53 results about "AC module" patented technology

The invention relates to the field of new energy charging, in particular to a main circuit topology based on an integrated over-charging device for light storage and charging and a control method. The system is composed of the following parts: an ACDC module, a charging DCDC module, a photovoltaic DCDC module, a DCAC module and a battery, wherein the battery is used for storing redundant electric quantity and discharging the electric quantity to a charging pile for use; the invention provides a main circuit topology based on direct-current coupling, a very simple network architecture and an AI intelligent algorithm are fused to greatly expand the application scene of optical storage and charging in the overcharging field, meanwhile, a dynamic intelligent algorithm is combined, the dependence of an overcharging station on a power grid is reduced, and through an economic operation strategy, the system is more reliable and reliable. Efficient collaboration and accurate distribution of energy of all links of light, storage, charging and utilization are achieved, and the operation capacity and economical efficiency of a charging station are improved.

The invention, which relates to the technical field of direct-current power transmission, discloses a co-offshore medium-high-frequency alternating-current offshore wind power full-direct-current collection system comprising: an offshore wind turbine module, which is used for obtaining offshore medium-voltage direct-current electric energy; the multi-port direct-current voltage transformation module is used for converting the offshore medium-voltage direct-current electric energy into offshore high-voltage direct-current electric energy; the direct-current submarine cable module is used for gathering the offshore high-voltage direct-current electric energy, acquiring the gathered offshore high-voltage direct-current electric energy and transmitting the gathered offshore high-voltage direct-current electric energy to the shore converter station module; the shore converter station module is used for acquiring shore high-voltage alternating-current electric energy according to the collected offshore high-voltage direct-current electric energy; the onshore alternating current module is used for receiving the onshore high-voltage alternating current electric energy and achieving full-direct-current collection of offshore wind power. By improving the medium voltage-high voltage direct current transformer topological structure and the control method, efficient and economical electric energy transmission is realized, the construction economy and the engineering application value of an open-sea wind power collection system are improved, and the average price and low price requirements of marketization development are met.

The embodiment of the invention discloses a power control method of a parallel energy storage system and the parallel energy storage system. The method comprises the following steps: an energy storage converter host receives a total battery power scheduling instruction, collects battery side actual power reported by each energy storage converter slave and calculates total actual power; generating a corrected total power instruction based on the scheduling instruction and the total actual power, and distributing the corrected total power instruction to each energy storage converter slave; and each energy storage converter slave generates and executes a power execution instruction of the DC / AC module based on the received power reference instruction and the actual power collected by the energy storage converter slave. The battery side total power is ensured to accurately track the scheduling instruction through the system-level closed-loop control, the efficiency conversion error is eliminated through the single-machine-level closed-loop control, the high-precision control of the battery power is realized, the accurate scheduling of the system total power can still be ensured even under the condition that the single-machine power is limited, and the control precision and reliability of the parallel energy storage system are improved.

The invention relates to the technical field of power supplies, and discloses a bidirectional uninterruptible power supply system with a bus neutral-point balance circuit and a control method, the bidirectional uninterruptible power supply system comprises a static bypass unit, a power conversion unit and a controller, a first end of the static bypass unit is connected to an external power grid, and a second end is used as a power grid output end; the first end of the power conversion unit is connected with the energy storage device, the second end of the power conversion unit is connected with the power grid output end of the static bypass unit to form an alternating-current connecting end connected with a load, the power conversion unit comprises a three-level bidirectional DC / AC module, a direct-current bus and a bus neutral-point balance circuit, and the bus neutral-point balance circuit is coupled with the direct-current bus. The direct-current bus comprises a first capacitor and a second capacitor; the controller is configured to control the operation logic of the bus neutral-point balancing circuit according to the voltage difference between the first capacitor and the second capacitor so as to clamp the neutral-point potential of the DC bus. The architecture topology is simple, and the operation stability and the power supply reliability under multiple working conditions are improved.

The invention discloses a light-hydrogen bilateral collaborative self-adaptive network construction control method, which is applied to a light-hydrogen bilateral coupling system, the system comprises a photovoltaic power generation unit and an electrolytic hydrogen production unit which are directly connected through an alternating current bus, the photovoltaic power generation unit comprises a photovoltaic panel, a DC / DC module and a DC / AC module, and the electrolytic hydrogen production unit comprises an AC / DC module, a DC / DC module and an electrolytic cell; the method adopts a maximum power point tracking algorithm and voltage threshold control to control a DC / DC module on a photovoltaic side, adopts voltage threshold control to control a DC / DC module on a hydrogen side, and adopts an alternating current droop control method introducing a phase control mechanism to control a DC / AC module or an AC / DC module. Therefore, the output frequency, the voltage and the phase of the corresponding photovoltaic power generation unit or the electrolytic hydrogen production unit are regulated and controlled, and dynamic power balance is ensured to be formed between the photovoltaic output and the electrolytic load. Two-way adjustment can be carried out, and stable operation of the system is ensured.

A photovoltaic energy storage and bidirectional inversion conversion system, method, device and medium relate to the photovoltaic inverter field, and the system comprises a photovoltaic inverter, a photovoltaic input DC-DC module, a DC-DC output module, a battery bidirectional DC-DC module, a bidirectional DC-AC module and a DC bus module; the first end of the photovoltaic input DC-DC module is connected with the photovoltaic panel, and the second end of the photovoltaic input DC-DC module is connected with the DC bus module; the first end of the DC-DC output module is connected with the DC bus module, and the second end of the DC-DC output module is connected with the photovoltaic inverter; the first end of the battery bidirectional DC-DC module is connected with the DC bus module, and the second end is connected with the battery; the first end of the bidirectional DC-AC module is connected with the DC bus module, the second end is connected with the load, and the third end is connected with the photovoltaic inverter. According to the application, a direct-current side transformation path is adopted, and a mode relying on alternating-current side large-scale line transformation is replaced through collaborative design of all modules.

The utility model discloses a multi-pack parallel eVTOL battery pack current acquisition system, which belongs to the technical field of battery pack current acquisition and comprises a battery pack module and a PDU module, the battery pack module is connected with the PDU module, the PDU module is connected with a DC-to-AC module, and the DC-to-AC module is connected with a load. Through the mode, the current sensor A1 is arranged in each battery pack of the plurality of battery packs connected in parallel, and the current sensor A0 is arranged in the PDU module, so that the current values of the plurality of battery packs can still be obtained even if the current sensor A1 in a certain battery pack fails.

This invention discloses a novel AC / DC hybrid power electronic transformer, comprising a transformer housing, a power module housing, and an auxiliary circuit housing. The transformer housing houses transformer windings, a current transformer, and a BCT terminal box. The auxiliary circuit housing includes a power distribution unit, a lightning protection unit, a bypass protection unit, and a maintenance component unit. The power module housing includes an AC / DC module and a DC / AC module. The transformer boasts a compact overall design, making it more suitable for dual-pole cross-arm installation in substations, reducing construction complexity. In AC / DC hybrid mode, it achieves flexible power coordination between the AC and DC grids, while meeting output voltage compliance requirements under varying input voltage conditions and enabling continuous online regulation.

The application provides a power supply control circuit, a transformer area voltage control system and method, comprising: an AC-DC module, an input end of which is connected with an AC power supply on a power supply side, and an output end of which is connected with a DC bus; a DC-AC module, an input end of which is connected with the DC bus, and an output end of which is connected with a stable AC power supply on a user side; a first bidirectional DC conversion module, a first end of which is connected with the DC bus, and a second end of which is connected with a first battery; a new energy power generation module, an output end of which is connected with the second end of the first bidirectional DC conversion module, and which is used for generating electric energy and adjusting power generation output power; a second bidirectional DC conversion module, a first end of which is connected with the DC bus, and a second end of which is connected with a second battery; and a control module, which controls each bidirectional DC conversion module. The application can obtain a stable AC power supply on the user side, can normally work even if the voltage on the input side is too low, has low demand for power grid power, and fully utilizes new energy to improve environmental protection, economy and efficiency.

The utility model discloses a ground wire pulling-free modularized power supply and a computer case, which comprise a rear side plate, the lower end of the rear side plate is connected with a bottom plate which extends forwards, the rear side plate is provided with a first mounting through hole and a second mounting through hole which are arranged at an interval up and down, and the front side surface of the rear side plate is connected with an internal thread column which extends forwards; a threaded connector is formed in the front end of the internal threaded column; the PCB is transversely arranged at the top of the bottom plate; the AC module comprises a male seat, an I / O switch, an AC board and a grounding screw; the male seat and the I / O switch are fixed on the AC board, pins of the male seat and the I / O switch are electrically connected with the AC board respectively, a locking through hole extending front and back is formed in the AC board, and a ground wire pin of the male seat is connected to the position where the locking through hole is located through a circuit on the AC board; the AC module is installed on the rear side plate from front to back, the male seat and the I / O switch are arranged at the rear ends of the corresponding first installation through hole and the second installation through hole in an exposed mode, the locking through hole directly faces the front side of the threaded connection port, and pulling-free ground wire is achieved.

The utility model relates to an off-grid inverter, which belongs to the technical field of inversion devices and comprises a casing and a main board arranged on the bottom wall of the casing, the main board is sequentially provided with a PV module, an inversion module, a DC-DC module and a battery module along the transverse direction, the front side of the PV module is provided with an AC module, the main board is provided with a copper bar jumper wire and a copper sheet, and the DC-DC module is connected with the battery module. The mainboard is connected with the PV module and the AC module through copper bar jumper wires, and the mainboard is connected with the battery module through a copper sheet. Wherein the PV module is a photovoltaic input module, the DC-DC module is a DC transformation module, and the AC module is an AC output module. According to the utility model, the PV module, the inversion module, the DC-DC module and the battery module are sequentially arranged along the transverse direction of the mainboard, the mainboard is connected with the PV module and the AC module through the copper bar jumper wire and is connected with the battery module through the copper sheet, and the inverter adopts a wireless design, has the advantages of compact structure, simplicity, order and convenience in wiring, and can improve the production efficiency.

The utility model discloses an alternating current and direct current charging socket with overlarge current, which relates to the field of alternating current and direct current charging sockets and comprises a panel, a direct current module and an alternating current module, the direct current module and the alternating current module are mounted on the panel, an aluminum row assembly is arranged on the direct current module, and the direct current module comprises a direct current charging socket mounting plate and an aluminum row male plug. A mounting space is formed between the direct current charging socket mounting plate and the panel, the aluminum bar male plug is arranged in the mounting space, the aluminum bar assembly comprises an aluminum bar mounting shell and aluminum bars, the aluminum bar mounting shell is fixed on the direct current charging socket mounting plate, one end of the aluminum bar mounting shell is provided with a plurality of aluminum bars, and the aluminum bars are fixed on the aluminum bar mounting shell. The aluminum row is longitudinally installed and connected with the aluminum row male plug, the panel is provided with an aluminum row female socket, the aluminum row female socket is matched with the aluminum row male plug in an inserted mode, a new energy automobile is charged through power transmission of the aluminum row, larger current can pass through, and the charging speed is improved.

The present application belongs to the technical field of power supply for large-capacity high-frequency transformer testing, and particularly relates to an energy feedback large-capacity high-frequency transformer testing power supply topology and control method, aiming to solve the problem of resource waste caused by large power consumption in the temperature field testing of large-capacity high-frequency transformers in the prior art. The present application comprises: a three-phase multi-winding transformer, including one primary three-phase winding and M+N secondary three-phase windings; M+N AC / AC modules corresponding to the secondary three-phase windings; a first resonant capacitor connected in series between the first AC / AC module and the high-voltage side of the large-capacity high-frequency transformer to be tested; a second resonant capacitor connected in series between the M+1th AC / AC module and the low-voltage side of the large-capacity high-frequency transformer to be tested; and a first bypass switch and a second bypass switch connected in parallel with the first resonant capacitor and the second resonant capacitor, respectively. The present application saves electric energy and occupies less resources, has a modular structure, a wide test voltage range, a low rated voltage of a single module, and strong reconfigurability.

The utility model discloses an AC / DC charging socket with a split slot terminal, which relates to the technical field of sockets and comprises a panel, a DC module and an AC module, the DC module and the AC module are mounted on the panel, the AC module comprises an AC mounting seat and a split slot terminal arranged in the AC mounting seat, and the split slot terminal comprises a copper pipe. The copper pipe is arranged in a hollow mode, a plurality of inserting grooves are formed in the inner wall of one end of the copper pipe, the inserting grooves are evenly distributed in the circumferential direction of the copper pipe, a female terminal is arranged in the panel, protrusions matched with the inserting grooves are fixed to the outer wall of the female terminal, a traditional terminal is replaced by a split-groove terminal, the inserting grooves are formed in the inner wall of the split-groove terminal, and the outer wall of the split-groove terminal is fixedly provided with protrusions matched with the inserting grooves. After the split groove terminal and the female terminal are plugged, the projection of the female terminal is matched in the plugging groove, thereby improving the connection strength of the female terminal and the split groove terminal, enabling the connection between the cable and the socket to be more stable, and improving the anti-vibration performance.

The application relates to the technical field of distributed optical fiber sensing systems, in particular to a high-gain low-noise distributed optical fiber vibration sensing system signal processing device and method, which is provided with a 2*2 coupler, two PIN photoelectric diodes, two AC filtering circuits, two transimpedance amplification circuits, a signal difference unit and a signal demodulation unit, the two transimpedance amplifiers realize conversion of a current signal into a voltage signal; the input end of the transimpedance amplifier is connected with an AC module, and the output end is connected with the signal difference unit; compared with the prior art, the two transimpedance outputs are combined with the AC filtering circuit, so that the range of the electric signal obtained through photoelectric conversion is increased, the input optical signal is fully utilized, the output signal is increased, the signal-to-noise ratio of the system is significantly improved, and the system measurement capability is enhanced.

The utility model discloses an overlarge current charging socket with a split slot terminal, which relates to the charging socket field, and comprises a panel and a direct current module and an alternating current module which are installed on the panel, the alternating current module comprises an alternating current installation seat and a split slot terminal arranged in the alternating current installation seat, the split slot terminal comprises a copper pipe, the copper pipe is arranged in a hollow mode, and the split slot terminal is arranged in the copper pipe. The inner wall of one end of the copper pipe is provided with a plurality of plugging grooves, so that the charging connection is more stable, the anti-seismic performance is improved, the direct current module comprises a direct current charging socket mounting plate and an aluminum row male plug, a mounting space is formed between the direct current charging socket mounting plate and the panel, and the aluminum row male plug is arranged in the mounting space. The direct current charging socket mounting plate is provided with an aluminum bar assembly, the aluminum bar assembly comprises an aluminum bar mounting shell and aluminum bars, the aluminum bar mounting shell is fixed on the direct current charging socket mounting plate, one end of the aluminum bar mounting shell is provided with a plurality of aluminum bars, the aluminum bars are transversely mounted, and the aluminum bars are connected with aluminum bar male plugs, so that larger current can pass through, and the charging speed is improved.

The utility model discloses an all-in-one power distribution unit, which relates to the field of power distribution units and comprises a high-voltage power distribution system and an auxiliary power supply system. The high-voltage power distribution system shunts electric energy output by the high-voltage storage battery and configures the electric energy to the driving unit and the integrated power generation module; the auxiliary power supply system comprises an oil pump DC / AC module, an air pump DC / AC module, a low-voltage DC / DC module, a PTC heating module and a compressor control module, and electric energy of a high-voltage storage battery is distributed to an oil pump motor, an air pump motor, a low-voltage storage battery, low-voltage electric equipment for power supply, a PTC and a compressor through the modules. The all-in-one power distribution unit is used for electric energy distribution, and the working efficiency and reliability of an electrical system are improved.

The invention relates to a vehicle battery module including a power conversion device, and a three-phase vehicle battery system based on a plurality of vehicle battery modules. The vehicle battery module includes a battery, a DC / DC converter, and a three-phase AC unit for outputting a three-phase AC module voltage. Further, the three-phase vehicle battery system includes: a plurality of vehicle battery modules; the direct current system output end is used for connecting the direct current module output ends included in each of the plurality of vehicle battery modules in parallel; and a three-phase AC system output terminal for connecting the three-phase AC module output terminals included in each of the plurality of vehicle battery modules in series.

The utility model discloses a power unit and a converter device, the power unit comprises an AC module, a power module and an auxiliary capacitor module, the power module is connected with the AC module, the power module comprises an IGBT module and a first capacitor pool which are electrically connected with each other, and the auxiliary capacitor module is electrically connected with the first capacitor pool. The total capacitance value of the first capacitor pool is smaller than the total capacitance value of the auxiliary capacitor module. According to the technical scheme, stray inductance can be reduced, the voltage peak is prevented from being too high, and the voltage stabilizing function is achieved.

The utility model provides an energy storage device, which comprises a plurality of battery packs and a plurality of transmission circuits arranged correspondingly, each transmission circuit is provided with a voltage conversion module, and the battery packs are electrically connected with a direct current bus through the corresponding voltage conversion modules respectively; a shunt switch is arranged between the transmission circuits, when one transmission circuit is disconnected, the shunt switch is closed, direct current output by a battery pack on the other transmission circuit is shunted through the shunt switch, and one path of direct current flows through a voltage conversion module on the original transmission circuit to a direct current bus. And the other path passes through the closed shunt switch, flows through the voltage conversion module on the disconnected transmission circuit, is transmitted to the direct current bus, and is inverted by the DC / AC module to output alternating current. According to the technical scheme, the power output of the battery pack is shunted through the shunt switch and output to the plurality of voltage conversion modules for power allocation, and each voltage conversion module works with low power, so that the heating value of the voltage conversion modules is reduced, and the temperature rise of a parallel circuit of the battery pack is reduced.

The invention relates to a flexible power supply method and device, a computer device and a storage device. The method comprises the following steps: acquiring real-time energy of a photovoltaic module and real-time electric quantity of a battery module; under the first condition, the photovoltaic assembly is controlled to supply power to an external load and charge the battery assembly; under the second condition, the photovoltaic assembly and the battery assembly are controlled to supply power to the external load; and under the third condition, the one-way AC / DC module is controlled to be started, the output voltage of the one-way AC / DC module is gradually increased to a preset voltage threshold value, the output current of the two-way DC / DC module is gradually reduced until the battery assembly stops supplying power, and then the sine wave parameter output by the one-way DC / AC module is controlled to be the same as the sine wave parameter input into the one-way AC / DC module. And finally controlling the AC power supply to supply power to an external load. According to the flexible power supply method, the power generation assembly does not need to have the absorption capacity, it can be guaranteed that the external load is not powered off under various conditions, and the alternating-current power supply is softer when the power generation assembly is switched for power supply.

This invention discloses a DC / AC electronic control system and method for a hydraulically driven intelligent cover application system for molten iron cars. The electronic control system is simple and reasonable in design, adopting a DC / AC module and enabling remote or local operation via PLC, wireless AP, frequency converter, etc. It drives the on-board hydraulic actuator to automatically complete the lifting and lowering of the insulation cover of the molten iron car, and complete the work processes such as receiving or pouring molten iron, avoiding the operation of personnel in high-risk environments. At the same time, the electrical control system adopts VVVF-PLC control mode, driving the hydraulic station oil pump motor to provide hydraulic pressure (the pressure is provided by the accumulator before the pressure reaches the rated value). The corresponding solenoid valves of each oil cylinder control the hydraulic actuator to complete the corresponding action requirements. The built-in magnetic ring displacement sensors in each hydraulic actuator control the stroke and feedback, so that the electronic control system can complete the operation quickly, efficiently and accurately.

The utility model relates to the technical field of electronic equipment, in particular to an inverter with an alternating-current copper bar heat dissipation structure, which comprises a reactor and an alternating-current module, the reactor comprises a reactor module, and the alternating-current module comprises an alternating-current switch; the reactor module is connected with the alternating current switch through a first copper bar; and a radiator is arranged on the first copper bar. And the radiator is additionally arranged on the first copper bar, so that a better heat dissipation effect is achieved, and the risk of overheat burning can be effectively avoided. And the radiator is used for replacing the existing radiating mode of increasing the volume of a copper bar, so that the usage amount of copper is greatly saved, and the cost is reduced.

The invention discloses a communicable frequency converter which comprises a frequency converter body with an inner cavity of a hollow structure and a functional device arranged in the inner cavity of the frequency converter body, the functional device comprises an AC / DC module, a DC / AC module, a rectification module, a transformer assembly, a control unit and a filtering module, and the input end of the AC / DC module is connected with a three-phase AC power supply. The output end of the AC / DC module is connected with the DC / AC module; the device has the advantages of being small in size and light in weight, under the cooperation of the AC / DC module and the DC / AC module, three-phase 115V / 360Hz-720Hz three-phase four-wire alternating current generated by onboard equipment such as a generator can be converted into single-phase pure and stable 220V / 50Hz alternating current standard mains supply, high efficiency and output power are achieved, power can be directly supplied to ground standard equipment, and the device can be widely applied to the field of power supply. The power supply can be used as aviation ground support equipment, a green gallery bridge, airport field operation, airplane maintenance and test, and a vehicle-mounted mobile power supply.

The present invention belongs to the technical field of energy storage. Disclosed are a hybrid energy storage system and operating method applied to a stand-alone photovoltaic microgrid, which system and method can give full play to the advantages of the large-power charging and discharging of a supercapacitor, the rapid high-rate charging and discharging of a sodium-ion battery, and the long cycle performance, high safety and relatively large depth of discharging of an iron-chromium flow battery. The supercapacitor, the sodium-ion battery and the iron-chromium flow battery complement each other's advantages, improving the safety and the charging and discharging performance of a hybrid energy storage system, thus constructing the hybrid energy storage system. The hybrid energy storage system and operating method applied to a stand-alone photovoltaic microgrid involve a photovoltaic power generation module, a sodium-ion battery module, a supercapacitor module, an iron-chromium flow battery module, a DC-DC module, a DC-AC module, an electric load module and a hybrid battery management system, wherein a sodium-ion battery, a supercapacitor and an iron-chromium flow battery are each connected in parallel to the hybrid battery management system by means of the DC-DC module, and the photovoltaic power generation module is connected to the electric load module by means of the DC-DC module, a direct-current bus, the DC-AC module and an alternating-current bus.

The present invention relates to a vehicle battery module comprising a power conversion device and a three-phase vehicle battery system based on a plurality of vehicle battery modules. The vehicle battery module comprises a battery, a DC / DC converter, and a three-phase AC unit for outputting a three-phase AC module voltage. Furthermore, the three-phase vehicle battery system comprises: a plurality of vehicle battery modules; a DC system output terminal connecting the DC module output terminals contained in each of the plurality of vehicle battery modules in parallel; and a three-phase AC system output terminal connecting the three-phase AC module outputs for each phase contained in each of the plurality of vehicle battery modules in series.

1. The name of the design product: robot access controller module lower cover. 2. The use of the design product: used for the four-legged robot AC module lower cover. 3. The design points of the design product: in the shape of the product. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model aims at providing a wide frequency domain AC / AC power supply system which has simple structure, purification function for power grid and variable output frequency. The utility model system includes the electricity taking CT (2) which takes electricity from the power grid (1), and the AC / DC module (3), the DC / AC module (4) and the three-phase output end (5) are sequentially connected in the rear end of the electricity taking CT (2), the positive line and the negative line between the AC / DC module (3) and the DC / AC module (4) are connected with a plurality of support capacitors (6). The utility model is applied to the power grid technical field.

The invention provides a multi-port alternating current and direct current hybrid topological structure suitable for flexible interconnection of a low-voltage transformer area, which comprises an energy storage battery, an AC bus, a DC bus, alternating current and direct current ports and a controller, and is characterized in that the alternating current and direct current ports provide a plurality of ports which are respectively connected with the AC bus, the DC bus, an alternating current load, a direct current load and a power grid, and the alternating current and direct current ports communicate with the controller; the AC / DC port provides a plurality of power conversion modules and comprises a DC / DC module, a DC / AC module I and a DC / AC module II, the AC / DC port provides a port which is connected to an AC micro-grid and a DC micro-grid, supports access to various devices such as an AC / DC source, a load, an energy storage device and a power grid, and adapts to diversified application scenes; a hierarchical control strategy of local control and power supply control is combined, so that system coordination requirements can be balanced, communication links can be reduced, and centralized management of alternating-current and direct-current power supplies is realized; the AC / DC port is provided with a DC / AC module, a DC / DC module and an equalization module, bidirectional conversion of power is realized, and the equalization module can effectively maintain voltage balance between DC buses.

The invention relates to a flexible power supply method and device, a computer device and a storage device. The method comprises the following steps: acquiring real-time energy of a photovoltaic module and real-time electric quantity of a battery module; in the first case, the photovoltaic module is controlled to supply power to an external load and charge the battery module; in the second case, the photovoltaic module and the battery module are controlled to supply power to the external load; and in the third condition, the unidirectional AC / DC module is controlled to start, the output voltage of the unidirectional AC / DC module is gradually increased to a preset voltage threshold value, the output current of the unidirectional AC / DC module is gradually increased until the battery assembly stops supplying power, and the sine wave parameter output by the unidirectional DC / AC module is controlled to be the same as the sine wave parameter input into the unidirectional AC / DC module. And finally controlling the AC power supply to supply power to an external load. According to the flexible power supply method, the power generation assembly does not need to have the absorption capacity, it can be guaranteed that the external load is not powered off under various conditions, and the alternating-current power supply is softer when the power generation assembly is switched for power supply.