US 11,381,087 B2Granted

Smart grid system and power management method thereof

AssigneeDelta Electronics, Inc.

InventorsSin-Hong Chen, Tsung-Han Tsai, Xin-Hung Lin

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Abstract

A smart grid system includes a current sensor, and plural power conversion devices coupled to an AC grid. The current sensor measures a total current flowed through the AC grid, thereby providing a measured current value. The power conversion devices include a master power conversion device and plural slave power conversion devices. The master power conversion device receives the measured current value, thereby controlling an output power of the master power conversion device and providing a first duty cycle signal according to the measured current value. A first one of the slave power conversion devices which is coupled to the master power conversion device receive the first duty cycle signal, thereby controlling an output power of the first one of the slave power conversion devices according to the first duty cycle signal. The master power conversion device and the slave power conversion devices are communicated via a daisy chain connection.

Claims20

Dependent claims

A smart grid system, applied to a load and an AC grid, wherein the smart grid system comprises:

a current sensor configured to measure a total current flowed through the AC grid and to correspondingly provide a measured current value;
and
a plurality of power conversion devices coupled to the AC grid and configured to supply power to the load, wherein the power conversion devices comprise:
a master power conversion device configured to receive the measured current value, wherein the master power conversion device controls an output power of the master power conversion device and provides a first duty cycle signal according to the measured current value;
and
a plurality of slave power conversion devices, wherein a first one of the slave power conversion devices which is coupled to the master power conversion device is configured to receive the first duty cycle signal, wherein the first one of the slave power conversion devices controls an output power of the first one of the slave power conversion devices according to the first duty cycle signal;
wherein the master power conversion device and the slave power conversion devices are communicated via a daisy chain connection.

4 more elements

A power management method of a smart grid system, comprising:

measuring a total current flowed through a AC grid to provide a measured current value;
receiving the measured current value through a master power conversion device of a plurality of power conversion devices coupled to the AC grid, wherein the master power conversion device controls an output power of the master power conversion device and provides a first duty cycle signal according to the measured current value;
and
receiving the first duty cycle signal through a first one of a plurality of slave power conversion devices of the power conversion devices which is coupled to the master power conversion device, wherein the first one of the slave power conversion devices controls an output power of the first one of the slave power conversion devices according to the first duty cycle signal;
wherein the power conversion devices are configured to supply power to a load, wherein the master power conversion device and the slave power conversion devices are communicated via a daisy chain connection.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/023,408Filed 17 Sep 2020
Priority: CN 202010144066.34 Mar 2020
Published: US 2021/0281075 A19 Sep 2021
Granted: 5 Jul 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02J 3/38
Circuit arrangements for AC mains or AC distribution networks: arrangements for feeding a single network from two or more generators or sources in…
H02J 3/46
Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised…
H02M 7/48
By static converters: using discharge tubes with control electrode or semiconductor devices with control electrode
H02J 3/381
Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised…