Article,
Passivity-Based Analysis and Design of Linear Voltage Controllers For Voltage-Source Converters
Affiliations
- [1] AALBORG Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark [NORA names: AAU Aalborg University; University; Denmark; Europe, EU; Nordic; OECD]
Abstract
This article presents a systematic evaluation on the impedance passivity of voltage-controlled voltage-source converters. The commonly used single- and dual-loop control structures with different linear controllers are compared extensively, considering the effect of the time delay involved in the control loop. A virtual impedance control, co-designed with different voltage control schemes, is then proposed to eliminate the negative output resistance till half of the sampling frequency, which improves the system stability for grid-forming converters in grid-connected applications. Both frequency-domain analysis and experimental results validate the theoretical findings.
Keywords
Control systems,
Frequency control,
Frequency conversion,
Impedance,
Resonant frequency,
Time-frequency analysis,
Voltage control,
Voltage-source converter,
harmonic stability,
impedance analysis,
passivity,
voltage control