Mechanism Analysis of Wind Turbine Var Oscillations
- Department of Electrical Engineering, University of South Florida, Tampa, FL, USA
- National Renewable Energy Lab, USA
Electromagnetic transient simulation of parallel connected 4-MW type-3 wind turbines based on original equipment manufacturer's real-code turbine model shows 1.2-Hz turbine-turbine oscillations in reactive power. This letter reveals why such oscillations occur in the individual var measurement, while being insignificant in the total var measurement, regardless of the varying grid impedance. We adopt two analysis approaches: open-loop single-input single-output analysis and network decomposition. The two approaches differ in their treatment of turbine-network interaction. The open-loop analysis shows that the turbine-turbine oscillation mode is due to an open-loop system pole being attracted to an open-loop system zero. Furthermore, we use network decomposition method to explain why this mode is observable in individual vars while not observable in the total var. The entire system of n -turbines can be viewed as n decoupled circuits. For the two-turbine case, the system has an aggregated mode and a turbine-turbine oscillation mode. Here, the aggregated mode is associated with a circuit associated with the total var, while the turbine-turbine oscillation mode is associated with the var difference and is insensitive to the grid parameters.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office Office
- DOE Contract Number:
- EE0008771; AC36-08GO28308
- OSTI ID:
- 1924451
- Report Number(s):
- NREL/JA-5D00-82903; MainId:83676; UUID:c46fc3b4-789d-4dfd-9f70-10f196e865f5; MainAdminID:68733
- Journal Information:
- IEEE Translations on Industrial Electronics, Journal Name: IEEE Translations on Industrial Electronics; ISSN 0278-0046
- Publisher:
- IEEE
- Country of Publication:
- United States
- Language:
- English
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