Pub Date : 2019-08-01DOI: 10.1109/PowerAfrica.2019.8928788
R. Chidzonga, B. Nleya
Implementation of Renewable Energy Sources (RES) has reshaped the current power grid and given birth to what’s now commonly referred to as the Smart Grid (SG). RES innovations have enhanced accessibility of electrical power to satisfy the consumer loads chiefly for residential and commercial entities. Industry consumes the bulk of generated power. The proposed Home Energy Management System (HEMS) uses the Earliglow algorithm for load shifting within the context of Demand Side Management. The simulation results are compared with other results in the literature: These results show that the combination of RES and Energy Storage Systems (ESS) can provide substantial electricity cost cutting using both Critical Peak Pricing (CPP) and Time of Use (ToU) utility tariffs. Additionally, electricity cost reduction under the CPP and ToU regimes are demonstrated. The importance of the results lies in the possible deferral of costly electrical network capacity expansion often necessitated by ever growing demand of electricity as well as possibility of greater reach of electrical energy to the wider populace in the developing world.
{"title":"Power Scheduling In a Smart Home Using Earliglow Optimization","authors":"R. Chidzonga, B. Nleya","doi":"10.1109/PowerAfrica.2019.8928788","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928788","url":null,"abstract":"Implementation of Renewable Energy Sources (RES) has reshaped the current power grid and given birth to what’s now commonly referred to as the Smart Grid (SG). RES innovations have enhanced accessibility of electrical power to satisfy the consumer loads chiefly for residential and commercial entities. Industry consumes the bulk of generated power. The proposed Home Energy Management System (HEMS) uses the Earliglow algorithm for load shifting within the context of Demand Side Management. The simulation results are compared with other results in the literature: These results show that the combination of RES and Energy Storage Systems (ESS) can provide substantial electricity cost cutting using both Critical Peak Pricing (CPP) and Time of Use (ToU) utility tariffs. Additionally, electricity cost reduction under the CPP and ToU regimes are demonstrated. The importance of the results lies in the possible deferral of costly electrical network capacity expansion often necessitated by ever growing demand of electricity as well as possibility of greater reach of electrical energy to the wider populace in the developing world.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"69 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":"127080104","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.2019.8928637
E. Buraimoh, I. Davidson
This paper deals with a developed insulated gate bipolar transistor (IGBT) and diode based fault current limiter (FCL) for simple microgrid application. The developed FCL utilizes a three-phase circuit arrangement that has fault current limiting ability with an uncomplicated control strategy that simply samples the voltage at the point of common coupling (PCC) for the FCL control using Clarke’s Transformation, low pass filtering and pulse generating circuit. The IGBT-Diode based FCL regulates the magnitude of the fault current and enhances the PCC voltage under transient faults to ensure continuous supply of active and reactive power to the local load of the microgrid irrespective of the transient condition of the main grid. The power electronic switching arrangement employed interfaces the grid using an isolating transformer whose primary is connected in series with the feeder line and the secondary is shorted by an optimally sized AC reactor. The IGBT-Diode switching operations for the pre-fault, fault and post-fault conditions are triggered by the control proposed which detects fault occurrence in less than a period. The analytical investigation of the IGBT-Diode switched FCL is presented in details and the results of simulation lay credence to effectiveness of the developed FCL in improving Fault Ride-Through (FRT).
{"title":"Development of an IGBT-Diode based Fault Current Limiter for Fault Ride-Through Enhancement in Microgrid Application","authors":"E. Buraimoh, I. Davidson","doi":"10.1109/PowerAfrica.2019.8928637","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928637","url":null,"abstract":"This paper deals with a developed insulated gate bipolar transistor (IGBT) and diode based fault current limiter (FCL) for simple microgrid application. The developed FCL utilizes a three-phase circuit arrangement that has fault current limiting ability with an uncomplicated control strategy that simply samples the voltage at the point of common coupling (PCC) for the FCL control using Clarke’s Transformation, low pass filtering and pulse generating circuit. The IGBT-Diode based FCL regulates the magnitude of the fault current and enhances the PCC voltage under transient faults to ensure continuous supply of active and reactive power to the local load of the microgrid irrespective of the transient condition of the main grid. The power electronic switching arrangement employed interfaces the grid using an isolating transformer whose primary is connected in series with the feeder line and the secondary is shorted by an optimally sized AC reactor. The IGBT-Diode switching operations for the pre-fault, fault and post-fault conditions are triggered by the control proposed which detects fault occurrence in less than a period. The analytical investigation of the IGBT-Diode switched FCL is presented in details and the results of simulation lay credence to effectiveness of the developed FCL in improving Fault Ride-Through (FRT).","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"2016 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":"127363151","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.2019.8928800
H. C. Idoko, L. Anih
This paper presents the modelling and analysis of a Transfer Field (TF) machine with displaced windings. In this machine, there are two identical polyphase windings in the stator displaced by an arbitrary angle ε. The two component fields revolving in the airgap are of the same pole number and the speed of operation is inversely proportional to the sum of the two pole numbers, that is, half the synchronous speed $frac{omega }{2}$ of a normal induction motor. There is thus, a close relationship between the self-cascaded induction machine and the TF machine. The effect of displaced angle on performance characteristics of the machine was investigated in both dynamic and steady states. It is shown that the performance characteristics of the machine is optimum when the two polyphase stator windings are displaced by 25 electrical degrees. The maximum output power and starting torque increased by 136.8% and 25.3% respectively.
本文对具有移位绕组的传递场电机进行了建模和分析。在这种机器中，定子中有两个相同的多相绕组，其位移为任意角度ε。在气隙中旋转的两分量场具有相同的极数，运行速度与两极数之和成反比，即为普通感应电动机同步速度$frac{omega }{2}$的一半。因此，自级联感应电机与TF电机之间有着密切的关系。从动态和稳态两方面研究了位移角对机床性能特性的影响。结果表明，当两个多相定子绕组位移25度时，电机的性能特性最优。最大输出功率和起动转矩提高136.8% and 25.3% respectively.
{"title":"Modelling and Analysis of a Transfer Field Machine with Displaced Windings","authors":"H. C. Idoko, L. Anih","doi":"10.1109/PowerAfrica.2019.8928800","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928800","url":null,"abstract":"This paper presents the modelling and analysis of a Transfer Field (TF) machine with displaced windings. In this machine, there are two identical polyphase windings in the stator displaced by an arbitrary angle ε. The two component fields revolving in the airgap are of the same pole number and the speed of operation is inversely proportional to the sum of the two pole numbers, that is, half the synchronous speed $frac{omega }{2}$ of a normal induction motor. There is thus, a close relationship between the self-cascaded induction machine and the TF machine. The effect of displaced angle on performance characteristics of the machine was investigated in both dynamic and steady states. It is shown that the performance characteristics of the machine is optimum when the two polyphase stator windings are displaced by 25 electrical degrees. The maximum output power and starting torque increased by 136.8% and 25.3% respectively.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"5093 4 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":"114379962","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.2019.8928780
T. Ayodele, O. Durodola, A. Ogunjuyigbe, Josiah Lange Munda
This paper presents the influence of four operating factors (plastic type i.e feedstock, temperature, heating rate and the reaction time) on the bio-oil yield obtainable from pyrolysis of plastics wastes. To achieve this, twenty-seven (27) different experiments conducted on the pyrolysis of various plastic types under different pyrolytic operating conditions were sourced from different literature and then modelled using response surface methodology (RSM). This is to facilitate the establishment of regression relationship between the operating factors and the probable bio-oil yield from plastic waste making it possible to determine the impact of the operating factors. Some of the key results show that the regression model derived from the RSM could effectively model and predict the bio oil yield using the four operating factors with the R–square and the adjusted R–square value of 92.2% and 83.2%, respectively. It is also revealed that the different interactions among the factors result into different bio-oil production, hence, the need for determining the best interaction among the influencing factors for maximum bio-oil production. It can be generally observed from the results that temperature and plastic type (feedstock) have very strong effect on pyrolysis process of bio-oil production. Too high or too low temperature as well as the type of plastic used as feedstock could cause a very high variation in the bio-oil yield. The effect of reaction time is seen to be minimal as it is nearly constant for all the investigated scenarios.
{"title":"Effects of Operating Factors on the Bio-Oil Produced from Pyrolysis of Plastic Wastes using Response Surface Methodology","authors":"T. Ayodele, O. Durodola, A. Ogunjuyigbe, Josiah Lange Munda","doi":"10.1109/PowerAfrica.2019.8928780","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928780","url":null,"abstract":"This paper presents the influence of four operating factors (plastic type i.e feedstock, temperature, heating rate and the reaction time) on the bio-oil yield obtainable from pyrolysis of plastics wastes. To achieve this, twenty-seven (27) different experiments conducted on the pyrolysis of various plastic types under different pyrolytic operating conditions were sourced from different literature and then modelled using response surface methodology (RSM). This is to facilitate the establishment of regression relationship between the operating factors and the probable bio-oil yield from plastic waste making it possible to determine the impact of the operating factors. Some of the key results show that the regression model derived from the RSM could effectively model and predict the bio oil yield using the four operating factors with the R–square and the adjusted R–square value of 92.2% and 83.2%, respectively. It is also revealed that the different interactions among the factors result into different bio-oil production, hence, the need for determining the best interaction among the influencing factors for maximum bio-oil production. It can be generally observed from the results that temperature and plastic type (feedstock) have very strong effect on pyrolysis process of bio-oil production. Too high or too low temperature as well as the type of plastic used as feedstock could cause a very high variation in the bio-oil yield. The effect of reaction time is seen to be minimal as it is nearly constant for all the investigated scenarios.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"4 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":"114491890","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.2019.8928651
J. Chukwuma, Dele Fayomi, N. Echoda, Olisa Chukwuma
In this paper, we do a detailed analysis of consumption trends and applicable tariffs for three randomly selected customers (each representing a consumer class) of the Enugu Electricity Distribution Company (DisCo). The consumer classes studied are of the following types: residential(R), commercial(C) and industrial(D) all of whom are present in the Enugu demographics. We correlate the power credits against the power consumption over a period of one year, we also predict the limit at which the tariff structure of a typical DisCo may be impacted by consumers exploiting the fixed tariff structure.
{"title":"The Tariff Value Chain: A Study of Three Customers of the Enugu Electricity Distribution Company","authors":"J. Chukwuma, Dele Fayomi, N. Echoda, Olisa Chukwuma","doi":"10.1109/PowerAfrica.2019.8928651","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928651","url":null,"abstract":"In this paper, we do a detailed analysis of consumption trends and applicable tariffs for three randomly selected customers (each representing a consumer class) of the Enugu Electricity Distribution Company (DisCo). The consumer classes studied are of the following types: residential(R), commercial(C) and industrial(D) all of whom are present in the Enugu demographics. We correlate the power credits against the power consumption over a period of one year, we also predict the limit at which the tariff structure of a typical DisCo may be impacted by consumers exploiting the fixed tariff structure.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"29 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":"129723703","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.2019.8928640
Christie Etukudor, V. Robu, Benoit Couraud, Gudrun Kocher, W. Früh, D. Flynn, Chinonso Okereke
Electricity-access is a growing concern in developing countries of Sub-Saharan Africa where approximately 563million people (8% of the global population) lack electricity. Many use fossil-fuel generators and/or solar-home-systems (SHSs) with storage. Given the observed excess and unutilized electricity generated from these SHSs, a novel community peer-to-peer (P2P) electricity-market using automated negotiations is presented as a solution to improve access to electricity. Software agents representing World Bank Tiers 1 – 4 electricity-access households bilaterally negotiate electricity price and quantities applying five different negotiations heuristics. Simulation results show 65 – 100% trade of the excess generation; with Tiers 1 – 2 (low-income households) negotiating sufficient electricity (1 – 1.1kWh/day) at the least market-price of £0.35/kWh to move to Tier 3. Likewise, the Tier 3 household agent negotiated 1.5kWh/day sufficient to meet its needs. This novel electricitymarket model can help drive the United Nations goal of affordable, sustainable and modern energy for all by 2030.
{"title":"Automated Negotiation for Peer-to-Peer Trading of Renewable Energy in Off-Grid Communities","authors":"Christie Etukudor, V. Robu, Benoit Couraud, Gudrun Kocher, W. Früh, D. Flynn, Chinonso Okereke","doi":"10.1109/PowerAfrica.2019.8928640","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928640","url":null,"abstract":"Electricity-access is a growing concern in developing countries of Sub-Saharan Africa where approximately 563million people (8% of the global population) lack electricity. Many use fossil-fuel generators and/or solar-home-systems (SHSs) with storage. Given the observed excess and unutilized electricity generated from these SHSs, a novel community peer-to-peer (P2P) electricity-market using automated negotiations is presented as a solution to improve access to electricity. Software agents representing World Bank Tiers 1 – 4 electricity-access households bilaterally negotiate electricity price and quantities applying five different negotiations heuristics. Simulation results show 65 – 100% trade of the excess generation; with Tiers 1 – 2 (low-income households) negotiating sufficient electricity (1 – 1.1kWh/day) at the least market-price of £0.35/kWh to move to Tier 3. Likewise, the Tier 3 household agent negotiated 1.5kWh/day sufficient to meet its needs. This novel electricitymarket model can help drive the United Nations goal of affordable, sustainable and modern energy for all by 2030.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"1 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":"129896093","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.2019.8928919
Zenachew Muluneh Hailemariam, R. Leidhold, G. T. Tesfamariam
This paper presents the real-time speed control of permanent magnet synchronous machine (PMSM) in a motoring mode for variable speed wind energy conversion system application. For this purpose, a discrete real-time laboratory test-rig is prepared using Permanent magnet synchronous servo motor, GUASCH Inverter and Texas instrument TMS320F28069 Digital Signal Processor (DSP) discrete real time microcontroller control card in a GUASCH board for implementing the designed PI current controller and PI speed controller. In addition, a simulation model of the system is prepared in MATLAB Simulink user-defined function blocks considering the dynamic mathematical equations of every part in the system. Finally, the achieved results of test-rig show that the system works very well for different transient speed changes. Moreover, it shows that the real-time time results validate the MATLAB simulation model results of the system.
{"title":"Real-Time Speed Control of a PMSM for Wind Turbine Application","authors":"Zenachew Muluneh Hailemariam, R. Leidhold, G. T. Tesfamariam","doi":"10.1109/PowerAfrica.2019.8928919","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928919","url":null,"abstract":"This paper presents the real-time speed control of permanent magnet synchronous machine (PMSM) in a motoring mode for variable speed wind energy conversion system application. For this purpose, a discrete real-time laboratory test-rig is prepared using Permanent magnet synchronous servo motor, GUASCH Inverter and Texas instrument TMS320F28069 Digital Signal Processor (DSP) discrete real time microcontroller control card in a GUASCH board for implementing the designed PI current controller and PI speed controller. In addition, a simulation model of the system is prepared in MATLAB Simulink user-defined function blocks considering the dynamic mathematical equations of every part in the system. Finally, the achieved results of test-rig show that the system works very well for different transient speed changes. Moreover, it shows that the real-time time results validate the MATLAB simulation model results of the system.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"478 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":"124246423","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.2019.8928871
F. Fameso, E. C. Egbulefu, J. Audu, O. Imoru
Africa is strategically positioned to reap massively from investing in harnessing its solar energy potentials. Research and development efforts are beginning to pave way for innovation, promotion and investments in inclusive, sustainable, clean and more efficient renewable energy sources such as solar energy which if well harnessed can provide up to 5000 TWH of cheap, readily available and renewable energy annually. This paper presents the design and development of a computerized duty-selector-controlled variable-duty solar-powered fluid pump which finds applications from small scale domestic, to heavy-duty industrial and agricultural purposes. It involves the fundamentals of design and construction of pumps, solar to electrical energy and software programming with C# programming language. The product was successfully built and pilot tested, pumping water from two storage tanks at ground level to a 10 metres high overhead tank with a capacity of 600 litres within 30 minutes.
{"title":"Design and Development of a Variable-Duty Solar-Powered Fluid Pump for Rural and Industrial Adaptation","authors":"F. Fameso, E. C. Egbulefu, J. Audu, O. Imoru","doi":"10.1109/PowerAfrica.2019.8928871","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928871","url":null,"abstract":"Africa is strategically positioned to reap massively from investing in harnessing its solar energy potentials. Research and development efforts are beginning to pave way for innovation, promotion and investments in inclusive, sustainable, clean and more efficient renewable energy sources such as solar energy which if well harnessed can provide up to 5000 TWH of cheap, readily available and renewable energy annually. This paper presents the design and development of a computerized duty-selector-controlled variable-duty solar-powered fluid pump which finds applications from small scale domestic, to heavy-duty industrial and agricultural purposes. It involves the fundamentals of design and construction of pumps, solar to electrical energy and software programming with C# programming language. The product was successfully built and pilot tested, pumping water from two storage tanks at ground level to a 10 metres high overhead tank with a capacity of 600 litres within 30 minutes.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"68 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":"121289883","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.2019.8928832
E. Ojo
The dynamic behaviour of Transmission line conductors is a subject of interest to power line designer. This phenomenon occurs as a result of the aerodynamic effects of vortex shedding that induces a transverse displacement. The behaviour of conductors when subjected to dynamic forces is not completely understood and this has necessitated the need for continuous investigations by researchers. Hence, various analytical, numerical and experimental models have evolved over the years to try and predict the concept of wind-induced vibration on power line conductors. This paper presents the developed analytical model that describes the dynamic response of conductors to the dynamic forces such a wind loading. The model presented, modelled the conductor as a continuous distributed parameters of a beam and this was used to evaluate the dynamic response of conductors. The conductor responses were obtained from the developed transfer function, implemented in a sweep manner to capture the resonance frequencies. A replica scenario of the sweep tests were conducted in the laboratory with the same loading conditions. To validate the model, the test results were compared with the developed analytical model. The comparison showed some degree of agreement.
{"title":"The Developed Analytical Model Used to Evaluate the Dynamic Behaviour of Power Line Conductors","authors":"E. Ojo","doi":"10.1109/PowerAfrica.2019.8928832","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928832","url":null,"abstract":"The dynamic behaviour of Transmission line conductors is a subject of interest to power line designer. This phenomenon occurs as a result of the aerodynamic effects of vortex shedding that induces a transverse displacement. The behaviour of conductors when subjected to dynamic forces is not completely understood and this has necessitated the need for continuous investigations by researchers. Hence, various analytical, numerical and experimental models have evolved over the years to try and predict the concept of wind-induced vibration on power line conductors. This paper presents the developed analytical model that describes the dynamic response of conductors to the dynamic forces such a wind loading. The model presented, modelled the conductor as a continuous distributed parameters of a beam and this was used to evaluate the dynamic response of conductors. The conductor responses were obtained from the developed transfer function, implemented in a sweep manner to capture the resonance frequencies. A replica scenario of the sweep tests were conducted in the laboratory with the same loading conditions. To validate the model, the test results were compared with the developed analytical model. The comparison showed some degree of agreement.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"86 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":"114760516","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.2019.8928841
Ekow Appiah Kwofie, Godfred Mensah, Vincent Safo Antwi
This paper summarizes the results of a post grid impact assessment of a Distributed Generated 20 MWp Solar PV plant on a 33-kV interconnection bus of a 161/33 kV substation within the Electricity Company of Ghana’s Limited distribution network located in the Gomoa Onyadze community in the Central Region of Ghana. The PV plant was commissioned since 2015. The paper assesses the impact of the PV plant in the following areas: The Demand Profile; Power Factor at the Point of Common Coupling (PCC); The Voltage Total Harmonic Distortion at the PCC; The Current Total Harmonic Distortion at the PCC; and the Voltage Profile at the PCC. The load profile was significantly distorted due to the active generation of the solar PV Plant. It now assumes a duck shape. The power factor at the 33 kV PCC bus deteriorated within the periods of active solar PV generation from 7:00 hours to 19:00 hours and went as low as 0.187 at noon time. The Voltage Total Harmonic Distortion (THD V) Levels at the 33 kV PCC bus where the solar PV Plant is interconnected, far exceeded the ECG allowable limits for THD V of 3%. The values were as high as 10%. The Current Total Harmonic Distortion (THD A) Levels at the 33 kV PCC bus of Transformer 1 far exceeded the limits of THD A of 5%. The values were as high as 65%. There was no significant impact on the voltage profile at the 33-kV bus where the solar PV plant was interconnected.
{"title":"Post Commission Grid Impact Assessment of a 20 MWp Solar PV Grid Connected System on the ECG 33 kV Network in Winneba","authors":"Ekow Appiah Kwofie, Godfred Mensah, Vincent Safo Antwi","doi":"10.1109/PowerAfrica.2019.8928841","DOIUrl":"https://doi.org/10.1109/PowerAfrica.2019.8928841","url":null,"abstract":"This paper summarizes the results of a post grid impact assessment of a Distributed Generated 20 MWp Solar PV plant on a 33-kV interconnection bus of a 161/33 kV substation within the Electricity Company of Ghana’s Limited distribution network located in the Gomoa Onyadze community in the Central Region of Ghana. The PV plant was commissioned since 2015. The paper assesses the impact of the PV plant in the following areas: The Demand Profile; Power Factor at the Point of Common Coupling (PCC); The Voltage Total Harmonic Distortion at the PCC; The Current Total Harmonic Distortion at the PCC; and the Voltage Profile at the PCC. The load profile was significantly distorted due to the active generation of the solar PV Plant. It now assumes a duck shape. The power factor at the 33 kV PCC bus deteriorated within the periods of active solar PV generation from 7:00 hours to 19:00 hours and went as low as 0.187 at noon time. The Voltage Total Harmonic Distortion (THD V) Levels at the 33 kV PCC bus where the solar PV Plant is interconnected, far exceeded the ECG allowable limits for THD V of 3%. The values were as high as 10%. The Current Total Harmonic Distortion (THD A) Levels at the 33 kV PCC bus of Transformer 1 far exceeded the limits of THD A of 5%. The values were as high as 65%. There was no significant impact on the voltage profile at the 33-kV bus where the solar PV plant was interconnected.","PeriodicalId":308661,"journal":{"name":"2019 IEEE PES/IAS PowerAfrica","volume":"56 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":"115959294","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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