Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928805
I. Musa, S. M. Lawal, I. Muhammad
This paper presents the application of Particle Swarm Optimization with inertia weight (PSO-W) algorithm to optimize the integration of Distributed Generation (DG) into a radial distribution network. This study differs from previous in the literature, as the node to which DG is connected was modelled as a generator (PV) node to inject controlled reactive power considering different minimum operating power factors (lagging). The study considered three different scenarios based on two cases. Case I consider DG operation in a network compensated with shunt capacitor and Case II is without the shunt compensation capacitors. The objective of the optimization is to minimize the total power loss and at the same time provide voltage support for the network. The best loss reduction figure and improvement in network voltage support was obtained when two DGs were integrated into the compensated network. However, appreciable results in terms of total power loss reduction and voltage profile improvement were also obtained with the uncompensated network, since DGs could provide network var support.
{"title":"Loss Reduction and Ancillary of Voltage Support with Distributed Generation Considering Different Power Factors","authors":"I. Musa, S. M. Lawal, I. Muhammad","doi":"10.1109/PowerAfrica.2019.8928805","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928805","url":null,"abstract":"This paper presents the application of Particle Swarm Optimization with inertia weight (PSO-W) algorithm to optimize the integration of Distributed Generation (DG) into a radial distribution network. This study differs from previous in the literature, as the node to which DG is connected was modelled as a generator (PV) node to inject controlled reactive power considering different minimum operating power factors (lagging). The study considered three different scenarios based on two cases. Case I consider DG operation in a network compensated with shunt capacitor and Case II is without the shunt compensation capacitors. The objective of the optimization is to minimize the total power loss and at the same time provide voltage support for the network. The best loss reduction figure and improvement in network voltage support was obtained when two DGs were integrated into the compensated network. However, appreciable results in terms of total power loss reduction and voltage profile improvement were also obtained with the uncompensated network, since DGs could provide network var support.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115014689","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928755
A. D. Familua
The conventional radial topology of the electrical power system poses a less reliable power system should there be system failure, thus, resulting into the disruption of electrical power delivery in the network. Increased security threats, theft of electrical energy, and current technological advancements in the information and communications technology (ICT) are factors that ushered in the advent of Smart Grid (SG). The SG, is a modernized electrical grid that utilizes digital or analog ICT to collect and take action on information in an automated fashion to enhance the reliability, efficiency, economics, and sustainability of electricity generation and distribution. For accurate functionality, the SG system has different subsystems, amongst which is the communication subsystem. This subsystem plays an essential role in providing high-speed, reliable and secured real-time transfer and communication of data amongst system devices and other sub-systems interconnected in the SG network so as to effectively and intelligently manage the complex power systems. This paper reviews communication technologies (wired and wireless), that are strong prospects for deployment in a SG, while also highlighting their benefits and challenges.
{"title":"A Review of Communication Technologies for Efficient Communication in the Smart Grid of the 4IR Era","authors":"A. D. Familua","doi":"10.1109/PowerAfrica.2019.8928755","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928755","url":null,"abstract":"The conventional radial topology of the electrical power system poses a less reliable power system should there be system failure, thus, resulting into the disruption of electrical power delivery in the network. Increased security threats, theft of electrical energy, and current technological advancements in the information and communications technology (ICT) are factors that ushered in the advent of Smart Grid (SG). The SG, is a modernized electrical grid that utilizes digital or analog ICT to collect and take action on information in an automated fashion to enhance the reliability, efficiency, economics, and sustainability of electricity generation and distribution. For accurate functionality, the SG system has different subsystems, amongst which is the communication subsystem. This subsystem plays an essential role in providing high-speed, reliable and secured real-time transfer and communication of data amongst system devices and other sub-systems interconnected in the SG network so as to effectively and intelligently manage the complex power systems. This paper reviews communication technologies (wired and wireless), that are strong prospects for deployment in a SG, while also highlighting their benefits and challenges.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132236188","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928848
J. Nelson, S. Panetta
This paper provides a perspective on high resistance grounding (HRG) using symmetrical components. The paper notes that with the use of modern micro-processor-based relaying and zero-sequence current transformers, directional ground relays can sense the zero-sequence capacitive ground fault current on an HRG or ungrounded system. It further presents an analysis of ground fault currents based on distributed stray capacitance. This paper addresses the confusion within the industry by discussing the fact that both zero-sequence ground fault current and charging current flow during a ground fault on an HRG and ungrounded system. A discussion on the differences between charging current and ground fault current will establish that positive-sequence current flows into the capacitance from the system while zero sequence current flows from earth during a ground fault. The charging current is shown to be a positive-sequence current while the ground fault current is shown to be a zero-sequence current. This knowledge is important for the proper analysis and design of the protection system on an HRG or ungrounded system. Finally, the use of an HRG system with proper resistance is shown to be the best method in detecting and isolating a ground fault, especially if the ground fault needs to be automatically removed from the system.
{"title":"High Resistance Grounding Analysis Using Symmetrical Components","authors":"J. Nelson, S. Panetta","doi":"10.1109/PowerAfrica.2019.8928848","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928848","url":null,"abstract":"This paper provides a perspective on high resistance grounding (HRG) using symmetrical components. The paper notes that with the use of modern micro-processor-based relaying and zero-sequence current transformers, directional ground relays can sense the zero-sequence capacitive ground fault current on an HRG or ungrounded system. It further presents an analysis of ground fault currents based on distributed stray capacitance. This paper addresses the confusion within the industry by discussing the fact that both zero-sequence ground fault current and charging current flow during a ground fault on an HRG and ungrounded system. A discussion on the differences between charging current and ground fault current will establish that positive-sequence current flows into the capacitance from the system while zero sequence current flows from earth during a ground fault. The charging current is shown to be a positive-sequence current while the ground fault current is shown to be a zero-sequence current. This knowledge is important for the proper analysis and design of the protection system on an HRG or ungrounded system. Finally, the use of an HRG system with proper resistance is shown to be the best method in detecting and isolating a ground fault, especially if the ground fault needs to be automatically removed from the system.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128534758","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928836
A. A. Sadiq, Sunusi Sani Adamu, Muhammad Buhari
Deregulation ensures competition amongst utilities through open access regulation to accommodate a significant increase in the volume of power transactions. However, this action may cause line overloads and congestion. To relief congestion, improved utilization and performance of transmission infrastructure, different types of FACTS devices are planned with diverse objectives. Often the huge investment cost of FACTS leads to the implementation of a single type of FACTS’ planning by utilities at a given time horizon. To optimize performance, subsequent planning must take into account and coordinate with the existing FACTS regarding location and parameter settings. This article proposed a real power flow Performance Index (PI) and Particle Swarm Optimization (PSO) to locate and coordinate Static synchronous series compensator (SSSC) with an existing Thyristor control series compensator (TCSC) in a standard 9-buses test network. Results of three coordination schemes show that the scheme with more decision parameters provides superior loadability and transfer capability improvement.
{"title":"Multi-type FACTS Location and Coordination using PI-PSO for Transfer Capability Improvement","authors":"A. A. Sadiq, Sunusi Sani Adamu, Muhammad Buhari","doi":"10.1109/PowerAfrica.2019.8928836","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928836","url":null,"abstract":"Deregulation ensures competition amongst utilities through open access regulation to accommodate a significant increase in the volume of power transactions. However, this action may cause line overloads and congestion. To relief congestion, improved utilization and performance of transmission infrastructure, different types of FACTS devices are planned with diverse objectives. Often the huge investment cost of FACTS leads to the implementation of a single type of FACTS’ planning by utilities at a given time horizon. To optimize performance, subsequent planning must take into account and coordinate with the existing FACTS regarding location and parameter settings. This article proposed a real power flow Performance Index (PI) and Particle Swarm Optimization (PSO) to locate and coordinate Static synchronous series compensator (SSSC) with an existing Thyristor control series compensator (TCSC) in a standard 9-buses test network. Results of three coordination schemes show that the scheme with more decision parameters provides superior loadability and transfer capability improvement.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133043370","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928916
T. Ajewole, W. Oyekanmi, K. Alawode, O. Momoh, M. O. Omoigui
Persistent under-performance of the Nigerian power industry after its deregulation shows that the unbundling of the sector has not taken the industry to the envisaged level. It is claimed that the distribution companies have been operating at the mercy of the upstream operators as the performance efficiencies of the former are limited by some operational constraints inherent in the latter. This paper examines the ill-performance of the industry from the standpoint of whether or not the downstream consequences of some operational deficiencies of the upstream operators, particularly the transmission company, are the major trauma bedeviling the distribution companies. Details of the causes of power outages on a total of 81 injection feeders of a distribution network, over a period spanning through 33 months, are acquired from the monitoring Regional Control Centre. The causative factors of the outages are categorized into two: transmission constraints attributed factors (TCAFs) and distribution constraints attributed factors (DCAFs); and the two compared based on the frequency of occurrence. A total of 32,347 power outages are recorded on the network during the period under study, while the most frequently occurring cause of the outages is found to be earth fault. It is also revealed from the analysis that the power outages are predominantly (99.86%) instigated by inherent deficiencies of the distribution facilities rather than operational constraints on the part of the transmission infrastructures.
{"title":"A performance assessment of the distribution subsystem in the deregulated Nigerian power sector","authors":"T. Ajewole, W. Oyekanmi, K. Alawode, O. Momoh, M. O. Omoigui","doi":"10.1109/PowerAfrica.2019.8928916","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928916","url":null,"abstract":"Persistent under-performance of the Nigerian power industry after its deregulation shows that the unbundling of the sector has not taken the industry to the envisaged level. It is claimed that the distribution companies have been operating at the mercy of the upstream operators as the performance efficiencies of the former are limited by some operational constraints inherent in the latter. This paper examines the ill-performance of the industry from the standpoint of whether or not the downstream consequences of some operational deficiencies of the upstream operators, particularly the transmission company, are the major trauma bedeviling the distribution companies. Details of the causes of power outages on a total of 81 injection feeders of a distribution network, over a period spanning through 33 months, are acquired from the monitoring Regional Control Centre. The causative factors of the outages are categorized into two: transmission constraints attributed factors (TCAFs) and distribution constraints attributed factors (DCAFs); and the two compared based on the frequency of occurrence. A total of 32,347 power outages are recorded on the network during the period under study, while the most frequently occurring cause of the outages is found to be earth fault. It is also revealed from the analysis that the power outages are predominantly (99.86%) instigated by inherent deficiencies of the distribution facilities rather than operational constraints on the part of the transmission infrastructures.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"09 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132884248","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928898
A. B. Ogundare, Isaiah Adediji Adejumobi
Nigerian Power Sector Reform Act of 2005 was among others meant to encourage more private participants coming in to the generation of electricity; indicating desire for an expanded network to evacuate generated power. This paper presents the analysis of transmission network expansion using the existing Nigeria 30-bus grid system as a case study. The steady state situation of the system was determined using power flow equations, after which Static Var Controller (SVC) was applied to normalize voltages at those nodes experiencing voltages outside statutory limits of ± 5% and transmission line flows beyond limit capacities. Further assessment to determine critically loaded lines was done using Power Transfer Distribution Factor (PTDF) index, and this was also used to suggest possible locations of the new transmission lines that would stabilize the entire system. From the analysis additional twelve transmission lines are needed for maximum evacuation of generating powers.
{"title":"Transmission Expansion Planning Using Power Transfer Distribution Factor Index","authors":"A. B. Ogundare, Isaiah Adediji Adejumobi","doi":"10.1109/PowerAfrica.2019.8928898","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928898","url":null,"abstract":"Nigerian Power Sector Reform Act of 2005 was among others meant to encourage more private participants coming in to the generation of electricity; indicating desire for an expanded network to evacuate generated power. This paper presents the analysis of transmission network expansion using the existing Nigeria 30-bus grid system as a case study. The steady state situation of the system was determined using power flow equations, after which Static Var Controller (SVC) was applied to normalize voltages at those nodes experiencing voltages outside statutory limits of ± 5% and transmission line flows beyond limit capacities. Further assessment to determine critically loaded lines was done using Power Transfer Distribution Factor (PTDF) index, and this was also used to suggest possible locations of the new transmission lines that would stabilize the entire system. From the analysis additional twelve transmission lines are needed for maximum evacuation of generating powers.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124675904","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928823
J. Aredjodoun, P. Chetangny, S. Houndedako, A. Vianou, D. Chamagne, C. Espanet
This work deals with the problem of optimal design of a fully passive small wind turbine chain whose main components are the wind rotor and the generator. This involves optimizing the synchronous generator with permanent magnets, and secondly ensuring mutual adaptation between the wind rotor and the optimized generator, so that the assembly is more attractive and more sensitive to the conversion of wind energy. Thus, we are interested in maximizing the electromagnetic torque of the machine while minimizing the total cost of the active part of the machine. Then we adapted the characteristics of the wind rotor to those of the optimized generator. The originality of this work was to find, for a given performance generator, the radius of the sail according to the wind potential of the location. A bi-objective optimization based on the genetic algorithm allowed us to obtain good results. The analysis of these results shows that for an optimized generator there is a radius of the wing adapted to a given wind speed.
{"title":"Optimal adaptation of the wind rotor to the permanent magnets synchronous generator of a small passive wind turbine","authors":"J. Aredjodoun, P. Chetangny, S. Houndedako, A. Vianou, D. Chamagne, C. Espanet","doi":"10.1109/PowerAfrica.2019.8928823","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928823","url":null,"abstract":"This work deals with the problem of optimal design of a fully passive small wind turbine chain whose main components are the wind rotor and the generator. This involves optimizing the synchronous generator with permanent magnets, and secondly ensuring mutual adaptation between the wind rotor and the optimized generator, so that the assembly is more attractive and more sensitive to the conversion of wind energy. Thus, we are interested in maximizing the electromagnetic torque of the machine while minimizing the total cost of the active part of the machine. Then we adapted the characteristics of the wind rotor to those of the optimized generator. The originality of this work was to find, for a given performance generator, the radius of the sail according to the wind potential of the location. A bi-objective optimization based on the genetic algorithm allowed us to obtain good results. The analysis of these results shows that for an optimized generator there is a radius of the wing adapted to a given wind speed.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124845362","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928927
E. Ogunniyi, C. Pienaar
Renewable energy sources such as solar and wind have become mainstream sources of electricity generation in recent years, largely deployed globally towards energy sustainability and reduction of carbon emission. In Africa however, it is paradoxical that despite the vast potentials in annual solar radiation and wind power compared to other developing nations, the continent’s overall energy generation from these are still at meagre level, insufficient to power the continent. Although various challenges and risks could contribute to this, it is essential that to power the continent, the renewable sources need to be unlocked to their maximum potentials while avoiding restrictions to stand-alone systems which have limited applications. In this paper, an overview of wind and solar energy potentials in Africa is presented. Towards more utilization of these, more investments in and development of utility-scale and hybrid renewable energy system are essential while this should go pari-passu development of utility-scale energy storage systems among other factors.
{"title":"Paradox of Africa’s Renewable Energy Potentials and Quest towards Powering Africa","authors":"E. Ogunniyi, C. Pienaar","doi":"10.1109/PowerAfrica.2019.8928927","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928927","url":null,"abstract":"Renewable energy sources such as solar and wind have become mainstream sources of electricity generation in recent years, largely deployed globally towards energy sustainability and reduction of carbon emission. In Africa however, it is paradoxical that despite the vast potentials in annual solar radiation and wind power compared to other developing nations, the continent’s overall energy generation from these are still at meagre level, insufficient to power the continent. Although various challenges and risks could contribute to this, it is essential that to power the continent, the renewable sources need to be unlocked to their maximum potentials while avoiding restrictions to stand-alone systems which have limited applications. In this paper, an overview of wind and solar energy potentials in Africa is presented. Towards more utilization of these, more investments in and development of utility-scale and hybrid renewable energy system are essential while this should go pari-passu development of utility-scale energy storage systems among other factors.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130395814","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928820
Dawit Gebremeskel, Getachew Bekele, E. Ahlgren
Recently, the government of Ethiopia has been shaking up the power industry by introducing reforms with the hope of increasing electricity access, ensuring resource adequacy, stimulating private investment and guaranteeing financial sustainability of the sector. Restructuring of utility, liberalizing energy market, tariff revision, targeting universal access, and export market are some of the sea changes undertaken by the government. The expected return from these reforms is very high, sometimes to a level that it looks too good to be true. The study thus evaluates the effectiveness of the reforms by assessing the future generation adequacy in contrast to the growing electricity demand. An analytical method to calculate resource planning indices such as reserve margin and expected unserved energy is used. The results show that the Ethiopian power system will face about 10 TWh energy shortage in the near-future. The study begins by providing an overview of the power sector and the recent reform activities with their intentions and goals. The result of the study could be important as input for making policy-adjustments and/or revamping implementation strategies.
{"title":"Assessment of Resource Adequacy in Power Sector Reforms of Ethiopia","authors":"Dawit Gebremeskel, Getachew Bekele, E. Ahlgren","doi":"10.1109/PowerAfrica.2019.8928820","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928820","url":null,"abstract":"Recently, the government of Ethiopia has been shaking up the power industry by introducing reforms with the hope of increasing electricity access, ensuring resource adequacy, stimulating private investment and guaranteeing financial sustainability of the sector. Restructuring of utility, liberalizing energy market, tariff revision, targeting universal access, and export market are some of the sea changes undertaken by the government. The expected return from these reforms is very high, sometimes to a level that it looks too good to be true. The study thus evaluates the effectiveness of the reforms by assessing the future generation adequacy in contrast to the growing electricity demand. An analytical method to calculate resource planning indices such as reserve margin and expected unserved energy is used. The results show that the Ethiopian power system will face about 10 TWh energy shortage in the near-future. The study begins by providing an overview of the power sector and the recent reform activities with their intentions and goals. The result of the study could be important as input for making policy-adjustments and/or revamping implementation strategies.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130039217","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}
Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica46609.2019.9078670
Eya, Candidus.U, Crescent Onyebuchi Omeje, J. M. Ukwejeh
This paper presents a solar-powered five level output voltage of a DC-to-AC converter using simplified Capacitor Voltage Controlled Scheme. It is configured by the combination of thin-film silicon Photovoltaic panels, insulated gate bipolar transistors, capacitors, power diodes and boost converter. A boost converter in-conjunction with PI controller ensures voltage balancing across the input DC series-connected capacitors. The system possesses the following characteristics: (i) it is portable (ii) it has very low total harmonic distortions (iii) It is cheap and simple to design. (iv) It utilizes single DC source. (v) It uses capacitors with appreciable capacitances (vi) the solar panels used are shadow tolerant due to the design of the thin-film silicon module. The following results were obtained: Stabilized five level output voltage inverter with THD of 0.95% and modulation index of 0.9. Power rating of 2.0 kW at a time interval of 0 ⩽ t ⩽1.8 seconds. The MatLab/Simulink software was used in this work.
{"title":"Solar-powered Five Level Output Voltage of DC-TO-AC Converter Using Simplified Capacitor Voltage Controlled Scheme (SCVCS)","authors":"Eya, Candidus.U, Crescent Onyebuchi Omeje, J. M. Ukwejeh","doi":"10.1109/PowerAfrica46609.2019.9078670","DOIUrl":"https://doi.org/10.1109/PowerAfrica46609.2019.9078670","url":null,"abstract":"This paper presents a solar-powered five level output voltage of a DC-to-AC converter using simplified Capacitor Voltage Controlled Scheme. It is configured by the combination of thin-film silicon Photovoltaic panels, insulated gate bipolar transistors, capacitors, power diodes and boost converter. A boost converter in-conjunction with PI controller ensures voltage balancing across the input DC series-connected capacitors. The system possesses the following characteristics: (i) it is portable (ii) it has very low total harmonic distortions (iii) It is cheap and simple to design. (iv) It utilizes single DC source. (v) It uses capacitors with appreciable capacitances (vi) the solar panels used are shadow tolerant due to the design of the thin-film silicon module. The following results were obtained: Stabilized five level output voltage inverter with THD of 0.95% and modulation index of 0.9. Power rating of 2.0 kW at a time interval of 0 ⩽ t ⩽1.8 seconds. The MatLab/Simulink software was used in this work.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129513434","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}
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