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title = "Right Half Plane Zeros"
author = ["Dehaeze Thomas"]
draft = false
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Right Half Plane (RHP) Zeros are present in a broad range of systems.
- SISO RHP zeros:
- \\(G(z) = 0\\). The real part of \\(z\\) is positive
- MIMO RHP zeros:
- RHP zeros of the determinant of the transfer function matrix
- For MIMO plants, the zero is associated with an output direction
- Consequences:
- Non minimum phase
- Usually, if looking at the step response, at first the response goes in the wrong direction
- The frequency of the RHP zero should be outside the controller bandwidth.
It therefore impose a fundamental limitation to the controller bandwidth.
The reason is that inside the control bandwidth, the controller basically inverts the plant, and the inverse of a RHP zero is an unstable pole.
## Bibliography {#bibliography}
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