2results about How to "Does not affect temperature" patented technology

The present application relates to the technical field of flexible direct current transmission, and particularly relates to a discharge method of a flexible direct current converter valve operation test system, when a stop command is issued, all power modules of the flexible direct current converter valve continue to operate discharge according to the stop command in a specific current modulation mode, until all the power modules are at the lowest set voltage, and then static discharge is performed until the voltage of all the power modules drops to a safe voltage, that is, the discharge is completed; wherein the specific current is a current less than 50% of the rated current. The stop and lock discharge strategy adopted in the present application does not require an additional discharge device, improves the discharge rate of the flexible direct current converter valve test, reduces the flexible direct current converter valve discharge waiting time, improves the production and test efficiency of the flexible direct current converter valve equipment, improves the design and type test verification speed, and improves the production routine test capacity.

This invention discloses an adjustable shading device for simulating low-light habitats for crops in the field, relating to the field of agricultural technology. The key technical features are: a telescopic rod and a semi-circular tube, with a first rain-collecting pipe connected to both ends of the semi-circular tube; a track fixedly connected to both ends of the telescopic rod; and the first rain-collecting pipe movably connected to the track. This invention provides shading without affecting the crop's growth environment, collects rainwater, automatically adjusts the shading spacing, and facilitates loading and unloading.