摘要
供热机组参与电网调峰调频是大势所趋。现有的供热机组协调控制系统难以同时满足供热和纯凝两种工况下AGC的控制品质要求,需要分析供热机组特性以找出造成控制品质差异的原因。首先将某抽汽式供热机组的通用简化非线性动态模型小偏差线性化得到传递函数矩阵模型,然后通过分析几个典型工作点的非线性测度和传递函数系数数值总结出机组非线性特性变化规律。研究表明,供热工况下机组控制品质变差主要由供热调节蝶阀对发电负荷这一传递函数在纯凝和供热工况下结构差异造成。这种非线性很难通过整定调节器参数克服,因此需要考虑供热侧对发电的影响,为供热工况重新设计协调控制方案。等供热抽汽流量下机组非线性随发电负荷均匀变化,其规律与纯凝工况相似,可通过DEB等非线性方案克服。
It is the trend in China to enhance the ability of peak load regulation and frequency control by heat supply units. The coordinated control systems in existence can＇t meet the AGC requirements under both pure condensation and heat supply operating conditions. To improve the control performance, analysis of unit characteristics is needed. First, a transfer function matrix model for a heat supply unit is derived by linearizing a simplified nonlinearity dynamic model. Then measures of nonlinearity and coefficients of the transfer functions on several typical operating points are analyzed to derive nonlinearity varying rules. The analysis shows ： control performance deterioration of heat suppIy oper- ating condition is caused by transfer function structure differences of heat supply butterfly valve opening to power load between heat supply and pure condensation operating conditions. This kind of linearity is hard to overcome by regula- tion of controllers, so a new coordinated control scheme considering interactions between heat supply side and power is needed. Under the same extraction flow, units＇ nonlinearity varies evenly with power which is similar to pure conden- sation conditions. This can be solved by nonlinear control methods such as DEB.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2016年第2期66-72,共7页
Journal of North China Electric Power University：Natural Science Edition
基金
国家重点基础研究发展计划项目(973计划)(2012CB215203)
中央高校基本科研业务费专项资金资助项目(2015XS62)
关键词
供热机组
非线性
传递函数
相对非线性测度
特性分析
heat supply units
nonlinearity
transfer function
relative measure of nonlinearity
characteristic analysis
