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41results about How to "Clear advantages" patented technology

Active damping strategy of LCL grid-connected inverter

InactiveCN108258726ASolve the overhead problemDoes not affect steady state characteristicsSingle network parallel feeding arrangementsHarmonic reduction arrangementKaiman filterGrid connected inverter
The invention discloses an active damping strategy of an LCL grid-connected inverter. The strategy mainly comprises the steps that according to a state equation of an LCL filter, a Kalman filter is designed, a state quantity of a system is evaluated by detecting network voltage and inverter side inductive current, and sending output voltage of the inverter obtained by a modulating wave gaining through an inverter bridge to the Kalman filter. The inverter side inductive current, grid-connected current and capacitor voltage are evaluated by the Kalmen filter. Capacitive current is obtained by subtraction between the inverter side inductive current and the grid-connected current, the obtained capacitive current and the grid-connected current are sent to a current controller, a direct controlstrategy of feedforward grid-connected current of the active damping and network voltage is finally achieved. According to the active damping strategy of the LCL grid-connected inverter, the advantages of the active damping strategy and Kalmen filter are combined, a Kalmen filtering algorithm is used to accurately evaluate the state quantity of the LCL filter so as to be used for active damping feedback, and so that the problem is solved that extra inverter expenses are brought by the active damping strategy.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Coagulation monitoring device, coagulation monitoring method, and coagulation system

A coagulation monitoring device for monitoring the processing state of water to be processed that is to undergo coagulation processing includes: a laser light irradiation unit for irradiating, onto a measurement area of the water to be processed, laser light that is emitted at least at a prescribed time interval, has a prescribed frequency, and has been subjected to amplitude modulation; a scattered light reception unit for receiving light that has been scattered by particles in the water to be processed in the measurement area; a signal processing unit for extracting measurement values expressing the intensity of the scattered light from the reception signal obtained by the scattered light reception unit; and a measurement value calculation unit for taking in a plurality of measurement values comprising m (where m is at least 2) sets that each have n (where n is at least 2) continuous or discontinuous measurement values, extracting a plurality of measurement values from each set in order from the lowest value, and calculating an average measurement value from a plurality of measurement values in which the lowest measurement value has been excluded from the extracted measurement values. As a result, the influence of flocs generated in water to be processed that is undergoing coagulation can be avoided, and the suspended-solid turbidity of the water to be processed can be measured stably.
Owner:KURITA WATER INDUSTRIES LTD

5G voice service processing system and method in high-speed railway scene

The invention relates to a 5G voice service processing system and method in a high-speed railway scene, and belongs to the field of mobile communication, the system comprises a trackside macro base station and an onboard subsystem, wherein the onboard subsystem comprises an in-train small base station and an onboard switching device; the in-train small base station comprises a 5G small base station and a 4G small base station deployed in a carriage; the onboard switching device comprises customer preposed equipment CPE and a roof antenna; messages are connected to a core network and an IMS of an operator through the roof antenna and the trackside macro base station, and 5G voice communication in a high-speed railway scene is achieved. According to the invention, the small base station and the CPE are deployed in the carriage of a high-speed train, the mobile communication signal quality in the carriage under the condition of high-speed movement is improved, and the 5G user in the carriage of the high-speed train running at a high speed can realize the high-quality voice service through the voice scheme of falling back to the 4G network through the EPS FB under the condition of not opening the VoNR.
Owner:国铁吉讯科技有限公司

5G networking system and method in high-speed rail scene

The invention relates to a 5G networking system and networking method in a high-speed rail scene, and belongs to the field of communication, and the method comprises the steps: configuring IP addresses of a 5G small station and a unified management platform; starting the client and the first gateway, and establishing a special VPN tunnel between the 5G communication gateway and the unified management platform; completing the registration of the 5G small station through the special VPN tunnel; and transmitting data of the 5G small stations and the 5G users through the special VPN tunnel. In the embodiment of the invention, the train passes through the core networks of all provinces along the line in the running process, related configuration does not need to be carried out for legitimate network access of the 5G small station, and the operation and maintenance cost and the modification work are not increased. In the moving process of the train, the 5G users in the train are always registered to the unified management platform, and the service continuity is good. 5G small station configuration in the vehicle is simplified, and meanwhile, the deployment distance between macro stations along the line can be increased, so that the cost is reduced.
Owner:国铁吉讯科技有限公司
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