Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems

Stojković, J.; Lekic, A.; Stefanov, Predrag

doi:10.3390/en13236162

Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems

Title

Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems

Author

Stojković, J. (University of Belgrade)
Lekic, A. (TU Delft Intelligent Electrical Power Grids)
Stefanov, Predrag (University of Belgrade)

Date

2020

Abstract

Decarbonization of power systems has put Renewable Energy Sources (RES) at the forefront when it comes to electric power generation. The increasing shares of converter-connected renewable generation cause a decrease of the rotational inertia of the Electric Power System (EPS), and consequently deteriorate the system capability to withstand large load-generation imbalances. Low-inertia systems are subjected to fast and large frequency changes in case of in-feed loss, where the traditional primary frequency control is not sufficient to preserve the frequency stability and to maintain the frequency above the critical value. One possible solution to this rising problem is seen in Fast Frequency Response (FFR) provided by the High-Voltage Direct-Current (HVDC)-based systems. This paper presents the adaptive FFR control of HVDC-based systems for frequency stability enhancement in the low-inertia system. The EPS is considered as a “black box” and the HVDC response is determined only using the locally measured frequency change. Sliding Mode Control (SMC) of the Modular Multilevel Converter (MMC) was developed and demonstrated to provide faster and more appropriate frequency response compared to the PI controller. The described adaptive HVDC control considers the size of disturbance and the inertia of the power system, and it is verified by simulations on the IEEE 39 bus test system implemented in MATLAB/Simulink for different system configurations and different sizes of disturbance.

Subject

Frequency control
HVDC-based power system
Low-inertia power systems
Modular multilevel converter

To reference this document use:

http://resolver.tudelft.nl/uuid:695e5144-b45f-4119-beb8-7ae32196e61a

DOI

https://doi.org/10.3390/en13236162

ISSN

1996-1073

Source

Energies, 13 (23), 1-20

Part of collection

Institutional Repository