Abstract: A gas turbine overspeed protection method includes: a power utilization load of a generator is acquired, and a rotating speed value of a gas turbine is acquired; whether the power utilization load suddenly decreases or disappears is judged, and if so, an eddy current retarder is controlled by a controller to simulate the power utilization load to provide a braking torque for the generator; or, whether the rotating speed value exceeds a set speed range is judged, and if so, the gas turbine is controlled by the controller to reduce fuel supply, and a discharge valve of a gas compressor is opened to discharge a high-pressure gas to reduce the power output and the rotating speed of the gas turbine.

Abstract: This disclosure generally relates to power generation methods and systems based on gas turbine engines, and particularly to mobile and adaptive power generation systems and methods based on gas turbine engine for supplying mechanical and/or electrical power for fracturing operations at an oil wellsite. Various systems, platforms, components, devices, and methods are provided for flexibly and adaptively configure one of more gas turbines, hydraulic pumps, and electric generators to support both fracturing and electric demands at a well site. The disclosed implementations enable and facilitate a mobile, adaptive, and reconfigurable power system to provide both mechanical and electric power for hydraulic fracturing operation.

Abstract: A network meeting application for providing network meetings, such as web conference meetings, runs on a presenter device. In response to a request for a network meeting from an attendee device, the presenter device creates a secure desktop separate from a working desktop. The presenter may use the secure desktop to share documents, presentations, or other applications with the attendee device. The attendee device is blocked from accessing the working desktop of the presenter device. A presenter using the presenter device may switch between the working desktop and the secure desktop. Security policies, downloaded to the presenter device from a server, determine the applications the attendee may run on the secure desktop. The secure desktop thereby protects the integrity of the presenter's working desktop during a web conference meeting, while allowing documents, presentations, or other applications to be shared with attendees via the secure desktop.