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本文通过数字仿真试验,分析了中间再热汽轮机快关阀门对提高电力系统短路事故时的稳定性和降低机组甩负荷后的动态超速的作用。试验表明,快关能提高电力系统的事故极限切除时间0.035秒左右。在事故极限切除时间不变的条件下,能提高稳定输送功率10％以上;降低甩负荷后的动态超速3.6％左右。同时,本文还给出了动态特性仿真通用程序框图和实现快关的逻辑结构图。
In this paper, through digital simulation test, the effect of quick-closing valve of intermediate reheat turbine on improving the stability of power system short-circuit accident and reducing the dynamic speeding after unit load rejection is analyzed. Experiments show that the fast off can improve the power system accident cut-off time of about 0.035 seconds. Under the condition of constant accidental cutting time, the stable transmission power can be increased by more than 10%, and the dynamic overspeed after load shedding can be reduced by about 3.6%. At the same time, this article also gives a general block diagram of the dynamic characteristics of simulation and logic diagram to achieve fast off.