Analysis of the claimed robustness for PI/PID robust tuning rules
23 Jun 2010-pp 658-662
TL;DR: In this paper, the authors analyze how recognized robust PI/PID tuning rules accomplish with respect to its robustness specification. And they conclude that even if the robustness issue has been incorporated in the new approaches for tuning and design of PI/PI controllers, this does not sufficient.
Abstract: This paper analyzes how recognized robust PI/PID tuning rules accomplish with respect to its robustness specification. A concrete analysis is conducted where the chosen PI/PID controller tuning rules are based on a precise quantitative robustness specification such as the Maximum Sensitivity; Ms; value. It is reported that the claimed robustness specification in most of the cases is not accomplished for some set of plants, on other cases it is accomplished with excessive margin, therefore providing a not satisfactory Robustness/Performance tradeoff. The conclusion drawn from this study is that even if the robustness issue has been incorporated in the new approaches for tuning and design of PI/PID controllers, this does not sufficient. In order to appropriately tackle the Robustness/Performance tradeoff, the achieved robustness level should not only be an integral specification, but its accomplishment should be checked.
Citations
More filters
TL;DR: In this article, a sliding-mode-control-based vector control scheme for the oscillating water column (OWC) plant is presented, which is intrinsically robust under parameter uncertainties and presents a convenient disturbance rejection.
Abstract: The worldwide demand for energy requires alternatives to fossil fuels and nuclear fission, so renewable resources, particularly ocean energy, are called to play a relevant role in a near future. In particular, the oscillating water column (OWC) is one of the most promising devices to harness energy from the sea, as it is the case of the Nereida project plant, located in the Basque coast of Mutriku. This kind of devices consists of a particular type of turbine and a doubly fed induction generator. The turbogenerator module is usually controlled using a traditional proportional-integral (PI)-based vector control scheme, which requires an accurate knowledge of the system parameters and lacks of robustness, limiting, in some cases, the power extraction. To avoid these drawbacks, a novel sliding-mode-control-based vector control scheme for the OWC plant is presented in this paper. This variable-structure control is intrinsically robust under parameter uncertainties, which always appear in real systems, and presents a convenient disturbance rejection. The stability of the proposed controller is analyzed using the Lyapunov theory. The performance of the control scheme presented is proved by comparing it to the traditional PI-based vector control scheme in a series of representative maximum power generation case studies. Both numerical simulations and experimental results show that the proposed solution provides high-performance dynamic characteristics, improving the power extraction in spite of parameter uncertainties and system disturbances.
88 citations
Additional excerpts
...7)....
[...]
TL;DR: In this paper, a robust tuning method for two-degree-of-freedom (2DoF) proportional integral (PI) controllers is proposed based on the use of a model reference optimization procedure with servo and regulatory target closed-loop transfer functions for first and second-order plus dead-time (FOPDT, SOPDT) controlled process models.
64 citations
TL;DR: The design and experimental validation of a new Sliding Mode Controller (SMC) for a single-phase grid-tie inverter in a photovoltaic (PV) Maximum Power Point Tracking (MPPT) application is presented, concluding that the presented system provides an efficient maximum power tracking.
50 citations
TL;DR: In this paper, a Luenberger-based observer is considered and the effectiveness of the proposed control is shown by numerical simulations, which provides better performance since it increases power extraction in the sense that it allows a more reliable and robust performance of the plant, which is even more relevant in a hostile environment as the ocean.
Abstract: The 2009/28/EC Directive requires Member States of the European Union to adopt a National Action Plan for Renewable Energy. In this context, the Basque Energy Board, EVE, is committed to research activities such as the Mutriku Oscillating Water Column plant, OWC. This is an experimental facility whose concept consists of a turbine located in a pneumatic energy collection chamber and a doubly fed induction generator that converts energy extracted by the turbine into a form that can be returned to the network. The turbo-generator control requires a precise knowledge of system parameters and of the rotor angular velocity in particular. Thus, to remove the rotor speed sensor implies a simplification of the hardware that is always convenient in rough working conditions. In this particular case, a Luenberger based observer is considered and the effectiveness of the proposed control is shown by numerical simulations. Comparing these results with those obtained using a traditional speed sensor, it is shown that the proposed solution provides better performance since it increases power extraction in the sense that it allows a more reliable and robust performance of the plant, which is even more relevant in a hostile environment as the ocean.
48 citations
TL;DR: In this paper, una perspectiva general de the diferentes enfoques existentes, con que se ha afrontado el problema of obtener un controlador proporcional integral derivativo (PID) robusto.
Abstract: Resumen En este trabajo se presenta una perspectiva general de los diferentes enfoques existentes, con que se ha afrontado el problema de obtener un controlador proporcional integral derivativo (PID) robusto. La estructura restringida y muy particular que impone el controlador PID, supone por un lado, un atractivo que ha sido la causa de su extenso uso en el sector industrial, pero por el otro, impone una serie de dificultades al plantear la incorporacion de consideraciones de robustez en su diseno. Hoy en dia, el abanico de posibilidades de diseno de un controlador PID es realmente amplio, pudiendo afrontarse con pŕacticamente cualquier enfoque, en concreto con cualquier enfoque de control robusto. A este respecto, es importante distinguir entre los metodos y las reglas de sintonia, siendo de especial inteŕes en el caso del controlador PID, la generacion de reglas de sintonia a la vez simples y que proporcionen ciertas garantias de robustez. Como paso previo a esta clasificacion, conviene establecer de que manera se representa y mide la robustez. Por lo tanto, de que manera acaba formuĺandose como especificacion de disẽno. El trabajo repasa tambien, conceptos aparecidos recientemente en la literatura del control PID y relacionados con la robustez, como son el cumplimiento de la misma y la fragilidad del controlador.
38 citations
References
More filters
TL;DR: In this paper, the three principal control effects found in present controllers are examined and practical names and units of measurement are proposed for each effect and corresponding units for a classification of industrial processes in terms of two principal characteristics affecting their controllability.
Abstract: In this paper, the three principal control effects found in present controllers are examined and practical names and units of measurement are proposed for each effect. Corresponding units are proposed for a classification of industrial processes in terms of the two principal characteristics affecting their controllability. Formulas are given which enable the controller settings to be determined from the experimental or calculated values of the lag and unit reaction rate of the process to be controlled
5,412 citations
01 Jan 1942
TL;DR: In this paper, the three principal control effects found in present controllers are examined and practical names and units of measurement are proposed for each effect.
3,869 citations
"Analysis of the claimed robustness ..." refers background in this paper
...I. INTRODUCTION Since Ziegler and Nichols [21] presented their PID controller tuning rules, a great number of procedures have been developed as revealed in O’Dwyer’s review [14]....
[...]
...Since Ziegler and Nichols [21] presented their PID controller tuning rules, a great number of procedures have been developed as revealed in O’Dwyer’s review [14]....
[...]
TL;DR: A simple method for estimating the critical gain and the critical frequency is described, which may be used for automatic tuning of simple regulators as well as initialization of more complicated adaptive regulators.
1,763 citations
Book•
01 Jan 2003
TL;DR: In this paper, the authors present Controller Architecture Tuning Rules for PI Controllers Tuning rules for PID Controllers Performance and Robustness Issues Glossary of Symbols Used in the Book Some Further Details on Process Modeling
Abstract: Introduction Controller Architecture Tuning Rules for PI Controllers Tuning Rules for PID Controllers Performance and Robustness Issues Glossary of Symbols Used in the Book Some Further Details on Process Modeling.
1,399 citations
"Analysis of the claimed robustness ..." refers background in this paper
...Since Ziegler and Nichols [21] presented their PID controller tuning rules, a great number of procedures have been developed as revealed in O’Dwyer’s review [14]....
[...]