Dedet Candra Riawan

Optimization of photovoltaic farm under partial shading effects using artificial intelligent based matrix switch controller

Partial shading on photovoltaic array due to weather conditions reduces the energy generated and worsening the entire photovoltaic farm efficiency. The purpose of this research was to electric physically reconfigurate PV string through switch matrix by control of smart controller. It is great to find current and voltage at TCT point approaching work of range from MPPT, despite being awarded shading effect. The research method was reflected on the algorithms design. The aim of algorithms was to clustering in two steps. The first step was clustering one or more photovoltaic string based on parallelly current. Result of first clustering continued of second step clustering, clustering the first step result in series. The algorithm work smartly by current input from current sensors. Input processing from sensor by smart controller was signal control which for switch on/off the switches function in switch matrix circuit. Switch matrix output will be forwarded to MPPT circuit. This mechanism being novelty of this research. Based on the testing, its mechanism able to protect the current at 18A level for all cases with each case voltage consecutively 3060V, 1360V, 2040V and 1020 V. By this mechanism, can be optimality power system increased up to 9.S % .similarly be affected or not partial shading effect.

Performance Characteristics of Miniature Photovoltaic Farm Under Dynamic Partial Shading

Received Dec 04, 2017 Revised Jan 11, 2018 Accepted Apr 15, 2018 Wireless Body Area Networks (WBANs) are fundamental technology in health care that permits the information of a patient’s essential body parameters to be gathered by the sensors. However, the safety and concealment defense of the gathered information is a key uncertain problem. A Hybrid Key Management (HKM) scheme [13] is worked based on Public Key Cryptography (PKC)-authentication scheme. This scheme uses a oneway hash function to construct a Merkle Tree. The PKC method increase the computational complexity and lacking scalability. Additionally, it increases expensive computation, communication costs and delay. To overcome this problem, Robust Security for Protected Health Information by ECC with signature Hash Function in WBAN (RSP) is proposed. The system employs hash-chain based key signature technique to achieve efficient, secure transmission from sensor to user in WBAN. Moreover, Elliptical Curve Cryptography algorithm is used to verifies the authenticate sensor. In addition, it describes the experimental results of the proposed system demonstrate the efficient data communication in a network.A Weblogs contains the history of User Navigation Pattern while user accessing the websites. The user navigation pattern can be analyzed based on the previous user navigation that is stored in weblog. The weblog comprises of various entries like IP address, status code and number of bytes transferred, categories and time stamp. The user interest can be classified based on categories and attributes and it is helpful in identifying user behavior. The aim of the research is to identifying the interested user behavior and not interested user behavior based on classification. The process of identifying user interest, it consists of Modified Span Algorithm and Personalization Algorithm based on the classification algorithm user prediction can be analyzed. The research work explores to analyze user prediction behavior based on user personalization that is captured from weblogs.Wireless Body Area Networks (WBANs) are fundamental technology in health care that permits the information of a patient’s essential body parameters to be gathered by the sensors. However, the safety and concealment defense of the gathered information is a key uncertain problem. A Hybrid Key Management (HKM) scheme [13] is worked based on Public Key Cryptography (PKC)-authentication scheme. This scheme uses a oneway hash function to construct a Merkle Tree. The PKC method increase the computational complexity and lacking scalability. Additionally, it increases expensive computation, communication costs and delay. To overcome this problem, Robust Security for Protected Health Information by ECC with signature Hash Function in WBAN (RSP) is proposed. The system employs hash-chain based key signature technique to achieve efficient, secure transmission from sensor to user in WBAN. Moreover, Elliptical Curve Cryptography algorithm is used to verifies the authenticate sensor. In addition, it describes the experimental results of the proposed system demonstrate the efficient data communication in a network.

Core-cutting topology effects of single phase 1-KVA transformer on inrush current

This paper deals with core-cutting method effects of single phase 1-KVA transformer on its inrush current. Different core-cutting topologies of transformer which is EI and EE were studied. Finite-element method and equivalent circuit based simulation were done to understand its effect on inrush current of transformer. Equivalent circuit is used to obtain the peak value of inrush current. Meanwhile finite-element method simulation is used to understand the distribution of flux density and magnetic field intensity. The results show that inrush current value influenced by core losses. Moreover, it is shown that EI cutting topology gives lower peak value of inrush current.

Particle swarm optimization-based BLDC motor speed controller with response speed consideration

In this paper, a Particle Swarm optimization (PSO) based controller is implemented to a BLDC motor. A PSO-based controller is designed for controlling BLDC motor speed with acceleration consideration. PSO is used to find the appropriate PI controller parameters, Kp and Ki according to the speed reference and response speed designed. The result shows that the PSO-based controller designed is able to control the speed of BLDC motor properly with the desired response speed.

Design of electronic speed controller for BLDC motor based on single ended primary inductance converter (SEPIC)

Brushless DC (BLDC) motors have been applied extensively in household and industrial scale because of the advantages such as high efficiency and low mechanical losses because it does not use a brush such as DC motors. Application of the BLDC motors use rectified AC source to minimize battery usage. However, the use of BLDC motors and rectifying circuit causing poor power factor and facing harmonic problems. At rated power, BLDC motors have power factor about 0.58 while the current THD at 73%. These values are outside the permitted tolerance limits. This study aims to improve power factor and THD value of current caused by the operation of brushless DC motors using a SEPIC converter. Moreover, the purpose of this study is that the motor is able to operate at different levels of speed and various loads. The results of the simulation of the design have been made, the motors can respond to variations in the speed reference given to the good. The control circuit is also able to make the motor maintain pace with changes in the load every time. Power factor observed at source will rise until 0.99 at various speeds. In addition, the current THD has an average value of 2% at various speeds. Both of these parameters are within the tolerances allowed by the standard.

Desain dan Implementasi Z-Source Inverter 3 Fasa dengan Metode Simple Boost Control untuk Suplai Motor Induksi

Aplikasi dari energi terbarukan semakin banyak dikembangkan terutama penelitian mengenai photovoltaic dan fuel cell. Namun, kendala utama pada photovoltaic dan fuel cell yaitu memiliki tegangan keluaran yang rendah sehingga diperlukan sebuah konverter peningkat tegangan sebelum dapat diaplikasikan untuk inverter. Penggunaan inverter dengan penambahan topologi peningkat tegangan menyebabkan rugi – rugi konverter semakin besar. Selain itu, kendala utama pada topologi voltage source inverter yaitu tidak dapat beroperasi sebagai buck-boost konverter, diperlukannya dead time pada kontrol gate, dan kondisi shoot through zero state akan menyebabkan kerusakan pada inverter. Oleh karena itu, diperlukan desain topologi inverter yang memiliki kemampuan konversi boost dan tahan terhadap kondisi shoot through zero state. Z-Source inverter merupakan pengembangan dari voltage source inverter dengan penambahan rangkaian sumber impedansi dan kontrol penyalaan menggunakan simple boost control. Efisiensi Z-Source inverter dapat mencapai 88%. Faktor peningkatan tegangan dapat mencapai 2.4 kali dengan menggunakan shoot through duty ratio sebesar 16%. Z-Source inverter mampu mengontrol kecepatan motor induksi berdasarkan v/f konstan dengan cara merubah nilai shoot through duty ratio dan frekuensi fundamental. Jadi inverter ini sangat cocok untuk diaplikasikan sebagai topologi dengan kemampuan meningkatkan tegangan input dan digunakan sebagai kontrol kecepatan motor induksi.

PV farm placement and sizing using GA for area development plan of distribution network

Electricity network with the concept of Distributed Generation (DG) is growing rapidly. The rapid development is caused by factors such as environmental issues, the restructuring of the electricity market, and the development of small-scale power plant technology. This paper proposes a method of determining the location and capacity of Distributed Generation Photovoltaic (PV-DG) in PV farm system using Genetic Algorithms (GA). And also to calculate power generation and active/reactive power losses. The method proposed is intended to improve voltage stability and power losses in the distribution network. The proposed method is tested on a standard distribution system IEEE 30 bus with three units of DG. Optimization results showed 12.81% reduction in power losses and bus voltage between 1.05 to 0.96 pu.

Experimental design boost ratio converter with hybrid transformer for hybrid power source charging station

In this paper, we propose design of the boost converter with hybrid transformer ratio for hybrid power source charging station. This converter is addressed to voltage controller and maximum power point tracker (MPPT) of photovoltaic (PV) system. In order to get high voltage boost ratio, this converter utilizes a hybrid operation mode, which is a combination of a pulse width modulation (PWM) and resonant modes. This converter requires only a single switch so much easier in the controlling. Voltage stress on the switch and the diode is relatively low and is not affected by changes in the input voltage when the output voltage is kept in constant value. The experiment results show that the proposed converter can work on a wide range input voltage and has a high efficiency at all load levels is equal to ± 78% So this converter can be applied into an alternative energy sources that produce low voltage DC such as photovoltaic system in charging station.