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以控制工程原理为基础,利用模糊-PID控制算法对液位控制数学模型进行分析,并以某污水处理厂的液位控制为研究对象,以进水流量为控制参数,将模糊-PID控制运用其中,通过液位控制对进水量进行调节,对该控制算法是否符合实际运行工况进行验证.结果表明,在液位控制系统使用前,由人工对进水量进行控制,造成液位、进水量具有较大的波动,其中液位最小值和最大值变化范围接近49.5％,液位具有较大的变化范围,并有最大值、最小值出现.在使用液位控制系统后,液位幅度变化趋缓显著,波动基本在设定参数范围内,进水量比使用前有非常大的改善,总体变化平稳,液位误差控制范围在9.5％左右,未有较大的波动出现,表明模糊-PID液位控制系统的鲁棒性、稳定性较好,控制效果达到了预期.“,”The mathematical model of liquid level control is analyzed by using the fuzzy-PID control algorithm based on the principle of control engineering.The fuzzy-PID control is applied to study the liquid level control in a sewage treatment plant by taking the influent flow as control parameter.Adjusting the influent amount by controlling liquid level is used to verify whether this fuzzy-PID control algorithm can meet the practical operational working condition or not.The results show that without liquid level control system,manual control on influent amount can cause both the level and influent amount to fluctuate greatly with the minimum and maximum of level varying in the range close to 49.5％,reflecting that the liquid level can change in a large range and will have the maximum value and the minimum value.After the use of liquid level control system,the varying amplitude of liquid level moderates significantly,basically in the setting parameter range.The influent amount appears a great improvement with smooth changes in overall and the error control locates in the range of 9.5％ or so,without large fluctuations.It represents that the fuzzy-PID water level control system has good robustness and stability and can achieve the expected control efficiency.