基于大型水轮发电机组调速器的防溜负荷研究

Study on Load Slump Prevention of Turbine Governors of Large Hydro-generator Unit

水轮发电机组调速器具有并网和调节功能,是实现水轮机组正常运转的关键部分。汛期发电机组水头较低,导叶开度开至调速器最大开限仍无法达到满负荷运行,监控系统持续给调速器系统发出开导叶指令,导致调速器PGV码值不断累计翻转出现不定态,从而出现溜负荷的现象。针对此问题,提出了一种基于大型水轮发电机组调速器优化改进的PCC控制逻辑。首先,通过在PCC程序上增加综合负荷给定PGV上限控制程序语句,从而避免PGV码值超量程后翻转出现的不定态问题。其次,增加导叶反馈与给定控制,使得两者差值不大,进一步提高监控与调速器的配合度。最后,通过实验验证了改进的PCC控制逻辑在解决调速器PGV翻转时出现机组溜负荷的有效性。

The turbine governors of hydro-generator units has the functions of grid connection and regulation,which is the key part to realize units′ normal operation.During the flood season,the generator set head is low,the guide vane opening degree is opened to the governor′s maximum opening limit and still can′t reach the full load operation.The monitoring system continues to issue the guide vane instruction to the governor system,which leads to the governor′s PGV code value continuously accumulating and flipping to inconsistent state,and further to load slump.This paper puts forward a PCC control logic optimized for improving governor of the large hydroelectric turbine unit.First a combined load determined PGV upper limit control statement is added on the PCC(programmable computer controller) program,so as to avoid the inconsistency that occurs when the PGV code value turns over after exceeding the range.Second a guide vane feedback and setting control is introduced to maintain a low difference between the monitor and the governor and improve the cooperation.Finally the effectiveness of the improved PCC control logic in this paper in solving governor PGV flipping-induced load slump is verified by experiment.