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Abstract
In this paper, a cost-effective control scheme for two-stage grid-connected PhotoVoltaic (PV) systems in Low Voltage Ride-Through (LVRT) operation is proposed. In the case of LVRT, the active power injection by PV panels should be limited to prevent from inverter over-current and also energy aggregation at the dc-link, which will challenge the dc-link capacitor lifetime if remains uncontrolled. At the same time, reactive currents should be injected upon any demand imposed by the system operators. In the proposed scheme, the two objectives can be feasibly achieved. The active power is regulated automatically through a proportional controller according to the voltage sag level and PV inherent characteristics (i.e., the voltage and power droop). Compared to prior-art LVRT schemes, the proposed method is cost-effective, as it is achieved by simply plugging the proportional controller into a maximum power point tracking controller without significant hardware or software modifications. In this way, the PV system will not operate at the maximum power point, whereas the inverter will not face any over-current challenge but can provide reactive power support in response to the grid voltage fault. Simulations have been performed on a 3-kW two-stage grid-connected single-phase PV system in the case of LVRT operation, where the results have verified the proposed control scheme in terms of fast dynamics and seamless operation mode transitions.
Original language | English |
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Title of host publication | Proceedings of the 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) |
Number of pages | 7 |
Publisher | IEEE Press |
Publication date | Mar 2017 |
Pages | 3582-3588 |
ISBN (Print) | 978-1-5090-5366-7 |
DOIs | |
Publication status | Published - Mar 2017 |
Event | 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) - Tampa Convention Center, Tampa, FL, United States Duration: 26 Mar 2017 → 30 Mar 2017 |
Conference
Conference | 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) |
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Location | Tampa Convention Center |
Country/Territory | United States |
City | Tampa, FL |
Period | 26/03/2017 → 30/03/2017 |
Series | IEEE Applied Power Electronics Conference and Exposition (APEC) |
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Volume | 2017 |
ISSN | 2470-6647 |
Keywords
- Low voltage ride-through
- Active power control
- Grid-connected photovoltaic (PV) systems
- Droop characteristics
- Maximum power point tracking
- Two-stage PV systems
Fingerprint
Dive into the research topics of 'Low Voltage Ride-Through of Two-Stage Grid-Connected Photovoltaic Systems Through the Inherent Linear Power-Voltage Characteristic'. Together they form a unique fingerprint.Projects
- 1 Finished
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PV2GRID: A Next-Generation Grid Side Converter with Advanced Control and Power Quality Capabilities
Blaabjerg, F., Yang, Y. & Sangwongwanich, A.
01/01/2015 → 30/09/2017
Project: Research