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The faults can happen to transmission lines at any time, any places and caused by different reasons. An accurate and fast solution to detect, locate and isolate the faults will improve the quality of the power systems' performance. The time domain reflectometry (TDR) method basing on the analysis of reflected waveforms on the transmission lines to detect the faults and estimate the fault resistance...
This work introduces a electric-thermal model for a photovoltaic (PV) cell which combines electrical and thermal parameters, and also incorporates dynamic characteristics and accurate modeling in the reverse-bias region. Incoming irradiance and ambient temperature are used to calculate the PV cell temperature based on a five-layer thermal model. The cell temperature in the electrical model is updated...
Industrial wastewater pretreatment through the anaerobic digestion is able to generate both biogas and electricity in microbial fuel cells (MFCs). In this work, hydrogen was produced in MFC combining rice vermicelli wastewater treatment using enriched hydrogen producing consortia. Effects of sludge pretreatment and addition of supplements, mediator (lignin) and glucose were studied to determine the...
Permanent magnet BLDC motor can be designed with different rotor configurations based on the arrangement of the permanent magnets. Rotor configurations strongly influence the performance of permanent magnet electrical machines. The aim of this paper is to compare and evaluate different rotor configurations for PMBLDC motor. Most of the applications prefer surface mounted permanent magnet design due...
This paper presents a novel dual-band rectenna for RF energy harvesting system. This rectenna is created from a dual-band antenna and a dual-band rectifier which operates at GSM bands (900 MHz and 1800 MHz). The printed monopole antenna is miniaturized by two meander-lines. The received signal from the receiving antenna is rectified by a voltage doubler using Schottky diode SMS-7630. The rectifier...
The utilization rate of the power conditioner in the grid-tied solar power system is low because the operation of photovoltaic (PV) cell depends on the sunlight. Adding the small scale wind power generating system to the existing solar power system can increase the utilization rate of the power conditioner. In this paper, we propose a novel design method by which the small scale wind power generating...
The faults in a microgrid (MG) pose many challenges for operation of the system. They may lead to an increase in the operation cost. In this paper, in order to solve the problem, a novel algorithm based on the auto-configuration of MGs is proposed for minimizing the operation cost in grid-connected mode. A centralized energy management system (EMS) is also developed in accordance with the proposed...
The design of an observer for battery state of charge (SoC) and state of health (SoH) using data-driven models is addressed. SoH estimation is an important issue in battery management system design for (hybrid) electrical vehicles. Without SoH correction, the accuracy of the SoC indication system will decrease progressively with battery age/degradation. In order to take the battery degradation into...
The installed capacity of photovoltaic (PV) generation in Japan is currently more than 20 GW. This capacity has been rapidly increasing since the start of the feed-in tariff policy in 2012. The installed capacity after 2030 may be considerably larger than the current supposition if this trend continues. In this study, we conducted numerical simulations of the demand and supply operation with consideration...
The stochastic nature of the wind and the highly non linear transform from wind speed to electrical energy makes it more difficult to determine how to dispatch the power in order to guarantee both operational cost reduction and power system security. From a network constraint perspective for the economic dispatch problem one of the factors to be accounted for is voltage security, which impacts both...
In future distribution grids with high penetration of distributed generators more stable solutions may appear because of active or reactive power reversal. The systems can operate at very different states, and additional control measures may be required to ensure that it remains at the appropriate point. Under typical scenarios such as subjected to disturbances or load shedding, the system may be...
Nowadays, wind energy has become a very viable alternative solution to provide electrical energy. The development of wind energy is especially relevant for the case of isolated island in the south central provinces of Vietnam, where there is great potential for wind energy. For these isolated systems, the co-generation of diesel generators and wind turbines is a common configuration, but also poses...
Frequency Response Analysis (FRA) is an offline condition monitoring technique commonly used to diagnose the mechanical integrity of transformers. Due to high accuracy and sensitivity, FRA has become a common practice in the industry for assessment of winding health. However, interpretation of FRA measurements is still limited to analysis by field engineers relying entirely on their past experiences...
This paper presents a mathematical model for the energy bidding problem of a virtual power plant (VPP) that participates in the regular electricity market and intraday demand response exchange (DRX) market considering different system uncertainties due to the intermittent renewable energy sources, retail customers' demand and electricity prices. By participating in the DRX market, the VPP can purchase...
Power industry has restructured in last decades and now it has become a commodity rather than a utility with the maximization of profit as its main purpose. Peak ripples in the electricity demand curve could disturb the economic generation. In developing countries, Electric Supply Companies are unable to meet the existing power demand due to unfeasible and unjustified fuel burning. Therefore, they...
Channel induction furnaces are commonly used for heating and melting alloys in the foundry industry worldwide. The melting frequency is the main issue when constructing an efficient channel furnace. This work investigates an efficient frequency for achieving more favorable results in channel induction furnaces through simulation in two-dimensional space using ANSYS Maxwell. Additionally, the best...
In this paper, we present a coalitional game theoretic approach to address a profit sharing problem for cooperative wind power producers (WPP) that participate in the short-term energy market. Our design aims to determine the percentage quota of total cooperation's expected profit allocated to each WPP considering the uncertainties of wind and electricity prices. In particular, we propose a minmax...
This paper presents an online Adaboost algorithm for ensemble of support vector machines (SVM) for power system security assessment utilizing online measurement data obtained from Phasor Measurement Units (PMUs). Our proposed learning scheme consists of a strong learner and multiple weak learners. The weak learners are linear SVMs which are easy to implement and incrementally updated with low computation...
With the improvement in standard of living of human beings, better home/office environment is required. Nowadays, intelligent home designs are becoming a trend in which intelligence can be built-in to provide improved user comfort at an incremental cost. However, many of the mature systems do not care about the energy savings. This paper presents a smart home solution with energy conservation in mind...
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