Abstract: The invention discloses a control method and system for improving a transient stability area of a grid-connected inverter. It includes performing park coordinate transformation on a three-phase voltage and a three-phase output current of a connection point of a grid-connected inverter to obtain an actual voltage input value and an actual current input value required for current control; obtaining the grid-connected voltage phase through phase-locked loop processing; generating, by the power control module, the current command value required by the current control module; using the sliding mode current control method, by the current control module, to generate a dq voltage signal, and obtaining PWM modulated voltage control signals through inverse park transformation; using a LCL filter to filter out high-order harmonics to achieve grid-connected control.

Abstract: Disclosed is an environment active sensing-type automatic parking system in a parking lot, including a vehicle information acquisition and identification module, a multi-sensor positioning module, a building information model module, a classification processing module, path planning and navigation module, a parking space state judgment module, a two-flywheel steering device and a mechanical power device. A QR code, a mechanical power device, and a two-flywheel steering device are mounted onto a vehicle, the QR code is identified by using a camera in the parking lot to achieve continuous positioning, an optimal path is planned according to vehicle distribution information in the current parking lot, and the driving speed and driving direction of the vehicle are controlled by remotely controlling the mechanical power device in the vehicle, so as to achieve automatic parking in the parking lot.