Editing Energy management system

{{Short description|A system of computer-aided tools}}
{{Refimprove|date=February 2024}}

{{for|energy management at the building level|Energy management system (building management)}}
An '''energy management system''' ('''EMS''') is a system of computer-aided tools used by operators of electric [[public utility|utility]] [[electric power transmission|grids]] to monitor, control, and optimize the performance of the [[electricity generation|generation]] or [[electric power transmission|transmission system]]. Also, it can be used in small scale systems like [[microgrid]]s.<ref>{{Cite journal|title=Communication Based Control for DC Microgrids – IEEE Journals & Magazine|journal=Publications and Research |date=8 January 2018 |language=en-US|doi=10.1109/TSG.2018.2791361|s2cid=67870651|url=https://academicworks.cuny.edu/cc_pubs/589|last1=Saleh |first1=Mahmoud |last2=Esa |first2=Yusef |last3=Mohamed |first3=Ahmed |doi-access=free }}</ref><ref>{{Cite journal|title=Energy management algorithm for resilient controlled delivery grids – IEEE Conference Publication|journal=Publications and Research |date=October 2017 |language=en-US|doi=10.1109/IAS.2017.8101777|s2cid=25847292|url=https://academicworks.cuny.edu/cc_pubs/637|last1=Saleh |first1=Mahmoud |last2=Esa |first2=Yusef |last3=Mohamed |first3=Ahmed |last4=Grebel |first4=Haim |last5=Rojas-Cessa |first5=Roberto |url-access=subscription }}</ref> 

==Terminology==
The computer technology is also referred to as [[SCADA]]/EMS or EMS/SCADA. In these respects, the terminology EMS then excludes the monitoring and control functions, but more specifically refers to the collective suite of power network applications and to the generation control and scheduling applications.

Manufacturers of EMS also commonly supply a corresponding [[dispatcher training simulator]] (DTS). This related technology makes use of components of SCADA and EMS as a training tool for control center operators.

==Operating systems==
Up to the early 1990s it was common to find EMS systems being delivered based on proprietary [[Computer hardware|hardware]] and [[operating system]]s. Back then EMS suppliers such as [[Harris Corporation|Harris Controls]] (now [[General Electric|GE]]), [[Hitachi]], [[Cebyc]], [[Control Data Corporation]], [[Siemens]] and [[Toshiba]] manufactured their own proprietary hardware. EMS suppliers that did not manufacture their own hardware often relied on products developed by [[Digital Equipment]], [[Gould Electronics]] and [[MODCOMP]]. The VAX 11/780 from Digital Equipment was a popular choice amongst some EMS suppliers. EMS systems now rely on a model based approach. Traditional planning models and EMS models were always independently maintained and seldom in synchronism with each other. Using EMS software allows planners and operators to share a common model reducing the mismatch between the two and cutting model maintenance by half. Having a common user interface also allows for easier transition of information from planning to operations.

As proprietary systems became uneconomical, EMS suppliers began to deliver solutions based on industry standard hardware platforms such as those from [[Digital Equipment]] (later [[Compaq]], then [[Compaq|HP]]), [[IBM]] and [[Sun Microsystems|Sun]]. The common operating system then was either DEC [[OpenVMS]] or [[Unix]]. By 2004, various EMS suppliers including [[Alstom]], [[ABB Asea Brown Boveri|ABB]] and [[Open Systems International|OSI]] had begun to offer Windows based solutions. By 2006 customers had a choice of [[UNIX]], [[Linux]] or [[Microsoft Windows|Windows]]-based systems. Some suppliers including ETAP, NARI, PSI-CNI and Siemens continue to offer UNIX-based solutions. It is now common for suppliers to integrate UNIX-based solutions on either the Sun [[Solaris (operating system)|Solaris]] or IBM platform. Newer EMS systems based on [[blade server]]s occupy a fraction of the space previously required. For instance, a blade rack of 20 servers occupy much the same space as that previously occupied by a single [[MicroVAX]] server.

==See also==
* [[Energy accounting]]
* [[Energy conservation measure]]
* [[Energy management]]
* [[Energy management software]], software to monitor and optimize energy consumption in buildings or communities
* [[Energy storage as a service]] (ESaaS)
* [[Load management]] for balancing the supply of electricity on a distribution network.

==References==
{{Reflist}}

==Further reading==
* EPRI (2005) Advanced Control Room Energy Management System: Requirements and Implementation Guidance. Palo Alto, CA. EPRI report 1010076.
* EEMUA 191 Alarm Systems – A Guide to Design, Management and Procurement (1999) {{ISBN|0-85931-076-0}}
* ASM Consortium (2009) – Effective Alarm Management Practices {{ISBN|978-1-4421-8425-1}}
* ANSI/ISA–18.2–2009 – Management of Energy Systems for the Process Industries
* [[IEC 62682]] Management of Energy systems for the process industries

{{DEFAULTSORT:Energy Management System}}
[[Category:Electric power transmission systems]]
[[Category:Management systems]]
[[Category:Management cybernetics]]