An optimized LQG servo controller design using LQI tracker for VSP-based AC/DC interconnected systems

Rakhshani, E.; Naveh, Iman Mohammad Hosseini; Mehrjerdi, Hasan; Pan, K.

doi:10.1016/j.ijepes.2020.106752

An optimized LQG servo controller design using LQI tracker for VSP-based AC/DC interconnected systems

Title

An optimized LQG servo controller design using LQI tracker for VSP-based AC/DC interconnected systems

Author

Rakhshani, E. (TU Delft Intelligent Electrical Power Grids)
Naveh, Iman Mohammad Hosseini (Islamic Azad University, Gonabad Branch)
Mehrjerdi, Hasan (Qatar University)
Pan, K. (TU Delft Intelligent Electrical Power Grids)

Date

2021

Abstract

This paper proposes a novel application for the optimal Linear Quadratic Gaussian (LQG) servo controller to enable a proper coordination of the AC/HVDC interconnected system with Virtual Synchronous Power (VSP) based inertia emulation. Particularly, the proposed control design takes the process disturbances and measurement noise of the studied VSP-HVDC system into account, while few studies have focused on this perspective. The proposed LQG controller with modifications is designed by means of a combination of Kalman Filter (state estimator) and an added Linear Quadratic Integrator (LQI) to observe the system model's states and track the reference commands while rejecting the effects of system noise. Besides, we utilize a swarm-based optimization algorithm to operate as the search process for the tuning of the elements in the weighting matrices involved in the controller design. The role of the proposed optimal LQG controller is to stabilize such AC/DC interconnected system with VSP-based inertia emulator while minimizing the associated performance index. According to the obtained simulation results, in addition to the advancement from the VSP-based approach for damping frequency oscillations excited by faults, application of the proposed LQG servo controller can achieve the targets on both estimating the state variables and tracking the reference signals with satisfactory performance, comparing with the conventional LQG regulator.

Subject

AC/HVDC system
Linear Quadratic Gaussian
Virtual inertia emulation
Virtual Synchronous Power

To reference this document use:

http://resolver.tudelft.nl/uuid:a4617a87-e5be-4024-a2d9-5412f190df99

DOI

https://doi.org/10.1016/j.ijepes.2020.106752

ISSN

0142-0615

Source

International Journal of Electrical Power & Energy Systems, 129

Part of collection

Institutional Repository