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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 10. Отображено 10.
19-03-2014 дата публикации

Double-feed wind generating set low-subharmonics current inhibition method

Номер: CN103647282A
Автор: YAO WEIZHENG, XIAO PENG, HE QING, LIU HAIJIAN, LIU GANG, XU ENZE
Принадлежит:

The invention relates to a double-feed wind generating set low-subharmonics current inhibition method. In case of large electrical network voltage low subharmonics, by use of the technical scheme, low-subharmonics current transmitted to an electrical network by a set can be compensated and inhibited, the generating electric energy quality is improved, and the electrical network adaptability can be enhanced. According to the invention, a frequency selection controller is adopted, detected grid-connected total current low-subharmonics current is processed, harmonic wave voltage is outputted for compensating and inhibiting harmonic wave current caused by electrical network voltage harmonic waves, and finally low subharmonics are controlled at about a zero value.

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Номер записи: 1
25-08-2023 дата публикации

Quick access device for wall-hung generator car

Номер: CN116646779A
Автор: ZHAO WEIJUN, ZHONG DEQI, DENG YULU, ZHU TAO, ZHANG CHI, DOU YUBO, ZHANG HONGFENG, DONG LEI, LIU JUANHONG, LI ZHENDI, XU PENG, LIU YIZE, WANG ZHI, NAN ZHANGLANG, XU ENZE, CHEN BAOZENG, XU BIN, XU LI, WEI HAO, WANG JIANBIN, XIANG QINGLAN
Принадлежит:

The invention discloses a wall-hung type generator car quick access device which comprises a mounting plate and a limiting mechanism, a fixing plate is fixedly connected to the right side of the mounting plate, a groove is formed in the right side of the fixing plate, a first threaded rod is rotationally connected into the groove, a first threaded sleeve is connected to the first threaded rod in an engaged mode, and a second threaded sleeve is connected to the second threaded rod in an engaged mode. A connecting plate is fixedly connected to one side of the first threaded sleeve, a transparent waterproof cover is fixedly connected to the right side of the connecting plate, and the lower end of the transparent waterproof cover is in an open state. According to the device, through cooperative arrangement of a handle, a worm and a worm gear, a second threaded rod can be driven to rotate, the second threaded rod can drive a push plate to move through a second threaded sleeve, the push plate ...

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Номер записи: 2
08-04-2015 дата публикации

Space vector modulation method of three-level current converter

Номер: CN104506064A
Автор: XIAO PENG, GAO YAQIU, LIU GANG, SUN JIAN, LIANG YAN, XU ENZE, LIU HAIJIAN, ZHAO YU
Принадлежит:

The patent of the invention relates to a space vector modulation method of a three-level current converter. According to the modulation method, synthesis of a reference voltage vector and calculation of basic vector action time are performed by adopting a non-orthogonal 60-degree coordinate system. The adopted 60-degree coordinate system is defined as a g-h coordinate system. The g axis is taken to be superposed with the alpha axis in an alpha-beta coordinate system and anticlockwise rotated for 60 degrees to act as the h axis. Under the 60-degree coordinate system, all the basic vector coordinates of the three-level current converter are integers so that the nearest four basic vectors can be obtained via top and bottom integral rounding of the coordinates of the four basic vectors under the 60-degree coordinate system as for the arbitrary space reference voltage vectors. Compared with a conventional three-level modulation algorithm, calculation amount is substantially reduced by the method ...

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Номер записи: 3
24-09-2014 дата публикации

Three-level converter neutral point potential balancing control method and device

Номер: CN104065292A
Автор: ZHAO YU, XIAO PENG, LIU GANG, SUN JIAN, LIANG YAN, XU ENZE, LIU HAIJIAN, GAO YAQIU
Принадлежит:

The invention relates to a three-level converter neutral point potential balancing control method and device which can be used to realize the zero potential control of the neutral point potential and has important practical significance. According to the invention, the multi-carrier CBPWM method based on zero sequence voltage injection is adopted to realize the neutral point potential balancing control. The upper voltage and the lower voltage of a direct-current bus neutral point are acquired, the different of the two voltages is inputted into a sliding mode variable structure controller to obtain the zero sequence voltage, and the zero sequence voltage is superimposed to the original three-phase modulation wave, so the neutral point voltage balancing control effect can be realized. The scheme has advantages of fast response speed and good robustness, and can be adapt to working conditions of different power factors and loads.

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Номер записи: 4
22-10-2014 дата публикации

IGBT three-level power module

Номер: CN104113192A
Автор: SUN JIAN, ZHAI CHAO, XU MINGMING, LIU HAIJIAN, XU ENZE, WANG HONGFEI, WANG QINGLONG, GAO YAQIU
Принадлежит:

The invention relates to an IGBT three-level power module that can be applied to a converter of a high-power wind generating set. The IGBT packaging mode used by the module is a crimping packaging mode; and the NPC three-level single-phase circuit topology is used. A bus support capacitor, an IGBT drive circuit, a bus discharge circuit, a direct-current power-taking circuit and the like are integrated inside the module. The whole module does not need the external power supply; and the power supply demand of the IGBT drive circuit can be satisfied in a self-sufficiency mode. Meanwhile, multiple protection measures including IGBT over-current protection, IGBT over-voltage protection, short-circuit detection protection, door trigger drive power supply detection protection, pulse width detection protection, and over-temperature protection and the like are configured in the module. And the module also provides temperature collection analog quantity for the set.

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Номер записи: 5
14-04-2023 дата публикации

Power module

Номер: CN115967292A
Автор: SUN JIAN, WANG KUO, ZHANG KAI, REN CHENGCAI, YU LIYANG, WANG GAOHU, ZUO GUANGJIE, XU ENZE, LI HAO
Принадлежит:

The invention discloses a power module which comprises a box body, and two sets of power element groups are arranged in the box body. A middle supporting plate is arranged in the box body and divides the inner space of the box body into an upper part and a lower part; the two sets of power element groups are arranged at the upper part of the box body in parallel; each set of power element group comprises a water-cooled radiator, an IGBT module, a laminated busbar, a bleeder resistor and a bypass switch. According to the invention, two sets of power element groups are combined into one, the power density of the module is doubled, the size of the module is halved, the boundary dimension of a corresponding power cabinet is halved, and the occupied area is reduced; the layout is more compact, connecting copper bars and module supporting insulating parts between adjacent modules are reduced, and the cost of the whole set of SVG equipment is reduced; the device is high in integration level and ...

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Номер записи: 6
26-02-2014 дата публикации

Island detection method of distributed wind-power converter

Номер: CN103606950A
Автор: YAO WEIZHENG, XIAO PENG, LIU GANG, ZHAO YU, XU ENZE
Принадлежит:

The invention relates to an island detection method of a distributed wind-power converter. The method comprises the following steps that: a sinusoidal reactive current disturbance Iq with a set frequency is added to a network side of a distributed wind-power converter, wherein the amplitude of the Iq is expressed by a formula: k1|deltaf|+k2Grid_Ia1; and an average value of a voltage frequency of a power grid is calculated and whether the average value is in a normal range is detected so as to determine whether an overfrequency or underfrequency phenomenon occurs; and when the overfrequency or underfrequency phenomenon occurs and a time segment is set, overfrequency or underfrequency protection is triggered and an island phenomenon is detected; and otherwise, no island phenomenon occurs. According to the invention, island detection is carried out by using the reactive current disturbance. When grid-connected operation of the system is carried out, the voltage at the load terminal is suppressed ...

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Номер записи: 7
04-04-2023 дата публикации

Joint target detection and identification method based on pet equipment platform

Номер: CN115909392A
Автор: MENG LIMIN, KE XUQING, XU ENZE
Принадлежит:

A joint target detection and identification method based on a pet equipment platform comprises the following steps: acquiring a data set on a large scale, performing data enhancement after removing useless and wrong data, and then labeling categories for the enhanced data set and dividing the enhanced data set into a training set, a test set and a verification set; respectively sending to a lightweight network model and a large neural network model to carry out algorithm model training so as to obtain a pet identification model; a lightweight network model is deployed in a local pet equipment terminal, the target condition in the view field is continuously monitored in real time, an analysis result is uploaded to a server cloud, a reliable result is reserved when the cloud detects that the similarity degree reaches a certain threshold value, and important data is uploaded to a message server in time to inform an owner; a large neural network model is deployed in a server cloud, analysis ...

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Номер записи: 8
23-07-2014 дата публикации

Rotor magnetic flux linkage distinguishing method for permanent magnet motor

Номер: CN103944480A
Автор: YAO WEIZHENG, XIAO PENG, LIU GANG, LIU HAIJIAN, GAO YAQIU, HE QING, FENG YUPENG, XU ENZE
Принадлежит:

The invention relates to a rotor magnetic flux linkage distinguishing method for a permanent magnet motor. The method comprises the steps that firstly, starting is carried out with the constant current, secondly, the pulse is blocked after acceleration is carried out to reach the rated revolving speed, thirdly, the stator voltage amplitude and the stator voltage angular frequency are obtained through software phase locking on the stator voltage, and fourthly, a rotor flux linkage is calculated. According to the method, on one hand, it can be effectively guaranteed that the starting current is in a controlled state through a current closed loop, and the starting process is smooth and is not impacted; on the other hand, the rotating state can be achieved through self-starting without an electric device, the stator voltage counter emf is obtained by blocking the pulse, and therefore the rotor flux linkage can be accurately calculated.

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Номер записи: 9
21-09-2011 дата публикации

Tubular aerator with two porous tubes

Номер: CN0102190366A
Автор: ENZE XU, XU ENZE
Принадлежит:

The invention relates to the structure improvement of a tubular aerator, in particular to a tubular aerator with two porous tubes, which has simple structure and high production efficiency and is provided with a supporting tube hard to break. The tubular aerator comprises a supporting tube, wherein a diaphragm with micropores is arranged outside the supporting tube, an internal tube is arranged on the tube wall of the supporting tube, a gas conveying tube passing through a gas distributing tube is arranged at the vertical center position of the internal tube, and a sealing gasket is arranged between the gas conveying tube and the gas distributing tube; air holes are arranged on the gas conveying tube inside the gas distributing tube, sealing plugs are arranged at two ends of the internal tube, and through holes are arranged at the part of the internal tube, which is in contact with the diaphragm.

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Номер записи: 10