Bus Voltage Control with Zero Distortion for Single-Phase Solar Inverters

Single-phase voltage source inverters are commonly used for interfacing small distributed generation units to the grid. Instead of reducing the distortion by lowering the loop gain, the new controller employs a digital FIR filter that samples the bus voltage at an integer multiple of the second harmonic frequency. The operating principle and modulation scheme are described. A closed loop control method is developed to enhance twice the line frequency ripple power compensation performance.

The guide for the selection of the decoupling capacitance is also discussed. Simulations and experimental results are presented to show the effectiveness of the method. This paper shows that this can be done by using a voltage ripple estimator along with a larger bandwidth for the voltage control loop and additional measures.

The filter presents a notch that removes the second harmonic ripple, enabling a design that operates with zero distortion and high bandwidth simultaneously, and is suitable for inverters with small bus capacitors. The proposed controller is tested on a micro inverter prototype with a 300- Wphotovoltaic panel and a 20--µF bus capacitor.

By P. Kamalakar"Bus Voltage Control with Zero Distortion for Single-Phase Solar Inverters"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper URL: http://www.ijtsrd.com/papers/ijtsrd2505.pdf 

Direct URL: http://www.ijtsrd.com/engineering/electrical-engineering/2505/bus-voltage-control-with-zero-distortion-for-single-phase-solar-inverters/pkamalakar

UGC Approved Journal, Engineering Journal

Grid-Connected PV-Wind System with Implementation

Renewable energy sources are getting more and more widespread, mainly due to the fact that they generate energy by keeping the environment clean. Most of these systems have an isolation transformer included, which if excluded from the system would increase the efficiency and decrease the size of PV installations, furthermore it would lead to a lower cost for the whole investment. For safety reasons grid connected PV systems include galvanic isolation.

In case of transformerless inverters, the leakage ground current through the parasitic capacitance of the PV panels, can reach very high values. A common-mode model based on analytical approach is introduced, used to predict the common-mode behavior, at frequencies lower than 50kHz, of the selected topologies and to explain the influence of system imbalance on the leakage current.

It will be demonstrated that the neutral inductance has a crucial influence on the leakage current. Finally simulation results will be shown for the NPC multilevel inverter topology, emphasizing the low leakage current for the case of a grid connection without galvanic isolation.

By P. Kamalakar"Grid-Connected PV-Wind System with Implementation"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper  URL: http://www.ijtsrd.com/papers/ijtsrd2518.pdf 

Direct URL: http://www.ijtsrd.com/engineering/electrical-engineering/2518/grid-connected-pv-wind-system-with-implementation/pkamalakar

Open Access Journal, Engineering Journal

Audio Signal Denoising Algorithm by Adaptive Block Thresholding using STFT

In this work performance comparison of Time-frequency algorithms is presented for removal of Additive White Gaussian Noise. For better time-frequency resolution properties & better adaptability of STFT, it is used in this work. Most of the audio sound signals are too large to be processed entirely; for Mozart signal of 10 second sampled at 11 KHz will contain 11,000 samples. Processing such a large block of data demands rigorous requirements of hardware & software, also the execution time is very long, hence less speed.

Hence data is segmented into blocks & each block of data is then processed individually. The important task is to choose the block length. The signal is segmented into blocks, of optimal length & then, denoising is performed in STFT domain by thresholding the STFT coefficients. When each block is denoised by taking optimal window size or block size, it is further concluded that STFT based algorithm proposed here is superior in terms of quality of the denoised signal & the execution time.

It is observed that adaptive block hard type thresholding with STFT gives the best SNR for sound signal. It is further concluded that proposed algorithm performs better than other algorithms in respect of SNR & time of execution.

By Apoorva Athaley | Papiya Dutta"Audio Signal Denoising Algorithm by Adaptive Block Thresholding using STFT"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper URL: http://www.ijtsrd.com/papers/ijtsrd2512.pdf 

Direct URL: http://www.ijtsrd.com/engineering/electronics-and-communication-engineering/2512/audio-signal-denoising-algorithm-by-adaptive-block-thresholding-using-stft/apoorva-athaley

International Journal, Engineering Journal

To Study the Effect of Stress Concentration Factor on Mild Steel Due to Heat Treatment

The present work is to study the effect of various types of heat treatment processes on stress concentration factor (Kt) of a plate with a circular hole subjected to a uniform loading. Finite Element Analysis using ABAQUS 6.13-1 has been done in order to calculate, Kt for rectangular plates with holes of different diameters. Stress-Strain diagrams are generated from standard tensile specimens (ASTM E8) with Universal Testing machine (HEICO), before and after various types of heat treatment process.
Young's Modulus, Poisson's Ratio and the Plastic strain verses Stress are calculated from the Stress- strain diagram and feed as an Input parameter for the FEA analysis.

The results shows that the value of Kt for quenching has a higher value in comparison to room temperature mild steel specimen and the value of Kt for normalizing and annealing show a lower value in comparison to room temperature mild steel specimen.

By Aman Roy | Ranik Das | Pratick Chand Samanta | K. Bhattacharyya"To Study the Effect of Stress Concentration Factor on Mild Steel Due to Heat Treatment"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper URL: http://www.ijtsrd.com/papers/ijtsrd2506.pdf 

Direct URL: http://www.ijtsrd.com/engineering/mechanical-engineering/2506/to-study-the-effect-of-stress-concentration-factor-on-mild-steel-due-to-heat-treatment/aman-roy

Indexed Journal, Engineering Journal

Improved & Modified DEEC Protocol for Energy Efficient Clustering in WSN's

In this work, we propose M-DEEC (Modified Distributed Energy Efficient Clustering) protocol, a new variant of DEEC for WSN's. We propose this M-DEEC for three different segregation for the nodes to elongate the stability & lifetime of the network. Hence, it increases the heterogeneity & energy level of the network. Our proposed M-DEEC scheme is based on DEEC with the extension of new types of nodes named super nodes. We have extended the DEEC to three-level heterogeneity.

These super nodes have more energy than normal & advanced nodes & respective probabilities. Different simulation for the various values of a, b, m & mo has been carried out. For all the combination the proposed M-DEEC outperforms other protocol, as well as classical DEEC.

By Amee Vishwakarma | Papiya Dutta "Improved & Modified DEEC Protocol for Energy Efficient Clustering in WSN's "

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper URL: http://www.ijtsrd.com/papers/ijtsrd2480.pdf 

Direct URL: http://www.ijtsrd.com/engineering/electronics-and-communication-engineering/2480/improved-and-modified-deec-protocol-for-energy-efficient-clustering-in-wsn's-/amee-vishwakarma

Call For Paper, Engineering Journal

Frequency Regulation in Wind Turbine and Steam Turbine based Power System

In recent years the electrical power generation from renewable energy sources, such as wind, is increasingly attracting interest because of environmental problem and shortage of traditional energy source in the near future. Wind turbine has a great impact on frequency regulation as a non-conventional energy source. Frequency regulation is to regulate the power output of the electric generator within an area in response to changes in system frequency and tie-line power.

Therefore, the objectives of load frequency control are to minimize the transient deviations (area frequency and tie-line power interchange) and to ensure their steady state errors to be zeros. Many controllers have already been proposed in earlier studies. This paper proposes a controller based on de-loading of turbines for better dynamic response.

This paper presents a solution to the LFC problem of wind turbine and steam turbine connected power system based on sudden load change and sudden wind speed variations in the power system. The dynamic model of the power system and the controller design based on the model are elaborated in the paper. Simulation results and frequency-domain analyses proved that proposed scheme is attractive to the LFC problem in its stability and robustness.

By Faisal Mushtaq Raina | Gagan Deep Yadav"Frequency Regulation in Wind Turbine and Steam Turbine based Power System"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper URL: http://www.ijtsrd.com/papers/ijtsrd2412.pdf 

Direct URL: http://www.ijtsrd.com/engineering/electrical-engineering/2412/frequency-regulation-in-wind-turbine-and-steam-turbine-based-power-system/faisal-mushtaq-raina

UGC Approved Journal, Engineering Journal

A Design and Implementation of Reversible Logic Based Combinational Circuit with low Quantum Cost

In the field of cryptography, optical information processing low power CMOS design and nanotechnology Reversible logic has found its applications and has become one of the promising research directions This paper presents a novel and quantum cost efficient combinational circuits for nanotechnology. This gate can work singly as a reversible full adder unit and requires only one clock cycle. The proposed gate is a universal gate in the sense that it can be used to synthesize any arbitrary Boolean functions.

It has been demonstrated that the hardware complexity offered by the proposed gate is less than the existing counterparts. The proposed reversible circuits are then compared with different reversible circuits

By Ankita Jain | Ashish Raghuwanshi"A Design and Implementation of Reversible Logic Based Combinational Circuit with low Quantum Cost"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6 , October 2017,

Paper URL: http://www.ijtsrd.com/papers/ijtsrd2477.pdf 

Direct URL: http://www.ijtsrd.com/engineering/electronics-and-communication-engineering/2477/a-design-and-implementation-of-reversible-logic-based-combinational-circuit-with-low-quantum-cost/ankita-jain

Open Access Journal, Engineering Journal