Solar-PV inverter for the overall stability of power systems with intelligent MPPT control of DC-link capacitor voltage

• Published in: Protection and control of modern power systems Vol. 8; no. 1; p. 15
• Main Authors: Singh, Sheetal, Saini, Sanju, Gupta, S. K., Kumar, Rajeev
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2023; Power System Protection and Control Press
• Subjects: Active control; Algorithms; Alternative energy sources; Capacitors; Deviation; Electric power systems; Electrical Machines and Networks; Energy; Energy Systems; Farms; Fault detection; Inverters; Maximum power tracking; Optimal control; Optimization; Optimization techniques; Original Research; Power Electronics; Power plants; Reactive power; Renewable and Green Energy; Rotors; Solar energy; Solar power; Solar power generation; Systems stability; Torsional oscillations; Tracking control; Turbogenerators; Voltage collapse; Grid-connected system; Rotor dynamics; PV-STATCOM; Power oscillations; BFO algorithm
• ISSN: 2367-2617; 2367-0983; 2367-0983
• DOI: 10.1186/s41601-023-00285-y

This paper demonstrates the controlling abilities of a large PV-farm as a Solar-PV inverter for mitigating the chaotic electrical, electromechanical, and torsional oscillations including Subsynchronous resonance in a turbogenerator-based power system. The oscillations include deviations in the machine speed, rotor angle, voltage fluctuations (leading to voltage collapse), and torsional modes. During the night with no solar power generation, the PV-plant switches to PV-STATCOM mode and works as a Solar-PV inverter at its full capacity to attenuate the oscillations. During full sun in the daytime, on any fault detection, the PV-plant responds instantly and stops generating power to work as a Solar-PV inverter. The PV-farm operates in the same mode until the oscillations are fully alleviated. This paper manifests the control of the DC-link capacitor voltage of the Solar-PV inverter with a bacterial foraging optimization-based intelligent maximum power point tracking controller for the optimal control of active and reactive power. Kundur’s multi-machine model aggregated with PV-plant is modeled in the Matlab/Simulink environment to examine the rotor swing deviations with associated shaft segments. The results for different test cases of interest demonstrate the positive outcomes of deploying large PV-farms as a smart PV-STATCOM for controlling power system oscillations.