Abstract
The use of renewable power sources, like wind power, has been increased recently due to climatic changes caused by fossil fuels and fast depletion of fossil fuels. This has lead to the tremendous increase in the interconnection of wind turbines to power system grid. This interconnection on a large number in to grid causes problems such as power quality, maintaining system voltage, reactive power compensation, control of grid frequency and aspects of power system grid stability. In this proposed scheme, a fuzzy logic based controller is employed for a STATCOM to improve the power quality. The proposed control scheme supplies the required reactive power to the system and thus relieves the source, leading to Unity Power Factor (UPF) at the source and also it injects currents to reduce total harmonic distortion (THD) to satisfy IEC standard. For extracting the reference currents, an instantaneous reactive power theory based control algorithm is employed. To determine the effectiveness of the proposed fuzzy logic controller, a comparative analysis is also performed with a PI controller and the results have been presented.
Highlights
Concern for increasing price of energy, climatic changes because of fossil fuels, rapid decline of fossil fuel reserves and the need to decrease green house gas emissions, these factors lead to the rapid growth of the sustainable energy sector
The system considered for power quality improvement, as shown in Figure 1, is simulated using
To have the comparative analysis of the performance of the proposed Fuzzy Logic Controller (FLC) based STATCOM with Instantaneous Reactive Power Theory (IRPT) based control scheme, the proposed system is simulated without STATCOM and with PI controller STATCOM
Summary
Concern for increasing price of energy, climatic changes because of fossil fuels, rapid decline of fossil fuel reserves and the need to decrease green house gas emissions, these factors lead to the rapid growth of the sustainable energy sector. In [14], a STATCOM has been utilized to mitigate the voltage fluctuations and to improve fault ride through capability of grid connected wind farm with fixed speed IG. In [15], a STATCOM is utilized to overcome the PQ problems like voltage fluctuations and harmonics, but here the authors did not provide many details about control strategy employed. Achieving the required power quality norms and reactive power compensation of the grid connected WECS using Fuzzy Logic Controller (FLC) based STATCOM by employing IRPT for extracting the reference currents for grid synchronisation has received a very little research attention. WECS with induction generator, connected to the grid consisting of the nonlinear load is considered for detailed study of the associated PQ problems and reactive power compensation. To determine the effectiveness of the proposed FLC, a comparative analysis is performed with a PI controller
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