115results about How to "Fast power supply" patented technology

The invention relates to a method for restoring power supply of a power distribution network containing a distributed power source. The method is based on heuristic rules, performs dynamic island partition on the distributed power source, utilizes a connection switch to guarantee a power supply restoration scheme of the power distribution network to be adaptive to output changes of the distributed power source and continuous power supply of important users, and enables the intelligent power distribution network to operate safely, reliably and economically. Power supply restoration of the power distribution network comprises the steps that the power failure range of the power distribution network is determined by fault location information and an operating state of the power distribution network before the fault happens; and the distributed power source in the fault area is matched with the connection switch connected with the fault area, corresponding section switches are actuated, and radial operation of the power distribution network except for the distributed power source is ensured. The distributed power source is fully utilized to improve reliability of the power supply of the power distribution network, searching space is greatly reduced, and optimum strategy searching time is shortened. Therefore, the method is suitable for power supply restoration real-time operation of the power distribution network containing the distributed power source.

The invention provides a power supply method and a power supply device for an electronic device and the electronic device. The electronic device comprises a power supply module, a charging module, a first energy storage module, a second energy storage module and a control module, wherein the power supply module comprises an external energy conversion module for converting external energy into electric energy; the charging module is used for charging by using the converted electric energy; the first energy storage module and the second energy storage module are used for storing the converted electric energy; and the control module is used for controlling both the first energy storage module and the second energy storage module in a charging state or the first energy storage module in a charging state while the second energy storage module in a power supply state, when the second energy storage module is in a charging state, the charging module or the first energy storage module charges the second energy storage module, and when the voltage of the first energy storage module is higher than that of the second energy storage module, the first energy storage module charges the second energy storage module. The technical proposal can reduce the dependence of the electronic device on a battery and achieve the effects of energy conservation and environmental protection.

The invention discloses a power distribution network fault detection and positioning analysis system. The system comprises a monitoring data collecting module, a fault detection positioning module, amonitoring module and a mobile terminal unit; the monitoring data collecting module is connected with the fault detection positioning module through a communication network, the fault detection positioning module is connected with the fault detection positioning module through a cable, and the fault detection positioning module is connected with the monitoring module and the mobile terminal unit through a GPRS wireless communication module. The system has the advantages that a big polling worker can perform rapid on-site troubleshooting and fault removal, a mobile phone of a line polling worker is used, by means of mobile phone background software of the polling worker, the background software can obtain related information for fault removal, rapid fault recovery and power supply are facilitated, real-time and objective intelligent monitoring, evaluation and fault positioning can be performed on the health state of a power distribution network main device, the automatic degree is high,and the efficiency is high.

The invention discloses a method for recovering power supply after stripping started by direct-current ground protection, which includes the following steps: (1) failure detection: a direct-current ground protection device is connected with a power supply system, and is used for detecting the failure of the power supply system; the power supply system comprises two uplink grid contact lines, two downlink grid contact lines and a plurality of feeder cabinets, and any feeder cabinet is connected with the two uplink grid contact lines or the two downlink grid contact lines; all the feeder cabinets are connected with the direct-current ground protection device, and when failure is detected by the direct-current ground protection device, all the feeder cabinets are tripped; (2) response processing: according to whether the feeder cabinets are connected with the two uplink grid contact lines and the two downlink grid contact lines at the same time, processing is carried out separately according to two conditions. By improving the failure recognition theory of the power supply system, the method for recovering power supply after stripping started by direct-current ground protection and the like, the invention can achieve the advantages of high failure recognition efficiency and high power supply recovery speed.

The invention provides a vehicle-mounted one-key constant-frequency power generation system and a vehicle-mounted one-key constant-frequency power generation control system and method. A starter is connected with an electrically controlled engine through a belt; the electrically controlled engine is connected with a power distributor through an output shaft; a gear group in the power distributor outputs power to one end of a wet type clutch; the other end of the wet type clutch is connected with an alternating current power generator; a power distribution controller is provided; an engine management unit is connected with the power distribution controller through a controller area network (CAN) bus; the input end of the power distribution controller is connected with a pressure sensor arranged on the wet type clutch, an engine oil temperature sensor arranged on the power distributor, a rotating speed sensor arranged on the output shaft of the wet type clutch and a one-key power generation switch; and the output end of the power distribution controller is connected with a clutch switching electromagnetic valve. Due to one-key operation, stable constant-frequency power can be supplied to a vehicle-mounted electric appliance within two seconds, so that the electric appliance is started quickly; and the vehicle-mounted one-key constant-frequency power generation system is especially suitable for special vehicles with quick power supply response requirements.

The invention discloses an intelligent cable plug and further discloses an intelligent cable plug detection system. The intelligent cable plug comprises a hollow body and at least one temperature sensor. The temperature sensor is located in the hollow body and comprises a detection module and an alarm module, wherein the detection module is used for detecting the real-time temperature value of the cable plug, and the alarm module is used for judging whether the cable plug operates abnormally or not according to the real-time temperature value and sending alarm information according to judgment results. Compared with the prior art, because the temperature of the intelligent cable plug can be monitored in real time, whether the cable plug operates abnormally or not is judged according to the real-time temperature value, and the alarm information is sent according to the judgment results, the temperature of the cable plug can be intelligently detected while an alarm for prompting can be given, faults can be found in time and prejudged, fault treatment can be carried out in time to recover normal power supply, power supply reliability is improved, and working efficiency is improved at the same time.

The invention discloses a method for quickly searching a grounding fault point of electrical equipment. An electrical circuit grounding fault quick tester is adopted in the method. The electrical circuit grounding fault quick tester is composed of such three parts as a converter, a signal operation box and a phase angle instrument, wherein a main circuit of the converter is connected with a circuit of the signal operation box and a circuit of the phase angle instrument, operations and control are carried out by a power switch, a start switch and an adjusting knob on an operation panel of the signal operation box, and variations in the position of a current transformer are detected by using the equipment to find the fault point. The method disclosed by the invention is mainly applied to searching fault points for large and medium-sized electrical equipment, a stator and a rotor of a turbogenerator, stators and rotors of various large and medium-sized motors, grounding faults of cables and overhead lines, and also to controlling circuits. Electrical equipment can differentiate each turn in each phase and can test current at each point, and has the advantages of simple and convenient operation, and ability of being quick and accurate. The method disclosed by the invention is applicable to fault point detection in using, manufacturing and mounting large and medium-sized electrical equipment.

The invention discloses a mobile modular gas turbine power station. The mobile modular gas turbine power station is formed by connecting a first vehicle, a second vehicle and a third vehicle, the first vehicle comprises a gas turbine power system, a transmission system and a semitrailer chassis system, the gas turbine power system comprises a starter, a gearbox, a high-speed coupler and an engine,the transmission system is composed of a low-speed coupler, a first bearing, a transmission shaft, a second bearing and a flexible coupler, and a second vehicle power generation and distribution system comprises a generator, a generator installing base, a generator power shaft and a power distribution cabinet. According to the mobile modular gas turbine power station, a gas turbine is adopted asa prime mover, a power generation system composed of the gas turbine is compactly integrated on a movable chassis, and by adopting a combined mode, the power system, the power generation and distribution system and an exhaust system are correspondingly placed on different mobile carrier platforms, so that modular assembly is realized, and meanwhile, an independent exhaust noise reduction system isadopted for carrying out exhaust heat dissipation and high-frequency noise reduction on the gas turbine.

The invention relates to a pure-optical HDMI optical cable based on wireless transmission. The pure-optical HDMI optical cable comprises a high-definition multimedia transmitting module, a high-definition multimedia receiving module and an optical fibre; one end of the high-definition multimedia transmitting module is connected to a signal source; the other end of the high-definition multimedia transmitting module is connected to the high-definition multimedia receiving module through the optical fibre; a wireless transmitting module is also built in the high-definition multimedia transmitting module; the high-definition multimedia transmitting module is connected with a wireless receiving module built in the high-definition multimedia receiving module through the wireless transmitting module; an electric-optical conversion module used for converting electric signals into optical signals is also built in the high-definition multimedia transmitting module; and an optical-electric conversion module used for converting optical signals into electric signals is also built in the high-definition multimedia receiving module. The pure-optical HDMI optical cable disclosed by the invention has the characteristics of being high in transmission rate and electromagnetic interference resistant capability.

The invention relates to an overhead power line of an electric power network, in particular to an overhead power line with the functions of automatic protection, sleet covering prevention and automatic sleet melting. The structure of the overhead power line is a system which causes the overhead power line to form a short circuit, the equipment thereof comprises a line temperature-humidity measurement and control device, a microcomputer processing and protection system, a special relay protection device, a line high-voltage circuit breaker, an electric control isolating switch capable of forming the short circuit among conductors, a power source protection control switch, and a power source unit system which is used in short circuit current and comprises the elements such as a high-voltage DC or low-voltage AC current regulation and control device, a current-voltage measurement and control device, a fuse, etc. The first technical scheme of the overhead power line is that the conductors are directly switched on to form short circuit without loads, and then the power is supplied to cause the conductors of the power network to generate heat, thus preventing the line from sleet covering and automatically melting the sleet. The second technical scheme of the overhead power line is that the connection mode of the devices used in the first technical scheme is changed to establish an automatic sleet melting system for sleet covering of the line.

The invention discloses a personal electric shock prevention control method of a power distribution network with a neutral point which is not connected with ground. The personal electric shock prevention control method comprises the steps of firstly, acquiring a three-phase voltage instantaneous value on a 10kV outgoing line at a substation; secondly, extracting a zero-sequence voltage by the three-phase voltage instantaneous value, and calculating three-phase voltage abruptly-changing quantity; thirdly, judging whether single-phase human body electric shock accident is generated or not according to an integral criterion combined by a zero-sequence voltage absolute value and the three-phase voltage abruptly-changing quantity, and controlling a circuit breaker to be closed; and finally, judging accident removal by the zero-sequence voltage, and controlling the circuit breaker to be disconnected. According to the method, single-end three-phase voltage information is employed, personal electric shock prevention rapid control of the power distribution network with the neutral point which is not connected with the ground is achieved, and the personal electric shock prevention control method has important significance to personal safety protection and normal power supply.

The invention provides a power distribution network fault positioning method based on a short circuit current, and relates to power distribution network maintenance and repairing, in particular to a method for quickly looking up a short-circuit fault of a power distribution network. The method comprises the steps that maximum-mode impedance per-unit values and minimum-mode impedance per-unit values in different operation modes are converted into maximum-mode impedance per-unit values and minimum-mode impedance per-unit values of a 35-KV busbar, a 20-KV busbar and a 10-KV busbar in different operation modes; 2, according to an impedance parameter of a fault line, the distance between a short-circuit fault point of the line and an outlet switch of a transformer substation in the current operation mode is calculated. The method is simple and feasible, when the power distribution network line generates the short-circuit fault, the place where the fault point is possibly located can be quickly judged according to the fault current and type and the farthest distance and the closest distance between the short-circuit fault point and the outlet switch of the transformer substation, the distance between the short-circuit fault point and the outlet switch of the transformer substance is accurately positioned, and therefore operation and maintenance personnel can quickly find the fault and isolate or eliminate the fault.

The invention relates to a remote interactive operation and maintenance system for a high-voltage cable line, and the system comprises a mobile terminal, a mobile communication network, a server, and an expert client. The mobile terminal is connected with the server through the mobile communication network, and the server is connected with the expert client. The server stores a big database, and the big database stores the operation and maintenance data of the high-voltage cable line. An onsite operation and maintenance worker carries out inspection on site, and the current onsite information is collected through the mobile terminal, and then is transmitted to the server through the mobile communication network. When emergency happen to the high-voltage cable line, an expert obtains the current onsite information and the operation and maintenance data of the high-voltage cable line in the big database from the server through the expert client, makes a corresponding operation and maintenance scheme, finally transmits the operation and maintenance scheme to the mobile terminal, and carries out the remote instruction. Compared with the prior art, the system achieves the remote interaction of the expert with the onsite operation and maintenance worker, improves the work efficiency of operation and maintenance, and improves the reliability of power supply.

The invention discloses a variable target control method of a flexible direct current power transmission system. According to the method, a new variable target control link is added after a link of calculation of an error between a target value and an actual value through converter outer loop control. The input control reference quantity under dual-loop control of the converter of the flexible direct current power transmission system is subjected to tracking regulation; and the input control reference quantity under dual-loop control of the converter is divided into multiple gradually progressive small target values according to the regulation limit of the system to enable the system to reach the divided small target values within the given time in an non-overshoot and quick manner, so that the target value of the input control reference quantity is reached gradually, and non-overshoot and quick tracking of the control reference quantity can be realized. In addition, after variable target control is added, the system dual-loop controlled PI link parameters can be set more easily, so that different working condition requirements of the system can be satisfied.

The invention discloses a universal base assembly. The universal base assembly comprises a base, a voltage boosting plate and a first switch, wherein a connector is arranged on the top wall of the base; the voltage boosting plate is arranged in the base and connected with the connector; and the first switch is used for detecting whether electric equipment is placed on the base, is arranged in the base and is connected with the voltage boosting plate. According to the embodiment of the invention, the universal base assembly has high safety and practicability.

The invention discloses a quick charging portable power source. The quick charging portable power source comprises a lithium titanate battery mounted on a battery protecting panel, a charging circuit for charging the lithium titanate battery, an output circuit for quickly charging an electronic product through power output of the lithium titanate battery, and an MCU (microprogrammed control unit) for achieving charging and discharging control. The battery protecting panel is provided with a battery protecting circuit and a battery voltage divider resistor which are applicable to the lithium titanate battery; the battery voltage divider resistor is composed of a pull-down resistor R9 with a nominal resistance of 820 R, and the pull-down resistor R9 is loaded on the voltage detecting end WD01+VDD of the circuit of the battery protecting panel so that the voltage of the FB point of the circuit corresponds to the standard value of the lithium titanate battery. By means of the design, the quick charging portable power source has the advantages of being high in charging speed, security performance and conversion efficiency.

The invention discloses a switching method for a neutral point grounding mode. Controllable impedance is arranged between a neutral point of a power grid and ground and is switched to different resistances during normal running of the power grid and in a single-phase grounding fault. The switching method comprises the steps of arranging that the neutral point is not connected with ground during normal running, and switching to the situation that a neutral point arc elimination coil is connected with the ground or a high-value resistor is connected with the ground when the single-phase grounding fault occurs; and switching to the situation that the neutral point is not connected with the ground if the fault disappears within set time, switching to the situation that a medium-value resistorof the neutral point is connected with the ground if the fault does not disappear, and switching to the running mode that the neutral point is not connected with the ground after the single-phase grounding fault is eliminated. The advantages of various grounding modes are compatible, and the high power supply reliability of a power grid is improved.

The invention discloses a repairable iron tower anti-icing disaster reduction design method. The method comprises the steps: calculating the electrical load effect of an iron tower under normal use condition combination; calculating the internal force of each component of the iron tower according to the electrical load effect; determining Angle steel specifications and bolt specifications and numbers; according to the selected section size of the angle steel component, conducting bone type weakening section size design on the ground wire support and the wire cross arm main material angle steel; carrying out bearing capacity rechecking on the bone type weakened section under the normal use working condition. The bearing capacity of the bone type weakening section is compared with the bearing capacity of the bolt at the joint of the gusset plate, and if the bearing capacity of the bone type weakening section is smaller than the bearing capacity of the bolt at the joint of the gusset plate, the design is finished; if not, the number of bolts at the joint of the gusset plates is increased, and it is ensured that the bearing capacity of the bolts at the joint of the gusset plates is larger than that of the bone type weakened section. The problem that the whole iron tower collapses due to icing overload or deicing jump in winter is solved.

The invention discloses a flexible loop closing device and a control method thereof. The device comprises a back-to-back high-frequency isolation unit and a switch. The back-to-back high-frequency isolation unit comprises a first voltage source type converter, a dual-active-bridge conversion circuit and a second voltage source type converter which are sequentially connected in series. The switch is connected with the back-to-back high-frequency isolation unit in parallel, one end of the switch is connected with the first voltage source type converter, and the other end of the switch is connected with the second voltage source type converter. According to the invention, flexible interconnection between different alternating current areas and rapid power supply of a fault area can be realized, flexible switching of transformer operation modes can be realized, and efficient operation of the system is ensured.

The invention relates to a direct-current power surge suppresser which includes the surge voltage sampling circuit, the voltage clamping circuit, the over-voltage switching circuit, the solid state relay and the cabinet. After the electrify, the surge voltage sampling circuit carries on the timing sample on the change of the supply voltage, when the signal voltage surpasses the threshold value of the voltage clamping circuit, the over voltage switching circuit lead, the control input end of the solid state relay is close to the'0V' electric potential, the solid state relay closure, thus has protected the subsystem equipment; after the surge, the sampling voltage of the surge voltage sampling circuit will be lower than the threshold value of the voltage clamping circuit, the over voltage switch closure, the solid state relay lead, the subsystem obtains the normal power supply. Because of using the separate part join structure, realized the protection function in the direct-current power supply system. It has enhanced the anti-impact ability of the system, has protected the subsystem equipment; after the surge, subsystem has rapid normal power supply. It is economical, safe and practical.

The invention relates to a safety control method and system for an overhead line system isolating switch monitoring system. A digital communication remote control locking function avoids a possibilitythat an overhead line system isolating switch malfunctions due to an unsatisfactory field operation condition. The remote control locking function is introduced by a centralized monitoring device ona centralized monitoring screen. The presence or absence of a blocking signal is identified by a locking entry point opening and closing combination. The centralized monitoring device sends a virtuallocking remote signal point status to an isolating switch RTU (Remote Terminal Unit) through a GOOSE network, dispatches and sends an unlocking signal, and achieves directly unlocking in order that the RTU is not controlled by the locking signal, thereby greatly reducing the probability of maloperation. The centralized monitoring device, dispatching, and the comprehensive background are all in parallel position, and all communicate with the isolating switch RTU directly, and the isolating switch RTU is a direct control RTU device. The scheme of reducing fault points can prevent the isolating switch operation failure and telecommand false alarm.

The invention discloses a power supply line detection method including an electronic controller, a fiber transceiver, a temperature sensor, a distribution network computer terminal, and a faulty section communication device. The result of whether the relay protection is required is determined by the result of the real-time frequency analysis of the voltage parameters and the AC signal, so that the accuracy of relay protection is improved. The faulty section position is accurately determined by the wireless transmission of the acquired fault signals, and the protection ranges and protection manners of the relay protection devices away from the faulty section at different section distances are determined, so that the overstep and over-protection-range misoperations of the relay protection devices can be prevented. According to the invention, the fault points can be found as soon as possible, the fault reasons can be conveniently found out and the faults can be eliminated, and the detection precision is high under the condition of guaranteeing the grid safe and reliable running.

The invention discloses a black start method, device and equipment of a hybrid generating microgrid. The black start method comprises the steps of obtaining the number, the type and the power-supply power of distributed power sources which can be started to supply power currently; judging total power of emergency equipment which needs to be restored into operation in a current blackout area, wherein information of the emergency equipment is pre-registered in a control system and is divided into a plurality of priorities according to the emergency degree; determining a safe start environment and starting a boosting transformer of an AC bus docked to a large power grid; and distributing the power-supply power of the distributed power sources to the emergency equipment according to the priorities. According to the black start method, device and equipment, objects of the emergency equipment are preset and the priorities are set for the emergency equipment to adapt the condition of unstablepower supply of the hybrid generating microgrid in black start, so that the hybrid generating microgrid can firstly provide the existing power-supply power to the emergency equipment with high priorities, thereby maintaining the order of a power supply area and quickly restoring power supply.

The invention discloses a starting battery provided with a super capacitor and used for a fuel vehicle and an implementation method of the starting battery. The battery comprises a battery box seat and a box cover; a box body is provided with a partition plate, a wire penetrating groove opening, a clamping groove and a locking assembly. The partition plate is fixedly arranged in the middle in thebox body; the wire penetrating notches are formed in the two sides of the upper end of the partition plate. The clamping groove is formed in the upper end of the inner side wall of the box body, the locking assemblies are arranged on the two sides of the upper end of the partition plate and the upper end of the inner side wall of the box body respectively, the lithium iron phosphate battery assembly and the super capacitor assembly are movably installed in the box body, and the lithium iron phosphate battery assembly and the super capacitor assembly are connected in parallel through a wire. According to the invention, the lithium iron phosphate battery assembly and the super capacitor assembly can be installed more conveniently and fixed more firmly, the lithium iron phosphate battery canbe protected, damage caused by excessive discharge is prevented, and the service life is prolonged.

The present invention relates to an energy supply vessel and an energy supply method using same. The energy supply vessel comprises a hull; an electricity storage device for storing electricity at thehull; a charging port provided at the hull for an electrical connection with an external electricity supply target using electricity as a power source, so as to charge the electricity supply target with the electricity supplied from the electricity storage device; a communication unit provided at the hull so as to allow communication with the electricity supply target; a propeller for generatinga propulsive force such that the hull moves for the electrical connection with the electricity supply target; and a control unit for controlling the electricity storage device, the charging port, thecommunication unit, and the propeller according to an operation signal of an operation unit or a determined process. According to the present invention, electricity can be easily supplied to an electric propulsion ship, an underwater drone, a water drone, an air drone, an electric vehicle, and other various electricity supply targets using electricity as a power source on the water, under the water, or near the water, or a battery can be replaced and, furthermore, a battery in a floatel can be charged, or the energy supply vessel can be used as an uninterruptible power supply device for a floatel, a waterside hotel, or the like. Therefore, the present invention can guarantee stable on-the-water and waterside charging conditions, movement, and electricity use of an electricity supply targetusing electricity as a power source, quickly and conveniently supply electricity to the electricity supply target using electricity as a power source, at any time and at a desired place, and contribute to the recycling of rapidly increasing electric vehicle water batteries.

The invention discloses a power failure fault judgment method based on a line topological relation, belongs to the technical field of power failure fault judgment based on the line topological relation and aims to improve the power failure fault judgment method based on the line topological relation. The technical scheme adopted for solving the technical problem is as follows: establishing a multi-source information fault line judgment system; establishing a power failure event information pool: after a to-be-judged power failure event is triggered, the specific control system sends event information to the information pool recorded by the power failure event database server through the monitoring server, and establishing a task of a to-be-judged power failure fault; and after the task is established, carrying out power failure fault judgment and analysis according to a trigger condition and an external interface, feeding back power failure information to a fault analysis server by a specific control system, and enabling the fault analysis server to generate a power failure fault judgment and analysis result and send the result to an information pool of a database server to perfect power failure event information. The method is applied to power grid power failure fault judgment places.

The invention discloses a movable power van which comprises a cabinet body. A partition plate is arranged in the middle inside the cabinet body. The upper surface of the partition plate and the bottomface inside the cabinet body are each provided with two positioning protrusions. A rechargeable battery is arranged between the two positioning protrusions at the upper surface of the partition plate, and a rechargeable battery is arranged between the two positioning protrusions at the bottom face inside the cabinet body. The outer surface of the cabinet body is provided with a power interface and a charging interface. According to the movable power van, due to cooperative use of the cabinet body, the rechargeable batteries, the power interface, the charging interface and fixing legs, cameras, WIFI, traffic island server automatic lifting lever systems and the like in ports can be rapidly powered on, and the movable power van has the advantages of being stable in performance, long in endurance time and convenient to move.

The invention discloses a lightning stroke line breaking alarm device for a 10-kV overhead line based on an acceleration sensor. The line breaking alarm device involves that the acceleration sensor isarranged on the overhead line, an output end of the acceleration sensor is connected to a control end of an alarm unit, and the acceleration sensor is used for detecting acceleration information during the state change of the overhead line; a detection end of a control unit is connected to the output end of the acceleration sensor, and the control unit is configured to generate and send a line breaking signal when determining that the acceleration information is greater than or equal to a preset threshold; a receiving end of the alarm unit is connected to an output end of the control unit, and the alarm unit is used for generating alarm information according to the line breaking signal. The lightning stroke line breaking alarm device for the 10-kV overhead line based on the acceleration sensor has the advantages that the reliability and accuracy of the lightning stroke line breaking detection are improved, the possibility of false alarm caused by over voltage is reduced, the maintenance efficiency of lightning stroke line breaking is improved, and the emergency maintenance and rapid recovery of power supply are facilitated.

The invention discloses a power device, which comprises a power supply module and a charging module, wherein the power supply module comprises a first to an N-th battery packs which are connected with each other in parallel, cathodes from the first to the N-th battery packs are connected to be used as a power supply cathode of the power device, anodes from the first to the N-th battery packs are connected to be used as power supply anode of the power device, the N is a positive integer which is not smaller than 1, the charging module comprises a charging control circuit group, the charging circuit group comprises N control circuits which are respectively connected with the first to the N battery packs, and are used to respectively control the size of charging current of the first to the N-th battery packs, the output ends of the control circuits, the cathodes and the anodes of the battery packs are respectively connected to form a charging circuit, and input ends of the control circuits are connected with a charging interface of the power device. The power device uses the control circuits in a charging control circuit group to independently changer for each circuit of battery packs, can achieve rapid power supply for each circuit of battery packs, and can improve charging safety.

A multi-stage power supply recovery method for an active power distribution network comprising a flexible multi-state switch comprises the following steps: inputting active power distribution networkinformation according to a selected active power distribution network; according to active power distribution network information, creating an active power distribution network multi-stage power supply recovery model containing the flexible multi-state switch by comprising steps of setting the minimum sum of unrecovered load power, switching action times and network operation loss of an active power distribution network as an objective function; respectively considering an activation state constraint, a radial topology constraint, an activation sequence constraint, an action time mapping constraint, a flexible multi-state switch flexible power supply recovery strategy, an active power distribution network operation constraint and a load and distributed power supply recovery constraint; andsolving the model by adopting a second-order cone programming method, and outputting a solving result. The calculation burden is effectively reduced, the active power distribution network multi-stagepower supply recovery strategy considering the cooperation of the flexible multi-state switch control mode and the traditional switch action sequence is obtained, and the operability of the power supply recovery strategy is improved.