![]() ![]() The closed-loop response will then be unstable if the gain We see that one of the open-loop poles is in the right-half plane. Running this m-file should generate the following root locus plot. Suppose we have the open-loop transfer function given below.Ĭreate a new m-file, and enter following code. The following example demonstrates this concept. The case in real life), a part of the root locus will be trapped in the right-half plane. ![]() The problem is that when an added zero does not exactly cancel the corresponding unstable pole (which is always Is to add zeros at the same locations as the unstable poles, to in effect cancel the unstable poles. When an open-loop system has right-half-plane poles (in which case the system is unstable), one idea to alleviate the problem
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