Page 61 - Mathematical Models and Algorithms for Power System Optimization

Optimization of Annual Generator Maintenance Scheduling 51

An approach based on the generalized ES and fuzzy constraints is proposed in this chapter. In
this approach, users can define the rules of the ES with generalized construction. The
constraints of a GMS problem are represented by fuzzy membership functions. A new GMS
program based on this approach has been developed that fully considers the special
requirements of different systems.
The generator capacity scale of a provincial power system used in this study is shown in
Table 3.1, totaling 4 areas, 9 power plants, and 55 generating units, with a total installed
capacity of 4083MW, and the unit capacity of the 55 generating units ranging from 12 to
350MW; the relation of annual load curve and total installed capacity is shown in Fig. 3.1. The
maximum difference between the annual load curve (only step points are given) and total

Table 3.1 Capacity scale of generator
Unit Capacity (MW) Number of Units Total Capacity (MW)

12 14 168
12.5 2 25
25 14 350
40 1 40
50 10 500
100 2 200
200 9 1800
300 1 300
350 2 700
Total 55 4083

Load (MW)
Installed capacityʢMWʣ

Fig. 3.1

Relation between annual load curve and total installed capacity.