Sungrow Power Supply Patente

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A power conversion system-based charging method and apparatus, and a power conversion system. A soft-start circuit (301) connected in parallel with a first branch (302) can be used to perform voltage compensation on a bus by means of a direct current side. A voltage of the first branch (302) of a positive electrode of a battery is acquired as a first voltage, a voltage of a second branch (303) of the positive electrode of the battery is acquired as a second voltage, a difference between said voltages is calculated, the value of the first voltage is compared with the value of the second voltage when the difference is greater than a preset voltage value, the bus undergoes voltage compensation by using the direct current side so that the voltage of the bus is equal to the smaller voltage value, and then the bus is charged on the basis of the larger voltage value. A power conversion system is compatible with a multi-branch system and is used for a multi-branch topology, and a voltage compensation method of the power conversion system is not limited by the incapability to perform voltage compensation due to a low voltage of the branch where the soft-start circuit (301), thereby reducing the cost and improving the efficiency without affecting the system function, and greatly improving the utilization rate.

A circuit for protecting a micro inverter and a circuit system having micro inverter topology. The circuit comprises a current sampling module, a hardware adjusting module, and a shutdown module that are sequentially connected. The current sampling module is configured to collect a first current signal in a bridge arm, in which a switch transistor is located, in secondary-side bridge arm circuitry comprising switch transistors. The hardware adjusting module is configured to receive the first current signal and a reference current signal and output an overcurrent indicating signal for the first current signal. The shutdown module is configured to receive the overcurrent indicating signal and a grid-polarity signal and output a shutdown control signal for the switch transistors, to enable secondary-side driving circuitry to shut down the switch transistors in the secondary-side bridge arm circuitry. Operating states of the switch transistors can be adjusted accurately and timely when overcurrent occurs in the secondary-side bridge arm circuitry, and the switch transistors are reliably protected from damage.

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Disclosed in the present application are a cooling system and a related apparatus. The cooling system is used for a power conversion apparatus, the power conversion apparatus comprises a protective cavity and a device to be cooled in the protective cavity, and the cooling system comprises a cold plate, wherein the cold plate is attached to a cavity wall of the protective cavity; or the protective cavity is provided with an opening, and the cold plate is connected to the opening and is in direct or indirect contact with the device to be cooled. In the cooling system provided in the present application, the cold plate of the cooling system is attached to the cavity wall of the protective cavity, and heat dissipation of the device to be cooled in the protective cavity is realized by means of cooling the cavity wall; or the protective cavity is provided with the opening, and the cold plate is in direct or indirect contact with the device to be cooled by means of the opening, such that the device to be cooled is cooled by means of the cold plate. Compared with an air cooling method, a heat dissipation capability of the power conversion apparatus is improved by using an active heat dissipation method of cooling the device to be cooled by means of the cold plate in the present application.

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Provided are a battery pack, a battery cluster, and an energy storage system device. The battery pack specifically comprises: at least one battery cell (10) and at least one acquisition connector, wherein the battery cell (10) is connected between two electrodes of the battery pack, and the battery cell (10) is connected to the acquisition connector; the outside of a charged part in the battery pack is covered with a first insulating material (01); and the charged part in the battery pack comprises an electrode of the battery cell (10). The outside of the charged part in the battery pack is covered with the first insulating material (01), and the first insulating material can form an insulating layer between the charged part and an environment, i.e., the charged part is isolated from the environment, so that the battery pack will not be affected by condensation, thus reducing the possibility of electrical safety accidents in the battery pack, thereby improving the electrical safety performance of the battery pack.

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A sealing structure and an energy storage module. The sealing structure comprises a bottom supporting plate and a covering assembly, wherein at least one module unit body is mounted on the bottom supporting plate; the covering assembly has a covering inner cavity, which adapts to the module unit body in terms of shape and size, and a covering opening, which is in sealing fit with the bottom supporting plate, and the covering assembly is provided with a wiring slot for allowing an output member of the module unit body to lead out a wire; and the part of the output member passing through the wiring slot is filled and sealed in the wiring slot by means of a filling-sealing adhesive. By means of making improvements to the design for a casing of each module unit body of the energy storage module, a sealing effect which is required for the electrical safety of the module unit body can be achieved by the casing of the module unit body, and the overall structure of the energy storage module is simplified, such that the machining and assembly are more convenient, and the production cost is also reduced. When an electronic control assembly connected to the module unit body is maintained, the sealing performance of the module unit body itself is not affected, such that maintenance operations are safer and more convenient.

An energy storage module and a sealing structure thereof The sealing structure comprises a bottom plate (1), an enclosure portion (2) and a potting adhesive (4), wherein the bottom of the enclosure portion (2) is connected to the bottom plate (1) in a sealed manner; a module unit body (3) is loaded in an enclosed space of the enclosure portion (2); and the potting adhesive (4) is potted into an opening in the top of the enclosure portion (2) and covers the top of the module unit body (3). By means of designing the sealing structure of the energy storage module in the above structural form, the potting adhesive (4) can ensure a sealing effect on the module unit body (3); in addition, when the module unit body (3) loaded in the enclosure portion (2) has a fault and generates a high-temperature and high-pressure gas, after encountering the high-temperature and high-pressure gas, the potting adhesive (4) is heated and melts into a liquid state, and the high-temperature and high-pressure gas can escape from the liquid potting adhesive (4), thereby realizing the aim of pressure relief, such that the provisions of a box cover and a pressure relief valve are omitted, thus greatly saving on the cost.

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Provided in the present application are a method and apparatus for power line carrier communication, and a photovoltaic system. The method comprises: a master node sending at least one debugging frame to at least one slave node on the basis of a target power line branch; the master node receiving at least one response frame corresponding to each debugging frame in the at least one debugging frame; the master node determining a signal strength corresponding to each response frame in the at least one response frame corresponding to each debugging frame; the master node determining a target address meeting a set signal strength condition from addresses of slave nodes corresponding to all response frames on the basis of the signal strength corresponding to each response frame; and the master node establishing a topological relationship between the target power line branch and the target address.

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