Настройки

Укажите год
-

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

Подробнее
-

Мониторинг СМИ

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

Подробнее

Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Ведите корректный номера.
Укажите год
Укажите год
Применить Всего найдено 8. Отображено 8.
09-06-2023 дата публикации

IGCT converter valve turn-off control method based on current change rate detection

Номер: CN116247715A
Автор: WANG YU, SHEN XIAOLIN, LI MING, WU FANGJIE, JI YIMING, WANG YAOXUAN, DU SHANG'AN, WANG AO, CHAO YANG, LIANG CHENGUANG, HUANG RUI
Принадлежит:

The invention provides an IGCT converter valve turn-off control method based on current change rate detection, and the method comprises the steps: receiving a converter valve side line voltage phase angle and a trigger instruction angle given by upper control, inputting a trigger instruction to an IGCT when the valve side line voltage phase angle is greater than the trigger instruction angle, and conducting a converter valve; detecting the change rate of the valve current of the converter valve along with time; after a phase-change valve corresponding to the converter valve is conducted, a maximum phase-change angle is set; and in the maximum commutation angle time, when the current of the converter valve is reduced, the time change rate is approximate to zero, and the current of the converter valve meets the device turn-off capability limitation, inputting a turn-off instruction to the IGCT, and turning off the converter valve. The method can effectively solve the problem of commutation ...

Подробнее
Номер записи: 1
09-05-2023 дата публикации

Main loop parameter calculation method and device of SLCC conversion technology and medium

Номер: CN116090256A
Автор: MA WEIMIN, WANG LING, LI MING, SHEN XIAOLIN, ZHU QUANLE, WU FANGJIE, XUE YINGLIN, XU YING, JI YIMING, DU SHANG'AN, YIN JIAN, LIANG CHENGUANG, WANG YAOXUAN, WANG AO
Принадлежит:

The invention relates to a major loop parameter calculation method for an SLCC (selective line commutation converter) technology, and the method comprises the steps: building a corresponding circuit equivalent model and a circuit simplified equivalent model according to a topological structure of an SLCC; establishing a corresponding phasor diagram according to the circuit equivalent model and the circuit simplified equivalent model; on the basis of the phasor diagram and in combination with a preset control target, calculating a grid-connected point voltage and a front-back deviation angle of the transformer; and according to the grid-connected point voltage and the front and back deviation angles of the transformer, performing steady-state parameter calculation of main loop parameters. According to the technical scheme, by establishing the phasor diagram, the grid side current and the valve side current are separated, main loop parameter calculation is simplified into forward calculation ...

Подробнее
Номер записи: 2
27-06-2023 дата публикации

DC filter grounding method and system

Номер: CN116345427A
Автор: LIANG CHENGUANG, SHEN XIAOLIN, LI MING, WU FANGJIE, MA YULONG, JI YIMING, WANG YAOXUAN, DU SHANG'AN, WANG AO, WANG YU, CHAO YANG, HUANG RUI, XUE YINGLIN, TENG SHANGFU
Принадлежит:

The invention relates to a DC filter grounding method and system, and the method comprises the steps: determining a grounding mode of a DC filter according to a preset DC filter operation condition; when the direct current filter needs to meet a preset direct current filter operation condition, a pair of grounding type direct current filters is configured at each of two ends of the direct current system, or a pair of grounding type direct current filters is configured at one end of the direct current system, and a group of bridging type direct current filters is configured at the other end of the direct current system; when the direct-current filter does not need to meet the preset direct-current filter operation condition, only a pair of grounded direct-current filters needs to be configured at any end of the direct-current system. The method can deal with the problem that 6-time voltage harmonic waves on the DC side of a DC power transmission system adopting a symmetrical monopole wiring ...

Подробнее
Номер записи: 3
27-06-2023 дата публикации

Defect monitoring method and system for lightning arrester resistor disc of controllable self-recovery energy dissipation device

Номер: CN116337899A
Автор: DU SHANG'AN, LI MING, SHEN XIAOLIN, WU FANGJIE, JI YIMING, WANG YAOXUAN, WANG LING, WANG AO, WANG YU
Принадлежит:

The invention relates to a controllable self-recovery energy dissipation device lightning arrester resistor disc defect monitoring method and system. The method comprises the following steps: determining the maximum parallel column number of each group of energy absorption lightning arresters of a controllable self-recovery energy dissipation device energy absorption lightning arrester; based on the maximum number of parallel columns of each group of energy absorption lightning arresters, obtaining the actual number of parallel columns meeting the preset economic and technical conditions and the monitoring CT precision requirement; and grouping the controllable self-recovery energy dissipation device energy absorption lightning arresters based on the determined actual parallel column number, arranging monitoring CTs in each group, and monitoring the defects of resistor discs in the controllable self-recovery energy dissipation device energy absorption lightning arresters. According to the ...

Подробнее
Номер записи: 4
23-06-2023 дата публикации

Method and system for monitoring running state of lightning arrester of controllable self-recovery energy dissipation device

Номер: CN116298510A
Автор: SONG SHENGLI, DU SHANG'AN, SHEN XIAOLIN, YANG PENGCHENG, WU FANGJIE, JI YIMING, WANG YAOXUAN, WANG LING, WANG AO, WANG YU
Принадлежит:

The invention relates to a controllable self-recovery energy dissipation device lightning arrester operation state monitoring method and system, and the method comprises the steps: carrying out the Fourier decomposition of the collected leakage current and bus voltage of a lightning arrester, and obtaining a fundamental component and a third harmonic component corresponding to the leakage current and bus voltage; comparing the fundamental component and the third harmonic component of the leakage current with a given reference value, and correcting the fundamental component and the third harmonic component of the leakage current by using the fundamental component and the third harmonic component of the bus voltage and the current environment temperature according to the comparison result; and obtaining the operation state of the lightning arrester according to the correction result. According to the invention, the leakage current is decomposed into the fundamental component and the third ...

Подробнее
Номер записи: 5
08-08-2023 дата публикации

Hybrid power grid commutation converter and power increasing and decreasing method and system thereof

Номер: CN116565933A
Автор: JI YIMING, SONG SHENGLI, LI MING, WU FANGJIE, SHEN XIAOLIN, YANG PENGCHENG, DU SHANG'AN, WANG YAOXUAN, WANG AO, WANG YU, CHAO YANG, LIANG CHENGUANG, HUANG RUI, CUI LYU
Принадлежит:

The invention relates to a hybrid power grid commutation converter and a power increasing and decreasing method and system thereof.The hybrid power grid commutation converter comprises an LCC converter and a full-bridge submodule converter valve, and the LCC converter comprises a converter transformer and a converter thyristor valve; and the full-bridge sub-module converter valve in each path of the three-phase circuit is connected between the converter transformer and the converter thyristor valve. The power increasing and decreasing method and system based on the hybrid power grid commutation converter comprises the following steps: generating a basic voltage for counteracting an alternating-current line voltage to be commutated by using a full-bridge sub-module converter valve; a controllable direct-current voltage Up used for controlling the commutation speed is superposed on the basic voltage; and the direct-current voltage is controlled together with a trigger angle for controlling ...

Подробнее
Номер записи: 6
09-09-2015 дата публикации

Construction method of resistance reduction and grounding device of transformer station

Номер: CN104901030A
Автор: WEN SHIYUN, DU SHANG'AN, LIU SEN, QU YANMING, ZHAO DONGCHENG
Принадлежит:

The invention, which belongs to the technical field of the electrical power engineering, particularly relates to a construction method of a resistance reduction and grounding device of a transformer station. The method comprises: a surveyor measures a soil resistivity, a frozen soil depth, and a soil layering situation in a site area of a transformer station to obtain surveying data; a soil model is established according to the surveying data; on the basis of the soil model, a grounding device inside the station is designed in the site area of the transformer station; safety verification is carried out on the grounding device designed at the last step so as to obtain a verification result; if the verification result meets the requirement, a next step is executed; if the verification result does not meet the requirement, a grounding device is arranged externally outside the site area of the transformer station and safety verification is carried out; the verification result is stored; a construction ...

Подробнее
Номер записи: 7
09-06-2023 дата публикации

Receiving end tap switch control method and device of SLCC commutation technology, and medium

Номер: CN116247732A
Автор: MA WEIMIN, HUANG YONG, WANG LING, LI MING, WU FANGJIE, SHEN XIAOLIN, ZHU QUANLE, XU YING, ZHANG TAO, JI YIMING, DU SHANG'AN, YIN JIAN, GUO ZIYU, HUANG CAOWEI, WANG YAOXUAN, WANG AO
Принадлежит:

The invention relates to a receiving-end tap-changer control method of an SLCC commutation technology, and the method comprises the steps: building a corresponding equivalent model of the motion of a receiving-end tap-changer according to a topological structure of the SLCC; and calculating the action times of the receiving end tap switch according to a set receiving end tap switch control strategy. The equivalent model comprises a converter transformer branch and an SVG branch which are connected with the high-voltage direct-current power transmission end; the converter transformer branch and the SVG branch are connected at a grid connection point; the converter transformer branch comprises an alternating current power supply Us and an impedance which are connected with each other; system reactive power exchange in the converter transformer branch is Qs, converter transformer reactive power consumption is Qtr, converter transformer valve side voltage is Uv, and converter transformer valve ...

Подробнее
Номер записи: 8