# US 9,520,818 B2 · Method for driving emergency generator using energy storage system

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- Number: US 9,520,818 B2
- Document ID: US9520818B2
- Status: Granted
- Kind: B2
- Application number: 14/417,689
- Filed: 2013-07-29
- Published: 2015-10-08
- Granted: 2016-12-13
- Earliest claimed: 2012-07-27
- Assignees: Hyosung Corporation
- Applicants: Hyosung Corporation
- Inventors: Young Ger Seo; Jeong Min Lee; Jin Hee Lee
- Web page: https://patentgrep.com/patent/US9520818B2

## CPC

- H02P 9/02: Details {of the control}
- H02J 3/06: Controlling the transfer of power between connected networks; Controlling load sharing between connected networks
- H02J 9/06: with automatic change-over {, e.g. UPS systems}
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

The present invention relates to a method for driving an emergency generator using an energy storage system in which, when the power of an emergency generator is applied, an energy storage system is allowed to handle the load demand, thereby driving the emergency generator at maximum efficiency. For this purpose, the method for driving an emergency generator using an energy storage system (ESS), including, after an emergency generator has been applied and until the emergency generator reaches a preset maximum efficiency driving state, handling, by an ESS, load demand using previously stored power, and, when the emergency generator reaches the preset maximum efficiency driving state, maintaining the driving of the emergency generator in the maximum efficiency driving state.

## Claims

### Claim 1

A method for driving an emergency generator using an energy storage system (ESS) in a power supply system, in which the ESS and the emergency generator are installed between a commercial power source and a plurality of loads, comprising the following steps:
applying the emergency generator when a supply of power is shut off;
driving the emergency generator at a preset maximum driving efficiency even though an amount of generated power of the emergency generator is smaller or larger than a load demand; and
maintaining driving of the emergency generator in a maximum efficiency driving state, although the load demand is variable while driving the emergency generator at the preset maximum driving efficiency,
wherein the ESS handles an amount of power corresponding to a difference between the variable load demand and the amount of power generated by the emergency generator.

### Claim 2 (depends on 1)

The method of claim 1, wherein after the emergency generator has been applied, a connected state between the emergency generator and one or more loads is continuously maintained.

### Claim 3 (depends on 1)

The method of claim 1, wherein handling, by the ESS, the load demand comprises, if an amount of generated power of the emergency generator is smaller than the load demand, supplying at least an amount of power equal to or larger than a difference between the amount of generated power and the load demand to one or more loads using the power previously stored in the ESS.

### Claim 4 (depends on 1)

The method of claim 1, wherein handling, by the ESS, the load demand comprises, if an amount of generated power of the emergency generator is larger than the load demand, storing surplus power, attributable to the amount of generated power, in the ESS.

### Claim 5 (depends on 3)

The method of claim 3, wherein handling, by the ESS, the load demand comprises, if an amount of generated power of the emergency generator is larger than the load demand, storing surplus power, attributable to the amount of generated power, in the ESS.