Enhancing Reactive Power Synchronization Control: Power Response Analysis and Improved Fast Voltage Support

As renewable energy integration increases, voltage source converters (VSCs) are gradually supplanting traditional synchronous generating units. VSCs controlled by phase-locked loop (PLL) combined with conventional vector current control (VCC) are unable to provide reactive support and voltage regulation during grid voltage drop scenarios. Within this article, reactive power synchronization control (RPSC) is utilized instead of PLL. The analysis investigates the phase output of RPSC and the reactive power produced by the converter amidst declining grid voltage conditions. The study illustrates that during voltage reductions, the RPSC output phase trails the phase of grid voltage by a constant angle, facilitating the converter output reactive power to naturally revert to its pre-voltage-drop level. Moreover, a rapid voltage support control strategy is suggested to hasten the transient response of RPSC and augment the converter’s active voltage support speed. Theoretical analyses are corroborated and the efficacy of the enhanced control strategy is affirmed through time-based simulations.