Method for driving emergency generator using energy storage system

• US 9,520,818 B2
• Filed: 07/29/2013
• Issued: 12/13/2016
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Hyosung Heavy Industries Corporation
• Original Assignee: Hyosung Corporation
• Inventors: Seo, Young Ger, Lee, Jeong Min, Lee, Jin Hee
• Primary Examiner(s): Cuevas, Pedro J
• Application Number:
  US14/417,689
• Publication Number:
  US 20150288307A1
• Time in Patent Office: 1,233 Days
• Field of Search: 322/36, 290/1.A
• US Class Current: 1/1
• CPC Class Codes: H02J 3/06 Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
• CPC Class Codes: H02J 9/06 with automatic change-over , e.g. UPS systems
• CPC Class Codes: H02P 9/02 Details of the control

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

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.

2. 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.

3. 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.

4. 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.

5. 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.