A Novel Explicit Disturbance Model-Based Robust Damping of Interarea Oscillations Through MTDC Grids Embedded in AC Systems

This paper presents a novel approach to damp interarea oscillations by designing a robust multi-input multioutput supplementary controller for multiterminal dc (MTDC) systems embedded in ac grids. The key idea to achieve robustness lies in explicitly modeling the MTDC current injection as disturbanc...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2018-08, Vol.33 (4), p.1864-1874
Main Authors: Banerjee, Abhishek, Chaudhuri, Nilanjan Ray, Kavasseri, Rajesh G.
Format: Article
Language:English
Subjects:
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Computer simulation
Control design
Converters
Current injection
Damping
Disturbances
Embedded systems
explicit disturbance modeling
Feedback
inter-area oscillations
Linear matrix inequality (LMI)
Mathematical analysis
Mathematical model
Matrix methods
mixed-sensitivity
Moisture content
multiterminal DC (MTDC)
Oscillations
Oscillators
Robust control
Robustness
Robustness (mathematics)
Sensitivity
Voltage control
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Summary:This paper presents a novel approach to damp interarea oscillations by designing a robust multi-input multioutput supplementary controller for multiterminal dc (MTDC) systems embedded in ac grids. The key idea to achieve robustness lies in explicitly modeling the MTDC current injection as disturbances using an {\mathcal H}_{\infty } mixed-sensitivity formulation in the linear matrix inequality framework. Control directions are established by selecting wide-area feedback signals and the relative gain array computation. Robustness is assessed through dynamic simulations for scenarios including: first, disturbances on the ac side, second, disturbances on the dc-side such as loss of a converter pole including actuator, third, partial loss of feedback signal, and fourth, communication latencies. The performance of the proposed controller is compared against the conventional {\mathcal H}_{\infty } based design, using a four-terminal dc grid embedded within the New England-New York test system. The results suggest that the proposed approach demonstrates superior performance following dc-side disturbances, actuator outages, and latency.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2018.2799170