The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Harmonic distortion is one of power quality problems in power system which it could affect equipment malfunction and many other problems. Therefore harmonic distortion load identification becomes important concern in the power system. In this paper, proposes a Radial Basis Function (RBF) Neural Network to identification of harmonic load. A low cost microcontroller gathers harmonic load data with Fast...
The IEC standard or the International Electrotechnical Commission is a mathematical standard in modeling inverse curve characteristic of overcurrent relay or OCR. Using the IEC standard allows for inaccurate coordination of the relay such as the intersection of the inverse curve, because this standard does not always correspond to various problems in the industry. Accordingly, in this research paper...
Nowadays, many solar photovoltaics (PV) are installed in the power grid. Maximum power point tracking (MPPT) method is used to maximize the power in solar PV. However, the power maximum in PV can cause overvoltage in the power grid. Therefore, this paper discusses a modified Incremental conductance (IC) MPPT algorithm for constant power generation (CPG) under fluctuated solar irradiation. This method...
High impedance faults are not easy to be measured and detected by convetional relay protection. This paper proposed simualtions studies for detection high impedance fault in extra high voltage transmission line (EVT). The fault simulations based on simplified 2 diodes model. Current signal from the measurement is processed using discrete wavelet transform type haar wavelet to obtain coefficient detail...
Photovoltaic (PV) Module is becoming important source as renewable energy due to low maintenance requirements and environmental friendliness. PV module has low efficiency. Hence, The Maximization of PV module become an essential concern. Maximum power point tracking (MPPT) methods required to obtain maximum power point (MPP) of PV module. In this paper, proposes modified firefly algorithm to track...
The characteristic curve of over current relay (OCR) has a very important role in the electrical protection devices. Standard characteristic curve such as Normal Inverse (NI), Extremely Inverse (EI), Very Inverse (VI) and Longtime Inverse (LTI) are often changed at the time of implementation, carried out for the purposes of security protection system due to other devices in the electrical network...
Detection of power quality disturbance is most essential to ensure the good Power Quality (PQ). The power disturbance signal will reduce the reliability of power system and create some disadvantage on operation process. Aging of electrical device, incorrect measurement, devices malfunction are the consequence of this condition. The characteristic of power disturbance signals are non-stationary and...
Auscultation is one of method that has been used by doctor in the process to identify heart disease. But with only using auscultation is not possible to obtain quantitative data, because relating to the skills, experience and subjectivity doctor, for it to be made a program that can help doctors to identify heart abnormalities. Short Time Fourier Transform is used to analyze the frequency and timing...
A radial distribution system have different characteristic when it is installed with distributed generation, especially in protection coordination. However, Over current protection in distribution system influenced from different in fault current when distribution system connected with DG. Therefore, this paper presents optimization based adaptive coordination protection of over current relays using...
A photovoltaic (PV) module is an important source in distributed generation due to low maintenance cost, low operational cost and eco-friendly. Tracking the maximum power point (MPP) of a PV module has been a hot issue to increase energy production. Maximum power point tracking (MPPT) methods based on nature inspired algorithm such as firefly algorithm (FA) has been proposed to track the MPP. However,...
Create an accurate model with over-current relays (OCRs) play an important role in the coordination of power system protection. Modeling of the OCR using methods like the direct data storage and software models gave only approximate models. Moreover, modeling based on mathematical models is not appropriate to deal with ill-defined and uncertain systems. Therefore, in this paper proposes modeling of...
Overcurrent relays (OCRs) play an important role in the protection component that requires high reliability to maintain high security for power systems. Modeling of the OCRcurve using methods like the direct data storage and curve fitting gave only approximate models. Therefore, in this paper proposes modeling of OCRs using Levenberg-Marquardt backpropagation (LMBP). An implementation of OCR in the...
This paper proposes an intelligent control method using Adaptive Neuro-Fuzzy Inference System (ANFIS) for maximum power point tracking (MPPT) of PV module. The method is verified under several irradiance and temperature conditions. DC - DC boost converter is connected between the PV module and the load. Duty cycle of DC - DC boost converter is controlled by ANFIS in order to obtain the MPPT. The ANFIS...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.