Power supply system and control device

Patent metadata

Field	Value
Publication number	US-11146064-B2
Application number	US-201916702816-A
Country	US
Kind code	B2
Filing date	Dec 4, 2019
Priority date	Jun 7, 2017
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A power supply system includes a plurality of power conversion devices, a plurality of breakers, and a controller. The plurality of breakers are respectively connected to the plurality of power conversion devices and configured to perform switching of an electrical connection between the power conversion device and a power system, wherein the breaker switches an ON state and an OFF state. The controller is configured to control the breakers and switch connection states of the plurality of power conversion devices are switched, and the controller being configured to determine whether or not the connected breaker is in an ON state and electrically conducted to the power system and the number of the power conversion devices in a standby state reaches a predetermined number.

First claim

What is claimed is:

1. A power supply system comprising:
a plurality of power conversion devices;
a plurality of breakers respectively connected to the plurality of power conversion devices and configured to perform switching of electrical connections between the power conversion devices and a power system, wherein the breaker switches between an ON state and an OFF state; and
a controller configured to control the plurality of breakers and switch connection states of the plurality of power conversion devices, and the controller being configured to determine whether or not the number of the power conversion devices, which are electrically connected to the power system via the connected breaker in an ON state, and in a standby state, reaches a predetermined number,
wherein, when the number of the power conversion devices in the standby state is the predetermined number, harmonic components flowing from the power system are amplified due to the resonance in the power conversion devices.

2. The power supply system according to claim 1 , wherein the controller controls the plurality of breakers and changes the number of the power conversion devices in the standby state, if the controller determines that the number of the power conversion devices in the standby state reaches the predetermined number.

3. The power supply system according to claim 1 , wherein the controller controls the plurality of power conversion devices and places the power conversion devices in the standby state into an operating state, if the controller determines that the number of the power conversion devices in the standby state reaches the predetermined number.

4. A power supply system comprising:
a plurality of power conversion devices;
a plurality of breakers respectively connected to the plurality of power conversion devices and configured to perform switching of an electrical connection between the power conversion device and a power system, wherein the breaker switches an ON state and an OFF state;
a detection device configured to detect at least one of a harmonic voltage and a current of harmonic affecting the power system;
a controller configured to control the breakers and switch connection states of the plurality of power conversion devices, and determine whether or not an intensity of the harmonic voltage or the current of harmonic detected by the detection device is equal to or greater than a predetermined value.

5. The power supply system according to claim 4 , wherein when the controller determines that the intensity of the harmonic voltage or the current of harmonic detected by the detection device is equal to or greater than a predetermined value, the controller controls the breakers so that the number of the power conversion devices in the standby state is changed.

6. The power supply system according to claim 4 , wherein when the intensity of the harmonic voltage or the current of harmonic detected by the detection device is equal to or greater than a predetermined value, the controller controls the breakers so that the power conversion devices in the standby state into an operating state.

7. The power supply system according to claim 6 , wherein the controller instructs other power conversion devices that are in an operating state to reduce an active power output by the power conversion device that has been changed from the standby state to the operating state.

8. The power supply system according to claim 7 , wherein the controller instructs the other power conversion devices that are in an operating state to reduce a reactive power output by the power conversion device that has been changed from the standby state to the operating state.

9. The power supply system according to claim 4 , further comprising:
one or a plurality of filter circuits in parallel to the plurality of power conversion devices with respect to the power system.

10. The power supply system according to claim 9 , further comprising:
a filter connection device configured to change a connection state between the power system and the filter circuit,
wherein the controller is configured to change the connection state of the filter connection device when the number of the power conversion devices in the standby state reaches a predetermined number or when an intensity of the harmonic voltage or the current of harmonic detected by the detection device that detects at least one of the harmonic voltage d the current of harmonic is equal to or higher than a predetermined value.

11. The power supply system according to claim 4 , further comprising:
a display unit configured to display at least one of the harmonic voltage and the current of harmonic affecting the power system.

12. The power supply system according to claim 4 , wherein the controller controls the breakers so that the number of plurality of power conversion devices in an operating state does not reach a predetermined number in which harmonic resonance occurring in the power system occurs when the power conversion device enters the operating state, such that the number of the power conversion devices is adjusted.

13. A power supply system comprising: a plurality of power conversion devices; and a plurality′ of breakers respectively connected to the plurality′ of power conversion devices and configured to perform switching of an electrical connection between the power conversion device and a power system, wherein the breaker switches an ON state and an OFF state, wherein a connection of the plurality of breakers is switched so that the number of the power conversion devices in a standby state does not reach a predetermined number, wherein, when the number of the power conversion devices in the standby state is the predetermined number, harmonic components flowing from the power system side are amplified due to the resonance in the power conversion device.

14. A control device comprising: a connection terminal connected to a plurality of breakers, the breakers being respectively connected to a plurality of power conversion devices and configured to perform switching of an electrical connections between the power conversion device and a power system, wherein the breaker switches between an ON state and an OFF state; and a controller configured to control the plurality of breakers via the connections terminal and switch connection states of the plurality of power conversion devices, and determine whether or not the number of the power conversion devices in a standby state reaches a predetermined number, wherein, when the number of the power conversion devices in the standby state is the predetermined number, harmonic components flowing from the power system side are amplified due to the resonance in the power conversion device.

Assignees

• Toshiba Kk
• Toshiba Energy Systems & Solutions Corp

Inventors

• Kawachi Shunsuke
• Mizutani Mami
• Tanno Tsutomu
• Hashimoto Tatsuya
• Ogura Yasuhiro
• Yabui Ken

Classifications

• H02J2101/28

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• H02J2101/24

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• H02J3/01 Primary

  Arrangements for reducing harmonics or ripples · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title

• H02J3/381 Primary

  Dispersed generators · CPC title