Articles
<![CDATA[Simulation of Control Cascaded Boost Converter Series Connected and Applied in Electric Motor as Prime Mover of Irrigation Water Pump ]]>
<![CDATA[Soedibyo, Soedibyo]]>;
<![CDATA[Ashari, Mochamad]]>
<![CDATA[ JAVA Journal of Electrical and Electronics Engineering Vol 14, No 1 (2016) ]]>
Publisher : <![CDATA[JAVA Journal of Electrical and Electronics Engineering ]]>
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<![CDATA[Abstract— The purpose of this paper is to achieve the system design that can supply energy from solar PV to the water pump irrigation motor. This research focused on design system of boost converter cascade series connected. Battery charging process and load supply is taken in the same time when the sun irradiation still exist. Power plant supply the power to the motor load with the capacity 2 HP, 90% efficiency, 380 Volt 3-phase. Inverter power rating is 1,750 Watt with the input voltage is 650 Volt-dc. Terminal voltage of inverter is 380 Volt-ac, 3-phase. Pump operate within ten hours during daylight and fourteen hours during day night. Terminal voltage from the first converter is about 114 Vdc and the second converter is about 650 Vdc. Batteries used is 3 x 12 V in series connected with the capacity of 40 Ah for each battery. Output power that produced from PV is controlled by first stage boost converter that has function to supply the power to the boost converter_2 circuit to achieve the Maximum Power Point (MPP). Controller is used for rising the efficiency of MPP. From the output boost converter_2 terminal, it’s connected to inverter that convert output DC voltage from the boost converter_2 to AC voltage 380 V, 3-phase and 50 Hz. Design of system model is simulated in MATLAB software. The result of simulation shows the scheme proposed could supply the power to energize the motor of water pump within 24 hours.]]>
<![CDATA[Modelling Back-to-Back Converter with Average Model in Wind Power System Using DFIG ]]>
<![CDATA[Harumwidiah, Anisa]]>;
<![CDATA[Ashari, Mochamad]]>;
<![CDATA[Riawan, Dedet Candra]]>
<![CDATA[ IPTEK Journal of Proceedings Series Vol 1, No 1 (2014): International Seminar on Applied Technology, Science, and Arts (APTECS) 2013 ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j23546026.y2014i1.212
<![CDATA[The total energy consumption in this year increase significantly. Most of energy that used come from fossil fuel. The use of fossil fuel can cause a lot of pollution and the amount of them is decreased. Therefore, many countries developing renewable energy system. One of renewable energy system is wind power using Doubly Fed Induction Generator (DFIG). DFIG supplies AC current from the stator winding that are connected directly to the grid and rotor winding DFIG are also connected to the grid through power electronic converter. The type of this converter is back-to-back converter. In general, this converter used switching model. However, this model produce a slow simulation and high riplle. To solve this problem DFIG with average model in back-to-back converter is studied in this research. This design operated by controlling the rotor speed DFIG to produce maximum power and preserve the value of DC link voltage remains constant.]]>
<![CDATA[Control Design For Shunt Active Power Filter Based On p-q Theory In Photovoltaic Grid-Connected System ]]>
<![CDATA[Moh. Jauhari]]>;
<![CDATA[Dedet Candra Riawan]]>;
<![CDATA[Mochamad Ashari]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 3: September 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v9.i3.pp1064-1071
<![CDATA[This paper presents the control for Shunt Active Power (SAPF) filter in photovoltaic (PV) systems connected to the grid. The proposed configuration of the system consists of a photovoltaic array that connected to the grid through the three-phase inverter topology that also serves as an active filter. Photovoltaic is coupled in parallel with the direct curret (DC) side of the active filter. With this configuration, can be obtained three advantages, namely the elimination of harmonic currents caused by nonlinear load, reactive power injection, and injection of active power generated photovoltaic. The p-q Theory is used to calculate the harmonic reference current to be used to control the active filter coupled fotovoltaic in generating anti-harmonic currents. The results show that system can reduce harmonic distortion from THD 27.22% to be THD 1.05%, whereas when the active power from photovoltaic injected, the THD become 2.01%. Power sharing can also be seen from this study.]]>
<![CDATA[High Performance Maximum Power Point Tracking on Wind Energy Conversion System ]]>
<![CDATA[Dwiana Hendrawati]]>;
<![CDATA[Adi Soeprijanto]]>;
<![CDATA[Mochamad Ashari]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 3: September 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v8.i3.pp1359-1367
<![CDATA[This paper presents the maximum power point tracking (MPPT) to extract the power of wind energy conversion system (WECS) using the Firefly Algorithm (FA) algorithm. This paper aims to present the FA as one of the accurate algorithms in MPPT techniques. Recently, researchers tend to apply the MPPT digital technique with the P n O algorithm to track MPP. On the other hand, this Paper implements the FA included in the digital classification to improve the performance of the MPPT technique. Therefore, the FA tracking results are verified with P n O to show the accuracy of the MPPT algorithm. The results obtained show that performance is higher when using the FA algorithm]]>
<![CDATA[Maximum Output Power Tracking of Wind Turbine Using Intelligent Control ]]>
<![CDATA[Muldi Yuhendri]]>;
<![CDATA[Mochamad Ashari]]>;
<![CDATA[Mauridhi Hery Purnomo]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 2: August 2011 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v9i2.690
<![CDATA[ The Output power of wind turbine is determined by wind speed. The Output power can be adjusted by controlling the generator speed and pitch angle of wind turbine. When the wind speed below the wind turbine rated, the output power of generator can be maximized by controlling the generator speed at point of maximum power coefficient. When the wind speed above the wind turbine rated, output power of wind turbine will exceed the power generators rated. In this condition, the output power of wind turbine needs to be regulated to conform to the generator power rate. Output power of wind turbine can be regulated by adjusting the pitch angle of wind turbine. In this paper is developed the control strategies based intelligent control for controlling the generator speed and pitch angle of wind turbine, so the maximum output power tracking (MOPT) of wind turbine can be obtained at any wind speed variations. Generator speed is controlled using PI Fuzzy Logic Controller (PI-FLC) based Direct Field Oriented Control (DFOC). Pitch angle of wind turbine is controlled using Elman Recurrent Neural Network (RENN). The simulation results with Matlab Simulink shows that the both controller was successfully regulates the output power when the wind speed above the wind turbine rated and the output power can be maximum when the wind speed below the wind turbine rated. ]]>
<![CDATA[Optimal Design of Fuel-cell, Wind and Micro-hydro Hybrid System using Genetic Algorithm ]]>
<![CDATA[Soedibyo Soedibyo]]>;
<![CDATA[Heri Suryoatmojo]]>;
<![CDATA[Imam Robandi]]>;
<![CDATA[Mochamad Ashari]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 10, No 4: December 2012 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v10i4.858
<![CDATA[The target of stand-alone hybrid power generation system was to supply the load demand with high reliability and economically as possible. An intelligent optimization technique using Genetic Algorithm is required to design the system.This study utilized Genetic Algorithm method to determine the optimal capacities of hydrogen, wind turbines and micro-hydro unit according to the minimum cost objective functions.The minimum cost valutes to these two factors. In this study, the cost objective function included the annual capital cost, annual operation maintenance cost, annual replacement cost and annual customer damage cost. The proposed method will be used to optimize the hybrid power generation system located in Leuwijawa village in Central Java of Indonesia. Simulation results showed that the optimum configuration can be achieved using 19.85 ton of hydrogen tanks, 21x100 kW wind turbines and 610 kW of micro-hydro unit respectively]]>
<![CDATA[IMPROVED VOLTAGE OF CASCADED INVERTERS USING SINE QUANTIZATION PROGRESSION ]]>
<![CDATA[Bambang Sujanarko]]>;
<![CDATA[Mochamad Ashari]]>;
<![CDATA[Mauridhi Hery Purnomo]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 8, No 2: August 2010 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v8i2.613
<![CDATA[The previous methods of cascaded multilevel inverter (CMLI) can improve power quality but the methods have low voltage output if the DC voltages limited by the voltage rating of power semiconductor. To improve the amplitude of CMLI output voltage, this paper proposes a new DC voltage progression. The progression based on sine quantization method (SQM), which determines a sequence of DC voltages from discrete amplitudes of sine wave function. The method also collaborates with step equal residual area method (SERAM) to minimized total harmonics distortions (THD). A single-phase CMLI that consist four H-Bridges simulated and implemented to verify the methods. Amplitude output voltage and THD results of simulations and experiments indicate that the sine quantization progression produce the highest output voltage than other DC voltage progressions, with power quality or THD in the accepted region. The amplitude of output voltage have linier function with amplitude equal 0.6665 times of H-Bridges numbers and have exponential function of THD with value below 5%.]]>
<![CDATA[KOMBINASI FEED BACK DAN FEED FORWARD KONTROLLER PI SEBAGAI KENDALI DYNAMIC VOLTAGE RESTORER (DVR) UNTUK MEMULIHKAN VOLTAGE SAG DAN INTERRUPTION ]]>
<![CDATA[Dimas Anton A]]>;
<![CDATA[Imron Rosyadi]]>;
<![CDATA[Mochamad Ashari]]>;
<![CDATA[Heri Suryoatmojo]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 7, No 2: August 2009 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v7i2.581
<![CDATA[Dynamic voltage restorer (DVR) is one of equipments to protect sensitive load from voltage drop. DVR is installed series with line feeder by serial transformer which injecting voltage when under voltage occurs. This research is investigate the capability of DVR, which controlled by combination of feed back and feed forward PI, to handle voltage sag and interruption. DVR controls have been designed and implemented in DVR prototype. As a result, in simulation, DVR can maintain voltage in range 90% - 105% nominal voltage. Voltage at load side can be restored to 1 pu and 0.79 pu when voltage sag and interruption respectively. Furthermore, DVR prototype can restore 0.95 pu when voltage sag and 0.54 pu when interruption.]]>
<![CDATA[Reconfiguration of Distribution Network with Distributed Energy Resources Integration Using PSO Algorithm ]]>
<![CDATA[Ramadoni Syahputra]]>;
<![CDATA[Imam Robandi]]>;
<![CDATA[Mochamad Ashari]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 3: September 2015 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v13i3.1790
<![CDATA[This paper presents optimal reconfiguration of radial distribution network with integration of distributed energy resources (DER) using improved particle swarm optimization (PSO) algorithm. The benefits of DER integration in distribution system are reducing power losses, improving voltage profiles and load factors, eliminating system upgrades, and reducing environmental impacts. However, the presence of DER could also cause technical problems in voltage quality and system protection. Reconfiguration of distribution network is aimed to minimize power loss and to improve voltage quality in order to enhance the distribution system performance. In this study, reconfiguration method is based on an improved PSO. The method has been tested in a 60-bus Bantul distribution network of Yogyakarta Special Region province, Indonesia. The simulation results show the importance of reconfiguring the network for enhancing the distribution system performance in the presence of DER.]]>
<![CDATA[Kendali Dynamic Voltage Restorer Menggunakan Jaring Saraf Tiruan Counterpropagation ]]>
<![CDATA[Glanny M.Christiaan Mangindaan]]>;
<![CDATA[Mochamad Ashari]]>;
<![CDATA[Mauridhi Hery Purnomo]]>
<![CDATA[ Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2008 ]]>
Publisher : <![CDATA[Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia ]]>
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<![CDATA[Desain algoritma untuk pengendalian dynamic voltage restorer (DVR) sehingga menghasilkan tanggapan yangcepat dan tepat dibahas dalam makalah ini. Dynamic voltage restrorer digunakan untuk memperbaiki kualitastegangan akibat tegangan kedip yang dapat mengganggu kinerja dari peralatan peralatan yang kritis atau peka.Performansi DVR ditunjukkan saat terjadi gangguan berupa tegangan kedip yang diakibatkan oleh satu ataubeberapa gangguan pada sistem tenaga listrik. Gangguan yang terjadi dapat berbentuk simetris atau asimetrisPengendali yang diusulkan adalah jaring saraf tiruan dengan metode counterpropagation karena denganmetode ini dapat melakukan proses iterasi, pelatihan dan respon lebih cepat. Proses simulasi menggunakanperangkat lunak MATLAB dengan sistem tenaga listrik tegangan rendah.Keywords: Dynamic voltage restorer (DVR), tegangan kedip, counterpropagation, jaring saraf tiruan.]]>
