5 results about "Current distribution" patented technology

The invention discloses a rapid optimization method for a superconducting cable body structure, relates to the technical field of high voltage and insulation, and is used for solving the problem that time and labor are consumed due to the fact that a cable needs to be designed manually in the prior art. The method comprises the following steps: receiving performance parameters and structural parameters of the cold insulation high-temperature superconducting cable; according to the performance and structure parameters, calculating constraint conditions of the structure parameters of the superconducting cable body; calculating current distribution of a conductor layer and a shielding layer according to the performance and structure parameters; and according to the current distribution calculation result, the current sharing principle of the preset conductor layer and the shielding layer and the constraint condition, calculating the optimal solution of the structure parameters of the superconducting cable body through a particle swarm algorithm. According to the method, the structure parameters of the cold insulation high-temperature superconducting cable body are quickly optimized through the particle swarm algorithm, and manual participation in optimization design is not needed.

The invention is applied to the technical field of lighting emitting diodes (LED), and provides an extension structure of an LED. The extension structure comprises a substrate 1, a transition layer 2, an u type gallium nitride layer 3, an n type gallium nitride layer 4, a quantum well layer 5 and a p type gallium nitride layer 6; the electron concentration of the n type gallium nitride layer 4 is gradually varied, and the electron concentration at the side far from the quantum well layer 5 is higher than that at the side close to the quantum well layer 5. The extension structure of the LED is simple in structure and convenient to manufacture; the problem of non-uniform current density distribution in the prior art is overcome; the current expansion is raised; the non-uniform current distribution is reduced; the lighting efficiency and durability of the LED can be effectively improved.

A broadband microstrip antenna, comprising an insulating substrate, a grounding sheet and a radiation sheet, the insulating substrate has a first surface and a second surface opposite to the first surface, the grounding sheet is made of conductive material And formed on the first surface, the radiation plate is made of conductive material and formed on the second surface, and includes a feed-in extending inward from the edge of the second surface and crossing the ground plate and supplying signal input arm, a radiation body extending from the feeding arm away from the ground plate, and a notch extending from a side of the radiation body toward a first direction, and the notch makes the side of the radiation body present a meandering shape In turn, the current distribution on the surface of the radiating body is changed, resulting in a high operating bandwidth.

The invention discloses a single-ended direct-current distribution line single-pole grounding fault distance measurement method, and belongs to the technical field of high-voltage direct-current distribution. The objective of the invention is to realize rapid and accurate positioning and distance measurement when a feeder line where a load is located has a single-pole grounding short circuit. According to the main scheme, a distance measuring module is arranged at each of the head ends of a positive feeder line and a negative feeder line to measure the distance of a fault feeder line, and the two distance measuring modules are used for measuring current waveforms to perform least square fitting to obtain respective corresponding parameters, and the parameters are substituted into a theoretical fault measuring distance formula for calculation. The method not only overcomes the defects that a traditional distance measurement method is inaccurate in measurement result and has no compatibility for a long line, but also improves the measurement accuracy, can enable a fault to be accurately positioned within the range of 40m, has remarkable superiority, and is suitable for popularization and application. A single-ended direct current power distribution network simulation model based on a modular multilevel converter (MMC) is built on MATLAB/PSCAD, and the reliability and remarkable superiority of the distance measurement method are verified.