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Method for judging coordination running state between provincial and local regions in coordination voltage control between provincial and local regions

The invention relates a method for judging coordination running state between provincial and local regions in coordination voltage control between provincial and local regions, belonging to the technology field of voltage automatic control in a power system. The method comprises the following steps: collecting high-voltage side reactive power of a transformer of a transformer substation at the boundary position between a province-level power grid and each region-level power grid as well as and high-voltage side bus voltage at the current time; calculating a voltage coordination upper limit and a voltage coordination lower limit expected by the local region power grid and uploading the upper limit and the lower limit to a province-level power grid controlling center; calculating a coordination upper limit and a coordination lower limit of the transformer high-voltage side reactive power at the boundary position between the province-level power grid and the region-level power grid, judging the running state of the transformer substation at the boundary position m between the current province-level power grid and the region-level power grid according to the above data. The method can master the current coordination running state between provincial and local regions in a visualized manner, is taken as a basis for controlling coordination voltage between the provincial and local regions, thereby eliminating the uncoordinated phenomenon between provincial and local regions and realizing reasonable distribution of the reactive power in a global scope.
Owner:TSINGHUA UNIV

Image processing device for vehicle

An image processing device for a vehicle, which generates a vehicle surroundings image of an overhead view of the surroundings of the vehicle as seen from above, the image processing device being provided with: a surroundings image acquisition unit (S30) that acquires a photographed front image and a photographed rear image from a front photographic device (11) and a rear photographic device (12); a calculation unit (S80) that calculates the moving distance of the vehicle using vehicle state information, including the information associated with the tire rotation angle of the vehicle, and parameter information associated with the tire outer diameter stored in a storage unit (34); a composite image creation unit (S100, S110, S120) that creates a vehicle surroundings image by using, as a history image, one past image of a region in the traveling direction of the vehicle among the photographed front image and photographed rear image, and compositing the history image with the other image on the basis of the moving distance; and a tire parameter updating unit (S250 to S360, S440, S480, S490) that updates the parameter information stored in the storage unit so as to reduce the deviation between the history image and the other image composited on the basis of the moving distance.
Owner:DENSO CORP
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