To enhance the energy utilization efficiency,three motor-driven induced-draft fans (IDF)are ap-plied,causing problem taht the balance bias control strategy of the conventional double-IDF is not applica-ble to furnace pressure control.Moreover,balance control of the three IDFs can not be realized.Thus,by developing macro module IDFBALANCER in Ovtaion DCS,the balance control problem among the three IDFs was well solved,and the control loop's adaptive ability with different auto IDF's numbers was en-hanced.%为了节能和提高能源利用率，锅炉风烟系统采用了3台电动引风机，从而出现了常规双引风机的平衡偏置控制策略不适用于炉膛压力控制，且无法实现3台引风机之间的平衡控制的问题。对此，通过在Ovation DCS上开发IDFBALANCER宏模块，很好地解决了3台引风机间的平衡控制问题，并且提高了在改变自动控制方式的引风机数量时，炉膛压力调节回路的自适应能力。
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