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

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Применить Всего найдено 9. Отображено 9.
06-06-2023 дата публикации

Temperature early warning method, device and system

Номер: CN116222803A
Автор: PAN NIAN'AN, LIU KUN, MA XIANGMAO
Принадлежит:

The invention provides a temperature early warning method, device and system, the method is applied to a data collector, and the method comprises the following steps: constructing a temperature early warning reference curve of an inverter; when the inverter is in a working state, temperature and power combined data of the inverter are collected in real time; judging whether the inverter is abnormal or not based on the temperature and power combined data collected in real time and the temperature early warning reference curve; and if the inverter is abnormal, reporting a fault early warning message corresponding to the inverter. By applying the method provided by the invention, the abnormal inverter can be found in time by collecting the temperature of the inverter, and early warning is carried out.

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Номер записи: 1
30-06-2023 дата публикации

Inverter and harmonic suppression method under different power grid intensities

Номер: CN116365848A
Автор: WANG JIAXIANG, LI HAITAO, PAN NIAN'AN, CHENG LIN, YAN JIAWEI
Принадлежит:

The invention discloses an inverter and a harmonic suppression method under different power grid intensities. The inverter comprises a power conversion circuit and a controller, the power conversion circuit is used for converting the input direct current into alternating current and outputting the alternating current; and the controller is used for changing the lead amount of phase angle lead compensation in a repetitive control link of the inverter until THD is less than or equal to a preset threshold value when the THD of the power grid is greater than the preset threshold value, and the repetitive control link is used for performing repetitive control and phase angle lead compensation on the current instruction value of the inverter. According to the inverter, under the condition that the power grid intensity is unknown, the advance quantity adapting to the current power grid intensity is obtained by adjusting the advance quantity, so that the THD of the power grid is effectively reduced ...

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Номер записи: 2
16-05-2023 дата публикации

Photovoltaic system, insulation resistance detection method and inverter system

Номер: CN116131341A
Автор: QIAN YUANDONG, LIANG CHENG, LI HE, WANG JINGJING, QIAN YONGHENG, PAN NIAN'AN
Принадлежит:

The invention discloses a photovoltaic system, an insulation impedance detection method and an inverter system. The photovoltaic system comprises an inverter, a direct current source and a controller. The input end of the inverter is used for connecting a photovoltaic string; the direct-current source and the resistor are connected in series and then are connected between the virtual neutral point of the inverter and the ground; the controller is used for changing the output voltage of the direct current source so as to change the voltage of the virtual neutral point; and the insulation impedance of the photovoltaic system is obtained according to the resistance value of the resistor, the output voltage before and after the change of the direct current source and the corresponding voltage to ground of the virtual neutral point before and after the change. A direct-current source is added between a virtual neutral point of an inverter and the ground, the direct-current source outputs different ...

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Номер записи: 3
04-07-2023 дата публикации

Photovoltaic power generation system and fault protection method and device thereof, combiner box and inverter

Номер: CN116388131A
Автор: PAN NIAN'AN, ZHANG BING, FENG JIGUI, DING JIE, ZHANG XIANLI
Принадлежит:

The invention discloses a photovoltaic power generation system and a fault protection method and device thereof, a combiner box and an inverter, and relates to the technical field of photovoltaic power generation. The system comprises a power conversion unit, a multi-pole linked switch and N photovoltaic group strings, and the method comprises the following steps: under the condition that the photovoltaic power generation system has a fault, controlling a switching tube in the power conversion unit to short-circuit a positive input end and a negative input end of the power conversion unit, controlling the multi-pole linked switch to be switched off, and at most three photovoltaic group strings in the N photovoltaic group strings are connected in parallel. Therefore, when a system has a fault, the positive input end and the negative input end of the power conversion unit are in short circuit, so that the safety of the multi-pole linked switch when the multi-pole linked switch is switched ...

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Номер записи: 4
14-07-2023 дата публикации

Control method and device of grid-connected inverter

Номер: CN116436258A
Автор: YAN JIAWEI, WANG TENGFEI, LI HAITAO, PAN NIAN'AN, CHENG LIN
Принадлежит:

The invention provides a control method and device for a grid-connected inverter. The method comprises the following steps: acquiring a current reference control current and a grid-connected voltage of the grid-connected inverter; determining a compensation current based on the grid-connected voltage, the current closed-loop transfer function information of the grid-connected inverter and the closed-loop output admittance information of the grid-connected inverter; generating a current instruction of the grid-connected inverter according to the compensation current and the reference control current; and controlling the grid-connected inverter through the current instruction to obtain an output current. By applying the method provided by the embodiment of the invention, the reference control current is compensated through the compensation current, the current instruction is generated, and then the output current is obtained through the current instruction, so that the current generated based ...

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Номер записи: 5
16-05-2023 дата публикации

Inverter grid-connected resonance detection method and device, electronic equipment and storage medium

Номер: CN116125177A
Автор: YAN JIAWEI, WANG TENGFEI, LI HAITAO, PAN NIAN'AN, CHENG LIN
Принадлежит:

The invention provides an inverter grid-connected resonance detection method and device, electronic equipment and a storage medium, and the method comprises the steps: analyzing a grid-connected signal, extracting a characteristic signal which can represent whether the inverter grid-connected resonance occurs or not, and judging whether the inverter grid-connected resonance occurs or not according to the characteristic signal, in the whole process, grid-connected current disturbance and the like do not exist, and the grid-connected resonance of the inverter is accurately detected while the quality of the grid-connected current is not influenced.

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Номер записи: 6
11-07-2023 дата публикации

Photovoltaic power generation system and fault protection method and device thereof, combiner box and inverter

Номер: CN116417977A
Автор: ZHANG BING, PAN NIAN'AN, WANG PENG, FENG JIGUI
Принадлежит:

The invention discloses a photovoltaic power generation system and a fault protection method and device thereof, a combiner box and an inverter, and relates to the technical field of photovoltaic power generation. The method comprises the following steps: when a plurality of power conversion units have common positive or common negative power conversion units and protection switch units corresponding to the common positive or common negative power conversion units share protection switches when the protection switch units are connected with corresponding photovoltaic string units, if the photovoltaic power generation system is detected to have a fault, the protection switch units are connected with the corresponding photovoltaic string units; if yes, the plurality of protection switch units are partially disconnected or completely disconnected, so that at most two photovoltaic group strings in the corresponding photovoltaic group string units are connected in parallel, and when the protection ...

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Номер записи: 7
28-07-2023 дата публикации

Grid-connected inverter and overvoltage suppression method thereof

Номер: CN116505543A
Автор: PAN NIAN'AN, ZHANG XIANLI
Принадлежит:

The invention provides a grid-connected inverter and an overvoltage suppression method thereof, and the overvoltage suppression method comprises the steps: controlling the grid-connected inverter to work in a current source mode in a grid-connected manner when the voltage of an AC port of the grid-connected inverter does not exceed a preset threshold value; when the voltage of the alternating current port exceeds a preset threshold value, the grid-connected inverter is controlled to work in a voltage source mode in a grid-connected mode, and reactive current or reactive power output by the alternating current port of the grid-connected inverter is made to respond within a preset duration; controlling the grid-connected inverter to recover a current source mode until the reactive current or the reactive power is greater than or equal to a corresponding preset reactive instruction value; therefore, when transient overvoltage occurs in the power system, transient voltage source characteristics ...

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Номер записи: 8
04-08-2023 дата публикации

Repetitive controller parameter setting method and power converter

Номер: CN116544937A
Автор: WANG JIAXIANG, LI HAITAO, WANG TENGFEI, CHENG LIN, PAN NIAN'AN
Принадлежит:

The invention relates to a repetitive controller parameter setting method and a power converter. The method comprises the following steps: acquiring a parameter setting instruction sent by a user; according to the parameter setting instruction, obtaining a comprehensive performance index value of the harmonic current suppression system based on the repetitive controller under each parameter value combination of the repetitive controller; the comprehensive performance index value is calculated according to the THD value of the system under the parameter value combination corresponding to the comprehensive performance index value and the system stability index value; and selecting a target parameter value combination from the parameter value combinations according to the comprehensive performance index values. According to the parameter setting method and device, due to the fact that the comprehensive performance index values can reflect the THD value and the stability of the system at the ...

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Номер записи: 9