摘要
参与深度灵活性调峰的热电机组在原有低压缸进汽阀基础上增加旁路阀,以达到切缸后低压缸保持最低流通量的目的。某电厂350 MW机组切缸工艺改造后,利用切缸旁路阀行程小、调节动作迅速、小流量控制精度高的特点,通过理论计算确定旁路阀开度变化与电负荷变化的关系,设计了旁路阀辅助电厂调频的自动控制方案与控制逻辑,并进行MATLAB控制仿真,将相应组态方案导入机组分散控制系统(DCS)进行试验验证。试验结果表明,切缸旁路阀辅助调频自动控制方案能有效降低高压调节阀参与负荷控制的动作频率,使机组的负荷跟踪更加快速稳定,机组运行稳定性更好。该旁路阀辅助调频自动控制策略可为同类型机组灵活性改造、提高产能效益提供一定的理论依据和实践经验。
To maintain the minimum flow of low-pressure cylinder after cutting the cylinder,thermal power units that participate in deep flexibility peak shaving will add a bypass valve on the basis of the original low-pressure cylinder inlet valve.After the transformation of a 350 MW unit’s cylinder cutting process in a power plant,using the characteristics of small cylinder bypass valve stroke,rapid adjustment action and high accuracy of small flow control,the relationship between the change in opening of the bypass valve and the change in electrical load was determined through theoretical calculations.The automatic control scheme and control logic of bypass valve auxiliary power plant frequency modulation were designed.Moreover,the simulation was carried out based on MATLAB software,and the corresponding configuration scheme was imported into the decentralized control system of the unit for experimental verification.The results show that,the application of automatic control scheme of auxiliary frequency modulation for cylinder bypass valve improves the load tracking quality of the unit,effectively reduces the action frequency of the high-control valve participating in the load control,and the main steam pressure of the unit is more stable.The automatic control strategy of the bypass valve auxiliary frequency modulation can provide a certain theoretical basis and practical experience for the same type of units to carry out flexibility transformation and improve productivity.
作者
张静
杨超杰
王琦
卫鑫
姜平
李丽锋
ZHANG Jing;YANG Chaojie;WANG Qi;WEI Xin;JIANG Ping;LI Lifeng(Department of Automation,Shanxi University,Taiyuan 030013,China;Shanxi Hepo Power Generation Co.,Ltd.,Yangquan 045001,China)
出处
《热力发电》
CAS
北大核心
2020年第9期109-113,132,共6页
Thermal Power Generation
基金
国家自然科学基金项目(61803244)。
关键词
灵活性改造
低压缸
旁路阀
辅助调频
自动控制
负荷跟踪
flexibility transformation
low pressure cylinder
bypass valve
auxiliary frequency modulation
automatic control
load tracking
