Selective De-tuned Harmonics Compensation for Unbalanced Composite Loads

D. RAVICHANDRAN, N. Muruganantham

Abstract


Medium voltage industrial consumers for the demand up to 40 kW are experiencing several issues, including low power factor, increasing imbalance current, rising neutral current, limited utilization of active filters, and growing total harmonics distortion. Since most of the loads are current driven and prone to problems, this paper proposes a comprehensive solution using a straightforward analytical approach. The proposed solution involves a three-phase, 380 V supply system equivalent to a grid-tied renewable medium voltage supply system with both balanced non-linear loads and unbalanced linear loads.       

The problem is addressed by utilizing specifically designed compensators and de-tuned filters. Firstly, emphasis is placed on current balancing and power factor improvement up to unity. This is achieved by employing compensating network with carefully designed LC components. Secondly, a harmonics assessment is conducted on the total harmonics distortion of current and the identification of dominant characteristic harmonics through network simulations. Thirdly, the individual harmonics distortion, which indicates the harmonics content in each phase, is obtained from the simulation.  Frequency scanning is used to identify harmonics resonance in 5th-order harmonics in composite loads. The harmonics impedance values of the 5th-order harmonics are reduced by detuning the selected frequency between 3 % and 5 % in the design of filters. To validate the proposed solution, a test network is simulated using MATLAB Simulink, and results are verified for the recommended values of standard IEEE519.


Keywords


Total Harmonics Distortion (THD), Individual Harmonics Distortion (IHD), Harmonics Impedance, Detuned Filter, % Unbalance

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v14i3.14393.g8911

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