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基于尼科尔斯PID设计方法的负荷频率控制

, PP. 79-85

Keywords: 水轮发电系统,负荷频率控制,尼科尔斯曲线,比例-积分-微分控制器

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Abstract:

为解决互联水电系统负荷频率控制(loadfrequencycontrol,LFC)问题,及保持互联电网系统频率、联络线功率及区域控制误差(areacontrolerror,ACE)的稳定,根据闭环系统谐振峰值与系统响应最大峰值之间的关系,构建一个与系统参数及控制器参数都相关的优化问题,通过该问题的求解获得控制器参数与系统参数之间的数学关系,针对水轮发电系统非最小相位特性,通过串加比例–微分(proportional-derivative,PD)控制方式降低系统阶次,设计尼科尔斯(Nichols)曲线的比例–积分–微分(proportional-integral-derivative,PID)控制器。基于模型参数扰动和负荷干扰的仿真结果表明:尼科尔斯PID控制器能快速调整系统频率偏差、联络线功率偏差及ACE为0,具有良好的鲁棒性能和抗负荷干扰性能,系统过渡过程性能明显优于传统PID调节器结果。

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