### Abstract

Plants, which have Right Half Plane (RHP) zero(s), are called as non-minimum phase systems due to their specific phase response characteristics. They have several constraints, such as bandwidth limitation, achievable sensitivity reduction etc., in the design of feedback control systems. Furthermore, the conventional Disturbance Observer (DOB) cannot be directly applied to the non-minimum phase systems due to internal stability problem. This paper proposes a new solution for the robust control problem of non-minimum phase systems by using the DOB. A non-casual, minimum phase transfer function is proposed to remove the internal stability problem in the design of DOB. The Poisson integral formula is used so that the bandwidth constraints of DOB, which occurs due to nonminimum phase characteristic, are analytically derived. The proposed method is applied to a general second order plant model with a RHP zero and system uncertainties. Simulation results are given to show the validity of proposed method.

Original language | English |
---|---|

Title of host publication | 2013 IEEE International Conference on Mechatronics, ICM 2013 |

Pages | 46-51 |

Number of pages | 6 |

DOIs | |

Publication status | Published - 2013 |

Event | 2013 IEEE International Conference on Mechatronics, ICM 2013 - Vicenza, Italy Duration: 2013 Feb 27 → 2013 Mar 1 |

### Other

Other | 2013 IEEE International Conference on Mechatronics, ICM 2013 |
---|---|

Country | Italy |

City | Vicenza |

Period | 13/2/27 → 13/3/1 |

### Fingerprint

### ASJC Scopus subject areas

- Electrical and Electronic Engineering
- Mechanical Engineering

### Cite this

*2013 IEEE International Conference on Mechatronics, ICM 2013*(pp. 46-51). [6518509] https://doi.org/10.1109/ICMECH.2013.6518509

**A new solution for the robust control problem of non-minimum phase systems using disturbance observer.** / Sariyildiz, Emre; Ohnishi, Kouhei.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*2013 IEEE International Conference on Mechatronics, ICM 2013.*, 6518509, pp. 46-51, 2013 IEEE International Conference on Mechatronics, ICM 2013, Vicenza, Italy, 13/2/27. https://doi.org/10.1109/ICMECH.2013.6518509

}

TY - GEN

T1 - A new solution for the robust control problem of non-minimum phase systems using disturbance observer

AU - Sariyildiz, Emre

AU - Ohnishi, Kouhei

PY - 2013

Y1 - 2013

N2 - Plants, which have Right Half Plane (RHP) zero(s), are called as non-minimum phase systems due to their specific phase response characteristics. They have several constraints, such as bandwidth limitation, achievable sensitivity reduction etc., in the design of feedback control systems. Furthermore, the conventional Disturbance Observer (DOB) cannot be directly applied to the non-minimum phase systems due to internal stability problem. This paper proposes a new solution for the robust control problem of non-minimum phase systems by using the DOB. A non-casual, minimum phase transfer function is proposed to remove the internal stability problem in the design of DOB. The Poisson integral formula is used so that the bandwidth constraints of DOB, which occurs due to nonminimum phase characteristic, are analytically derived. The proposed method is applied to a general second order plant model with a RHP zero and system uncertainties. Simulation results are given to show the validity of proposed method.

AB - Plants, which have Right Half Plane (RHP) zero(s), are called as non-minimum phase systems due to their specific phase response characteristics. They have several constraints, such as bandwidth limitation, achievable sensitivity reduction etc., in the design of feedback control systems. Furthermore, the conventional Disturbance Observer (DOB) cannot be directly applied to the non-minimum phase systems due to internal stability problem. This paper proposes a new solution for the robust control problem of non-minimum phase systems by using the DOB. A non-casual, minimum phase transfer function is proposed to remove the internal stability problem in the design of DOB. The Poisson integral formula is used so that the bandwidth constraints of DOB, which occurs due to nonminimum phase characteristic, are analytically derived. The proposed method is applied to a general second order plant model with a RHP zero and system uncertainties. Simulation results are given to show the validity of proposed method.

UR - http://www.scopus.com/inward/record.url?scp=84879403682&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879403682&partnerID=8YFLogxK

U2 - 10.1109/ICMECH.2013.6518509

DO - 10.1109/ICMECH.2013.6518509

M3 - Conference contribution

AN - SCOPUS:84879403682

SN - 9781467313889

SP - 46

EP - 51

BT - 2013 IEEE International Conference on Mechatronics, ICM 2013

ER -