Abstract
With the increased installation of voltage source converters (VSCs) into the power grid, concerns about resonance/stability issues associated with interactions among converters, and between them and the ac grid is growing. The prevailing method for investigating these issues is the impedance modeling of VSCs, which involves linearizing all their control elements, such as their current control and grid synchronization system among others. In this process, most often a phase-locked loop (PLL) is considered for the grid synchronization of VSCs in the literature. The available options for the grid synchronization, however, are not limited to PLLs; a large number of frequency-locked loops (FLLs) for the grid synchronization of VSCs may also be found in the literature. The impedance modeling of three-phase VSCs equipped with FLL-based grid synchronization systems can be quite challenging as FLLs have different structures compared to PLLs. This article aims to address this difficulty. The general idea is obtaining the PLL counterparts of FLLs, which makes the VSC impedance modeling very straightforward. To make this idea clear, several case studies are presented and investigated.
Original language | English |
---|---|
Journal | IEEE Transactions on Power Electronics |
Volume | 37 |
Issue number | 4 |
Pages (from-to) | 4511-4525 |
Number of pages | 15 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - 1 Apr 2022 |
Bibliographical note
Publisher Copyright:IEEE
Keywords
- Adaptive filters
- Computational modeling
- Converters
- Frequency locked loops
- frequency-locked loops (FLLs)
- grid synchronization
- Impedance
- impedance model
- linearization
- observers
- Phase locked loops
- phase-locked loops (PLLs)
- Power conversion
- stability
- Synchronization
- synchronous reference frame (SRF)
- three-phase systems
- voltage source converter (VSC)