Comprehensive Energy-saving Evaluation of Thermal Power Plants Based on TOPSIS Gray Relational Projection and the Weight Sensitivity Analysis

According to the characteristics of energy-saving assessment in thermal power plant, a comprehensive gray relation projection evaluation method based on ideal point was proposed by introducing the TOPSIS, gray correlation theory and vector projection method to the unit performance evaluation. Meanwhile, the weight of evaluation index was determined by combining the Delphi with sequence synthesis technique using combination weighting method, so as to improve the scientific level and objectivity of energy-saving assessment for thermal power plant. Above methods were applied to the comprehensive evaluation of five 600 MW units, while a sensitivity analysis of the subjective weights was carried out. Results show that the indicator of both the economy and reliability is still dominant in the unit comprehensive evaluation; the model of gray relation projection evaluation based on TOPSIS is able to quantitatively evaluate the energy-saving status with high evaluation robustness, which therefore may serve as a reference for energy saving of relevant power plants.