Decentralised Nonlinear Observer Controller for Large Scale Power Systems

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A Decentralised Nonlinear SDRE Observer-Controller Scheme for Large Scale Power Systems
Ayyarao Tummala, Kumar Pakki Bharani Chandra, V. Ramana Rao Pulipaka
IET Generation Transmission & Distribution, December 2017, the Institution of Engineering and Technology (the IET)
DOI: 10.1049/iet-gtd.2017.0691
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A decentralised nonlinear SDRE observer-controller scheme for
large scale power systems
What is it about?
Power system is a nonlinear distributed system and is a ected with several faults.
These faults adversely a ects the transient stability of the system. The conventional
power systems are usually controlled by linear controllers by linearizing around the
operating point. In most of the realistic cases the complete power system dynamics
cannot be represented by a single linear model; several linear models are required to
represent the complete operating range of the power systems.
Why is it important?
1. A derivative free decentralized nonlinear observer and controller is designed which
does not need the linearized models or Jacobians of the multi-machine power
systems. Further, the structure of the designed SDRE controller and observer is the
same for the complete operating region.
2. The proposed scheme is based on output measurements, and hence the complete
state vector information is not required for the controller design.
3. The SDRE state estimation process is based on local measurements only, which
avoids errors arising from delay in measurements. The proposed decentralized SDRE
observer estimates the states of individual generation units.
4. The designed SDRE observer minimizes the square-norm of the estimation error
between the system states and observer states. This inherently handles the process
and measurement noises.
5. The proposed scheme can inherently deal with various types of faults; and hence
improves the transient and steady-state stability of the system.
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PDF generated on 19-Dec-2017
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