【摘要】 汽轮机阀门流量特性与实际流量特性不符合,会影响机组负荷控制精度和一次调频能力。在测得实际流量特性的基础上,介绍了两种汽轮机阀门流量特性的优化方法,对测得的流量特性曲线进行主汽压力与温度的修正,修正后用Savitzky-Golay算法进行数据处理,并利用最小二乘法优化算法进行曲线拟合。以某电厂300MW机组为例,对其在顺序阀方式下出现负荷突变和调节缓慢的问题进行优化分析和仿真验证,优化后机组负荷与主蒸汽流量曲线获得了良好的连续性和线性度,提高了机组负荷控制精度及一次调频、AGC的合格率,优化分析具有较好的技术意义和实用性。更多还原

【Abstract】 That the flow characteristic of valve is not correspondent with practice,will affect the accuracy of load control and the ability of primary frequency.On the basis of the real flow charateristic mearsured practically,this paper introduces two optimization methods of flow characteristic of valves in steam turbine.Correction coefficients of main steam pressure and temperature is used for the characteristic curve.Savitzky-Golay method can be used for date processing.And least squre method is carried on curve fitting.For the problem of load mutation and slow regulation of flow characteristic of high-pressure governor valve,existed on one 300MW steam turbine of a certain power plant in sequence valve operation mode,optimum analysis and simulation verification has been carried out.The optimization results show that the curve between load and main steam flow has favorable continuity and linearity after optimization,which improve the accuracy of load contrlo and the qualified rate to primary frequency and AGC.This analysis has good technical significance and practicality.更多还原