Abstract: The present invention discloses a dual meshing method and system for a transformer winding, comprising acquiring the working frequency of a target transformer, and carrying out a first meshing operation on the winding of the target transformer according to the working frequency with the combination of a first meshing strategy; carrying out a second meshing operation on the target transformer winding after the first meshing operation with the combination of a second meshing strategy; and acquiring the mesh size of the target transformer winding after the second meshing operation, and completing meshing on the target transformer according to the mesh size. By reasonably allocating the mesh sizes, the distribution of electromagnetic fields in the transformer winding can be accurately simulated, the consumption of calculation resources can be reduced on the promise of ensuing the accuracy, the simulation efficiency and the accuracy of the simulation result can be improved.

Abstract: In an energy storage system, a battery cluster is connected to a battery cluster control circuit, the battery cluster control circuit is connected to one end of a first power conversion circuit, the first power conversion circuit is configured to connect to a power grid or a load, and a first detection circuit is disposed between the first power conversion circuit and the power grid or the load. When the first detection circuit detects that a leakage current of the energy storage system is greater than a preset safety threshold, a controller controls the battery cluster control circuit and the first power conversion circuit to be disconnected. After controlling the battery cluster control circuit and the first power conversion circuit to be disconnected, the controller controls the battery cluster control circuit to be connected, and sends alarm information indicating that a leakage current fault occurs in the battery cluster.

Abstract: A misting fan includes a fan assembly including fan blades and a first electric motor for driving the fan blades; a support assembly supporting the fan assembly; a nozzle spraying a water mist; a second electric motor and a water pump, where the second electric motor drives the water pump to supply a water source to the nozzle; and a power supply assembly for supplying power to the first electric motor and the second electric motor, where the power supply assembly includes a first power interface and a second power interface, the first power interface is configured to be electrically connected to a battery pack, and the second power interface is configured to be electrically connected to an external power supply. The power supply assembly further includes a charging circuit, and the charging circuit charges the battery pack using the external power supply when a charging condition is satisfied.

Abstract: A power converter and a control method. When the power converter runs in the first mode, a peak current flowing through an inductor is higher, and a switching frequency of the switching component is lower; or when the power converter runs in the second mode, a peak current flowing through an inductor is lower, and a switching frequency of the switching component is higher. When an output power of the power converter is less than a first specified power, a current output by the power converter is small, and the power converter runs in the first mode; or when an output power of the power converter is greater than or equal to a first specified power, a current output by the power converter increases, and the power converter runs in the second mode.