Distributed Inter-Area Oscillation Damping Control for Power Systems by Using Wind Generators and Load Aggregators

TL;DR

This paper presents a scalable distributed control framework utilizing wind generators and load aggregators to enhance inter-area oscillation damping in power systems, demonstrated through simulations on a modified IEEE 39-bus system.

Contribution

A novel distributed control framework that coordinates damping controllers using local eigen-analysis and Jacobian reconstruction for power system stability improvement.

Findings

Effective damping of low frequency inter-area oscillations

Improved system stability with distributed damping control

Reduced control costs through coordinated parameter tuning

Abstract

This paper investigates the potential of wind turbine generators (WTGs) and load aggregators (LAs) to provide supplementary damping control services for low frequency inter-area oscillations (LFOs) through the additional distributed damping control units (DCUs) proposed in their controllers. In order to provide a scalable methodology for the increasing number of WTGs and LAs, a novel distributed control framework is proposed to coordinate damping controllers. Firstly, a distributed algorithm is designed to reconstruct the system Jacobian matrix for each damping bus (buses with damping controllers). Thus, the critical LFO can be identified locally at each damping bus by applying eigen-analysis to the obtained system Jacobian matrix. Then, if the damping ratio of the critical LFO is less than a preset threshold, the control parameters of DCUs will be tuned in a distributed and coordinated manner to improve the damping ratio and minimize the total control cost at the same time. The proposed control framework is tested in a modified IEEE 39-bus test system. The simulation results with and without the proposed control framework are compared to demonstrate the effectiveness of the proposed framework.