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Description
Transient stability is the capability of the electric grid to return to normal operating or equilibrium conditions after a fault is cleared. Voltage collapses at the fault location and fluctuates (dips) at other points in the event of a disturbance in an electric system. The system must recover the voltages at all buses in the shortest possible time to remain in synchronism with the entire grid. Integrating solar photovoltaic (PV) generation into the electric grid comes with interoperability challenges such as maintaining bus voltages, angles, and frequency stabilities within their nominal operating range. A balanced and stable electric grid is essential to reliably integrate large solar PV power plants into an electric network. In this study, a proposed 85 MW solar PV plant is modeled to replace the generator at bus 3 of the IEEE-9 bus system for the investigation of the transient stability of the grid. Two cases were established after a power flow study was completed to set as the base of this investigation. In case 1, a three-phase fault was simulated at 1.0 seconds on a high-voltage bus 9 while capacitor banks located on load buses (5, 6, and 8) remained unswitched after the disturbance was cleared 0.7 seconds later. The system failed to achieve stability for the entire simulated period of 60 seconds. Six scenarios performed under test case 2 considering different capacitor bank sizes and installation configurations. Switched capacitor banks among the six scenarios investigated recovered the point of interconnection (POI) bus voltage, angle, and frequency for approximately 70.5% of stability duration for the simulated period. The results obtained demonstrate that switched capacitor bank(s) at a suitable location(s) in an electric grid is capable of supporting voltage recovery after a system disturbance.
Publication Date
4-20-2021
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Publisher
Eastern Illinois University
City
Charleston
Keywords
Solar Photovoltaic, load flow, active power, reactive power, phase angle, bus voltage, frequency, transient stability, voltage stability, switched capacitor banks, 3-phase faults, steady-state stability, fault clearing time
Disciplines
Technology and Innovation
Recommended Citation
Ibrahim, Shaibu, "Study of Transient Stability of the Grid System under a Fault Condition with Utility-Scale Solar Photovoltaic (PV) Interconnection using Switched Capacitor Banks for Voltage Recovery" (2021). Sustainability Program Student Papers. 2.
https://thekeep.eiu.edu/sustainability_studentpapers/2
