汽轮机功率负荷不平衡保护定值计算方法分析  

Calculation Method Analysis of Steam Turbine Load Power Unbalance Protection Settings

作　　者：刘昭睿 艾东平[2] 于大海[2] 郭琪 LIU Zhaorui;AI Dongping;YU Dahai;GUO Qi(Inner Mongolia Power(Group)Co.,Ltd.Inner Mongolia Power Dispatch and Control Company,Hohhot 010010,China;China Electric Power Research Institute,Beijing 100192,China;Inner Mongolia Power(Group)Co.,Ltd.Inner Mongolia Electric Power Research Institute,Hohhot 010010,China)

机构地区：[1]内蒙古电力(集团)有限责任公司内蒙古电力调度控制分公司,内蒙古呼和浩特010010 [2]中国电力科学研究院,北京100192 [3]内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司,内蒙古呼和浩特010010

出　　处：《河北电力技术》2024年第6期89-94,共6页Hebei Electric Power

基　　金：内蒙古电力(集团)有限责任公司科技项目(2024-4-68)。

摘　　要：针对汽轮机功率负荷不平衡(power load unbalance,PLU)保护增加转速闭锁条件后在电网扰动时仍出现误动的情况,研究电网短路故障暂态过程中机组机械功率、电磁功率等关键指标的变化,采用理论推导与仿真分析得出暂态过程中汽轮机转速飞升的规律,采用大电网实测数据仿真分析故障类型及持续时间、机组运行方式等因素对汽轮机转速变化的影响及机理,提出一种汽轮机负荷功率不平衡保护定值计算方法。该方法采用理论计算与仿真计算相结合,可有效提高汽轮机PLU保护的保护性能和可靠性。To address the issue of turbine power load unbalance(PLU)protection being triggered during grid disturbances,even after implementing speed blocking conditions,this study combines theoretical derivation and simulation analysis to investigate the changes in key indicators,such as mechanical and electromagnetic power,during the transient process of a grid short-circuit fault.The transient behavior of the steam turbine speed,particularly its rapid rise during these events,is analyzed.The study further explores the impact and mechanisms of factors such as fault type,fault duration,and unit operation mode on speed variations,utilizing measured data from a large power grid.Based on this analysis,a method for calculating the setpoint of steam turbine load unbalance protection is proposed.This method integrates theoretical and simulation-based calculations,effectively enhancing the performance and reliability of steam turbine PLU protection.

关 键 词：汽轮机 功率负荷不平衡保护 短路故障 保护定值 电网仿真 

分 类 号：TM311[电气工程—电机]