TABLE OF CONTENTS For the implementation of FACTS-Devices, especially for controllable transmission paths in an AC-system, intensive planning studies and redesign of control and protection systems have to be executed. Adverse control interactions with other controllers and a lack of optimization potential due to predefined devices have to be considered. Applying a control architecture, which enables the operation of a new FACTS-device and especially a controlled transmission path without affecting the rest of the system, can eliminate these problems. This non-intrusiveness is the key issue of the so-called Non-Intrusive System Control (NISC) architecture. In this chapter the basic requirements and structure of this new control architecture are described first. A second focus is given to the problem of controller interactions in abnormal operation situations where the NISC architecture helps to avoid malfunctioning or adverse reactions.
Power system control analysis and design methodologies are mainly aiming at the assessment of single devices by means of their systemic behavior. In particular in the area of devices enhancing the flexibility of power systems (FACTS-devices) the corresponding design techniques are dedicated to either steady-state operation or power system dynamic improvement. In the spot of application studies normally FACTS-devices are considered as stand-alone solutions. These approaches are limited to a given device functionality rather than considering and designing the entire system on functional basis. The design of a solution for a transmission problem by starting from a functional specification offers more degrees of freedom. Herein, impedance control, voltage and current injection are considered as single...
