Interline Photovoltaic (I-PV) Power Plants: A New Concept of PV Power

  • Ahmed Moawwad Zidan

Student thesis: Master's Thesis

Abstract

This thesis illustrates possible configurations for large-scale photovoltaic (PV) power plant, to operate as a flexible AC transmission system (FACTS) device in addition to operating as a source of renewable power generation. The newly developed system where inverter modules are connected in back to back is addressed as Interline-PV (I-PV) system. Based on the inverter reconfiguration, three distinct topologies can be realized, namely, (i) Shunt I-PV, (ii) Series I-PV and (iii) Shunt- Series I-PV. These configurations enable the PV power plant to operate through two adjacent power system networks/feeders. This will allow managing the flow of both active and reactive power between these feeders. For the distribution systems with low X/R ratio, the coupling effect between active and reactive powers cannot be ignored. The conventional P-V and Q-V droop methods to regulate the point of common coupling (PCC) voltage with automatic load sharing may not perform as desired under such a situation of low X/R ratio. A P-Q-V droop control method is thus proposed, especially for system with low X/R ratio, to facilitate simultaneous active and reactive power control to regulate the PCC voltage. A lookup table based approach is developed and implemented to determine the P and Q droop coefficients. Furthermore, it is shown that the I-PV power plants can also be utilized to compensate an unbalance in the PCC voltages caused by unbalanced loads. A negative sequence current estimation based controller is developed to compensate for unbalanced conditions. The MATLAB/Simulink based simulation model is developed to evaluate the performance of the system with the proposed configurations and controllers.
Date of Award2012
Original languageAmerican English
SupervisorVinod Khadkikar (Supervisor)

Keywords

  • Photovoltaic Cells

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