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Abstract
The authors provide a computationally simple and efficient methodology of evaluating the quality index of a thermal power plant (TPP) and of selecting best-quality TPP. The methodology is based on graph theory, matrix algebra, and permanent models, and this takes into account the complexities and interactions of various characteristics of the TPP. The various conflicting parameters of the TPP and their interactions/interconnections are identified and represented by the variable quality characteristic matrix (VCM-ss) and connectivity characteristic matrix (VCM-c). The permanent model yields the quality index of the TPP, which is a permanent value of the TPP quality permanent matrix (VPM-q). The qualitative analysis of the quality of a TPP through quality index is proposed by means of conventional and fuzzy set theories. The method permits analysis and comparison of design as well as the operating state of the system. The quality index is a useful aid for designers in the selection of a suitable TPP based on requirements. The methodology is explained with an example.
Key Words
Quality evaluation, graph theory, power plants, quality evaluation
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1. Introduction
Thermal power plants are currently undergoing substantial regulatory and organizational changes. Such changes encourage competition and efficiency in electric power operation and planning. Under these circumstances, customers' satisfaction with the power supply will greatly influence a utility's competitive position;hence it is highly desirable that the utilities find ways to reflect customer satisfaction in their operation and planning. The prime objective of power generation is to satisfy customers' needs economically with emphasis on technical safety, reliability, and quality.
"Quality" can be defined in many ways. Crosby [1] defines it as meeting requirements and says the only true measure of quality is through the cost of quality. Deming [2] suggests that quality is a triangle involving the interaction of the product, the customer, and the way he or she uses the product and his or her training. The Malcolm Baldrige National Quality Award [3] defines "quality" as meeting customers' expectations. Juran [4] stated that "quality" means fitness for use, which is parameterized by the dimensions of the quality and is measured by quality characteristics. Gravin [5] outlined eight dimensions of quality. Graph theory [6] has been applied extensively in various disciplines to evaluate...