Abstract: The application relates to a method and system for a pilot directional protection of LCC-HVDC lines based on virtual grounding resistance The method comprises: Obtaining a conduction state information of a converter and characteristic parameters of a converter circuit within one commutation period after a fault occurs; according to the conduction state information and characteristic parameters, determining characteristic frequency of the circuit; according to the characteristic frequency and characteristic parameters, determining a virtual grounding resistance; according to the virtual grounding resistance, determining fault areas.

Abstract: The invention relates to a fault transient features optimization method and system of AC/DC system based on dissipated energy, which belongs to the HVDC transmission technology and is used to solve the problem that the DC pulsed current is too high and the generator power angle swing of the AC system on the rectifier side is too large during the process of the HVDC transmission system restart on fault.

Abstract: The presently disclosed technology discloses an unmanned aerial vehicle control method and apparatus. A device displays a map. The device detects a first movement path on a touch-sensitive surface of the device. The device overlays a trajectory on the map in accordance with the first movement path. The device automatically generates a number of waypoints along the trajectory. and the device displays the waypoints on the trajectory and sends instructions to an unmanned vehicle in accordance with the trajectory and the waypoints. The unmanned vehicle moves in accordance with trajectory by executing the instructions.

Abstract: This application discloses a flight tag obtaining method, terminal, and server. A takeoff geographic location of a first unmanned aerial vehicle can be obtained when the first unmanned aerial vehicle takes off. The takeoff geographic location of the first unmanned aerial vehicle can then be sent to a server. A flight tag returned by the server can be obtained. The flight tag can indicate whether another aerial vehicle took off from the takeoff geographic location of the first unmanned aerial vehicle before the first unmanned aerial vehicle.

Abstract: A method for operating an aircraft is performed by a mobile terminal. The mobile terminal displays an aircraft operation interface on a touchscreen of the mobile terminal and monitors a touch control operation applied on the aircraft operation interface. After determining that the touch control operation is detected, the mobile terminal acquires sensor data from one or more sensors of the mobile terminal and obtains an aircraft operation command according to the sensor data. Finally, the mobile terminal sends the aircraft operation command to the aircraft that is wirelessly connected to the mobile terminal. The aircraft then performs a predefined operation according to the operation command.

Abstract: A multimedia synchronization method is performed by an aircraft that is wirelessly connected to a plurality of mobile terminals. After receiving a first authorized-user identifier sent by a first mobile terminal, the aircraft receives an aircraft operation command and a photographing command sent by the first mobile terminal. The aircraft performs aircraft flight control according to the aircraft operation command and collects multimedia data in a target photographing region according to the photographing command. Finally, the aircraft stores the multimedia data for which the first authorized-user identifier is used as an index identifier. The aircraft synchronizes the multimedia data to the first mobile terminal and a second mobile terminal that accesses the multimedia data.

Abstract: A method for operating an unmanned aerial vehicle (UAV) is performed by a mobile terminal. The mobile terminal displays an image transmission interface on a touchscreen of the mobile terminal, the image transmission interface including a picture taken by the UAV that is wirelessly connected to the mobile terminal. After detecting a touch control signal applied on the touchscreen, the mobile terminal acquires an operation gesture according to the touch control signal and generating a corresponding operation command according to the operation gesture and a current control mode of the image transmission interface. Finally, the mobile terminal sends the operation command to the UAV. The UAV then performs a predefined operation according to the operation command.

Abstract: A method for controlling photography using an unmanned aerial vehicle (UAV) is performed by a mobile terminal. After obtaining a photographing start command, the photographing start command being associated with a photographic sample, the mobile terminal generates a combined operation command according to the photographic sample. The combined operation command may include one or more flight parameters of the UAV. Next, the mobile terminal establishes a wireless connection with the UAV and then sends the combined operation command to the UAV via the wireless connection. The UAV then performs a corresponding series of actions sequentially according to the combined operation command to capture an image.

Abstract: A method for operating an aircraft is performed by a mobile terminal. The mobile terminal displays an aircraft operation interface on a touchscreen of the mobile terminal and monitors a touch control operation applied on the aircraft operation interface. After determining that the touch control operation is detected, the mobile terminal acquires sensor data from one or more sensors of the mobile terminal and obtains an aircraft operation command according to the sensor data. Finally, the mobile terminal sends the aircraft operation command to the aircraft that is wirelessly connected to the mobile terminal. The aircraft then performs a predefined operation according to the operation command.

Abstract: This application discloses a flight tag obtaining method, terminal, and server. A takeoff geographic location of a first unmanned aerial vehicle can be obtained when the first unmanned aerial vehicle takes off. The takeoff geographic location of the first unmanned aerial vehicle can then be sent to a server. A flight tag returned by the server can be obtained. The flight tag can indicate whether another aerial vehicle took off from the takeoff geographic location of the first unmanned aerial vehicle before the first unmanned aerial vehicle.

Abstract: The presently disclosed technology discloses an unmanned aerial vehicle control method and apparatus. A device displays a map. The device detects a first movement path on a touch-sensitive surface of the device. The device overlays a trajectory on the map in accordance with the first movement path.; The device automatically generates a number of waypoints along the trajectory. and the device displays the waypoints on the trajectory and sends instructions to an unmanned vehicle in accordance with the trajectory and the waypoints. The unmanned vehicle moves in accordance with trajectory by executing the instructions.

Abstract: A method for operating an unmanned aerial vehicle (UAV) is performed by a mobile terminal. The mobile terminal displays an image transmission interface on a touchscreen of the mobile terminal, the image transmission interface including a picture taken by the UAV that is wirelessly connected to the mobile terminal. After detecting a touch control signal applied on the touchscreen, the mobile terminal acquires an operation gesture according to the touch control signal and generating a corresponding operation command according to the operation gesture and a current control mode of the image transmission interface. Finally, the mobile terminal sends the operation command to the UAV. The UAV then performs a predefined operation according to the operation command.

Abstract: A method for controlling photography using an unmanned aerial vehicle (UAV) is performed by a mobile terminal. After obtaining a photographing start command, the photographing start command being associated with a photographic sample, the mobile terminal generates a combined operation command according to the photographic sample. The combined operation command may include one or more flight parameters of the UAV. Next, the mobile terminal establishes a wireless connection with the UAV and then sends the combined operation command to the UAV via the wireless connection. The UAV then performs a corresponding series of actions sequentially according to the combined operation command to capture an image.

Abstract: A multimedia synchronization method is performed by an aircraft that is wirelessly connected to a plurality of mobile terminals. After receiving a first authorized-user identifier sent by a first mobile terminal, the aircraft receives an aircraft operation command and a photographing command sent by the first mobile terminal. The aircraft performs aircraft flight control according to the aircraft operation command and collects multimedia data in a target photographing region according to the photographing command. Finally, the aircraft stores the multimedia data for which the first authorized-user identifier is used as an index identifier. The aircraft synchronizes the multimedia data to the first mobile terminal and a second mobile terminal that accesses the multimedia data.