Pub Date : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709457
Remmy Musumpuka, D. Dorrell
The escalation in power usage of green energy globally and the demand for green energy sources has necessitated the growth of distributed renewable energy generation in an effort to reduce greenhouse gas emissions. The ever increasing electricity tarriffs in South Africa has given rise to a rapid rollout of renewable energy and subsequently has led many household to self generate instead of relying on the power utility only. Solar is the most popular distributed renewable energy that is used by many households in South Africa. Solar energy generation pattern is highly predictable and has a high coincidence factor nearly 100% in a given small area. Because of high coincident factor of solar, low vltage (LV) networks are therefore prone to thermal overload and overvoltage in residential areas during the mid day. To avoid overloading and overvoltages on LV residential networks customers on shared transformer are limited to generate 25% of their individual load capacity as per statutory requirement in NRS097. Many of the household have installed renewable generators without complying to the 25% requirement and it is difficult for the utility to manual monitor all customers whether they comply or not. In this paper, we propose a smart switch that address this challenge and we outline the parameters to consider in relation to the NRS 097 as per grid codes in South Africa. This then enables us to devise a smart and automated interface between the renewable solar power generator and the public utility grid with the capability of having real-time intelligence to active/reactive power as well as the voltage produced by means of IEC 61850 communication protocol interface
{"title":"Smart Switch for Solar Renewable Sources at the Point of Common Coupling (PCC) in MV and LV Networks","authors":"Remmy Musumpuka, D. Dorrell","doi":"10.1109/SPEC52827.2021.9709457","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709457","url":null,"abstract":"The escalation in power usage of green energy globally and the demand for green energy sources has necessitated the growth of distributed renewable energy generation in an effort to reduce greenhouse gas emissions. The ever increasing electricity tarriffs in South Africa has given rise to a rapid rollout of renewable energy and subsequently has led many household to self generate instead of relying on the power utility only. Solar is the most popular distributed renewable energy that is used by many households in South Africa. Solar energy generation pattern is highly predictable and has a high coincidence factor nearly 100% in a given small area. Because of high coincident factor of solar, low vltage (LV) networks are therefore prone to thermal overload and overvoltage in residential areas during the mid day. To avoid overloading and overvoltages on LV residential networks customers on shared transformer are limited to generate 25% of their individual load capacity as per statutory requirement in NRS097. Many of the household have installed renewable generators without complying to the 25% requirement and it is difficult for the utility to manual monitor all customers whether they comply or not. In this paper, we propose a smart switch that address this challenge and we outline the parameters to consider in relation to the NRS 097 as per grid codes in South Africa. This then enables us to devise a smart and automated interface between the renewable solar power generator and the public utility grid with the capability of having real-time intelligence to active/reactive power as well as the voltage produced by means of IEC 61850 communication protocol interface","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133384749","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709442
Mebratu Delelegn, Ravikumar Hiremath, C. S. Reddy
The electric railway system represents one of the largest sources of unbalances in the three phase power system. As the traction load of electrified railway belongs to high- power nonlinear single-phase load, it will bring power quality problems such as harmonics and three-phase unbalance to the power system after being connected to the power grid. Therefore, it is necessary to evaluate the impact of the electrified railway operation under different conditions on the power quality of the system substation. In this paper a detail study of power flow analysis and an overview of the power quality for Addis-Djibouti railway line by taking Adegala and Hurso 230kV traction substation as case study is presented. The power flow analysis is done for determining the operation of existing system and also in planning the future expansion of the power system. A case study of modeling and simulation of the actual Adegala and Hurso 230kV traction substation were implemented with the Electrical transient analyzed programme (ETAP) software. Harmonic voltage and current calculations were made to determine whether the injected harmonic currents from the train loads caused unacceptable overvoltage at the point of common coupling (PCC). The simulation results showed that the total harmonic distortion (THD) of voltage is the highest at the point of the traction substation where the traction load is connected. The above mentioned harmonics in the THD are higher than the limits specified by IEEE standards 519-1992.The power flow analysis result shows that the bus voltages outside their specified limits of 95%-105%.Analysis for pre and post contingency event was carried out and the result shows that the system does not have enough redundancy to withstand any fault line voltage.
{"title":"Power Flow Analysis of Addis-Djibouti Railway Power Supply System Using ETAP","authors":"Mebratu Delelegn, Ravikumar Hiremath, C. S. Reddy","doi":"10.1109/SPEC52827.2021.9709442","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709442","url":null,"abstract":"The electric railway system represents one of the largest sources of unbalances in the three phase power system. As the traction load of electrified railway belongs to high- power nonlinear single-phase load, it will bring power quality problems such as harmonics and three-phase unbalance to the power system after being connected to the power grid. Therefore, it is necessary to evaluate the impact of the electrified railway operation under different conditions on the power quality of the system substation. In this paper a detail study of power flow analysis and an overview of the power quality for Addis-Djibouti railway line by taking Adegala and Hurso 230kV traction substation as case study is presented. The power flow analysis is done for determining the operation of existing system and also in planning the future expansion of the power system. A case study of modeling and simulation of the actual Adegala and Hurso 230kV traction substation were implemented with the Electrical transient analyzed programme (ETAP) software. Harmonic voltage and current calculations were made to determine whether the injected harmonic currents from the train loads caused unacceptable overvoltage at the point of common coupling (PCC). The simulation results showed that the total harmonic distortion (THD) of voltage is the highest at the point of the traction substation where the traction load is connected. The above mentioned harmonics in the THD are higher than the limits specified by IEEE standards 519-1992.The power flow analysis result shows that the bus voltages outside their specified limits of 95%-105%.Analysis for pre and post contingency event was carried out and the result shows that the system does not have enough redundancy to withstand any fault line voltage.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127297880","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709488
Lei Wang, W. Tian, U. Madawala, Jiangtao Yang
In vehicle-grid-home (VGH) systems, bidirectional wireless power transfer (BD-WPT) systems are gaining popularity, which offers considerable advantages in terms of safety and convenience. However, both nonlinear household appliances and EV charging system can easily cause the power quality problems such as low power factor, harmonic pollution, etc. A new versatile wireless vehicle-grid-home power interface (VW-VGH-PI) topology is proposed, comprising a power quality control converter (PQCC) between the grid and the wireless power transfer (WPT) system. New operating modes for a VW-VGH-PI are also proposed for active power interchange and reactive and harmonic power compensation. Based on the pre-designed capacity of PQCC, a selective power control method is proposed to limit the amount of active, reactive, and harmonic power passing through the PQCC for the heavy loads. In this paper, the structure, operation modes and selective power control are proposed for VW-VGH-PI. Simulation results are validating that the VW-VGH-PI can be used to selectively regulate the power flow among the vehiclegrid-home system.
{"title":"A Power Selective Control of Versatile Wireless Vehicle-Grid-Home Power Interface (VW-VGH-PI)","authors":"Lei Wang, W. Tian, U. Madawala, Jiangtao Yang","doi":"10.1109/SPEC52827.2021.9709488","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709488","url":null,"abstract":"In vehicle-grid-home (VGH) systems, bidirectional wireless power transfer (BD-WPT) systems are gaining popularity, which offers considerable advantages in terms of safety and convenience. However, both nonlinear household appliances and EV charging system can easily cause the power quality problems such as low power factor, harmonic pollution, etc. A new versatile wireless vehicle-grid-home power interface (VW-VGH-PI) topology is proposed, comprising a power quality control converter (PQCC) between the grid and the wireless power transfer (WPT) system. New operating modes for a VW-VGH-PI are also proposed for active power interchange and reactive and harmonic power compensation. Based on the pre-designed capacity of PQCC, a selective power control method is proposed to limit the amount of active, reactive, and harmonic power passing through the PQCC for the heavy loads. In this paper, the structure, operation modes and selective power control are proposed for VW-VGH-PI. Simulation results are validating that the VW-VGH-PI can be used to selectively regulate the power flow among the vehiclegrid-home system.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121091302","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709308
S. Alagab, S. Tennakoon
A study of a new bidirectional DC-DC converter based on the Marx concept suitable for high voltage application is carried out. The concept, principles of operation, and analysis led to the design equations. Which are used to determine the parameters of a 50MW DC to DC converter suitable for application to a wind farm DC power collection system. Both the steady-state and dynamic operation are investigated by simulation.
{"title":"Steady-state and dynamic performance of new bidirectional Marx DC-DC converter for wind power collection scheme","authors":"S. Alagab, S. Tennakoon","doi":"10.1109/SPEC52827.2021.9709308","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709308","url":null,"abstract":"A study of a new bidirectional DC-DC converter based on the Marx concept suitable for high voltage application is carried out. The concept, principles of operation, and analysis led to the design equations. Which are used to determine the parameters of a 50MW DC to DC converter suitable for application to a wind farm DC power collection system. Both the steady-state and dynamic operation are investigated by simulation.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134601571","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709477
Yuan Qiu, Yanbo Wang, Zhe Chen
This paper presents a modelling and stability analysis method for wind power plant with reactive power compensation (RPC) device considering parameter perturbation under long-term operation. The damage ratio of compensation capacitor is first modelled. Then, the state-space model of wind power plant with reactive power compensation capacitor is developed. Furthermore, the system stability considering parameters perturbation of compensation capacitor is investigated. Simulation results are given to validate the proposed model and stability analysis. The verification results show that attenuation and aging of compensation capacitors have an important impact on the stability of grid-connected inverter system. Therefore, the parameter variation of compensation capacitor should be considered during the stability assessment in practical application.
{"title":"Stability Analysis of Wind Power Plant with Reactive Power Compensation Device Considering Parameter Perturbation","authors":"Yuan Qiu, Yanbo Wang, Zhe Chen","doi":"10.1109/SPEC52827.2021.9709477","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709477","url":null,"abstract":"This paper presents a modelling and stability analysis method for wind power plant with reactive power compensation (RPC) device considering parameter perturbation under long-term operation. The damage ratio of compensation capacitor is first modelled. Then, the state-space model of wind power plant with reactive power compensation capacitor is developed. Furthermore, the system stability considering parameters perturbation of compensation capacitor is investigated. Simulation results are given to validate the proposed model and stability analysis. The verification results show that attenuation and aging of compensation capacitors have an important impact on the stability of grid-connected inverter system. Therefore, the parameter variation of compensation capacitor should be considered during the stability assessment in practical application.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133531061","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709447
Azmerawu Argawu Elende, M. G. Gebremichael
Distribution system is a part of an electric power system, which links the high voltage transmission networks with the end consumers. This work offers the way of improving the performance of the distribution network by improving voltage profile and reduction of power loss via injecting reactive power through the network. This study has been conducted on Aposto feeder of Yirgalem distribution network (Ethiopia) for steady-state constant load model. In this work, the first condition has aimed to find the best optimal D-STATCOM sizing and placement by using Teaching and Learning Based optimization (TLBO). Results obtained have been compared with those of the conventional optimization techniques reported in literature. As stated, the TLBO method performs better in terms of reducing both real and reactive power losses and improvement of voltage profile. The model has been formulated to minimize the total cost of the network by determining the optima of the substation locations and power, the load transfers between the demand centers, the feeder routes and the load flow in the network subject to a set of constraints. From the point of view of economic evaluations, the proposed approach is cost-effective. Generally, the simulation results show that the proposed technique is effective to maintain all bus voltage magnitudes within the IEEE acceptable limit and thereby reducing power losses significantly. In this research D-STATCOM control is developed based on artificial intelligence (AI) using artificial neural network (ANN), which depends on optimum values obtained by TLBO.
{"title":"Distribution Network Optimization by Optimal Sizing and Placement of D-STATCOM using Teaching and Learning Based Optimization Algorithm","authors":"Azmerawu Argawu Elende, M. G. Gebremichael","doi":"10.1109/SPEC52827.2021.9709447","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709447","url":null,"abstract":"Distribution system is a part of an electric power system, which links the high voltage transmission networks with the end consumers. This work offers the way of improving the performance of the distribution network by improving voltage profile and reduction of power loss via injecting reactive power through the network. This study has been conducted on Aposto feeder of Yirgalem distribution network (Ethiopia) for steady-state constant load model. In this work, the first condition has aimed to find the best optimal D-STATCOM sizing and placement by using Teaching and Learning Based optimization (TLBO). Results obtained have been compared with those of the conventional optimization techniques reported in literature. As stated, the TLBO method performs better in terms of reducing both real and reactive power losses and improvement of voltage profile. The model has been formulated to minimize the total cost of the network by determining the optima of the substation locations and power, the load transfers between the demand centers, the feeder routes and the load flow in the network subject to a set of constraints. From the point of view of economic evaluations, the proposed approach is cost-effective. Generally, the simulation results show that the proposed technique is effective to maintain all bus voltage magnitudes within the IEEE acceptable limit and thereby reducing power losses significantly. In this research D-STATCOM control is developed based on artificial intelligence (AI) using artificial neural network (ANN), which depends on optimum values obtained by TLBO.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114820389","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709453
E. Piedrahita-Echavarria, A. Escobar-Mejía, W. Gil-González
This paper presents a Model Predictive Control (MPC) algorithm applied to a Z-Source Inverter (ZSI), used in Wireless Power Transfer Systems (WPTs). The suggested control scheme is based on measurements of the ZSI capacitor voltage and the current load, to predict and tracking them in order to maintain the output voltage at the desired value. The modeling of the converter, along with the compensation circuit, the control scheme, and the PWM, are presented. Time-domain simulations are carried-out to validate the MPC-based scheme, which is compared with a Linear Quadratic Regulator (LQR).
{"title":"Model Predictive Control of a Z-Source Power Converter for Wireless Power Transfer Applications","authors":"E. Piedrahita-Echavarria, A. Escobar-Mejía, W. Gil-González","doi":"10.1109/SPEC52827.2021.9709453","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709453","url":null,"abstract":"This paper presents a Model Predictive Control (MPC) algorithm applied to a Z-Source Inverter (ZSI), used in Wireless Power Transfer Systems (WPTs). The suggested control scheme is based on measurements of the ZSI capacitor voltage and the current load, to predict and tracking them in order to maintain the output voltage at the desired value. The modeling of the converter, along with the compensation circuit, the control scheme, and the PWM, are presented. Time-domain simulations are carried-out to validate the MPC-based scheme, which is compared with a Linear Quadratic Regulator (LQR).","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121253920","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709484
M. Habyarimana, Remmy Musumpuka, D. Dorrell
Power loads can have high starting. These can be a serious source of concern in weak grids. This problem is envisaged to be exacerbated by the rollout of smart microgrids. When a high power induction motor is turned on, its inrush current drawn can be more than ten times the full-load current. This transient current can cause problems in weak grid connections. The increased current is due to both power required to start the load and the increased reactive power demand during the starting process. To protect the grid connection as well as the load, energy storage units can be used to compensate for the increased power requirement. A more pragmatic approach is to reduce the reactive power requirement using tuned compensation capacitors in order to reduce the inrush current. The aim of this work is to address the selection, calculation and switching of the capacitor bank for reactive power compensation. This first requires the study of the reactive power drawn by an induction motor during starting. The capacitances are calculated and switched on to compensate the starting transient and disconnected when the machine has run up to speed using a point-on switching approach that reduces the switching transient.
{"title":"Mitigating In-rush Currents for Induction Motor Loads","authors":"M. Habyarimana, Remmy Musumpuka, D. Dorrell","doi":"10.1109/SPEC52827.2021.9709484","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709484","url":null,"abstract":"Power loads can have high starting. These can be a serious source of concern in weak grids. This problem is envisaged to be exacerbated by the rollout of smart microgrids. When a high power induction motor is turned on, its inrush current drawn can be more than ten times the full-load current. This transient current can cause problems in weak grid connections. The increased current is due to both power required to start the load and the increased reactive power demand during the starting process. To protect the grid connection as well as the load, energy storage units can be used to compensate for the increased power requirement. A more pragmatic approach is to reduce the reactive power requirement using tuned compensation capacitors in order to reduce the inrush current. The aim of this work is to address the selection, calculation and switching of the capacitor bank for reactive power compensation. This first requires the study of the reactive power drawn by an induction motor during starting. The capacitances are calculated and switched on to compensate the starting transient and disconnected when the machine has run up to speed using a point-on switching approach that reduces the switching transient.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131525830","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709483
Y. P. Y. Deng, Jinjun Liu, Ronghui An, Zeng Liu
To facilitate needed active and reactive power flow between utility and microgrid, this research presents an enhanced power flow control of back-to-back interfacing converters between microgrid and utility. The system can operate to distribute real and reactive power equally between the utility and the microgrid based on the microgrid load power requirement. The open-loop power control proposed by Ritwik Majumder et al. relies on knowing the point of common coupling (PCC) voltage amplitude $(V_{P})$, angle $(delta_{P})$, and reactance $(X_{G})$. These parameters may not be available due to the considerable distance between the PCC bus and the back-to-back interfacing converters. These flaws are addressed in the method of control used in this paper. Besides, a harmonic compensation strategy is incorporated in the power control of a back-to-back interfacing converters to improve the microgrid PCC voltage quality, which has been deteriorated by nonlinear loads connected to the PCC bus. In microgrid DGs inverters, traditional droop control is used to provide power sharing for the remaining load demand. To lessen the voltage dip in the grid, a low-voltage grid support, also known as dynamic grid voltage support, is incorporated in the grid side converter of back-to-back converters. The grid voltage dip is reduced by the reactive power injection. The control techniques are verified using simulation in PSCAD software.
{"title":"Enhanced Control Strategy of Back-to-Back Interfacing Converters Between Microgrid and Utility","authors":"Y. P. Y. Deng, Jinjun Liu, Ronghui An, Zeng Liu","doi":"10.1109/SPEC52827.2021.9709483","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709483","url":null,"abstract":"To facilitate needed active and reactive power flow between utility and microgrid, this research presents an enhanced power flow control of back-to-back interfacing converters between microgrid and utility. The system can operate to distribute real and reactive power equally between the utility and the microgrid based on the microgrid load power requirement. The open-loop power control proposed by Ritwik Majumder et al. relies on knowing the point of common coupling (PCC) voltage amplitude $(V_{P})$, angle $(delta_{P})$, and reactance $(X_{G})$. These parameters may not be available due to the considerable distance between the PCC bus and the back-to-back interfacing converters. These flaws are addressed in the method of control used in this paper. Besides, a harmonic compensation strategy is incorporated in the power control of a back-to-back interfacing converters to improve the microgrid PCC voltage quality, which has been deteriorated by nonlinear loads connected to the PCC bus. In microgrid DGs inverters, traditional droop control is used to provide power sharing for the remaining load demand. To lessen the voltage dip in the grid, a low-voltage grid support, also known as dynamic grid voltage support, is incorporated in the grid side converter of back-to-back converters. The grid voltage dip is reduced by the reactive power injection. The control techniques are verified using simulation in PSCAD software.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128081704","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 : 2021-12-06DOI: 10.1109/SPEC52827.2021.9709438
J. Ehnberg, E. Hartvigsson, Isak Monrad-Aas
Electrification is a known precondition for development and is still lacking in rural and inaccessible parts of the world. Electric conversion of small coastal fishing boats can be an economical driver for small coastal villages in addition to providing environmental benefits. With local standalone solar photovoltaic mini-grids, the system can be fully renewable while still being economically viable. This study shows that such a system could be feasible to build in the Kelan village, Bali, Indonesia. Benefits of modern and smart grid technologies can further increase the economic and environmental benefits. It is also shown that if multiple fishing boat owners join forces to invest in Li-ion batteries the benefit of the even greater.
{"title":"Electrifying Fishing for Rural Electrification","authors":"J. Ehnberg, E. Hartvigsson, Isak Monrad-Aas","doi":"10.1109/SPEC52827.2021.9709438","DOIUrl":"https://doi.org/10.1109/SPEC52827.2021.9709438","url":null,"abstract":"Electrification is a known precondition for development and is still lacking in rural and inaccessible parts of the world. Electric conversion of small coastal fishing boats can be an economical driver for small coastal villages in addition to providing environmental benefits. With local standalone solar photovoltaic mini-grids, the system can be fully renewable while still being economically viable. This study shows that such a system could be feasible to build in the Kelan village, Bali, Indonesia. Benefits of modern and smart grid technologies can further increase the economic and environmental benefits. It is also shown that if multiple fishing boat owners join forces to invest in Li-ion batteries the benefit of the even greater.","PeriodicalId":236251,"journal":{"name":"2021 IEEE Southern Power Electronics Conference (SPEC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131949148","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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