GIO212
转矩限制值包括用户在DCS直接设置的转矩限制值以及伺服电流限制逻辑计算得到的转矩限制值。对于用户在DCS直接设置的转矩限制值。当系统反馈值还未达到系统给定值时,如果转矩输出值达到限制值后,将以限制值作为输出。比如,开环运行状态下,当转矩限制为30%时,如果尚未达到给定量,则PI输出一直限制在30%,分别在积分值与PI输出处进行限制。但是有一点,假如运行情况下转矩限制值为30%,此时上位机修改转矩限制值为20%,需要斜坡下降到20%,不能直接到20%,防止汽轮机出现转速巨大波动。 汽轮机汽门开度(伺服电流反馈值)达到汽轮机汽门开度限制值(伺服电流设定值)后,计算得出的当前转矩输出值。转矩限制逻辑中,将以较小的数值为准。 (2)发电量限制功能 发电量限制值由用户直接在上位机上设定。开环状态时,发电量限制由变频器输入功率直接进行判断。当变频器输入功率绝对值达到发电量限制值时,则将给定信号进行限制。闭环状态时,给定值为进线功率目标值,反馈值为实际进线功率。此时的发电功率限制值,同样与变频器输入功率进行比较,变频器输入功率的绝对值达到发电功率限制值后,需要对进线功率目标值进行修正。 例如:进线功率目标值=500kW;当前变电所实际进线功率=1000kW;发电功率限制值为300kW。当变频器输入功率达到-300kW时,进线功率目标值将自动调整至700kW。 GIO212
GIO212
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