Optimal operation and time recursion analysis of two-speed circulating water pump unit

MA Jie1， SUN Yong-ping2， SHENG De-ren1， WU Wen-jian2， LI Wei1， CHEN Jian-hong1
（1. Institute of Thermal Science and Power System， Zhejiang University， Hangzhou 310027， China；
 2. Electric Power Research Institute， Zhejiang Electric Power Corporation， Hangzhou 310014， China）

Abstract： Aiming at solving the problems of the optimization of two-speed circulating water pump unit，an optimization model of the cold end system under the simulation working condition was investigated with the analysis of the general features of power income and expense income in a certain circulating water inlet temperature，different load and different water circulating pump operation. Otherwise，to avoid the frequency of water pump's powering on，powering off and switching between high and low speed，a time recursion optimization model was put forward，which can predict the optimal operation mode a day after using the comprehensive power income and expense income the day before. Taking a 600 MW power plant as an example，it was caculated using these two models. The results indicate that the comprehensive power income is up to 1 699.39 kW and the comprehensive expense income is up to 658.26 Yuan per hour.
Key words： circulating water system； two-speed pump； optimization； time recursion