Modelling and analysis of fault ride through techniques in a power network with Type 4 wind generation

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Date
2023-08-06
Authors
Shilpi, Pravakar Soumya
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Abstract

The increasing penetration of renewable energy sources, particularly wind power, necessitates the development of efficient control strategies and system stability improvements. This thesis presents a comprehensive investigation into the modelling and analyzing the fault ride-through techniques in Type 4 wind generators. The Type 4 wind generator, which incorporates a permanent magnet synchronous generator (PMSG), has emerged as a promising solution for renewable energy generation. The objective is to investigate the transient behaviour of the wind generator and develop strategies to incorporate its fault ride-through capabilities. Various control strategies are examined, including maximum power point tracking, dc chopper control, and active and reactive power control. Electromagnetic simulations (EMT) simulation studies and validations will be conducted to evaluate the performance of these control strategies under different operating conditions. Today, renewable energy systems, including wind generators, are expected to meet the same reliability standards as traditional power systems. IEEE Standard 1547-2018 suggests that the wind generator must maintain its connection to the grid during minor faults or disturbances within the specified voltage limits. The Type 4 wind generator consists of a fully controlled back-to-back configuration-based voltage source converter; the abilities of the converter can be used to detect the severity of the disturbance and react accordingly. This thesis implements the low and high-voltage ride-through and the frequency ride-through capabilities of the Type 4 wind generator as per the IEEE Std 1547-2018. Lastly, the thesis presents a novel approach that utilizes a dc chopper-based active power modulation technique. The effectiveness of this technique in damping power system oscillations and reducing the rise in frequency variations during some contingencies is investigated in a power network with Type 4 wind generators.

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Fault ride through capabilities, Type 4 wind generators, MPPT, dc chopper, LVRT, FRT, Active power modulation, Power oscillation damping
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