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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 3. Отображено 3.
09-05-2023 дата публикации

Method for locking distance element of photovoltaic power station sending-out line

Номер: CN116093898A
Автор: LI LEI, LIANG YABO, HE JIANAN, NIU JIAN, LIU HAITAO, YIN LIANG, QI SHENGLONG, LU XIANG, CHEN XIAOQIAN, BAI YIZHE, XIONG JUNHUI, MAN ZAILING, GU YINAN
Принадлежит:

The invention discloses a distance three-section protection locking method for a photovoltaic power station sending-out line. The method comprises the following steps: firstly, after distance three-section protection is started, extracting a phase current component of a protected line, calculating the third harmonic content of the phase current component and the ratio of the third harmonic to the second harmonic, and when the third harmonic content of the phase current component exceeds 0.5 and the ratio of the third harmonic to the second harmonic exceeds 1.5, judging that the distance three-section protection is locked by sympathetic inrush current; otherwise, determining that the fault current is open distance three-section protection. According to the method, the sympathetic inrush current and the magnetizing inrush current generated by no-load closing of the boosting transformer of the photovoltaic power station can be correctly judged, and incorrect protection action caused by too ...

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Номер записи: 1
02-06-2023 дата публикации

Offshore wind power direct current collection line fault isolation method based on half-bridge MMC current limiting control

Номер: CN116207720A
Автор: HAO ZHIGUO, LIANG TIANYU, ZHANG YUNING, XIE FAN, LIU WEI, MAN ZAILING
Принадлежит:

The invention discloses an offshore wind power DC collection line fault isolation method based on half-bridge MMC current-limiting control. The method comprises the following steps: S1, collecting current of each collection line; s2, the absolute value of the current gradient of each collection line is calculated, starting element discrimination is carried out, if the criterion is met, it is considered that the collection line breaks down, execution continues, and if not, the step S1 is returned; s3, locking a direct-current transformer at the head end of the collection line; s4, a DCT0 low-voltage side MMC converter is switched into a current limiting control mode; s5, starting a collection line relay protection device to perform fault line selection; s6, disconnecting switch on-off condition judgment is carried out, if a criterion is met, execution is continued, and if not, the current of each collection line is continued to be collected; and S7, disconnecting switches at the two ends ...

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Номер записи: 2
26-05-2023 дата публикации

Transformer differential protection harmonic braking auxiliary discrimination method

Номер: CN116169638A
Автор: LI LEI, LIANG YABO, HE JIANAN, NIU JIAN, LIU HAITAO, YIN LIANG, QI SHENGLONG, LU XIANG, CHEN XIAOQIAN, BAI YIZHE, XIONG JUNHUI, MAN ZAILING, GU YINAN
Принадлежит:

The invention discloses a harmonic braking auxiliary discrimination method for transformer differential protection. Firstly, after a transformer differential protection harmonic braking criterion is started, phases of a differential current fundamental component and a second harmonic component are extracted, the phase difference of the fundamental component and the second harmonic component is calculated, when the phase difference is in a 00 or 1800 region, inrush current locking differential protection is judged, and if the phase difference exceeds the region, it is judged that a fault occurs, and the braking criterion is unlocked to protect an exit action. According to the method, the fault occurring when the transformer and the sympathetic inrush current occur can be correctly judged, and differential protection operation refusal or action delay caused by harmonic braking is avoided.

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Номер записи: 3