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A Variable Charging Strategy Method for Hybrid Power Generation Systems

International Journal of Electrical and Computer Engineering (IJECE) Vol 2, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Standalone diesel generators (DGs) are widely utilized in remote areas in Indonesia. Some areas use microhydro (MH) systems with DGs backup.  However, highly diesel fuel price makes such systems become uneconomical. This paper introduces hybrid photovoltaic (PV)/MH/ DG/battery systems with a variable charging strategy method to minimize the diesel fuel consumption. The method is applied to control the state of charge (SOC) level of the battery based on its previous level and the demand load condition to optimize the DG operation. The optimal operation shows that the hybrid PV/MH/DG/battery with the variable charging strategy needs less fuel consumption than PV/MH/DG and MH/DG systems

Multiple Switching Patterns for SHEPWM Inverters Using Differential Evolution Algorithms

International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 1, No 2: December 2011
Publisher : Institute of Advanced Engineering and Science

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Abstract

An investigation on multiple patterns for both odd and even number of switching angles in a three-phase selective harmonic elimination pulse width modulation (SHEPWM) inverter is presented. The switching patterns are examined and classified on the basis of the harmonic performance of the waveforms output from the inverter. Differential evolution algorithms are employed to calculate the optimum switching angles. Selected cases are verified experimentally by a digital signal processor-based hardware implementation. The experimental results show that all types of the patterns offer low harmonic distortions on the inverter output after filtering.  However, one type gives better harmonic performance is identified.

Pembuatan Model Transien Mesin Induksi Menggunakan PSPICE

Jurnal ELKHA Vol 2, No 1 (2010): Edisi Bulan Maret
Publisher : Fakultas Teknik Jurusan Teknik Elektro

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Abstract

Abstract– For the investigation of transient in a complex system, a circuit based simulation program may be a skillful tool. PSPICE has large libraries of the electronic component’s models, but only few models of electromechanical devices are available there. Therefore to generate a model of the induction machine is important. All non-electrical parameters must be replaced by electrical terms in the PSPICE model. Mechanical equations of the induction machine can be realized by either basic capacitance or inductance circuit topology.  The complete model can be used to simulate the electrical and mechanical transient response of the induction machine. Keywords– model, transient , induction machine, PSPICE

Solution Trajectories for a Single-Phase Programmed PWM Inverter

TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper presents solution trajectories for programmed PWM technique to eliminate specific order harmonics in a single phase inverter. Evolutionary algorithm is applied to determine optimum switching angles in order to elmininate low order harmonics for modulation index: -1 £ M £ +1. An implementation using a DE2-115 Cyclone IVE FPGA device is also reported in this paper. The experimental results show that the technique effectively eliminates the specific harmonics, and offers low harmonic distortions on the inverter output after filtering.

A Grid-Connected Photovoltaic Interface System for Delivering Active and Reactive Powers

International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 3: September 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper presents a grid-connected photovoltaic (PV) interface for delivering both active and reactive powers. The PV interface employs H-bridge topology DC-DC converter and inverter with analog control technology. The power flow is controlled solely by the adjustable DC output voltage of the DC to DC converter. In order to evaluate the PV interface system’s performances, it is tested by delivering power to the grid with low pawer factor. The experimental results show that at 300W active load, the inverter could deliver the reactive power of 400VAR. The PV interface could also produce very low harmonic voltage and current distorsions. The laboratory measurements show that the total harmonic distortions of inverter output voltage and current are 0.46% and 0.05%, respectively

Migrasi Baterai Lithium dari Mode Otomotif ke Mode Penyimpan Energi untuk Sistem Pembangkit Listrik Tenaga Surya

ELKHA Vol 8, No 2 (2016): Edisi Bulan Oktober 2016
Publisher : Tanjungpura University

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Abstract

Abstract– Baterai Lithium dapat bekerja pada dua mode operasi, yaitu: mode otomotif (MO) dan mode penyimpan energi (MP). Kerja MO untuk mengasut mesin kendaraan dengan arus besar pada periode sesaat, sedangkan kerja MP berfungsi menyimpan dan memasok energi listrik kepada beban dalam jangka waktu tertentu. Karena beroperasi pada arus besar, maka siklus pakai baterai MO akan berkurang lebih cepat daripada MP. Pada makalah ini diperkenalkan model dua-fasa MO-MP dan strategi untuk mendapatkan titik alih terbaik dari MO ke MP pada Pembangkit Listrik Tenaga Surya (PLTS) dengan memperhitungkan tingkat efisiensi dan State of Health (SOH) baterai. Hasil analisis menunjukkan bahwa model-400 (MO 400 siklus/MP 800 siklus) memiliki kinerja terbaik ditinjau dari tingkat efisiensi dan SOH. Keywords– Baterai lithium, SOH, mode otomotif, mode penyimpan, tenaga surya

Multiple Switching Patterns for SHEPWM Inverters Using Differential Evolution Algorithms

International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 1, No 2: December 2011
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Original Source | Check in Google Scholar | Full PDF (503.857 KB)

Abstract

An investigation on multiple patterns for both odd and even number of switching angles in a three-phase selective harmonic elimination pulse width modulation (SHEPWM) inverter is presented. The switching patterns are examined and classified on the basis of the harmonic performance of the waveforms output from the inverter. Differential evolution algorithms are employed to calculate the optimum switching angles. Selected cases are verified experimentally by a digital signal processor-based hardware implementation. The experimental results show that all types of the patterns offer low harmonic distortions on the inverter output after filtering.  However, one type gives better harmonic performance is identified.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.101

Differential Evolution Algorithm with Triangular Adaptive Control Parameter for SHEPWM Switching Pattern Optimization

International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 3: September 2017
Publisher : Institute of Advanced Engineering and Science

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Abstract

Differential evolution (DE) algorithm has been applied as a powerful tool to find optimum switching angles for selective harmonic elimination pulse width modulation (SHEPWM) inverters. However, the DE’s performace is very dependent on its control parameters. Conventional DE generally uses either trial and error mechanism or tuning technique to determine appropriate values of the control paramaters. The disadvantage of this process is that it is very time comsuming. In this paper, an adaptive control parameter is proposed in order to speed up the DE algorithm in optimizing SHEPWM switching angles precisely. The proposed adaptive control parameter is proven to enhance the convergence process of the DE algorithm without requiring initial guesses. The results for both negative and positive modulation index (M) also indicate that the proposed adaptive DE is superior to the conventional DE in generating SHEPWM switching patterns

Battery Control Strategy for Hybrid Power Generation Systems

International Journal of Electrical and Computer Engineering (IJECE) Vol 2, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Original Source | Check in Google Scholar | Full PDF (434.272 KB)

Abstract

Standalone diesel generators (DGs) are widely utilized in remote areas in Indonesia. Some areas use microhydro (MH) systems with DGs backup.  However, highly diesel fuel price makes such systems become uneconomical. This paper introduces hybrid photovoltaic (PV)/MH/ DG/battery systems with a variable charging strategy method to minimize the diesel fuel consumption. The method is applied to control the state of charge (SOC) level of the battery based on its previous level and the demand load condition to optimize the DG operation. The optimal operation shows that the hybrid PV/MH/DG/battery with the variable charging strategy needs less fuel consumption than PV/MH/DG and MH/DG systems.DOI:http://dx.doi.org/10.11591/ijece.v2i4.556 

Optimum Renewable Fraction for Grid-connected Photovoltaic in Office Building Energy Systems in Indonesia

International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 4: December 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper analyzes influences of renewable fraction on grid-connected photovoltaic (PV) for office building energy systems. The fraction of renewable energy has important contributions on sizing the grid-connected PV systems and selling and buying electricity, and hence reducing net present cost (NPC) and carbon dioxide (CO2) emission. An optimum result with the lowest total NPC for serving an office building is achieved by employing the renewable fraction of 58%, in which 58% of electricity is supplied from the PV and the remaining 42% of electricity is purchased from the grid. The results have shown that the optimum grid-connected PV system with an appropriate renewable fraction value could greatly reduce the total NPC and CO2 emission.