Energy storage system

Patent metadata

Field	Value
Publication number	US-9859815-B2
Application number	US-201615013848-A
Country	US
Kind code	B2
Filing date	Feb 2, 2016
Priority date	Apr 27, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An energy storage system including a plurality of loads each converting direct current (DC) power stored in a battery thereof into alternating current (AC) power and outputting the AC power, a plurality of slave power controllers detecting zero crossing points of AC voltage signals output from one of the plurality of loads and controlling the plurality of loads in accordance with a control signal received from a master power controller, and the master power controller controlling the plurality of slave power controllers so as to control the plurality of loads in accordance with the control signal received from the master power controller after a preset time has lapsed since the detected zero crossing point.

First claim

What is claimed is:

1. An energy storage system comprising:
a plurality of loads each converting direct current (DC) power stored in a battery thereof into alternating current (AC) power and outputting the AC power;
a plurality of slave power controllers detecting zero crossing points of AC voltage signals output from one of the plurality of loads and controlling the plurality of loads in accordance with a control signal received from a master power controller; and
the master power controller controlling the plurality of slave power controllers so as to control the plurality of loads in accordance with the control signal received from the master power controller after a preset time has lapsed since the detected zero crossing point.

2. The energy storage system of claim 1 , wherein the plurality of slave power controller are synchronized based on the zero crossing points of the AC voltage signals output from the plurality of loads.

3. The energy storage system of claim 1 , wherein the preset time is 90°, 180°, 270°, or 360°.

4. The energy storage system of claim 1 , wherein the plurality of slave power controllers output Pulse Width Modulation (PWM) signals to the plurality of loads in accordance with the control signal received from the master power controller.

5. The energy storage system of claim 1 , wherein the plurality of slave power controllers periodically detect the zero crossing points.

6. The energy storage system of claim 5 , wherein the plurality of slave power controllers comprise a Central Processing Unit (CPU) which detects a period of time which has lapsed since the detection of the zero crossing points.

7. The energy storage system of claim 6 , wherein the CPU periodically transmits the periodically detected zero crossing points to the master power controller.

8. The energy storage system of claim 7 , wherein the master power controller periodically outputs the control signal based on the periodically transmitted zero crossing points.

Assignees

• Lsis Co Ltd

Inventors

• Shim Jae Seong

Classifications

• H02J13/1313

  using pulsed signals · CPC title

• H02J13/1311

  using the power network as support for the transmission · CPC title

• H02J13/1315 Primary

  using modification of a parameter of the network power signal · CPC title

• H02J3/32 Primary

  using batteries or super capacitors with converting means · CPC title

• Y04S10/14

  Energy storage units · CPC title