3results about How to "Prevent wrong action" patented technology

With the wide access of four-quadrant power supply represented by battery energy storage station and flexible HVDC system into power grid, the complex fault characteristics of the four-quadrant power supply bring challenges to traditional relay protection, resulting in the failure of traditional current differential protection. In order to solve this problem, a protection method based on Hough fault coefficient is disclosed. The protection method uses the improved Hough transform to extract the slope of the two-dimensional current trajectory, and selects three specific slope angles to construct the Hough fault coefficient to quickly and sensitively identify the internal and external faults. The Hough fault coefficient shows excellent reliability when facing various internal fault conditions on the AC tie line of the four-quadrant power supply, and ensures the safety of the protection in the presence of non-ideal working conditions such as CT saturation, CT error, synchronization error, noise and abnormal value.

The invention discloses skiing professional action multi-dimensional capture bracelet and foot ring combined equipment which comprises a left bracelet body and a right bracelet body which are worn on the two wrists correspondingly, and a left foot ring body and a right foot ring body which are worn on the two ankles correspondingly. An inertial measurement unit, a flexible display screen, a vibration motor and a Bluetooth module are integrated in each main body; and a main control chip is also arranged in the left hand ring main body and is wirelessly connected with the other three main bodies through a Bluetooth module so as to receive and process motion data synchronously acquired by the four point positions and generate a multi-dimensional skiing action model. Through four-limb multi-point synchronous capture, in combination with real-time display and vibration feedback, the gravity center transfer and limb postures of the skier can be precisely restored, an athlete is helped to correct wrong actions in time, and the method is suitable for action analysis and technology improvement in skiing training.

This invention relates to the field of power distribution cabinet technology and provides an intelligent monitoring system and method for environmentally adaptive power distribution cabinets. The system includes: S1, integrating several environmental sensors within the cabinet to collect environmental data during a collection period; S2, pre-setting an environmental state recognition model to obtain an environmental state pattern; S3, using the environmental state pattern as a judgment condition and external environmental data as a constraint condition, inputting them into a pre-set environmental decision rule to obtain a set of decision actions; S4, prioritizing the decision actions within the decision action set to obtain the optimal set of decision actions; S5, executing the decision actions and recording the decision results; and S6, performing backtracking analysis on the historical database according to a backtracking period to optimize the decision threshold. This invention achieves adaptive adjustment of the power distribution cabinet to the environment through a pre-set environmental state recognition model and environmental decision rules, and realizes adaptive optimization of the decision threshold through backtracking analysis of the historical database during the backtracking period.