Abstract
This paper addresses the harmonic current control for LCL-filtered Voltage-Source Converters (VSCs) connected to ultra-weak (high-impedance) grids. It is shown that the harmonic current controllers tend to be unstable as the Short-Circuit Ratio (SCR) of the system reduces. An active stabilizing control scheme is thus proposed by feeding back the filter capacitor voltage and the converter-side current. The method not only stabilizes the harmonic current control with a wide range of SCR values, but also mitigates harmonic distortions in the grid-side current of the VSC. The stabilizing mechanism of the approach is elaborated by the impedance-based analysis. The time domain simulations and experiments corroborate the theoretical analysis.
| Original language | English |
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| Title of host publication | Proceedings of 2017 IEEE Energy Conversion Congress and Exposition (ECCE) |
| Publisher | IEEE Press |
| Publication date | Oct 2017 |
| ISBN (Electronic) | 978-1-5090-2998-3 |
| DOIs | |
| Publication status | Published - Oct 2017 |
| Event | 2017 IEEE Energy Conversion Congress and Exposition (ECCE) - Cincinnati, Ohio, United States Duration: 1 Oct 2017 → 5 Oct 2017 |
Conference
| Conference | 2017 IEEE Energy Conversion Congress and Exposition (ECCE) |
|---|---|
| Country/Territory | United States |
| City | Cincinnati, Ohio |
| Period | 01/10/2017 → 05/10/2017 |
Keywords
- Voltage-Source Converter (VSC)
- Harmonics
- Grid
- Current control
- Stability