For achieving robust control of the nuclear island HVAC system of CPR1000 nuclear power unit, the miniature PLC is used. The features of such HVAC control system, i.e. distributed in large scale and centralized in small area, are introduced. The control parameters of two types of controllers, PLC and DDC, are compared, and the superiority of the miniature PLC is analyzed in detail. The results of practical application verify the feasibility of applying miniature PLC, this is good reference for selecting the same kind of control schemes.%为实现对CPR1000核电机组核岛通风系统的可靠控制,采用了小型PLC作为其控制器.介绍了该类型核电机组核岛通风控制系统大分散、小集中的特点,对比了小型PLC和直接数字控制器(DDC)两种控制器的性能参数,详细分析了小型PLC应用的优势.实际应用结果验证了小型PLC应用的可行性,对于同类型的控制方式选择具有参考和借鉴作用.
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