Multisampled current control of grid-following voltage source converters

Pulse width modulation (PWM)–based current control is widely used in grid-following voltage source converters (VSCs). However, a large control delay is induced in the regular PWM process, which limits the current control bandwidth and deteriorates VSC-grid interactive stability. Multisampling PWM is a potential candidate to reduce the control delay, and state variables are sampled multiple times within one switching period. In this chapter, the internal mechanism of multisampling PWM is revealed, and two low phase–lag digital filters are introduced to suppress low-order aliasing. Based on that, passivity-based multisampling damping strategies controlling converter-side current and grid-side current are presented with high stability robustness.