Bachelor' thesis Sarah Henn


Experimental analysis and control parameter optimization proposal for the E.ON ERC main building’s automation system

Bachelor's thesis Henn Copyright: EBC

Within this bachelor thesis various control systems at the E.ON ERC Main Building are considered, possible improvement potentials are unveiled and proposals for increased control quality are developed and critically reviewed.

At first, the relevant basics in control theory are presented. Especially an introduction to indicators for control loop performance and to the transmission behavior of control loop elements takes place.

The Concrete Core Activation and of the Fašade Ventilation Units serve as a case study. In cooling mode, a control valve, executed as a three-way valve, regulates the flow temperature to the consumer. The transmission behavior of the controlled systems is described by a functional diagram. In the following, experimental step responses of the controlled systems are analyzed to verify its transmission behavior and to identify it mathematically.

The actual control quality is calculated from step responses of the closed control loop. In order to ameliorate this tuning quality, tuning rules and adjustment standards are suggested and alternately applied. For every method another step experiment of the reference variable is conducted and the results in control quality are evaluated.

With a concluding consideration of all control results the quality of the tuning rules can be compared and discussed.

The results show an improvement of control quality up to 48%for the control system of the Fašade Ventilation Units and up to 88% for the control systems of the Concrete Core Activation. The improvement crucially depends on the applied method. Within this thesis a controller parameterization based on experimental investigated parameters and Lambda-Tuning are the most effective methods.