{"title":"Transformer insulation diagnosis using hybrid artificial intelligence-modified particle swarm optimisation","authors":"H. Illias, X. Chai","doi":"10.1109/CENCON.2017.8262494","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262494","url":null,"abstract":"A hybrid neural network (NN)-modified particle swarm optimisation technique was proposed in this work for determination of the fault type in power transformer insulation system. The artificial NN (ANN) characteristics were optimised by modified particle swarm optimisation (PSO) with coefficient of time-varying acceleration (TVAC). The improvement of the modified PSO-TVAC over other methods including ANN without optimisation, the existing diagnosis methods and previous works was validated by comparison between each method. It was observed that the proposed hybrid ANN-modified PSO-TVAC managed to achieve the largest correct fault type identification than other methods. Hence, this shows that the proposed method can be applied in fault type determination of actual power transformers.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"389 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131914260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"State of charge estimation for liquid metal battery using Kalman filter","authors":"Xian Wang, Zhengxiang Song, Tao Li, Yingsan Geng, Jianhua Wang, Yupeng Cao, Haihong Liang","doi":"10.1109/CENCON.2017.8262460","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262460","url":null,"abstract":"This paper proposed an effective battery model together with a state of charge(SOC) estimation model designed specifically for Liquid Metal Battery (LMB). LMB is a potential energy storage battery very suitable for power grid, with long life-span, large charge current and high energy density. The parameters of this LMB model was determined based on the second order Thevenin circuit. The value of these parameters was calculated according to the experimental data and global optimization algorithm. Data comparison between the battery terminal voltage obtained from the experiment and calculated by model is made to prove the accuracy of the LMB model. The SOC estimation model was built using Kalman Filter algorithm and the LMB model established in this paper. The SOC estimation model performed an accurate performance without the necessity of an initial value under different dynamic conditions or static condition. Data comparison between the SOC obtained from the experiment and calculated by model is made to prove the accuracy of the SOC estimation model. The root-mean-square error of these two sets of data is 0.0171.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114202448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"In-situ fast thermal detection method for large-scale photovoltaic field under shading conditions","authors":"H. Shareef, Zahi M. Omer, Mohamed N. Zareer","doi":"10.1109/CENCON.2017.8262488","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262488","url":null,"abstract":"PV power plants are subjected to faults and failures and typically requires fast and precise diagnosis. For large scale PV plant, fault diagnosis is expensive due to shutdown periods and maintenance cost. In this paper, a cost-effective method has been proposed for partial/permanent shading conditions detection using thermal signatures. The simulation was conducted using the COMSOL program. Results show that there are distinctive temperature variation signature at different shading degrees. The thermal simulation results are further validated experimentally by utilizing an array of temperature sensors. In addition, PV module terminal voltage output vary proportionally to the imposed shading level. A variation of 2 to 3 °C degrees per 20% shading level increment has been recorded.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128094819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Azmi, M. F. N. Tajuddin, M. F. Mohamed, L. J. Hwai
{"title":"Multi-loop control strategies of three-phase two-level current source inverter for grid interfacing photovoltaic system","authors":"S. Azmi, M. F. N. Tajuddin, M. F. Mohamed, L. J. Hwai","doi":"10.1109/CENCON.2017.8262498","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262498","url":null,"abstract":"The use of voltage source inverters (VSIs) in grid integration of photovoltaic (PV) systems have been research extensively and always be priority despite of the drawbacks of short lifespan of dc-link capacitor and inherent buck features. With regard to that, researchers continue to find feasible alternative topologies that may offer promising capabilities as in VSIs. Current source inverter (CSI) is one of the competitive options since it has inherent voltage boosting capability and continuous dc input current. These features are important requirements in PV application. Thus, this paper study on the option of using CSI system to supply the ac grid with the required controlled active and reactive powers. The presented control strategy uses number of feedbacks loops to enable fast and accurate tracking of the desired set-points with minimum overshoot. The selection of feedback control variables are discussed using stability analysis. The proposed control strategy is verified by MATLAB/SIMULINK platform.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127373185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. H. A. Khanipah, M. Azri, Md. Hairul Nizam Talib, Z. Ibrahim, N. Rahim
{"title":"Interleaved boost converter for fuel cell application with constant voltage technique","authors":"N. H. A. Khanipah, M. Azri, Md. Hairul Nizam Talib, Z. Ibrahim, N. Rahim","doi":"10.1109/CENCON.2017.8262457","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262457","url":null,"abstract":"This paper presents the simulation of fuel cell models and interleaved DC-DC boost converter (IBC) using a constant voltage maximum power point tracking (MPPT) technique. The main advantage of this method is it had the simplest algorithm and can be computed for the high-efficiency IBC. The MPPT technique forces the fuel cell to meet the maximum power that the fuel cell can generate. To test the IBC along with the MPPT algorithm, MATLAB/Simulink simulation is carried out. This MPPT method increases the efficiency of power delivered from the fuel cell. The IBC has also chosen for its advantages of reduction of passive component's size, as well as reduced the current ripple that could affect the fuel cell stack. It is envisaged that the MPPT method of constant voltage gives a handful of help in designing a low cost and high efficient fuel cell system along with the interleaved boost converter chosen.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129776167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Super-capacitor and Li-polymer battery hybrid energy storage for kinetic energy harvesting applications","authors":"Qi Wang, Chong Shen, Kun Zhang, Liqiang Zheng","doi":"10.1109/CENCON.2017.8262461","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262461","url":null,"abstract":"This paper presents a self-power interface circuit with hybrid energy storage unit (ESU) for kinetic energy harvesting applications using super-capacitor and Li-polymer battery (LPB). The use of super-capacitor and charge management chip extend the battery's life. On the other hand, the Li-polymer battery (LPB) reduce the energy loss due to leakage current and equivalent series resistance (ESR). The paper also shows the characterizations of the ESUs for energy harvesting powered smart basketball hardware module. Before the power management circuit proposed, the kinetic energy-harvesting test system (KETS) is presented and used to evaluate the power generation characteristics of electromagnetic energy harvester with impact-type vibration. The optimized electromagnetic vibration harvester (EVH) can produce a power of 4.0 mW at low frequencies (< 10Hz).","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132942887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A hybrid multilevel inverter with reduced power electronic components with unipolar trapezoidal pulse width modulation","authors":"N. Prabaharan, Z. Salam, K. Palanisamy","doi":"10.1109/CENCON.2017.8262499","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262499","url":null,"abstract":"In this paper, a hybrid multilevel inverter is proposed with a minimum number of power electronics component for making the quality of output voltage waveform which is utilized for medium/high power application. The proposed multilevel inverter is the combination of a full bridge (H-bridge) and single phase reduced switch multilevel inverter. In this work, the full bridge inverter performs to increase the output voltage level is twice when compared with existing output voltage level. The reduced switch multilevel inverter has the switch and diode combination with separate DC source per basic unit. It can operate at both symmetric and asymmetric sequences, especially in the binary sequence. If the reduced switch multilevel inverter topology operates at the symmetric condition, the proposed topology will generate 11-level output voltage whereas the reduced switch topology operates in a binary sequence, the proposed topology will generate the 15-level output voltage. The % total harmonic distortion for 11-level and 15-level is 10.47% and 8.19%. Selected simulation results are shown in order to verify the operation of the proposed topology at both conditions.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133932253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A compact and reliable pulse generator using dual 555-timer IC to produce PWM method","authors":"N. F. Kasri, M. Piah","doi":"10.1109/CENCON.2017.8262466","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262466","url":null,"abstract":"One of distinguished nonthermal methods in food processing is the pulsed electric field (PEF) and typically be made up of a pulse generator, high-voltage supply, treatment chamber and control system. To enhance the inactivation rate of microorganisms, pulse generator supposed to deliver an accurate and steady pulse signal. Due to this demand, the idea to innovate an existing pulse generator is significant to be conducted. Thus, this paper proposes a technique to generate an accurate and steady square pulse signal using a combination of two units 555-timer IC. The objective of using dual IC is to obtain a pulse width modulation (PWM) method, which its duty cycle and frequency can be altered independently. The simulation result shows parallel comprehension with the objective, where the duty cycle is successfully adjusted from 10% to 90% of full cycle without affecting its frequency. The alteration is achieved by tuning the value of the variable resistor. In addition, the frequency is varied at selected value ranging from Hz to MHz, just to show that 555-timer IC can provide various frequency levels. The frequency can be determined by choosing the right value of the resistor and capacitor in the circuitry system. Therefore, this pulse generator can be executed to drive switching device such as MOSFET and IGBT to produce an accurate and steady high-voltage pulses which give rise to high intensity pulse electric field, thus kill the bacteria effectively.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116553646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A DC-DC buck converter with maximum power point tracking implementation for photovoltaic module application","authors":"Abdullah Altamimi, Z. Khan","doi":"10.1109/CENCON.2017.8262503","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262503","url":null,"abstract":"Use of DC-DC converter in continuous operation mode can enhance the energy extraction from solar panels. This paper presents a DC-DC buck converter model with reduced size and yet yielding high efficiency. A DC-DC converter which generates a constant DC voltage was selected to observe the photovoltaic operation at maximum power point (MPP). The filtering parameters of the converter were computed and selected with a metal-oxide-semiconductor field-effect transistor (MOSFET) switching at a frequency of 25 kHz. However, the I-V (current-voltage) characteristic is affected by irradiation and temperature, which have a nonlinear relationship. This requires the duty cycle to be calculated and changed to turn the converter to the maximum power available. The change in irradiation and temperature give a different MPP at different curves. Thus, voltage and current sensors and a microcontroller are required to calculate the optimum duty ratio to operate always at MPP. In order to generate a pulse width modulation (PWM) to control converter switch (the MOSFET), the microcontroller is controlled by an algorithm that has been written in C programming language. The algorithm of the MPP tracker (MPPT) operation is achieved by using the perturbation and observation (P&O) method to provide high tracking accuracy and fast response. Furthermore, the system has been designed using MATLAB and PLECS platforms. The simulation results are validated by developing a prototype. The empirical results validated the simulations.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127837933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Comparison of LCL resonant converter with fixed frequency, and variable frequency controllers","authors":"M. Salem, A. Jusoh, N. Idris, Ibrahim Alhamrouni","doi":"10.1109/CENCON.2017.8262463","DOIUrl":"https://doi.org/10.1109/CENCON.2017.8262463","url":null,"abstract":"This paper presents a three element DC-DC resonant converter type LCL. The proposed converter provides high output voltage gain with wide zero voltage switching (ZVS) operating range. The converter achieves wide load variation by utilizing fixed frequency (duty-cycle), and variable frequency control, where the gain of the converter is analyzed in relation with the tank impedance that depends on the switching frequency to resonant frequency ratio. Moreover, the utilizing of the magnetizing inductance ensures the achievement of the ZVS for all switches. The proposed converter with both control methods were simulated using MATLAB-SIMULINK. It was found that by controlling the duty cycle, the resonant tank sinusoidal waveforms were missing at load changes. However, with variable frequency control the resonant converters behave well compared to fixed frequency control in term of keeping the tank resonant variables. Besides, it was noticed that both control methods have the ability to deal with output voltage regulation.","PeriodicalId":275077,"journal":{"name":"2017 IEEE Conference on Energy Conversion (CENCON)","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127398552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}