Multiple space vector control for self-commutated power converters

Abstract

This paper proposes the multiple space vector control strategy for self-commutated converters. The strategy makes it possible to realize a significant reduction in power losses with lowest possible switching frequency in steady state, continuous operation with high speed tracking of commands in the transient state and flexible controls with the utilization of degrees of freedom in the assignment of voltage vectors to the converters. High efficiency of the strategy is confirmed by experiments in which two pulse switching mode and the speed of response in 5(ms) with one side model of the converter terminals of self-commutated HVDC ( High Voltage Direct Current ). The continuous operation is verified by simulations in a one-line ground fault. Another simulation based on the unbalanced dc voltages shows the balance control of dc voltages to be effective in HVDC transmission with self-commutated converters connected in series on the ac and the dc sides.

Modular multilevel converters technology: a comprehensive study on its topologies, modelling, control and applications

“…The various topologies of multilevel converters have been proposed as shown in Figs. 3-6 in which FC and NPC topologies are widely used in industrial and power applications [47][48][49][50]. Other multilevel VSC circuits are also proposed for HVDC applications as shown in Figs.…”

Genetic algorithm based control for VSC HVDC

“…In recent years enhanced HVDC systems, called Voltage Sourced Converter based HVDC (VSC HVDC), which use self-commutated converters, have become available for industrial applications [1] [2]. Compared with conventional HVDC, this new HVDC system adopting PWM (Pulse Width Modulation) control has following high performance [3] (1) The VSC converters will not fail to carry out commutation even when a voltage dip or waveform distortion has occurred in AC system.…”

“…The algebraic equations can be directly (2) written in single-phase equivalent since the quasi-static state condition is assumed. With reference to Fig.…”