3results about How to "Suppresses inrush current" patented technology

This application discloses a method, apparatus, and electronic device for suppressing transformer inrush current. The method includes: outputting a pre-charge voltage at the first port of an inverter; acquiring the inverter's voltage signal and determining the zero-crossing point of the pre-charge voltage based on the voltage signal; determining a first closing time based on the zero-crossing point of the pre-charge voltage; determining a second closing time based on the first closing time and a target delay time; the target delay time being the time from when a closing command is issued by the inverter to when it is responded to by a relay; and issuing a closing command to the relay at the second closing time to control the relay contacts to close, thereby suppressing transformer inrush current. The method provided in this application can efficiently suppress transformer inrush current, which helps improve the stability of the energy storage inverter control system; at the same time, it eliminates the need to add additional hardware circuits or devices to the energy storage inverter control system, reducing the cost of suppressing transformer inrush current.

This invention provides an inverter device that, in a superimposed control method for suppressing inrush current flowing to the main transformer by superimposedly applying voltages from an external power source when the main power supply is turned on, can suppress inrush current from various external power sources. The inverter device generates a predetermined three-phase variable frequency voltage from a three-phase AC power source and includes: a main transformer that applies a first voltage from an external three-phase AC power source to the three-phase primary winding on the primary side and obtains a predetermined voltage from the three-phase secondary winding on the secondary side; and an inverter body comprising multiple inverter units connected to the three-phase secondary winding of the main transformer. The main transformer has a third three-phase winding on the primary side such that when the first voltage is applied to the three-phase primary winding, a second voltage lower than the first voltage is superimposedly applied to the primary side. The main transformer has connection terminals at both ends of each phase winding of the third three-phase winding.

This application provides a method for suppressing inrush current, a parallel system, electronic equipment, and a readable storage medium. The method includes: through a master-slave cooperative control mechanism, the master calculates the global closing point and broadcasts a synchronization command; the parallel system state switches from a conventional parallel operation state to a master-slave cooperative switching state; each slave performs delay compensation based on its own relay parameters; and finally, the EPS relays of multiple machines achieve synchronous closing at the peak point of the inverter output voltage, thereby suppressing the inrush current caused by the EPS port transformer and the circulating current between the inverters. This application's method breaks through the traditional parallel system's synchronous command execution mode, establishing a target synchronization and distributed triggering mode. This application ensures that all EPS relay contacts can achieve high-precision synchronous closing at the voltage peak point.