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Design of Control Systems
Phase-Lag Control for Smoother System Response
Description
Phase-lag control helps a system respond more smoothly and stay stable. It is also used to reduce steady-state error, which is the small difference that can remain after a system settles. A dimmer switch for a light bulb is a simple real-world example. It changes brightness gradually instead of all at once.
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Transcript
以调光开关控制灯泡亮度为例。这体现了相位滞后控制,即灯泡的亮度被逐渐调节。
从数学上讲,当因子“a”小于1时,表示一个相位滞后控制器或低通滤波器。
滞后相位控制器不会在零点处配置极点。相反,它通过一个放大因子来增强任何有限且非零的误差常数,从而影响稳态误差。通过将极点和零点紧密对齐,它能够提高系统的阻尼性能。
可以通过调整增益的值来补偿因子的变化,从而在不改变前向路径传递函数的情况下实现相位滞后控制的利用。
相位滞后控制的传递函数具有一个增益因子,该因子被纳入前向增益中。
相位滞后控制的设计过程包括绘制未补偿系统的伯德图,设定前向通路增益,从伯德图中确定相位裕度和增益裕度,并找出达到所需相位裕度的频...
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