DC-Side Impedance Interaction Analysis in an MMC-Based Back-to-Back VSC-HVDC System
- Resource Type
- Authors
- Staffan Norrga; Hans-Peter Nee; Mehrdad Nahalparvari; Mohsen Asoodar
- Source
- IECON
- Subject
- Harmonic analysis
Control theory
business.industry
Computer science
Stability criterion
Harmonic
High-voltage direct current
Voltage source
Modular design
Converters
business
Electrical impedance
- Language
In this paper, harmonic stability of a back-to-back modular multilevel converter based voltage source converter high voltage direct current system is analyzed. These systems are prone to ac- and dc-side resonances and interactions between the converter and its interconnected systems. The stability of the system can be predicted by the impedance based stability criterion, which requires the modeled or measured converter impedance. The analysis in this paper focuses on interoperability when the converters employ different control schemes in order to utilize the inherent damping properties of the sum capacitor voltage balancing control loops.