Defusing of IEEE 1547: Standard for Interconnecting Distributed Resources

Hi,
The IEEE 1547 standard on DERs has some major flaws such as tight underfrequency disconnection settings at 59.3 Hz (99% f_set).
http://en.wikipedia.org/wiki/IEEE_1547#Risk_of_System_Disturbance Plus, there is an overfrequency disconnetion threshold at 60.5 Hz.
In Germany, a similar problem occured (the so called 50.2 Hz problem). The answer was to implement a droop like power reduction begining with 50.2 Hz. +200 mHz were chosen because that's the normal bandwith for primary control (frequency response of generators: P(f)). When the "normal" Hz range is left, then at more than +200 Hz deviation *all* units begin to work in emergy mode.
My question is where this "usual" frequency band is in the US - that is the frequency bandwith within frequency response of generators is available +- 200 mHz, +- 250 mHz or 300 mHz?
Regards,
Gunnar
--
/^\
\ / Plain-Text Ribbon Campain
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.