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Dynamic Modeling and Stability Analysis of PV Plants and their Impact on Network Stability

Poorheydari, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52975 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Due to the growing rate of photovoltaic plants in power systems, in the future years this type of plant will have significant contribution in electrical energy generation. For this reason, the impact of photovoltaic plants on various aspects of power system operation should be investigated. In this research dynamic impacts of photovoltaic plants on small signal stability of power systems are analyzed. For this purpose, improved dynamic equivalent models are developed for large-scale photovoltaic plants, based on integration of the plant modules. It is shown that the usual assumption of ideal DC power supply at the input of plant inverter is inappropriate, and that the DC-DC converter and DC link capacitor dynamics need to modeled. The next step is enhancement of power oscillation damping of power system with auxiliary damping controller on the PV inverter. It is shown that use of stored energy in dc-link capacitors can reduce or eliminate the need for the storage system to improve power system oscillation. Another result of this research is to demonstrate the possibility of subsynchronous resonance with photovoltaic sources. By modeling the dc side components of photovoltaic power plants, dynamic oscillations can be seen in the sub-synchronous range, which can interfere with the torsional modes and lead to the instability of these modes
  9. Keywords:
  10. Power System Stability ; Dynamic Modeling ; Large-Scale Photovoltaic park ; Sub Syncoronous Resonance (SSR) ; Direct Current Link Capacitance ; Energy Production

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