85 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 discloses a photovoltaic network construction control method and device based on voltage amplitude self-adaptive regulation and control. The method comprises the following steps: acquiring an intermediate-stage direct-current voltage in a working process of a photovoltaic panel; the DC / DC module operates in an MPPT tracking mode when the intermediate-stage DC voltage is lower than a set threshold value, and is switched to a constant-voltage mode when the intermediate-stage DC voltage is lower than the set threshold value to limit photovoltaic output; and the DC / AC module adopts a modification droop control method based on voltage amplitude self-adaptive regulation and control, an amplitude control item is introduced in amplitude control, and the output amplitude of the DC / AC module is adjusted in real time according to the intermediate-stage DC voltage deviation, so that the photovoltaic converter can adaptively adjust the output voltage amplitude. According to the invention, when the photovoltaic output of the photovoltaic converter is sufficient, the AC voltage is independently constructed, and the network construction control is realized; and when the photovoltaic output is insufficient and cannot meet the load demand, the photovoltaic converter adaptively adjusts the amplitude of the output voltage and stabilizes the frequency of the output voltage at the same time.

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.

The invention relates to a low-loss aging test system based on single-phase input dynamic direct current feedback and a control method. The low-loss aging test system comprises an aging test system and a tested unit, the aging test system comprises K1 energy conversion equipment, K2 energy conversion equipment and K3 energy conversion equipment which are connected through a high-voltage direct-current bus. The tested unit comprises a tested power supply, a power supply input end and a power supply output end; the input end of the power supply is connected with the output end of the K2 and is used for receiving the alternating current output by the DC-AC module, and the output end of the power supply is connected with the input end of the K3 and is used for transmitting the direct current after test processing to the DC-DC boosting module; and a closed-loop energy circulation link is formed between the aging test system and the tested unit. The device has the advantages of being high in power factor, low in harmonic content and high in energy conversion efficiency, cyclic utilization of energy is achieved, energy loss in the testing process is effectively reduced, the energy utilization efficiency is improved, the problem that the energy utilization rate of an alternating current feedback mode is low is solved, and remarkable economic benefits and environmental benefits are achieved.

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 present invention discloses a grid voltage regulator and a method for controlling high and low voltages in a grid, and relates to the field of power supply. The grid voltage regulator includes a high-frequency isolation transformer, two AC / AC modules, a first filter inductor, a second filter inductor, an AC grid equivalent power supply, a grid capacitor, and a load; wherein the first AC / AC module includes four switching tubes and the second AC / AC module includes four capacitors respectively. The primary side voltage Vp of the high-frequency isolation transformer is controlled by the first AC / AC module; the secondary side voltage Vq is obtained by induction of the secondary side of the high-frequency isolation transformer, and then the voltage Vs of the grid capacitor is controlled by the second AC / AC module; by superimposing the voltage Vs and the grid voltage Vg, the high and low voltage control of the grid voltage Vg can be achieved. The present invention adopts an AC to AC energy one-stage conversion architecture to achieve the control of voltage too low and too high problems, which greatly reduces the cost while improving work efficiency and reducing the size of the device.

The present invention discloses a black start method, device and equipment for offshore wind power based on self-provided power sources. Based on an offshore wind power DC transmission system including a first offshore wind farm, a second offshore wind farm, 4 first inverters, 2 second inverters, a back-to-back AC / DC / AC module, a first diode converter valve, a second diode converter valve, a diesel generator system, an energy storage system, an onshore converter valve, an onshore transformer and an onshore power grid, corresponding first switches, second switches and third switches are configured. A small-capacity inverter is used in cooperation with a certain switching sequence to achieve black start at the sending end and power balance, maintaining the technical advantages of the diode solution in terms of low cost and small volume, and solving the technical problem that the existing offshore wind power black start methods reduce the technical advantages of the diode solution in terms of small volume and low cost.

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 relates to the technical field of power primary frequency modulation, in particular to a primary frequency modulation control device based on an Ethernet bus, which comprises a switch module, a CPU (central processing unit) module, a digital output (DO) module, a digital input (DI) module, a 4-20mA output (AO) module, a 4-20mA acquisition AI module, an analog acquisition AC module, a GOOSE signal communication module, a power module and a touch LCD (liquid crystal display) module. All the modules are powered by 24V and 5V power buses, data communication is carried out by using an Ethernet bus, and time synchronization adopts a PPS time synchronization bus; according to the utility model, the internal backplane bus is adopted, the independent switch module is added for data interaction of the Ethernet, all MCU Ethernet adopts a W5500 extended Ethernet, and an FPGA is not used, so that the universality and expansibility are improved, the cost is reduced, the reliability of data transmission is improved, and very important significance is provided for engineering field use.

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 the technical field of power supply, in particular to an oil-electricity hybrid power supply system, which comprises a generator set and an energy storage power supply, and the generator set and the energy storage power supply can independently supply power to a load and can also be connected in parallel to jointly supply power to the load. The energy storage power supply can be charged through the alternating current output end of the generator set, or can be charged through commercial power, alternating current charging equipment and direct current. The energy storage power supply comprises a battery pack, a bidirectional DC-DC module and a bidirectional DC-AC module which are electrically connected in sequence, the bidirectional DC-AC module is connected with an alternating current input / output end, and the alternating current output end of the generator set can be electrically connected with the alternating current input / output end of the energy storage power supply. The multi-scene power utilization requirement can be met, the use is flexible, and the applicability is wider.

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 present invention discloses a bidirectional energy storage inverter, which relates to the technical field of power conversion. It includes an intelligent control module for receiving signals and module control; a charge and discharge control module for controlling the charge and discharge of an energy storage module; an inverter control module for selecting the path state connected to an inverter module and transmitting signals; an inverter module for performing inversion and rectification processing and controlling a power transistor circuit to access a full-bridge inverter circuit; a switching control module for controlling the connection between the inverter module and an AC module; an AC module for outputting and providing alternating current; and an output detection module for voltage detection. The bidirectional energy storage inverter of the present invention completes inversion and rectification processing through the inverter module, cooperates with the charge and discharge control module to control the energy storage and discharge of the energy storage module, controls the inverter control module to connect the power transistor circuit to the full-bridge inverter circuit according to the signals detected by the output detection module, and the switching control module controls the output path so as to maintain the operation of the inverter module.

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.

An outflow test module based on internal insulation direct-insertion type plastic package single tubes comprises a heat dissipation bottom plate, a plurality of plastic package single tubes arranged on the heat dissipation bottom plate, a PCB arranged on one side of the plastic package single tubes, and a plurality of overcurrent copper bar assemblies arranged on the two sides of the PCB. The side, facing the plastic package single tubes, of the heat dissipation bottom plate is provided with bosses corresponding to the plastic package single tubes in a protruding mode, the plastic package single tubes are arranged on the bosses in a welded mode, and the PCB is provided with a plurality of holes located among the components. At least one U-shaped groove is formed in the edge position of the PCB and located at the interval of the three-phase alternating current modules. According to the outflow test module, the distance between the plastic package single tube and the heat dissipation bottom plate is controlled by changing the height of the boss, so that the electrical gap is controlled, and the test requirements that the voltage grade of the single tube module is 650-1700 V and the output current is 100-300 A can be met by matching with the overcurrent copper bar assembly.

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.

The invention provides high-protection-level energy storage converter equipment. The high-protection-level energy storage converter equipment comprises a cabinet body composed of an open cabin and a sealed cabin. A water-cooling heat dissipation module and an outer water-cooling pipeline are arranged in the open cabin; the sealed cabin internally comprises a direct current module, a power module, an electric reactor, an alternating current module, a control panel group, a built-in heat exchanger and an inner water cooling pipeline which are connected; the power module is arranged on a water cooling plate, and the water cooling plate and the built-in heat exchanger are connected with an outer water cooling pipeline of the open cabin through an inner water cooling pipeline to complete water cooling heat exchange; the front surface of the sealed cabin further comprises an auxiliary cabinet door and a main cabinet door which are mutually matched left and right, and a sealing rubber strip is arranged at the joint of the main cabinet door and the auxiliary cabinet door; and water retaining strips are arranged at the joints of the sealed cabin top cover, the auxiliary cabinet door and the main cabinet door. According to the invention, the heat exchange requirements of the power module, internal heat dissipation and the reactor can be effectively met. And the IP protection grade of the whole cabinet body is integrally improved.