Passivity-Based Analysis and Design of Linear Voltage Controllers For Voltage-Source Converters
Yicheng Liao, Xiongfei Wang, Frede Blaabjerg
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.
Topics & Concepts
PassivityConvertersControl theory (sociology)Voltage sourceElectrical impedanceVoltageMesh analysisGridOutput impedanceFrequency domainDual (grammatical number)Computer scienceEngineeringElectronic engineeringControl (management)Voltage droopMathematicsElectrical engineeringArtificial intelligenceArtGeometryLiteratureComputer visionMicrogrid Control and OptimizationIslanding Detection in Power SystemsAdvanced DC-DC Converters