Page 409 - Sustainable On-Site CHP Systems Design, Construction, and Operations

382 Ca s e S t u d y 5

The Institute of Electrical and Electronic Engineers prepared a generic, but mathe-
matically rigorous reliability study of an idealized radial power system that uses actual
field records of component reliability data gathered by the U.S. Army Corps of Engi-
neers Power Reliability Enhancement Program. Two radial systems are modeled:

1. The first with CHP run in parallel with a typical macrogrid utility (schematic
shown in Fig. 23-3).
2. The second without CHP (schematic not shown, but with the same power chain
architecture of Fig. 23-3 without the continuously operating 13.8-kV gas turbine).

13.8 kV

NC
Utility
Short length of cable Emergency Management
Facility

NC
182.88 m
(600 ft)
cable NC
1000 kVA
NC
generator
91.44 m
(300 ft)
cable
182.88 m (600 ft) cable

NC
Short length of cable
7,500 kVA
13,800 / 480 V
8%
NC

91.44 m (300 ft) cable

Critical operation power
480 V

FIGURE 23-3 Simple radial power system with CHP. [Source: IEEE/ANSI 493-2007 (Ref. 13).]