25results about How to "Voltage balance" patented technology

The invention discloses a high-power-density hydrogen fuel cell power supply management integrated system, which integrates FCUVCUBMSDDCPDU functions, and is characterized in that after a pre-charging strategy completion signal is received, the load of a fuel cell is gradually increased according to a preset rate, and the energy demand, current, voltage and temperature changes of a VCU are monitored in real time; and dynamically adjusting parameters of the fuel cell unit FCU, the DCDC converter and the battery charging and discharging BMS according to an analysis result so as to adapt to load changes, so that the problems that in the prior art, a fixed strategy is often adopted for load increase during starting, VCU dynamic response, an FCU function, a DCDC converter function and a battery charging and discharging management BMS function are not efficiently integrated, and the service life of the VCU is influenced are solved. The FCU function and the DCDC converter function are dynamically adjusted according to current, voltage and temperature changes in the load increasing process, and the problem of electric pile protection discharge is solved.

The invention relates to a dynamic balance control method between multi-cluster parallel battery clusters, a controller, a multi-cluster parallel battery cluster system and an energy storage system. The method comprises the following steps: acquiring the voltage of each battery cluster; under the condition that the voltage difference value of any two battery clusters is smaller than or equal to a first voltage threshold value, the voltage average value of each battery cluster is determined; if the target battery cluster exists, the working state of a first converter connected with the target battery cluster is controlled according to the difference value between the voltage of the target battery cluster and the voltage average value, so that the target battery cluster is charged or discharged until the difference value between the voltage of any battery cluster and the voltage average value is smaller than or equal to a second voltage threshold value; wherein the difference value between the voltage of the target battery cluster and the voltage average value is greater than the second voltage threshold value, and the first voltage threshold value is greater than the second voltage threshold value. By adopting the method, the balance among the battery clusters can be effectively realized, and the service life of the energy storage system is prolonged.

An acquisition board and an energy storage device, the energy storage device comprises a plurality of cells and an acquisition board, the acquisition board comprises a conductive circuit layer and a balancing resistor which are stacked along the thickness direction of the acquisition board, and the conductive circuit layer is used for being electrically connected with each of the plurality of cells. And the balancing resistor is used for discharging the battery cell when one of the plurality of battery cells, the conductive circuit layer and the balancing resistor form an access. The acquisition board is used for acquiring state parameters of a battery cell in the energy storage device, such as the temperature or the voltage of the battery cell. According to the scheme, the acquisition board is integrated with the equalization resistor, and when the equalization resistor, the battery cell and the conductive circuit layer form a path, the equalization resistor can discharge the battery cell, so that the voltage of the battery cell is equalized, and the overcharge condition of the battery cell is prevented. As the equalization resistor is integrated in the acquisition board, the space of the energy storage device can be saved, and the energy density of the energy storage device is improved.

The invention discloses a storage battery remote nuclear device system capable of online monitoring and real-time switching, and relates to the technical field of storage batteries, the storage battery remote nuclear device system comprises a capacity checking host and mounting racks, one side of the capacity checking host is provided with a display panel, one side of the display panel is provided with an indicating lamp, and the mounting racks are mounted on two sides of the capacity checking host. When the storage battery remote nuclear device system capable of realizing on-line monitoring and real-time switching is used, the on-line switching module can be used for switching the positive electrode and the negative electrode of the battery in real time, and the full-on-line charging and discharging test of the storage battery can be realized by controlling the charging and discharging bus of the storage battery pack; in addition, the whole testing process can be remotely operated through the remote control module, after testing is completed, large current can be automatically restrained, so that it is guaranteed that the batteries are charged in a safe and non-heating mode, finally, voltage supplementing can be conducted on the single under-voltage batteries, and the voltage balancing effect can be achieved.

The invention discloses an energy storage system control circuit, and relates to the technical field of energy storage systems. The invention discloses an energy storage system control circuit which mainly comprises an energy storage battery module, an electric energy control module and a power supply module. Each module in the battery pack is connected with an equalization circuit in parallel, one end of a direct current-to-alternating current circuit in the electric energy control module is connected with the output end of the battery pack, and the other end of the direct current-to-alternating current circuit in the electric energy control module is connected with each module in the battery pack and the equalization circuit through a rectification filter circuit to form an electrical loop. Meanwhile, direct current of the battery pack is converted into alternating current to serve as a standby power supply through direct current to alternating current, alternating current of mains supply and alternating current converted by the battery pack serve as input of a switching power supply through automatic transfer switching equipment, flexible switching of the power supply is achieved, and stability and reliability of the energy storage system are improved.

The invention relates to the technical field of battery management, in particular to a new energy automobile battery device and a control method thereof. The method comprises the following steps: obtaining new energy automobile structure data, and carrying out battery shell structure feature extraction according to the new energy automobile structure data so as to obtain battery shell structure data; performing battery heat dissipation structure analysis according to the battery shell structure data to obtain new energy automobile battery shell heat dissipation data; performing battery pack structure feature extraction according to the new energy automobile structure data so as to obtain battery pack structure data; performing battery voltage equalization analysis according to the battery pack structure data to obtain battery voltage equalization data; performing battery short-circuit simulation according to the heat dissipation data of the battery shell of the new energy automobile so as to obtain new energy battery short-circuit data; according to the invention, a battery health control early warning task is realized based on a battery management technology.

The invention discloses an energy storage system and a voltage balance control method thereof, and belongs to the technical field of energy storage. The energy storage system comprises at least two battery clusters, each battery cluster comprises at least two battery packs and DCDC converters thereof, the battery packs and the DCDC converters are in one-to-one correspondence, the input end of each DCDC converter in each battery cluster is connected with one battery pack, and the output end of each DCDC converter in each battery cluster is connected with the DCDC converters of the same battery cluster and other battery clusters in parallel. The system can solve the problems that in the prior art, when battery clusters are combined, circulation is likely to be generated due to voltage imbalance, and the capacity of the battery clusters is affected.

The present invention discloses a control method and system for a LCCL type simplified three-level inverter, comprising: sampling the three-phase current on the output side of the LCCL type simplified three-level inverter and the voltage of two capacitors on the DC side; sending the obtained three-phase current on the output side to a fixed time regulator to obtain a first distribution factor of a P-type / N-type small vector duty ratio; sending the voltage of the two capacitors on the DC side to an error processing unit and a proportional regulator to obtain a second distribution factor of a P-type / N-type small vector duty ratio; adding the first distribution factor and the second distribution factor to obtain a total distribution factor; distributing the duty ratio of the small vector in the basic voltage vector by the total distribution factor to obtain the duty ratio of the P-type and N-type small vectors; and designing a switch sequence by using the duty ratio of the P-type and N-type small vectors and the duty ratio of the remaining vectors in the basic voltage vector except the small vector. The method of the present invention can effectively suppress the common-mode resonant current, ensure the balance of the midpoint voltage, and thus improve the reliability of system operation.

The present invention discloses a high-efficiency, low-harmonic, bidirectional elevator energy recovery converter with a self-stabilizing function, which belongs to the field of power electronics technology. The main circuit of the bidirectional elevator energy recovery converter of the present invention includes a voltage stabilizing circuit, a bidirectional elevator energy recovery converter circuit and an AC side midpoint generating circuit; the voltage stabilizing circuit can ensure the voltage balance of the DC bus capacitor, so that the converter has a self-stabilizing function; the bidirectional elevator energy recovery converter circuit is used for electric energy recovery of the elevator system, and can recover the regenerative energy generated by the motor and feed it back to the power grid or storage device during the elevator up and down process; the elevator energy recovery converter proposed by the present invention can realize the bidirectional flow of energy and achieve the purpose of energy saving; and it adopts a multi-level topology, with a large number of output voltage levels, which can effectively reduce the output current harmonics and effectively reduce the impact on the power grid.

The invention relates to a flying capacitor three-level BUCK circuit and a control method thereof, in particular to a flying capacitor three-level BUCK circuit based on double voltage-sharing control and a control method thereof, which are used for solving the problem of integrated optimization of voltage-sharing control and pre-charging technologies under various working conditions in the existing flying capacitor control technology. And a comprehensive solution is still lacked. The flying capacitor three-level BUCK circuit based on double-voltage-sharing control and the control method thereof comprise a direct voltage-sharing flying capacitor three-level BUCK conversion circuit and an automatic voltage-sharing control circuit which are respectively used for direct voltage sharing and indirect voltage sharing, and the voltage balance of a flying capacitor C2 can be ensured in various working states.

The invention relates to the technical field of energy storage equipment, and discloses an equalizing charging method for an energy storage device, the energy storage device and equipment, and the method comprises the steps: carrying out the pre-charging of the energy storage device, and carrying out the sorting of SoC values of a plurality of energy storage units on each phase of line under the condition that the DC side voltage is stable; performing partial dynamic cutting on the plurality of energy storage units on each phase of line according to the sorting result, and determining that the energy storage device completes pre-charging under the condition that the SoC values of the remaining energy storage units after cutting all reach a preset value; and performing grid-connected operation on the pre-charged energy storage device, performing in-phase equalization control on the plurality of energy storage units on each phase line according to the total SoC mean value and the in-phase SoC mean value of the energy storage device, performing inter-phase equalization control on the energy storage device according to the negative sequence component of the three-phase alternating current power grid, and quickly charging the energy storage device through a power ring. According to the invention, the over-charge or over-discharge phenomenon of individual energy storage units can be avoided, and the reliability of the energy storage device is greatly improved.

The invention discloses a charging and discharging device, an adapter and electronic equipment, and the device comprises at least two charging and discharging interfaces which are used for connecting power supply equipment or power receiving equipment; the input ends of the switching tubes are connected with the charging and discharging interfaces in a one-to-one correspondence manner, and the output ends of the switching tubes are connected with the input end of the voltage balancing circuit; the output end of the voltage balancing circuit is connected with the input end of the bidirectional conduction element, and the voltage balancing circuit is used for balancing the voltage among the switching tubes, so that the voltage among the switching tubes is balanced; the output end of the bidirectional conduction element is connected with a load, and the bidirectional conduction element has an on-off state; and the power management module is connected with the bidirectional conduction element and all the switching tubes and is used for controlling the on-off states of the bidirectional conduction element and all the switching tubes so as to realize single-path or multi-path bidirectional charging of the load through the power supply equipment or single-path or multi-path bidirectional discharging of the load through the power receiving equipment. The charging and discharging device provided by the invention realizes a flexible and selectable bidirectional charging and discharging function.

The invention relates to the field of batteries, the battery pack repairing method and system are used for repairing a battery pack comprising a plurality of battery cells connected in series, and the repairing method comprises the following steps: carrying out voltage equalization on the battery pack in a repairable state; and executing an abnormal battery cell replacement step: detecting whether an abnormal battery cell with abnormal impedance exists in the plurality of battery cells after voltage equalization, and replacing the abnormal battery cell with a normal battery cell. According to the battery pack repairing method and system, the service life of the battery pack can be prolonged, the repairing efficiency is high, and the cost is low.

The invention discloses a high-frequency power supply intelligent control system based on high-voltage voltage-sharing rectification, and the system comprises a control cabinet, a control circuit board is fixedly installed in the control cabinet, a high-frequency power supply automatic control mechanism is integrated on the control circuit board, and the current and voltage are monitored and controlled in real time through the high-frequency power supply automatic control mechanism. A ventilation opening is formed in the lower surface of the control cabinet, a cooling fan is fixedly installed in the control cabinet, the cooling fan is flush with the ventilation opening, and a fire extinguishing sealing mechanism is rotationally installed on the lower surface of the control cabinet. Through the design of the high-frequency power supply automatic control mechanism, remote monitoring and control of the system are realized, cooperative work of all components of the whole system is realized, and stable high-frequency power supply, monitoring and remote control functions are finally realized through a series of conversion, monitoring and control processes from the high-frequency power supply module.

The present application relates to the technical field of energy storage power supply, and mainly provides a resonant cavity current control circuit and an energy storage system, the circuit comprising a voltage regulating module, a voltage detection module connected with the voltage regulating module and a clamping control module, the voltage detection module and the voltage regulating module are also connected with a first bus capacitor and a second bus capacitor. The voltage detection module is used for detecting the bus voltage of the two bus capacitors, and when there is a difference between the two bus voltages, the voltage regulating module is controlled to work to adjust the first bus voltage and the second bus voltage. When the voltage regulating module works, the clamping control module will control the voltage regulating module to stop working when it is determined that the current signal of the voltage regulating module does not meet the preset condition. Based on this, the bus voltage balance can be realized through the voltage regulating module, and then the two LLCs in the three-level inverter work at the same time, without the need for a single LLC to bear excessive peak current, thereby reducing the cost, improving the service life and reliability of the system.

The application relates to a kind of equalization circuits of multiple lithium battery groups in series, the negative pole of lithium battery group is connected with the negative pole of voltage sampling unit, the negative pole of capacitor C3 and the negative pole of winding L1, the positive pole of lithium battery group 1 is connected with the anode of diode of photoelectric coupler G1 and G2, the positive pole of voltage sampling unit, the positive pole of capacitor C3, the cathode of rectifier diode D1, the anode of rectifier diode D1 is connected with the positive pole of winding L1, the cathode of diode of photoelectric coupler G1 and G2 is connected with two enable ends of voltage sampling unit, the power supply positive pole and negative pole of equalization driving unit are connected with the cathode and anode of voltage stabilizing diode D5 in voltage dividing circuit in parallel, the output end of equalization driving unit 31 is connected with the gate of field effect transistor T1, the source of field effect transistor T1 is connected with the positive pole of winding L5, the negative pole of winding L5 is connected with the positive pole of total lithium battery group, the application effectively solves the capacity difference problem existing between series lithium battery groups, can make the voltage of lithium battery group equal, so that lithium battery group capacity is fully utilized.

The invention discloses a multiplexing switched capacitor equalization circuit for a single battery string and a control method thereof, and relates to the field of electrochemical energy storage. The equalization circuit is composed of a switch array and a capacitor network, the battery string is divided into a plurality of battery modules, the switch array and the battery modules are correspondingly arranged, and each battery module is connected to the multiplexed capacitor network through the corresponding switch array. All the switch arrays adopt pulse phase shift control, and when the switch arrays are alternately driven, the multiplexed capacitor network can transfer the energy of the high-voltage battery modules in the battery string to the low-voltage battery modules, and can also transfer the energy of the high-voltage single batteries in the battery modules to the low-voltage single batteries. And voltage balance of the whole battery string can be finally realized through continuous charging and discharging of the capacitor network. According to the invention, the voltage equalization of the single cell string is completed through the multiplexed capacitor network, and the circuit is of great significance to the miniaturization and compactness design of a single cell string equalization circuit.

The application provides a charging control module, a method, a smart terminal and a charging system. The charging control module comprises a charging unit, at least two batteries, at least two switch tubes and a control unit. The charging unit is connected with the positive poles of the at least two batteries, the negative poles of the batteries are respectively connected with the first ends of the switch tubes, the second ends of the at least two switch tubes are connected with each other and grounded, and the control unit is connected with the control ends of the switch tubes. During the charging process of the charging unit for the batteries and / or during the discharging process of the batteries, the control unit controls the voltage difference between the two batteries through the switch tubes. The above technical scheme can control the voltage difference between the at least two batteries, ensure the voltage balance during the charging and discharging, and improve the charging efficiency.

The invention belongs to the technical field of power electronics, and relates to a SiC device five-level split inverter pulse rejection modulation method and system, and the method comprises the steps: generating two groups of reverse laminated carriers according to a set reference signal, generating two different carrier signals according to the sizes of the two groups of reverse laminated carriers and a set modulation wave, and outputting the two different carrier signals. Two auxiliary modulation waves are generated according to the actual voltage of the floating capacitor, the expected lower limit threshold value and the expected upper limit threshold value, a low-frequency driving signal is generated according to the size of the set modulation waves, and a high-frequency driving signal of each phase is generated according to the size of the output current of each phase, the auxiliary modulation waves and the carrier signal. A high-frequency driving signal is generated only in a half fundamental wave period, and a low-frequency driving signal is generated in the other half period, so that the loss of the driving circuit is effectively reduced, dead-zone time does not need to be added between the high-frequency driving signals, the dead-zone effect is avoided from the source, the current output harmonic wave is reduced, the current distortion is reduced, and the output current quality is improved; and the voltage balance of the suspension capacitor is kept through the adjusting effect of the auxiliary modulating wave.

The application relates to the technical field of lithium batteries, in particular to a storage battery equalization device and an equalization method. The storage battery equalization device comprises a main control chip, a storage battery pack, a plurality of bidirectional converters and a low-voltage bus; a plurality of single batteries of the storage battery pack are arranged in correspondence with the plurality of bidirectional converters; the main control chip can calculate the electric quantity value of each single battery and screen out the single batteries with the highest and lowest electric quantity values; when the difference between the highest and lowest electric quantity values reaches a predetermined electric quantity value, the main control chip controls the bidirectional converter corresponding to the single battery with the highest electric quantity value to step up to the low-voltage bus, and controls the bidirectional converter corresponding to the single battery with the lowest electric quantity value to step down to the single battery. The storage battery equalization device and the equalization method solve the problems that the existing active equalization circuit is complex, the cost is high, the high-voltage side of the unidirectional converter is prone to damage, and the unidirectional converter occupies a large volume.

This invention provides a method, apparatus, system, and aircraft for controlling parallel charging of multiple battery packs, relating to the field of battery management technology. In the hardware access stage, based on the initial voltage sorting results, the invention dynamically calculates and sets a pre-charge current threshold by real-time monitoring of the voltage difference and the real-time internal resistance of the battery packs. This precisely limits the circulating current instantaneously generated by the contactor in the closed charging circuit to a safe range, achieving the function of the voltage equalization module in suppressing inrush current and voltage balancing without additional hardware. In the software management stage, the total SOC value is calculated based on at least one of the health status and rated capacity of each battery pack. This ensures the feedback accuracy of the total SOC value even without a voltage equalization module, and dynamically distributes the current according to the health status of each battery pack, achieving the balancing effect of the voltage equalization module at the logical level. Therefore, this invention achieves safe and efficient parallel charging of multiple battery packs without using a voltage equalization module.

The present application discloses an AC power surge protector, which relates to the technical field of power surge protection, and includes a cylinder body, a cover body, an electrode column and a varistor group, wherein the electrode column is coated with a first insulator, a second insulator is arranged in the cylinder body, a positioning groove for placing the varistor group is arranged in the second insulator, the varistor group includes a plurality of varistors stacked in sequence, and each varistor is coaxially placed in the positioning groove, the surface of the varistor is provided with an aluminum sand surface, and a sand pit is arranged on the aluminum sand surface, an aluminum film is arranged between two adjacent varistors, and a clamping structure for clamping the electrode column against the varistor group is arranged on the cylinder body. A gas discharge tube is also installed in the cylinder body, and the gas discharge tube is respectively connected to the varistor group and the cylinder body, and a grounding column is arranged at the bottom end of the cylinder body. The present application ensures that each varistor can evenly share the voltage and current, thereby extending the service life of the AC power surge protector.

The invention discloses a converter port voltage balancing method of a full-direct-current system, the voltage balancing method is applied to the full-direct-current system, and the system comprises a fan, an AC / DC converter, a DC / DC converter, a DC / AC converter and an alternating-current power grid. The voltage balancing method comprises the following steps: carrying out VOC voltage stabilization control on the machine side DC voltage of the AC / DC converter based on a preset AC / DC converter model; performing voltage control on the DC / DC converter by adopting a control strategy of outer ring port voltage and inner ring output current, so that the output port voltage of the DC / DC converter is balanced; and carrying out system transmission power stable control on the DC / AC converter according to a preset inverter control strategy, wherein the preset inverter control strategy comprises a network following type control strategy and a network constructing type control strategy. The technical problems that an existing full-direct-current system is difficult to achieve voltage balance of a convergence network direct-current port, and the absorption pressure of an alternating-current grid-connected point cannot be relieved can be solved.

The wind power generation device comprises a support, a rotating shaft and a wind wheel, the wind wheel converts wind energy into rotating mechanical energy of the rotating shaft, the rotating shaft drives a gear disc fixed to the rotating shaft, and the rotating shaft is in transmission connection with a worm and gear reducer and a magnetic suspension generator in sequence through the gear disc to achieve conversion from mechanical energy to electric energy. The rotating speed can be increased by using the worm and gear speed reducer, so that the magnetic suspension generator can work at a more suitable rotating speed, and the power generation efficiency is improved; a wind speed sensor for monitoring wind speed changes in real time is arranged on the wind wheel, movable blades are arranged on the two sides of each fixed wind blade of the wind wheel respectively, and the movable blades can achieve dynamic adjustment of the inclination angles of the movable blades relative to the fixed wind blades under the action of an electric push rod, so that the wind power generation device can work in the optimal state at different wind speeds, and the wind power generation efficiency is improved. The capturing efficiency of wind energy is optimized, the wind energy utilization rate and conversion rate are improved, and the output power of the generator is kept constant in cooperation with a gear disc and a worm and gear speed reducer.

The utility model provides an energy-saving structure of an elevator, which can solve the problem of voltage imbalance, improve the operation efficiency of the elevator and save electric energy. Comprising a super capacitor bank, a plurality of single voltage balancing modules, a resistor R1, an MOS tube Q1 and a controller, the super capacitor bank comprises super capacitors C1-Cn, the super capacitors C1-Cn are sequentially connected in series, the number of the single voltage balancing modules corresponds to the number of the super capacitors, the single voltage balancing modules adopt bidirectional DCDC converters, and the single voltage balancing modules are connected with the MOS tube Q1. The output ends of the single voltage balancing modules are sequentially and correspondingly connected to the two ends of the super capacitors C1-Cn, the input ends of the multiple single voltage balancing modules are connected in parallel and then connected to the input end IN1 of the controller, one end of the resistor R1 is connected with one end of the super capacitor bank and the controller, the other end of the resistor R1 is connected with the controller and the drain electrode of the MOS tube Q1, and the other end of the resistor R1 is connected with the drain electrode of the MOS tube Q1. The grid electrode of the MOS tube Q1 is connected to the controller, the source electrode of the MOS tube Q1 is connected to the positive electrode end of the direct current bus, and the other end of the super capacitor bank is connected to the negative electrode end of the direct current bus.