摘要
提出了火电厂热力系统动态优化模型,用于实时分析热力系统的能损分布,确定动态优化方案。对凝汽式汽轮机绝对内效率的计算方法进行了改进以适应实时机组性能分析的需要。将热力系统的优化问题和辅助循环能损分析分开处理。热力系统结构矩阵的逆矩阵本质上是热力系统流量分布矩阵。文中给出了主循环流量分布的计算方法,并以热力系统主循环作为优化分析和能损分析的基础,用虚变化来研究主循环参数变化对主循环热效率的影响,给出了主循环热效率随主循环参数变化的计算公式。选择能够使主循环效率增加的参数组合,能使主循环效率在机组变工况条件下不断地逼近最优工况,实现最优运行。能损分析可动态地确定辅助循环的损失分布。
A dynamic optimization model of thermal system in a thermal power plant is proposed to analyze real- time energy loss distribution in the system, and to solve its dynamic optimization. Calculation method of absolute efficiency of steam turbine is improved in order to meet the demand of online calculation and performance analysis. The problem of optimization for its main cycle is different from the problem of analysis of its energy loss distribution in the new model. Converse matrix of structure matrix of thermal system is a matrix of flow distribution of thermal system in nature. Based on main cycle of the system, a group of equations are conducted to calculate the changes of its main cycle efficiency when parameters of its main cycle go through virtual processes. Optimum performance of thermal system can be approached gradually by choosing composition of controllable parameters that can improve the real-time efficiency of main cycle. Energy loss distribution of auxiliary cycles of the system can be determined dynamically.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第4期217-220,共4页
Proceedings of the CSEE
