Research And Application Of Coordinated Optimal Control Strategy For 330MW Heating Unit

Electric power plays an extremely important role in the development of China’s national economy,among which thermal power generation is still the main mode of electric power production in China.It is occupying and consuming a large number of coal resources.It is of great significance to study the economic operation of thermal power plants,improve the energy conversion efficiency of the power production process and reduce the coal consumption in the production process to enhance the core competitiveness of enterprises.Coordinated control system is an important part of power plant automatic control system,with the increasing of unit capacity and the requirement of power grids for the load regulation performance of each unit,the demand of coordinated control system for coal-fired power units is getting higher and higher,coordinated control systems have become the core of modern automatic control in thermal power plant.Combining the engineering practice case of 2×330 MW subcritical heating unit control in Jiangsu Huaiyin power generation Co,LTD,this study comprehensively optimizes the basic functions and control strategies introduced in the 330 MW heating unit are optimized,and some control problems currently existing in enterprise are effectively dealt with.At the same time,this study improves the automatic monitoring level of the 330 MW heating unit to a certain extent,and provides feasible suggestions for the improvement of the control strategy of the same type of heating unit in China.Specifics as follows:The task of composition and operation mode of the coordinated control system are described.At the same time,the function and technical indicators of primary frequency modulation,the function of automatic power generation control(AGC),and the function of rapid load reduction(RB)are analyzed.The traditional coordinated control strategy is analyzed,and the existing problems of the traditional coordinated control system are summarized.The main problems include: the control system cannot adapt to the changes of coal species and cannot effectively eliminate disturbances.On the basis,according to the specific characteristics of Huaiyin power generation Company,Co.,Ltd.,2 x 330 MW subcritical heating unit,and using advanced control technologies such as predictive control and neural networks,a coordinated and optimized control plan for 330 MW sub-critical heating units based on advanced control technology is proposed.The advanced coordinated control system and related control technology are analyzed.This paper introduces the field implementation process of the advanced coordination and optimization control system,and expounds the software and hardware characteristics of the optimized control system and the advantages of the optimization platform.Taking the # 3 unit of Huaiyin Power Generation Co.,Ltd.as the object,the advanced coordination and optimization system was applied to the field practice,and CCS variable load test,AGC variable load test and one frequency modulation performance test were carried out.The performance test results were analyzed in this paper.The application results show that the advanced coordination and optimization control system can effectively improve the load varying ability and the peak and frequency adjusting modulation ability of the unit,obviously reduce the fluctuation of the key operating parameters of the unit during the load varying process,and achieve the stability and economic operation of the unit.In this paper,the RB field test is carried out for the unit in seven working conditions.The RB control logic and test results are analyzed in this paper.