Study on Control Reserve Assessment of Thermal Power Plants.

(Analysis of a Controllability and an Additional Expenditure of Coal-fired Power Plants applying a classification of the Flexibility.)

Abstract

This report sorts out the indices of performances and additional expenditures of power balancing operation of thermal power plant during the massive introduction of intermittent renewable energies. The efficiency of the 700MW class coal fired power plant during the partial load operation and throttle valve control operation is calculated by the material and heat balance analysis; the calculated efficiency is applied to the basic performance of the coal fired power plant in the demand – supply balance analysis. By applying the indices of the low load LFC, Load Frequency Control, performance the demand- supply balance of the supposed balancing group (IEEJ standard model, AGC30 model) is analyzed. In the case that the coal power plant is operated within the low load condition, LFC ability is performed by the throttle control operation; the throttle control is responsible for the possible failure of the plant. The expenditure of substituting the failure of LFC of coal plant is calculated. The substitution by the LNG steam cycle plant consumes much amount of fuel gas compared to the case that the GTCC is selected as the substitution.