Abstract
This paper proposes a novel technique to tune the PI controllers of a bidirectional HVDC light system by embedding particle swarm optimization directly in the Simulink model in the design procedure. The HVDC light system comprises of a rectifier station, a DC link, and an inverter station. Each converter station requires four PI controllers to be tuned in the decoupled d-q vector control scheme, and with the bidirectional HVDC system, the required PI controllers are doubled. Tuning these many controllers using conventional methods is a challenging task, especially if the parameters of the converter stations are different. A novel approach to tune the PI controllers for a bidirectional HVDC system using the time-domain performance indices is presented in this paper. The time-domain performance indices are optimized using the particle swarm optimization (PSO) algorithm. The results of the proposed tuning method show that the proposed method not only gives superior results but also is less cumbersome to tune compared to conventional methods like modulus optimum (MO).
Highlights
The results of the proposed tuning method show that the proposed method gives superior results and is less cumbersome to tune compared to conventional methods like modulus optimum (MO)
The brisk development of power electronic technology in recent years has led to the advancement of voltage source converters (VSC), which has resulted in a new era of HVDC light systems
HVDC systems are well established and have been in use for a long time [4]. These technologies cannot be directly applied to the VSC-based HVDC light system because the degrees of freedom presented by the VSC-based converters pose new challenges
Summary
The brisk development of power electronic technology in recent years has led to the advancement of voltage source converters (VSC), which has resulted in a new era of HVDC light systems. This has renewed the interest of researchers in HVDC transmission. HVDC systems are well established and have been in use for a long time [4] These technologies cannot be directly applied to the VSC-based HVDC light system because the degrees of freedom presented by the VSC-based converters pose new challenges. The most common control strategies applied for VSC-based HVDC light systems are the voltage oriented control (VOC) and the direct.
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