Design of a Harmonic Filter for a Grid Connected Doubly Fed Induction Generator under Unsymmetrical Fault Conditions
Chilla Soumya1, Ranuva Nageswara Rao2

1Chilla Soumya, Department of Electronics and Electrical Drives Branch in G. Narayanamma Institute of Technology and Science (G.N.I.T.S), Hyderabad, India.
2Ranuva Nageswara Rao, Associate Professor, Department of Electrical and Electronics Department at G. Narayanamma Institute of Technology and Science (G.N.I.T.S), Hyderabad, India.
Manuscript received on February 10, 2020. | Revised Manuscript received on February 23, 2020. | Manuscript published on March 10, 2020. | PP: 928-926 | Volume-9 Issue-5, March 2020. | Retrieval Number: E2546039520/2020©BEIESP | DOI: 10.35940/ijitee.E2546.039520
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Abstract: The analysis and controlling of harmonics in a doubly fed induction generator (DFIG) is studied under the unsymmetrical fault conditions in MATLAB/SIMULINK software. The proposed DFIG uses wind energy as the primary source for which is used for power generation. Wind energy is a non-polluting renewable energy resource that is available free of cost but when the wind is used, harmonics are introduced into the power system, so voltage imbalances occur in the grid. In order to mitigate the voltage imbalances (or) ripples in the voltage or current, LCL filters are introduced in the wind turbine because they are chiefly used for high power and low-frequency applications. Various unsymmetrical faults are simulated by referring the specifications selected and analysed with the tripping time for the desired duration of time in the circuit breaker, voltage and current waveforms are analysed only during the transient period on the basis of FFT analysis to know about THD content. 
Keywords: Average value model, DFIG, LCL filter, THD, Unsymmetrical faults.
Scope of the Article: Software design patterns