Articles
<![CDATA[REDUCTION OF CURRENT HARMONIC CAUSED BY AC-DC RECTIFICATION WITH HYBRID FILTER FOR ENERGY SAVING LAMP ELECTRONIC BALLAST ]]>
<![CDATA[Handajadi, Wiwik]]>;
<![CDATA[Wijaya, F. Danang]]>;
<![CDATA[Sarjiya, Sarjiya]]>
<![CDATA[ Jurnal Teknologi Vol 6 No 2 (2013): Jurnal Teknologi ]]>
Publisher : <![CDATA[Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta ]]>
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<![CDATA[Penggunaan LHE (Lampu Hemat Energi) yang menggunakan ballast elektronik akan menimbulkan harmonik, baik harmonik arus maupun tegangan dan adanya harmonik akan berakibat kualitas daya listrik menjadi buruk. Disisi lain LHE yang menggunakan ballast elektronik mempunyai sifat- sifat yang baik dalam mengkonversikanenergi listrik menjadi cahaya, karena mempunyai efisiensi diatas 80%. Riset ini melakukan kegiatan yang bertujuan menganalisis kualitas daya listrik pada jaringan distribusi akibat beban LHE dengan ballast elektronik. Selanjutnya dilakukan pengukuran dengan skala laboratorium dan dilanjutkan analisis dengan menggunakan program, untuk itu dianalisis permasalahan yang meliputi: penggunaan ballast elektronik akan menimbulkan harmonik arus maupun tegangan, harmonik yang berpengaruh harmonik ganjil dan harmonik ke-3 paling dominan, harmonik akan berpengaruh pada kualitas daya listrik.Dengan demikian akan ditindak lanjuti upaya untuk memperkecil adanya harmonik khususnya harmonik arus dan selanjutnya dianalisis pengaruh harmonik untuk kapasitas kelompok beban dengan LHE berkapasitas besar pada jaringan distribusi. Untuk penghematan penggunaan energi listrik, khususnya kebutuhan penerangan harus diupayakan adanya konversi energi listrik yang optimal dan efisien, maka dapat digunakan LHE yang menggunakan ballast elektronik dan ditambahkan filter hybrid dapat mengurangi efek negatif yaitu adanya harmonik, sehingga dapat diperoleh kondisi yang efisien pada beban dan optimal pada jaringan distribusi. Dalam penelitian ini dilakukan simulasi dengan program PSIM versi 9.0 dan menggunakan acuan, untuk meminimalkan adanya harmonik arus pada LHE dengan ballast elektronik agar dapat meningkatkan kualitas daya listrik. Dari hasil penelitian ini dapat diperoleh pengurangan besarnya harmonik arus sebesar 10 % akibat penyearahan AC- DC, akibat penggunaan ballast elektronik. Selain itu juga dapat diperoleh cara mengurangi adanya harmonik dengan menggunakan filter hybrid tersebut agar LHE memenuhi standar IEC 61000-3-2. Class C.]]>
<![CDATA[ANALISIS AHBC (ASYMMETRIC HALF BRIDGE CONVERTER) PADA SRM (SWITCHED RELUCTANCE MOTOR) 3 FASA MENGGUNAKAN PSIM ]]>
<![CDATA[Jumardi, Jumardi]]>;
<![CDATA[Wijaya, Danang]]>;
<![CDATA[Firmansyah, Eka]]>
<![CDATA[ Jurnal Teknologi Vol 7 No 2 (2014): Jurnal Teknologi ]]>
Publisher : <![CDATA[Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta ]]>
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<![CDATA[AHBC (asymmetric half bridge converter) adalah catu daya yang diperlukan untuk menggerakkan motor SRM (switched reluctance motor). Sebelum membuat peranti catu daya yang sesungguhnya, perlu dilakukan pemodelan untuk mengetahui perilakunya dan memahami interaksi antara konverter tersebut dengan motor. Dalam penelitian ini, AHBC dimodelkan dengan software PSIM untuk diketahui kinerjanya. Variabel yang diamati adalah sudut on dan sudut pulsa. Sudut on adalah sudut untuk menghasilkan putaran maju, besarnya 900. Sudut pulsa adalah sudut untuk menghasilkan putaran dan torsi yang dinginkan, besarnya 00 – 1200. Sudut on dan sudut pulsa dimasukkan ke rangkaian controller untuk menghidupkan dan mematikan rangkaian AHBC yang mensuplai tegangan sumber menuju kumparan stator. Sudut pulsa sama (sudut pulsa1 = sudut pulsa2) menghasilkan putaran, torsi minimal, tegangan, induktansi dan fluks gandeng yang lebih besar daripada sudut pulsa berbeda (sudut pulsa1 sudut pulsa2). Sudut pulsa berbeda menghasilkan arus motor dan rugi-rugi semikonduktor yang lebih besar daripada sudut pulsa sama. Sudut pulsa sama menghasilkan torsi maksimal yang hampir sama dengan sudut pulsa berbeda (1,213 Nm dan 1,216 Nm).]]>
<![CDATA[Quasi-flat linear PM generator optimization using simulated annealing algorithm for WEC in Indonesia ]]>
<![CDATA[Azhari, Budi]]>;
<![CDATA[Wijaya, Fransisco Danang]]>
<![CDATA[ Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 10, No 1 (2019) ]]>
Publisher : <![CDATA[Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences ]]>
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DOI: 10.14203/j.mev.2019.v10.29-35
<![CDATA[Linear permanent magnet generator (LPMG) is an essential component in recent wave energy converter (WEC) which exploits wave’s heave motion. It could be classified into tubular-type, flat-tricore type, and quasi-flat type. In previous researches, these three models have been studied and designed for pico-scale WEC. Design optimization has further been conducted for flat-tricore LPMG, by using simulated annealing (SA) algorithm. It modified some parameters to minimize the resulted copper loss. This paper aims to optimize a quasi-flat LPMG design by applying SA algorithm. The algorithm would readjust the initial LPMG parts dimension. Then, the output of the optimized design would be analyzed and compared. The results showed that the optimization could reduce the copper loss by up to 73.64 % and increase the efficiency from 83.2 % to 95.57 %. For various load resistances, the optimized design also produces larger efficiency. However, the optimized design has a larger size and produces larger cogging force than the initial design.]]>
<![CDATA[Optimum Permanent Magnets Configuration in Flat-Quasi Linear Permanent Magnet Generators ]]>
<![CDATA[Fransisco Danang Wijaya]]>;
<![CDATA[Budi Azhari]]>;
<![CDATA[Harnoko Stephanus]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 6, No 6: December 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v6i6.pp2589-2602
<![CDATA[Flat-quasi type of linear permanent magnet generators (LPMGs) have been considered to be applied for several applications, such for wave energy conversion and free piston combustion engine. One of the important issues concerning LPMG is the permanent magnets configuration, due to its effects to the generator’s excitation performance. In this paper, a 1 kW flat-quasi LPMG would be designed and built. During the process, optimum permanent magnets configuration was required and researched. The optimum configuration considered the output power and resulted cogging force. Invetigation was then conducted by modifying several variables, including poles’ arrangement, pole length, number of pole, and pole skewing angle. The modification constraints were total permanent magnets’ volume and generator dimension. The results showed that permanent magnet configuration with halbach arrangement, pole length equals 55% of the slot pitch length, and 61.19o skewing angle produced the optimum output values.]]>
<![CDATA[Impedance Matching Method in Two-Stage Converters for Single Phase PV-Grid System ]]>
<![CDATA[L. Heru Pratomo]]>;
<![CDATA[F. Danang Wijaya]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 5, No 4: August 2015 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v5i4.pp626-635
<![CDATA[This paper presents the study on the impedance matching method in two-stage converters for single phase PV-grid system. The use of PV systems was to obtain the electrical power from the sunlight energy. The system consisted of a Buck-Boost DC-DC converter and a five-level inverter. A Buck-Boost DC-DC converter was used as a means of impedance matching to obtain the maximum power that, in this case, through a method by using the incremental conductance current control algorithm. Meanwhile a five-level inverter was used as an interface to the utilities. By using this technique, the system came to be simple. The impedance of the power grid, a Buck-Boost DC-DC converter, and a five-level inverter were seen by PV mostly in the area of RMPP, enabling the maximum power produced by the PV to be delivered to the grid. To demonstrate the effectiveness of the design, the analysis and simulation results, furthermore, were provided]]>
<![CDATA[Maximum Power Point Tracking using Particle Swarm Optimization Algorithm for Hybrid Wind-Tidal Harvesting System on the South Coast of Java ]]>
<![CDATA[Fransisco Danang Wijaya]]>;
<![CDATA[Kukuh Daud Pribadi]]>;
<![CDATA[Sarjiya Sarjiya]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 7, No 2: April 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v7i2.pp659-666
<![CDATA[This paper proposes a hybrid wind-tidal harvesting system (HWTHS). To extract maximum power from the wind and tidal, HWTHS implements particle swarm optimization (PSO) algorithm in maximum power point tracking (MPPT) method. The proposed HWTHS had been tested on the range of possible input appropriate to the characteristics of the southern coast of Java. The presented result shows that by using PSO-based MPPT algorithm, maximum power point can be achieved. Thus the efficiency of HWTHS is 92 %, 94 % in wind section and 91 % in tidal section. By using PSO-based MPPT, HWTHS can respond well to changes in wind and tidal speed, whether it's a change from low speed to a higher speed or change from high speed to lower speed wherein time to reach new steady state is ± 0.1 s. At varied wind and tidal speed, PSO algorithm can maintain Cp of the system in the range of 0.47 - 0.48 so that power can be extracted to the maximum.]]>
<![CDATA[Optimizing Tri-Core Permanent-Magnet-Linear-Generator Direct-Drive Wave-Energy-Conversion System Design for Sea Wave Characteristics in South Coast Yogyakarta ]]>
<![CDATA[Fransisco Danang Wijaya]]>;
<![CDATA[Sarjiya Sarjiya]]>;
<![CDATA[Muhammad Rifa'i Putra Sugita]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 7, No 2: April 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v7i2.pp610-618
<![CDATA[According to statistical data, the south coast Yogyakarta has significant ocean wave height which can be used to generate electricity by using wave-energy-converter system. One of the simplest way to convert wave energy to electricity is using direct-drive wave-energy-conversion (WEC) system with permanent-magnet-linear-generator (PMLG). This method is simple because it doesn’t need to convert linear motion to rotational motion. However, PMLG has large electric power losses, has great weight in both of the stator and rotor, and expensive to make. In this paper, a tri-core PMLG was designed. The electric power losses in the winding, translator weight, and manufacturing cost were ideally minimized using multiobjective optimization combined with simulated annealing (SA) algorithm. Then, the design was verified using finite element analysis. The optimized design of this PMLG was simulated using sinusoidal ocean waves which usually occur in the south coast of Yogyakarta to analyze the performance of this linear generator. Simulation result has been shown that this generator can generate 911 watt peak output power at the rated condition and at the optimum load with 81.14% efficiency. This confirms that the optimized design of PMLG is suitable for direct-drive WEC with low power losses and manufacturing cost.]]>
<![CDATA[Voltage Control of Single-Phase Two Winding Self Excited Induction Generator Using SVC-MERS for Isolated System ]]>
<![CDATA[Fransisco Danang Wijaya]]>;
<![CDATA[Hartanto Prabowo]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 7, No 3: September 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v7.i3.pp901-907
<![CDATA[Single-phase induction generator is very suitable to be used in the typical loads which only need a single-phase power supply with small power capacity requirement, such as diesel engine, picohydro or small wind plant. It has some advantages such as rugged, effective cost, maintenance free and require no external excitation. However, it has inductive characteristic which makes poor voltage regulation. This paper proposed a shunt reactive compensator called SVC-MERS which can provide a variable reactive power to maintain the generator voltage despite of load variations. The experiment was conducted on single-phase two winding induction generator coupled by a three-phase induction motor which serves as the prime mover. SVC-MERS and the load are connected in shunt to the main winding, while the excitation capacitor was connected to the auxiliary winding. The experimental results showed that SVC-MERS can improve voltage regulation and substantially enhanced steady state loading limit.]]>
<![CDATA[Design of Full-bridge DC-DC Converter 311/100 V 1kW with PSPWM Method to Get ZVS Condition ]]>
<![CDATA[Toni Prasetya]]>;
<![CDATA[F. Danang Wijaya]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 1: March 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v8.i1.pp59-68
<![CDATA[Enhancing the switching frequency can increase the power density of a fullbridge dc-dc converter. However, power loss in switches will increase due to the intersection of voltage and current during turn-on and turn-off transition process. The switching power loss can be reduced by making the condition of zero voltage switching (ZVS) which in this study is obtained by using the phase-shifted PWM method. Achieving this condition requires appropriate parameters such as deadtime, leakage inductance, and the primary current of transformer in sufficient value. In this study, ZVS is achieved when the transformer leakage inductance of 14.12 μH is added with external inductance of 24.29 μH which is installed in series with transformer and when the primary current of transformer is more than 1.289 A.]]>
<![CDATA[A Simple Strategy of Controlling a Balanced Voltage Capacitor in Single Phase Five-Level Inverter ]]>
<![CDATA[Leonardus Heru Pratomo]]>;
<![CDATA[F. Danang Wijaya]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 1: March 2015 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v6.i1.pp160-167
<![CDATA[The five-level inverter has been used for many applications in renewable energy systems. Even though its harmonic distortion was lower than the conventional two-level inverter. The five-level converter has some disadvantages such as increasing power semiconductor, complex pulse width modulation control methods, and problem with the voltage balancing of the capacitor. This paper aims to propose a modified five-level inverter based on sinusoidal pulse width modulation using phase shifted carrier to enhancing the capacitor voltage balancing. This modified five-level inverter reduces the overall cost and the complexity of the pulse width modulator. Thus making the proposed control system highly simple. The performance and its controller were validated by means of standard laboratory equipments. The analysis, simulation and implementation result showed better performance of five-level inverter.]]>
