The objective of this research work is to develop decoupled modulation control methods for damping inter-area oscillations with low frequencies, so the damping control can be more effective and easier to design with less interference among different oscillation modes in the power system.

A signal-decoupling algorithm was developed that can enable separation of multiple oscillation frequency contents and extraction of a “pure” oscillation frequency mode that are fed into Power System Stabilizers (PSSs) as the modulation input signals. As a result, instead of introducing interferences between different oscillation modes from the traditional approaches, the output of the new PSS modulation control signal mainly affects only one oscillation mode of interest.

The new decoupled modulation damping control algorithm has been successfully developed and tested on the standard IEEE 4-machine 2-area test system and a minniWECC system. The results are compared against traditional modulation controls, which demonstrates the validity and effectiveness of the newly-developed decoupled modulation damping control algorithm.

%I Pacific Northwest National Laboratory
%8 05/2016
%0 Conference Paper
%B 2011 IEEE/PES Power Systems Conference and Exposition (PSCE)
%D 2011
%T Deriving optimal operational rules for mitigating inter-area oscillations
%A Ruisheng Diao
%A Zhenyu Huang
%A Ning Zhou
%A Yousu Chen
%A Francis K. Tuffner
%A Jason C. Fuller
%A Shuangshuang Jin
%A Jeffery E. Dagle
%K AA07-001
%K AARD
%K optimization
%K oscillations
%K WECC
%X This paper introduces a new method for mitigating inter-area oscillations of a large scale interconnected power system by means of generation re-dispatch. The optimal mitigation procedures are derived by searching for the shortest distance from current operating condition to a targeted operating condition with the desired damping ratio of the oscillation mode. A sensitivity-based method is used to select the most effective generators for generation re-dispatch and decision tree is trained to approximate the security boundary in a space characterized by the selected generators. The optimal operational rules can be found by solving an optimization problem where the boundary constraints are provided by the decision tree rules. This method is tested on a Western Electricity Coordinating Council (WECC) 179-bus simplified model and simulation results have demonstrated the validity of the decision-tree-based method and shown promising application in real time operation.

%B 2011 IEEE/PES Power Systems Conference and Exposition (PSCE) %I IEEE %C Phoenix, AZ, USA %P 1 - 8 %8 03/2011 %@ 978-1-61284-789-4 %R 10.1109/PSCE.2011.5772564