are sequentially arranged in the trenches from bottom to top; each gate electrode structure comprises a gate conductive layer, and a gate dielectric layer, which is located on inner walls of the trench and an upper surface of the filling layer and wrap side walls and a bottom face of the gate conductive layer; the body contact region and the source region are located on an upper surface layer of the body region and are adjacent to an upper surface of the body region; the isolation dielectric layer is provided with a contact hole, which penetrates the isolation dielectric layer and exposes the source region and the body contact region; and the source electrode conductive layer fills the contact hole and covers the isolation dielectric layer. In the present invention, the filling layer is formed at the bottom of each trench so as to shield the overlapping area between the bottom of the trench and the drift region, thereby reducing gate electrode charges Qgc.

The utility model provides a monitoring and early warning device for a debris flow gully in a canyon fall section, and relates to the technical field of natural disaster early warning. The device comprises a supporting column, a connecting frame, a sliding rail, a debris flow monitoring module and a rainfall monitoring module. Wherein the supporting columns are embedded and fixed on the two sides of a debris flow gully; the connecting frame is fixedly connected to the upper end of the supporting column. The sliding rail is fixed to the lower end of the middle of the connecting frame and extends in the same direction as the debris flow gully. The debris flow monitoring module is slidably connected to the sliding rail and can follow the debris flow state in the debris flow gully when the debris flow disaster occurs. And the rainfall monitoring module is fixed at the upstream position of the debris flow gully. According to the scheme, the debris flow monitoring module can move along the channel for monitoring through the sliding track, dynamic data collection is achieved in combination with the rainfall monitoring module, the problem that traditional fixed-point monitoring cannot adapt to complex canyon terrains is solved, and the accuracy and timeliness of early warning are improved.

The application discloses a kind of hybrid line DC fault ride-through control method, device and system, belong to flexible HVDC transmission technology.The DC fault ride-through control method of the application, first, the actual DC current corresponding to DC line in flexible HVDC transmission system is monitored, and the actual DC current in abnormal target line is obtained;Then according to the actual DC current corresponding to target line, the DC reference voltage corresponding to target line is adjusted to fault ride-through voltage reference value, to control the DC current corresponding to target line to be set value of fault ride-through;Finally, in the case where the actual DC voltage corresponding to target line satisfies preset recovery condition, the DC reference voltage corresponding to target line is restored to preset reference voltage value.The DC fault ride-through method of the application is fast in response speed, can also reduce the influence on output power, reduce power loss, improve the stability and reliability of flexible HVDC transmission system operation.

The utility model discloses a feeding reciprocating synchronizing device of a flaking machine, and belongs to the technical field of disc type flaking machines. The device mainly comprises a base assembly, the base assembly is movably connected with a long material conveyor and a material pressing device which can move in a reciprocating mode, the material pressing device is fixedly arranged at one end of the long material conveyor, and the conveying direction of the long material conveyor is perpendicular to the moving direction of the long material conveyor and the moving direction of the material pressing device. The base assembly is rotationally connected with a reciprocating transmission mechanism used for driving the material pressing device and the long material conveyor to move synchronously. The reciprocating transmission mechanism comprises at least one transmission shaft, gear mechanisms are fixedly connected to the transmission shafts located at the two ends of the reciprocating transmission mechanism respectively, and rack mechanisms meshed with the gear mechanisms are fixedly connected to the material pressing device and the long material conveyor respectively. Synchronous reciprocating feeding of the long wood conveyor and the material pressing device is achieved, the stability of long wood in the planing process is guaranteed, and the machining precision is improved.

The invention discloses a road sweeper fluted disc meshing transmission front wheel with a nitrogen damping function, and relates to the technical field of vehicle engineering, the road sweeper fluted disc meshing transmission front wheel comprises a front fork weldment, deep groove ball bearings III are mounted on the two sides of the front fork weldment, and crank weldments are connected to the outer sides of the deep groove ball bearings III in a sleeving manner; nitrogen buffer shock-proof modules are installed at the bottom of the front fork weldment and the top of the crank weldment and used for reducing shock of the sweeper in the running process. The nitrogen buffer shock-proof module comprises spring seats installed at the bottom of the front fork weldment and the top of the crank weldment, and a nitrogen shock absorber is installed between the lower set of spring seats and the upper set of spring seats. Through the nitrogen buffering and shock-absorbing module, the problems that the vehicle is difficult to control and the sweeping operation quality is affected due to bumpy road surfaces can be solved, and the continuity and high efficiency of sweeping operation are guaranteed.

The utility model relates to a charging protection circuit, a charging and discharging system and electric equipment, and the circuit comprises an input end which is used for connecting an input power supply and comprises a positive electrode end and a negative electrode end; the output end is used for connecting to-be-charged equipment; the diode module comprises a field effect transistor and a controller, the field effect transistor is connected with the positive electrode end and the output end, and the controller is connected with the field effect transistor and the negative electrode end; and the controller is suitable for controlling the on-off of the field effect transistor according to the voltage of the input end and the output end. The utility model has the effects of reducing the power loss of forward conduction and improving the charging utilization rate of the input power supply.

The utility model discloses a high-efficiency photovoltaic module which comprises a first battery string, a second battery string, a third battery string, a fourth battery string, a fifth battery string, a sixth battery string, a seventh battery string, an eighth battery string, a ninth battery string, a tenth battery string, an eleventh battery string and a twelfth battery string which are formed by welding a plurality of battery pieces together through a plurality of welding strips. A first bus bar is welded to one side of the first battery string, one side of the third battery string, one side of the fifth battery string, one side of the seventh battery string, one side of the ninth battery string and one side of the eleventh battery string, a second bus bar is welded between the first battery string and the seventh battery string, a second bus bar is welded between the sixth battery string and the seventh battery string, and a third bus bar is welded between the second battery string and the eighth battery string. And a bus bar 3 is welded between the battery string 4 and the battery string 10, and the bus bar is overlapped with the battery pieces, so that the area occupied by the bus bar is reduced, and the conversion efficiency is improved.

The utility model relates to a double-cyclone separator, which comprises a first cyclone separation mechanism and a second cyclone separation mechanism, the first cyclone separation mechanism comprises a first cyclone generation component arranged on a collecting barrel, and the first cyclone generation component is provided with a first air inlet and a first air outlet; the second cyclone separation mechanism comprises a second cyclone generation part and a second separation barrel, the second cyclone generation part is arranged on the second separation barrel, and a second air inlet and a second air outlet are formed in the second cyclone generation part; the first air outlet is formed in the center of the bottom of the first cyclone generating part and is communicated to the second air inlet; the second separation barrel is arranged on the first cyclone generating part, the bottom of the second separation barrel extends to the position below the first cyclone generating part, a discharging opening is formed in the bottom of the second separation barrel, and a blocking cover capable of being opened and closed is arranged at the discharging opening. According to the utility model, the overall volume is reduced, meanwhile, the power loss in a transmission pipeline is reduced, and the working efficiency is higher.

The application relates to the technical field of solar cells, and provides a back contact cell assembly and a photovoltaic system. The back contact cell assembly is composed of a first cell string group and a second cell string group connected in series. Each cell string group comprises three parallel cell strings. The cell pieces in the cell strings are one-third cut cell pieces. A first bus bar serves as a positive output end of the assembly, a second bus bar serves as a negative output end of the assembly, and a third bus bar connects the first cell string group and the second cell string group in series. At least one of the three bus bars is arranged on the back surface of the cell pieces of the cell strings. The first cell string group and the second cell string group are respectively connected in parallel with a first bypass diode and a second bypass diode through a conductive connecting piece. In this way, the power loss of the assembly can be reduced, and the power generation per unit area of the back contact cell assembly is improved.

The application relates to a full GaN power electronic monolithic integrated circuit and a preparation method thereof, which comprises, from bottom to top, an insulating composite substrate, an AlN layer, a Si layer, a GaN / AlGaN buffer layer, a GaN layer and an AlGaN layer; a 2DEG layer is formed between the GaN layer and the AlGaN layer; the AlGaN layer is etched, a p-GaN layer is grown; a p-GaN layer gate portion is etched and filled with a passivation layer, and a gate metal is grown; source metal and drain metal are respectively grown on both sides of the p-GaN layer gate area; a deep groove is arranged between a driving circuit and a low-voltage tube, between a high-voltage tube and the low-voltage tube, and a medium is filled in the deep groove; and the full GaN power electronic monolithic integrated circuit is obtained through a top via and an interconnection process. The application can realize high efficiency and low power consumption, low parasitic effect, and reduce leakage current and switching loss.

The application provides a kind of photovoltaic module dirty grading early warning method based on multi-parameter fusion, belongs to new energy centralized photovoltaic power station technical field, can significantly alleviate or solve the problems of low accuracy, poor real-time and weak adaptability of existing photovoltaic module dirty early warning.The method comprises: collecting environmental parameters, historical dirty data and component power generation data, constructing regional dirty feature database;Collect and preprocess component surface temperature distribution data, environmental parameter data and surface image data;Identify the dirty area and quantify the dirty degree;Combine real-time environmental parameters to dynamically adjust the early warning threshold;Trigger the grading early warning and output cleaning suggestions or cleaning tasks;Verify the early warning effect after cleaning and optimize the associated model and dirty identification algorithm.The method can improve the early warning accuracy and operation efficiency, reduce the power generation loss.

This utility model discloses a cell balancing system, including a balancing module and a balancing control module. The balancing module includes multiple independently configured isolated power supply units and power supply units that supply power to each isolated power supply unit. Each cell in the cell pack is equipped with an isolated power supply unit, and each isolated power supply unit is connected to a balancing control module. The balancing control module sends independent balancing control signals to each isolated power supply unit. Under the control of the balancing control module, each isolated power supply unit starts or stops charging its corresponding cell, thereby achieving capacity balancing among the cells in the cell pack. The cell pack includes multiple cells connected in series, and the cell pack forms a loop with a bidirectional inverter to achieve charging and discharging operations with the power grid through the bidirectional inverter. The cells are lithium iron phosphate batteries. This utility model can achieve efficient balancing of the cells in the cell pack, with no limit on the number of cells to be balanced, low cost, and is suitable for widespread application.