4results about How to "Improve quickness" patented technology

The application discloses a kind of multi-objective sled dog protection optimization method and system based on myxomycete dynamic weight, it is related to power distribution network relay protection technical field, including: obtaining fault current to establish action response characteristic model and sensitivity index, construct anti-time limit overcurrent protection double-objective optimization function;Global optimization is carried out using improved multi-objective sled dog algorithm, population is initialized by Piecewise chaotic mapping, dynamic weight is adaptively distributed by introducing myxomycete algorithm in local search stage, and individual position is updated in combination with local difference disturbance strategy;The solution set is objectively and comprehensively evaluated using entropy weight TOPSIS strategy and the optimal compromise setting value is output.The optimization method effectively resolves the conflict that traditional protection is difficult to consider both speed and sensitivity, and effectively guarantees the safe and reliable operation of the distribution network with distributed power supply.

The invention relates to a direct current transmission line single-ended traveling wave protection method based on a fault voltage first traveling wave area ratio. The method comprises the following steps: S1, determining an internal and external fault identification criterion of a forward region; s2, establishing a protection starting criterion; s3, establishing a fault direction criterion; s4, establishing a fault pole selection criterion; and S5, determining a protection scheme. According to the method, internal and external faults can be identified and accurately distinguished within 1ms, high sensitivity and reliability are still achieved under the high-resistance fault condition, and meanwhile good robustness is achieved under noise interference and parameter change of the current limiting reactor.

This invention discloses a dual-channel spraying device for weed control during crop seedling stages, belonging to the field of agricultural pesticide application technology. It includes a frame and a spray boom mounted on the frame. The spray boom is equipped with a lifting mechanism to raise and lower the boom and maintain its stability. A foldable spray boom is mounted on the boom. Below the spray boom are a target nozzle array and a sealing nozzle array. The target nozzle array is used for targeted spraying of seedling weeds, while the sealing nozzle array is used for sealing spraying of the soil surface in the work zone. The target nozzles of this invention employ a small cone angle and close spacing, enabling precise, point-to-point spraying of weeds and avoiding the waste of pesticide and the risk of crop damage caused by uniform spraying across the entire area. The sealing nozzles employ a large fan angle and wider spacing, forming a continuous and uniform pesticide film through droplet overlap, ensuring consistent sealing effect. The two spraying modes complement each other on the same platform, balancing precision and comprehensiveness.

The present application belongs to the technical field of electrified railway traction power supply, and particularly relates to a traction network multi-terminal longitudinal differential protection system and method under a double-sided through AT power supply mode. The system sets multi-terminal longitudinal differential protection elements according to uplink and downlink feeders, covers multi-terminal branches composed of traction substations, AT substations and partition substations, and each branch is configured with a current transformer. The protection element includes a power frequency variation current differential element, a T-line / F-line current differential element and a low-voltage differential current starting element, which are respectively adapted to fault transient and steady state characteristics, and realize rapid fault identification and accurate removal through cooperative action. The method combines current threshold criterion, voltage criterion and opposite side allowable signal to ensure the rapidity, selectivity, sensitivity and reliability of action, realize rapid removal of fault two-end power supply, reduce the fault isolation range, and ensure the safe and stable operation of the traction network.