Abstract
The purpose of this paper is to assess the impact of proportional resonant controller (PR) parameters of a Voltage Source Converter (VSC) and AC grid topology on the small signal stability of a VSC-AC system. Based on this, a small signal model is constructed, step by step, and validated against EMT simulations. Following this validation, several scenarios containing different PR controller gains are proposed and compared by means of trajectory of eigenvalues. A discussion of the best adequacy of PR controller parameters and AC grid strength in combination with inductive-resistive characteristic (X/R) is developed to ensure the stability of the system. The previous eigenvalue analysis is verified in time domain by means of EMT simulations. The analysis performed concludes that, while the AC grid strength in combination with PR controller parameters plays an important role in determination of stability, variations in the inductive-resistive AC grid characteristic need to be included in the analysis, since further instabilities can appear even when the PR controller is well designed for a specific AC grid configuration.
| Original language | English |
|---|---|
| Article number | 105746 |
| Pages (from-to) | 105746 |
| Number of pages | 1 |
| Journal | International Journal of Electrical Power and Energy Systems |
| Volume | 118 |
| DOIs | |
| Publication status | Published - Jun 2020 |
Keywords
- AC grid strength
- Modal analysis
- Proportional-resonant controller
- Small signal
- VSC
Project and Funding Information
- Funding Info
- The authors thank the support from the Basque Government (projects: ELKARTEK KK-2017/00083 and Road2DC. KK-2018/00083 and research group GISEL ref. IT1083-16) and from the Ministry of Economy, Industry and Competitiveness (project ENE2016-79145-R AEFI/FEDER, UE).