Journal
IET POWER ELECTRONICS
Volume 10, Issue 8, Pages 894-902Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2016.0475
Keywords
voltage-source convertors; power system stability; power grids; stability criteria; RLC circuits; damping; electric current control; phase locked loops; time-domain analysis; power system simulation; power generation control; power conversion; physical interpretation; dynamic interactions; voltage source converters; electrical oscillation; stability control; power conversion; renewable power generation; RPG systems; power electronic devices; power grid; resistance-inductance-capacitance circuits; small-signal model; VSC-grid system; virtual passive element effects; RLC circuit; damping characteristics; current controller; phase-locked loop; critical stability criterion; PLL bandwidth determination; VSC stabiliser; time-domain simulations; PSCAD-EMTDC simulations
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Funding
- Delta Environmental & Educational Foundation [DREM2016005]
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Voltage source converters (VSCs) play an important role in the power conversion of renewable power generation (RPG) systems. Conventional power systems are considerably affected by power electronic devices in systems with a high percentage of RPG. Various abnormal interactions in the form of oscillations between VSCs and grid have been reported, whereas the mechanism at the core is still lacking understanding. In this study, the properties of interactions between the VSC and grid are investigated, and through an analytical model the mechanisms of electrical oscillations are revealed. First, a simple resistance-inductance-capacitance (RLC) equivalent to the small-signal model of VSC-grid system was derived based on the knowledge of virtual passive element effects of VSC. Then, an intrinsic oscillatory point in the RLC circuit was identified, the damping characteristics of the current controller and phase-locked-loop (PLL) at this point were analysed. Subsequently, a critical stability criterion for the determination of PLL bandwidth that may trigger oscillations was established. For the improvement of the overall damping, a VSC stabiliser was proposed. Finally, the mechanism analysis and analytical criteria were verified by time-domain simulations in PSCAD/EMTDC.
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