Extended Frequency Divider for Bus Frequency Estimation Considering Virtual Inertia from DFIGs

Conference · Mon Oct 04 04:00:00 EDT 2021

DOI:https://doi.org/10.1109/ISGTLatinAmerica52371.2021.9543055· OSTI ID:1832444

Tan, Bendong; Zhao, Junbo; Milano, Federico; Lai, Qiupin; Zhang, Yingchen; Maldonado, Daniel Adrian

Accurate estimation of local bus frequency is important for effectively controlling both synchronous and nonsynchronous generators. As the power grid evolves to accommodate essential reliability services such as virtual inertia from nonsynchronous generators, conventional techniques to estimate frequency face challenges. This paper proposes a new frequency estimation method that can effectively include the inertia contributions from double-fed wind generators (DFIGs). This is achieved through the proposed extended frequency divider formula (FDF) to include the contributions of DFIGs via Thevenin equivalents. The proposed extended FDF does not suffer from numerical issues as compared to existing phasor angle derivative-based approaches. Moreover, the knowledge of the rotor speeds of the synchronous machine and DFIGs as well as of the network admittance matrix allows estimating the frequencies of all buses in the grid, thereby significantly improving system situational awareness with a limited number of measurements. Numerical results on the IEEE 39-bus power system with DFIGs show that the proposed method achieves more accurate bus frequency estimations than the original FDF formula and other approaches based on the numerical derivation of the bus voltage phase angles.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1832444
• Report Number(s): NREL/CP-5D00-81524; MainId:82297; UUID:72db3618-fcc6-4287-b60d-25d07dcf255e; MainAdminID:63350
• Country of Publication: United States
• Language: English

Related Subjects

POWER TRANSMISSION AND DISTRIBUTION
Thevenin equivalent
double-fed induction generator
frequency estimation
inertial emulation