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Nagarajan, G.
- Improved Power Quality Solutions for Power Distribution System Using Shunt Active Filter
Authors
1 Sathyabama University, Chennai, IN
Source
Programmable Device Circuits and Systems, Vol 4, No 3 (2012), Pagination: 128-130Abstract
This project presents a technique for Harmonic compensation and power factor correction of non linear loads employing Hybrid Shunt Active Power Filter. This work will focus on the design methodology and the analysis of control strategy which allows the compensation of harmonics and phase displacement of the input current, for non-linear loads. The topology of filter is based on a single phase current controlled VSI inverter with MOSFETs/IGBTs switches. Simple time domain extraction techniques are used to determine the harmonic components present in the load current or source current/voltage. The pulse width modulated (PWM) technique is then used to generate the required gate drive signals to the converter. Power factor and Harmonics problem in industrial power systems with non-linear loads is presented. Traditional and modern advanced technologies for power factor improvement and harmonic mitigation are reviewed. Advantages of power electronics based static reactive power compensation and Active Harmonic Filtering are shown. Design issues for power electronics converter operating as static compensator-Active filter are discussed. Modeling and experiment results are presented for both advanced technologies.Keywords
Distribution Lines, Power Distribution Systems, Shunt Active Filters.
- Green Cooperative Spectrum Sensing for Control Channel Design in CRN
Authors
1 Department of Electronics & Communication, Pondicherry Engineering College, Puducherry - 605 104, IN
Source
Programmable Device Circuits and Systems, Vol 9, No 2 (2017), Pagination: 17-21Abstract
A software radio that is capable to be aware of the surrounding environment is termed as cognitive radio. It is a radio that changes PHY layer properties based on environment and traffic needs. Allocated users (PU) and unallocated users (SU) should coexist each other and share the spectrum to avoid interference. Coexistence between users necessitates the spectrum sensing. Multicarrier is used for channel sensing. As Orthogonal Frequency Division Multiplexing based sensing has loss in bandwidth, Filter Bank Multi Carrier based sensing is suggested as a suitable method for control channel. Interference between PU and SU are avoided by proper filtering methods. Hidden terminal problem that occurs in the network can be avoided by Cooperative Spectrum Sensing (CSS). An optimal fusion rule to improve the performance of FBMC is analyzed. Voting rule is also applied for fusion CSS under AWGN channel. Noises are added in the path to test the concept of interference to PU. Results prove the need of FBMC and sensing for the control channel design. Wastage of power is minimized in the network which defines the term of Green Sensing.