Power Generation System

Patent metadata

Field	Value
Publication number	US-2023163597-A1
Application number	US-202217903756-A
Country	US
Kind code	A1
Filing date	Sep 6, 2022
Priority date	Sep 8, 2021
Publication date	May 25, 2023
Grant date	—

Abstract

This application provides a power generation system. The power generation system may include an integration system and a power transformation system. The integration system may include a plurality of inverters and a plurality of first switches. The plurality of inverters are connected in series to the plurality of first switches in a one-to-one correspondence. Each inverter converts a direct current from a direct current power supply into an alternating current, and outputs the alternating current to a corresponding first switch. Alternating currents of the plurality of first switches from corresponding inverters are combined and output to the power generation system, and the plurality of inverters and the power transformation system are isolated from each other. The power transformation system adjusts a voltage value of the combined alternating current and outputs the voltage value to a power grid.

First claim

1 - 20 . (canceled)

21 . A system, comprising an integration system and a power transformation system, wherein
the integration system comprises a direct current input terminal and a first alternating current output terminal, and the power transformation system comprises an alternating current input terminal and a second alternating current output terminal; the direct current input terminal is connected to a plurality of direct current power supplies, the first alternating current output terminal is connected to the alternating current input terminal, and the second alternating current output terminal is connected to a power grid; the integration system comprises a plurality of inverters and a plurality of first switches, and the plurality of inverters are connected in series to the plurality of first switches in a one-to-one correspondence; an input terminal of each inverter of the plurality of inverters is connected to a corresponding direct current power supply in the plurality of direct current power supplies, and an output terminal of each inverter is connected to a first terminal of a corresponding first switch; each inverter is configured to convert a direct current from the corresponding direct current power supply into an alternating current, and to output the alternating current to the corresponding first switch; the plurality of first switches are configured to combine alternating currents from corresponding inverters, output a combined alternating current to the power transformation system, and isolate the plurality of inverters from the power transformation system; and the power transformation system is configured to adjust a voltage value of the combined alternating current and output the voltage value to the power grid.

22 . The system according to claim 21 , wherein the corresponding first switch is configured to:
when an inverter connected to the corresponding first switch is faulty or the system is faulty, turn off based on a first control instruction.

23 . The system according to claim 21 , wherein the integration system further comprises a plurality of second switches, and the plurality of second switches are connected in series to the plurality of inverters in a one-to-one correspondence;
one terminal of each second switch of the plurality of second switches is connected to a corresponding direct current power supply, and the other terminal of each second switch is connected to the input terminal of a corresponding inverter; and each second switch is configured to isolate the corresponding direct current power supply from the corresponding inverter.

24 . The system according to claim 23 , wherein each second switch is configured to:
when the corresponding direct current power supply connected to a second switch is faulty or the corresponding inverter connected to the second switch is faulty, turn off based on a second control instruction.

25 . The system according to claim 23 , wherein each second switch is connected to the corresponding direct current power supply using a first bonding conductor.

26 . The system according to claim 25 , wherein the first bonding conductor comprises a direct current cable.

27 . The system according to claim 25 , wherein the integration system further comprises a plurality of surge protection devices; and
each surge protection device of the plurality of surge protection devices is connected to a corresponding first bonding conductor.

28 . The system according to claim 27 , wherein each surge protection device is a lightning arrester or a surge protector.

29 . The system according to claim 23 , wherein each second switch is a direct current switch.

30 . The system according to claim 29 , wherein the direct current switch is a direct current circuit breaker or a direct current fuse.

31 . The system according to claim 21 , wherein the power transformation system comprises a first isolation module, a transformer, and a second isolation module;
an input terminal of the first isolation module is connected to a second terminal of each first switch, an output terminal of the first isolation module is connected to an input terminal of the transformer, an output terminal of the transformer is connected to an input terminal of the second isolation module, and an output terminal of the second isolation module is connected to the power grid; the first isolation module is configured to transmit an alternating current transmitted by each first switch to the transformer, and isolate the integration system from the transformer; the transformer is configured to adjust an alternating current output from the first isolation module, and output an adjusted alternating current to the second isolation module; and the second isolation module is configured to transmit the adjusted alternating current to the power grid, and isolate the transformer from the power grid.

32 . The system according to claim 31 , wherein the transformer is a pillow transformer or a corrugated transformer.

33 . The system according to claim 21 , wherein the integration system further comprises a second bonding conductor;
second terminal(s) of one or more first switches are connected to the second bonding conductor; and the second bonding conductor is configured to combine alternating current(s) from the one or more first switches.

34 . The system according to claim 33 , wherein the alternating current input terminal of the power transformation system is connected to the second bonding conductor through a third bonding conductor.

35 . The system according to claim 34 , wherein the third bonding conductor is a soft connection busbar.

36 . The system according to claim 21 , wherein each inverter is a string inverter.

37 . The system of claim 21 , wherein each first switch is an alternating current switch.

38 . The system according to claim 37 , wherein the alternating current switch is an alternating current circuit breaker or an alternating current fuse.

39 . The system according to claim 21 , wherein each direct current power supply comprises a photovoltaic module means;
the photovoltaic module means comprises a plurality of photovoltaic modules and a combiner box; an output terminal of each photovoltaic module of the plurality of photovoltaic modules is connected to an input terminal of the combiner box, and an output terminal of the combiner box is connected to the input terminal of a corresponding inverter; and the combiner box is configured to combine direct currents generated by the plurality of photovoltaic modules, and output a combined direct current to the corresponding inverter.

40 . The system according to claim 21 , wherein each direct current power supply comprises an energy storage battery.

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Zhou Peng
• Pan Haiyang
• Zhao Yazhu

Classifications

• H02J2101/24

  Photovoltaics · CPC title

• H02J3/001

  Arrangements for handling faults or abnormalities, e.g. emergencies or contingencies · CPC title

• H02J1/102 Primary

  being switching converters (H02J1/108, H02J1/12 take precedence) · CPC title

• H02M7/42

  Conversion of DC power input into AC power output without possibility of reversal · CPC title

• H02J3/381 Primary

  Dispersed generators · CPC title