Oscillatory stability control for power systems has become more important since low frequency inter area oscillations are often poorly damped due to increasing load demand and growing penetration levels of renewable energy sources, during transient and dynamic conditions. Undesirable power system states such as tripping of transmission lines, generation sources and loads, can lead to cascaded outages and blackouts in interconnected grid. The developed robust control theories in one side and wide-area measurement technologies in the other side make the wide area real time feedback control potentially promising for cascade outages prohibition. This research is to develop a systematic procedure of designing damping control system for interconnected power grid by applying Wide Area Measurement (WAM) and robust control techniques while putting emphasis on several practical considerations. The following objectives of research are achieved in this thesis: - Design of fixed order wide area damping controller: This thesis presents the design of Multi Input, Multi Output (MIMO) fixed order non-smooth robust H∞ wide area damping controller for supressing power oscillations and stabilizing the multi machine power system. Due to the restricted accuracy of classical local damping controllers to a neighbourhood of the operating point, robust controllers are considered. In order to reduce the computational complexity of the control design and the order of the synthesized controller, instead of reduction of the number of states, this research focused on design of fixed order controller that does not need to reduce the order of controller later. Fixed order is a restricted structural constraint on the controller. The proposed method is based on shaping of the open loop transfer function in the frequency domain. Nonsmooth optimization techniques are used to H∞ synthesis problem under additional structural constraints (fixed order) on the controller. This approach avoids using Lyapunov variables and therefore leads to moderate size ...
Design of Fixed Order Nonsmooth Robust H∞ MIMO Wide Area Controller for Damping of Inter Area Oscillations in Power Grids
2019-11-12
Hochschulschrift
Elektronische Ressource
Englisch
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