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Abstract

Wind generators are very popular in most parts of the world as distributed generations (DG) owing to their technological advancement for grid integration, minimal environmental impact and free abundant availability. These wind generators usually employ induction machine for their electric power conversion due to its control simplicity and robustness in construction. The power output of such induction generator based wind turbine generator system (WTGS), depends on the node voltage and frequency of the connected radial distribution system (RDS). The node voltages of RDS are however subject to change due to variations in loading conditions. Therefore, a requirement arises to analyze the resulting mutual effect on the node voltages of RDS embedded with DG during such grid perturbations. Hence, the consequences of DG on the node voltages of RDS under anticipated small grid perturbations such as slow variation in grid frequency and connected loads are presented in this paper. The analysis is carried out on a practical Indian 25 bus radial distribution system embedded with different types of DG. From the results presented, it is observed that RDS embedded with fixed speed stall regulated WTGS are largely prone to voltage deviations at all nodes.

Keywords

Radial Distribution System Distributed Generation Voltage Stability Index Load Flow Analysis Wind Turbine Generator System

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Grid Integration of Distributed Generation—Consequences on Node Voltage under Grid Perturbations

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