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Harmonics Mitigation Using MMc Based UPFc and Particle Swarm Optimization

Intelligent Automation & Soft computing 2023年第3期35卷 3429-3445页

作者： c.gnana thilaka M.Mary Linda Ponjesly college of Engineering Nagercoil629003India

The application of non-linear loads in the power electronic device causes serious harmonic issues in the power system since it has the intrinsic prop-erty of retrieving harmonic current and reactive power from Alternating current(Ac)supply that leads to voltage *** maintain a reliable powerﬂow in the power system,an innovative Uniﬁed Power Flow converter(UPFc)is uti-lized in this proposed *** conventional series converter is replaced with the Modular Multilevel converter(MMc)that improves the power handling capability and achieves higher modular level with minimized *** shunt compensator assists in minimizing the voltageﬂuctuations and maximizing the voltage stability under different load *** Direct Quadrature(DQ)theory is utilized in this study to separate the harmonic components by generating reference frame *** Proportional Integral(PI)controller aids in maintain-ing the direct current potential difference in the constant mode whereas the Pulse Width Modulation(PWM)generator helps in delivering optimized output to the *** gain parameters of PI controller are optimized with the aid of employ-ing Particle Swarm Optimization(PSO).The entire work is validated using MATLAB simulink and the obtained outcomes proves that this new UPFc is highly beneﬁcial in minimizing the distortions with reduced Total Harmonic Distortion(THD)of 2.21%.

关键词： UPFc PI controller PSO MMc DQ theory STATcOM

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Assessment of Background Radiation and Associated Dose Rates in Soil Samples from Norochcholai in the North Western coast of Sri Lanka

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Journal of Geoscience and Environment Protection 2022年第1期10卷 189-206页

作者： Thiwanka Weerakkody Senani Williams Tania Warnakulasuriya Shakila Priyadarshanee thilaka Attanayaka Indrani Dissanayake Vajira Waduge Rajitha Wickremasinghe Sri Lanka Atomic Energy Board Wellampitiya Sri Lanka Faculty of Medicine University of Kelaniya Kelaniya Sri Lanka

This study assesses radiation levels in soil, water and air in the Norochcholai, an area in Sri Lanka closest to the Kundankulam nuclear power plant, India which is situated in the North Western coast. This is important for monitoring radiation hazards and will be useful in case of a nuclear accident. Superficial soil and water samples from 23 locations were analyzed by Gamma spectrometry using HPGe detector. The activity concentrations of Th232, K40, Ra226 and Pb210 in the soil were 56.0 Bq·kg-1, 96.0 Bq·kg-1, 24.0 Bq·kg-1 and 27.0

关键词： Background Radiation Gamma Spectrometry Norochcholai Health Risk Radiological Indices

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