1000 MW机组功率负荷不平衡保护误动原因分析及仿真优化

针对某电厂的机组跳闸事件,对于功率负荷不平衡的逻辑保护异常动作进行仿真分析研究。首先对于机组甩负荷试验时的超速逻辑保护动作记录数据进行分析。其次应用电力系统仿真软件对几种典型的故障进行仿真分析,为功率负荷不平衡保护的转速闭锁定值提供整定依据。最后针对不投入功率负荷不平衡保护的三种模式系统故障下,对于发电机功率、汽轮机功率以及发电机转速进行仿真模拟,得到仿真曲线。分别对三种仿真结果进行对比分析。分析结果表明:采用3 030 r/min作为功率负荷不平衡保护的转速,闭锁定值可以躲过系统的典型故障,同时对于甩负荷时机组超速控制影响也不大。

Analysis and Simulation Optimization of Mal-operation of Power Load Unbalance Protection for 1000MW Unit

Aiming at the tripping event of a power plant unit, the abnormal operation of power load unbalance protection is simulated and analyzed. According to the over-speed protection logic action record data, using the power system simulation software and large network data to simulation calculation according to several typical faults, provide the basis for setting the power load unbalance protection speed lockout setting. The simulation results show that adopting the 3030r/min as the power load unbalance protection can not only avoid the typical fault of the system, but also have little effect on the speed control of the unit when the load is applied.