Relaxed Robust Control with Pragmatic Shortage of Passivity for Wind, Storage and PV Power Converters

Abstract:
Passivity is gaining attention in the scenario of massive integration of inverter-based resources. Designing a power converter with passive input impedance is sufficient for stability, but not necessary. In fact, passive designs tend to conservatism providing degraded performance (high fault currents, slower settling times, etc). This paper analyzes the trade-off between passivity and performance. Taking advance of the inherent damping of transmission lines, a robust stability index, more relaxed than passivity, is used to tune the converter inner controller applying modern control optimization techniques. A good balance is hence obtained between performance and robust stability.