Pub Date : 2018-10-01DOI: 10.1109/EPEC.2018.8598406
S. Dibaj, Leila Sharifi, A. Miri, Jing Zhou, A. Aram
We are surrounded by state-of-the-art technologies that have drastically changed and continue to change our lives at a fast pace. To overcome the modern-day challenges in cloud services, it is important to have a proper business model and a fair pricing mechanism, which are as important as the technological developments being offered. Based on the similarities between the concept of cloud infrastructure and Smart Cities, we can say that the cloud environment is the lower layer in any Smart City architecture, and any improvement in the cloud pricing mechanism and cloud sustainability can be modeled and used in the Smart City concept. This paper will discuss the similarities between the cloud infrastructures and Smart Cities, as well as their respective business models. Furthermore, this paper provides a comprehensive survey of the cloud pricing mechanisms and the challenges that it deals with, to shed light on the potentiality of improving the sustainability and pricing mechanisms on the cloud or any similar state-of-the-art technologies.
{"title":"Cloud Computing Energy Efficiency and Fair Pricing Mechanisms for Smart Cities","authors":"S. Dibaj, Leila Sharifi, A. Miri, Jing Zhou, A. Aram","doi":"10.1109/EPEC.2018.8598406","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598406","url":null,"abstract":"We are surrounded by state-of-the-art technologies that have drastically changed and continue to change our lives at a fast pace. To overcome the modern-day challenges in cloud services, it is important to have a proper business model and a fair pricing mechanism, which are as important as the technological developments being offered. Based on the similarities between the concept of cloud infrastructure and Smart Cities, we can say that the cloud environment is the lower layer in any Smart City architecture, and any improvement in the cloud pricing mechanism and cloud sustainability can be modeled and used in the Smart City concept. This paper will discuss the similarities between the cloud infrastructures and Smart Cities, as well as their respective business models. Furthermore, this paper provides a comprehensive survey of the cloud pricing mechanisms and the challenges that it deals with, to shed light on the potentiality of improving the sustainability and pricing mechanisms on the cloud or any similar state-of-the-art technologies.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"3 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132982510","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598403
Soleiman Rahmani, A. Rezaei-Zare
Considerable penetration of distributed generation (DG) in power systems has opened an option of operating DGs in islanded mode for economic and technical reasons. However, maintaining voltage and frequency in the allowable range, as two main symptoms for proper performance of a power network, is a crucial challenge in islanded inverter-based microgrids (IBMG). In the event of severe contingencies, load shedding (LS) can be the last solution which recovers the voltage and frequency of the system. This study introduces an under voltage-frequency LS (UVFLS) scheme to achieve proper load shedding amounts (LSAs). In this paper, state-space model of IBMG and a fast time-step simulation approach, based on the complete state-space model of IBMG has been equipped, in order to obtain responses of the system. A precise method for calculating P-V curves according to loads PF is presented to derive the optimum LSA. Simulation studies are carried out on a test IBMG in presence using MATLAB software to validate the proper performance of proposed voltage and frequency recovery method.
{"title":"Under Voltage-Frequency Load Shedding in an Islanded Inverter-based Microgrid using Power Factor-based P-V curves","authors":"Soleiman Rahmani, A. Rezaei-Zare","doi":"10.1109/EPEC.2018.8598403","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598403","url":null,"abstract":"Considerable penetration of distributed generation (DG) in power systems has opened an option of operating DGs in islanded mode for economic and technical reasons. However, maintaining voltage and frequency in the allowable range, as two main symptoms for proper performance of a power network, is a crucial challenge in islanded inverter-based microgrids (IBMG). In the event of severe contingencies, load shedding (LS) can be the last solution which recovers the voltage and frequency of the system. This study introduces an under voltage-frequency LS (UVFLS) scheme to achieve proper load shedding amounts (LSAs). In this paper, state-space model of IBMG and a fast time-step simulation approach, based on the complete state-space model of IBMG has been equipped, in order to obtain responses of the system. A precise method for calculating P-V curves according to loads PF is presented to derive the optimum LSA. Simulation studies are carried out on a test IBMG in presence using MATLAB software to validate the proper performance of proposed voltage and frequency recovery method.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126478422","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598401
Dimas Aji Nugraha, K. Lian, Suwarno
Cuckoo Search (CS) is a new optimization algorithm based on meta-heuristic (MH) approach. It has been used to solve optimization problem in many applications including Maximum Power Point Tracking (MPPT) problem. MH based algorithm is usually deployed to encounter a multiple peak problem in partially shaded centralized Photovoltaic (PV) system. CS algorithm performs a good result in tracking the Global Maximum Power Point (GMPP) compared to other MH based algorithms. However it still requires a relatively long tracking time to locate the Global Maximum Power Point (GMPP). This paper proposes a new MPPT algorithm by combining CS algorithm with Golden Section Search (GSS) algorithm to cultivate beneficial features from both algorithms. To validate the proposed algorithm, it will be evaluated by using various cases of partial shading. The result shows a noticeable performance improvement compared to original CS algorithm and other MH algorithm.
{"title":"A Novel MPPT Method Based on Cuckoo Search Algorithm and Golden Section Search Algorithm for Partially Shaded PV System","authors":"Dimas Aji Nugraha, K. Lian, Suwarno","doi":"10.1109/EPEC.2018.8598401","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598401","url":null,"abstract":"Cuckoo Search (CS) is a new optimization algorithm based on meta-heuristic (MH) approach. It has been used to solve optimization problem in many applications including Maximum Power Point Tracking (MPPT) problem. MH based algorithm is usually deployed to encounter a multiple peak problem in partially shaded centralized Photovoltaic (PV) system. CS algorithm performs a good result in tracking the Global Maximum Power Point (GMPP) compared to other MH based algorithms. However it still requires a relatively long tracking time to locate the Global Maximum Power Point (GMPP). This paper proposes a new MPPT algorithm by combining CS algorithm with Golden Section Search (GSS) algorithm to cultivate beneficial features from both algorithms. To validate the proposed algorithm, it will be evaluated by using various cases of partial shading. The result shows a noticeable performance improvement compared to original CS algorithm and other MH algorithm.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126058626","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598354
A. Yazdavar, M. Azzouz, E. El-Saadany
This paper presents a comprehensive design procedure for the supply side of a stand-alone photovoltaic-based electric vehicle parking lot. For this isolated system, a photovoltaic (PV) array installed at the parking roof is in charge for power supply. Also, a battery bank as a storage system is dedicated to ensure the service continuity. A step down DC/DC converter is providing the required voltage to harvest the maximum available power of the PV array. This converter is fed by the main system DC bus. Another bidirectional DC/DC converter is responsible to maintain the suitable voltage profile at the DC bus, in addition to the battery charging. The last stage of the supply is a voltage source converter (VSC) that is fed by the main DC Bus. All three converters are designed and modelled. Further, the appropriate controller for each converter is suggested. Considering the importance of the VSC output filter, an efficient algorithm for filter design is proposed that offers better trade-off between filtering and damping. Also, a controller is suggested for bidirectional buck-boost converter that guarantees its stable operation for sudden change of PV supply and load, for the whole operating region. The effectiveness of the proposed design procedure is validated through time-domain simulations.
{"title":"Design, Modeling and Simulation for Stand-Alone Electric Vehicle Parking Lots Fed by Photovoltaic Systems","authors":"A. Yazdavar, M. Azzouz, E. El-Saadany","doi":"10.1109/EPEC.2018.8598354","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598354","url":null,"abstract":"This paper presents a comprehensive design procedure for the supply side of a stand-alone photovoltaic-based electric vehicle parking lot. For this isolated system, a photovoltaic (PV) array installed at the parking roof is in charge for power supply. Also, a battery bank as a storage system is dedicated to ensure the service continuity. A step down DC/DC converter is providing the required voltage to harvest the maximum available power of the PV array. This converter is fed by the main system DC bus. Another bidirectional DC/DC converter is responsible to maintain the suitable voltage profile at the DC bus, in addition to the battery charging. The last stage of the supply is a voltage source converter (VSC) that is fed by the main DC Bus. All three converters are designed and modelled. Further, the appropriate controller for each converter is suggested. Considering the importance of the VSC output filter, an efficient algorithm for filter design is proposed that offers better trade-off between filtering and damping. Also, a controller is suggested for bidirectional buck-boost converter that guarantees its stable operation for sudden change of PV supply and load, for the whole operating region. The effectiveness of the proposed design procedure is validated through time-domain simulations.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131212951","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598363
Muamer M. Shebani, Tarirq Iqbal, J. Quaicoe
For load current sharing between parallel-connected DC-DC boost converters, a modified droop method with varying cable resistance is presented in this paper. The droop method provides a suitable current sharing in the system because there is no intercommunication link between the parallel-connected modules. However, when the cable resistance is considered, a small mismatch in output voltage of parallel-connected converters leads to circulating current and unequal load current sharing between two modules. To resolve this issue without using a communication link between modules, the modified droop method based on cable resistance implementation is proposed to improve the load current sharing. This can be established by adjusting the output voltage for each converter of the parallel-connected converters individually and according to modified load regulation characteristic of the droop method. The effectiveness of the proposed method is demonstrated using Matlab/Simulink simulations.
{"title":"An Implementation of Cable Resistance in Modified Droop Control Method for Parallel-connected DC-DC Boost Converters","authors":"Muamer M. Shebani, Tarirq Iqbal, J. Quaicoe","doi":"10.1109/EPEC.2018.8598363","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598363","url":null,"abstract":"For load current sharing between parallel-connected DC-DC boost converters, a modified droop method with varying cable resistance is presented in this paper. The droop method provides a suitable current sharing in the system because there is no intercommunication link between the parallel-connected modules. However, when the cable resistance is considered, a small mismatch in output voltage of parallel-connected converters leads to circulating current and unequal load current sharing between two modules. To resolve this issue without using a communication link between modules, the modified droop method based on cable resistance implementation is proposed to improve the load current sharing. This can be established by adjusting the output voltage for each converter of the parallel-connected converters individually and according to modified load regulation characteristic of the droop method. The effectiveness of the proposed method is demonstrated using Matlab/Simulink simulations.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127598806","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598337
T. Kawasaki, S. Obara, Y. Uemura
This research aims at the development of a power generation system with low environmental load using the dissociation and expansion characteristics of CO2hydrate. The proposed power generation system drives the actuator by making use of large pressure difference in the generation and dissociation reaction of CO2hydrate caused by small temperature difference of several tens of degrees. In this study, CO2hydrate generation and dissociation tests are carried out using reaction vessels with different thermal conductivity, and the C02 hydrate generation characteristics are compared by examining the CO2hydrate generation amounts. In addition, an increase in the power generation amount of the proposed system is analyzed. Experiments were conducted to examine the production experiment of CO2hydrate to measure the amount of CO2hydrate production and experiments simulating the proposed system using reaction vessels and buffer tanks. A stainless steel cylindrical device (thermal conductivity 20.9 W/(m·K)) and a copper cylindrical device (thermal conductivity 402 W/(m·K)) were used for the reaction vessel. By using two reaction vessels, we investigate the amount of CO2hydrate produced and the efficiency of dissociation due to the difference in thermal conductivity. As a result of the survey, it was confirmed that increasing the thermal conductivity of the reaction vessel increases the CO2hydrate production by about 67% and the CO2 hydrate dissociation efficiency increases by about 1 %. Therefore, as one method to increase the power generation amount of the proposed power generation system, it is possible to increase the thermal conductivity of the reaction vessel.
{"title":"Investigation of CO2hydrate generation characteristics based on the development of a power generation system using atmospheric heat","authors":"T. Kawasaki, S. Obara, Y. Uemura","doi":"10.1109/EPEC.2018.8598337","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598337","url":null,"abstract":"This research aims at the development of a power generation system with low environmental load using the dissociation and expansion characteristics of CO2hydrate. The proposed power generation system drives the actuator by making use of large pressure difference in the generation and dissociation reaction of CO2hydrate caused by small temperature difference of several tens of degrees. In this study, CO2hydrate generation and dissociation tests are carried out using reaction vessels with different thermal conductivity, and the C02 hydrate generation characteristics are compared by examining the CO2hydrate generation amounts. In addition, an increase in the power generation amount of the proposed system is analyzed. Experiments were conducted to examine the production experiment of CO2hydrate to measure the amount of CO2hydrate production and experiments simulating the proposed system using reaction vessels and buffer tanks. A stainless steel cylindrical device (thermal conductivity 20.9 W/(m·K)) and a copper cylindrical device (thermal conductivity 402 W/(m·K)) were used for the reaction vessel. By using two reaction vessels, we investigate the amount of CO2hydrate produced and the efficiency of dissociation due to the difference in thermal conductivity. As a result of the survey, it was confirmed that increasing the thermal conductivity of the reaction vessel increases the CO2hydrate production by about 67% and the CO2 hydrate dissociation efficiency increases by about 1 %. Therefore, as one method to increase the power generation amount of the proposed power generation system, it is possible to increase the thermal conductivity of the reaction vessel.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134343263","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598280
H. Bayat, A. Yazdani
Application of modular multilevel converter (MMC) for grid integration of photovoltaic (PV) generators has gained much attention lately. This paper proposes a modified power mismatch elimination strategy for an MMC-based PV system. Although the existing power mismatch elimination strategy based on internal power flow of the MMC is capable of eliminating power mismatches in a perfectly balanced power system, it will fail to do so if the grid voltage is unbalanced at point of common coupling (PCC). The proposed modified power mismatch elimination strategy, utilizes the internal power flow of the MMC-based PV system to ensure that the converter leg connected to grid phase with higher voltage delivers higher power to the grid and the leg connected to the phase with lower voltage delivers less power to the grid. As a result, the currents delivered to the host grid become balanced and symmetrical in spite of existing power mismatches and unbalanced grid voltage. The effectiveness of the proposed modified power mismatch elimination strategy is demonstrated by time-domain simulations conducted on a model of the PV system in PSCAD/EMTDC software environment.
{"title":"A Power Mismatch Elimination Strategy for an MMC-based PV System in Unbalanced Grids","authors":"H. Bayat, A. Yazdani","doi":"10.1109/EPEC.2018.8598280","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598280","url":null,"abstract":"Application of modular multilevel converter (MMC) for grid integration of photovoltaic (PV) generators has gained much attention lately. This paper proposes a modified power mismatch elimination strategy for an MMC-based PV system. Although the existing power mismatch elimination strategy based on internal power flow of the MMC is capable of eliminating power mismatches in a perfectly balanced power system, it will fail to do so if the grid voltage is unbalanced at point of common coupling (PCC). The proposed modified power mismatch elimination strategy, utilizes the internal power flow of the MMC-based PV system to ensure that the converter leg connected to grid phase with higher voltage delivers higher power to the grid and the leg connected to the phase with lower voltage delivers less power to the grid. As a result, the currents delivered to the host grid become balanced and symmetrical in spite of existing power mismatches and unbalanced grid voltage. The effectiveness of the proposed modified power mismatch elimination strategy is demonstrated by time-domain simulations conducted on a model of the PV system in PSCAD/EMTDC software environment.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114139066","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598443
Y. Ounejjar, Ayoub El Gadari, M. Abarzadeh, K. Al-haddad
In this paper, a novel PWM technique insuring the self-balancing of the capacitors voltages has been proposed for the attained nine-level packed $mathbf{U}$ cells (PUC) converter. In the traditional fifteen-level operation, the capacitors voltages have to be maintained around their references using a state variable feedback which requires three sensors, two for the capacitors voltages and one for the load current. By applying the proposed PWM technique to the fifteen-level PUC converter, self-balancing of the capacitors voltages is attained, which results in the proposed nine-level converter. The proposed balancing technique is achieved without any closed loop regulation or sensors. The proposed concept has been verified by mean of simulations performed in the Matlab Simulink environments. Simulation results show that even under severe DC bus voltage and load parameters variations, the capacitors voltages remains around their required values. Harmonics contents of load current depend on the modulating signal frequency. Moreover, even under low frequencies, the total harmonics distortion remains reduced.
{"title":"PWM Sensor-less Balancing Technique for the Fifteen-Level PUC Converter","authors":"Y. Ounejjar, Ayoub El Gadari, M. Abarzadeh, K. Al-haddad","doi":"10.1109/EPEC.2018.8598443","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598443","url":null,"abstract":"In this paper, a novel PWM technique insuring the self-balancing of the capacitors voltages has been proposed for the attained nine-level packed $mathbf{U}$ cells (PUC) converter. In the traditional fifteen-level operation, the capacitors voltages have to be maintained around their references using a state variable feedback which requires three sensors, two for the capacitors voltages and one for the load current. By applying the proposed PWM technique to the fifteen-level PUC converter, self-balancing of the capacitors voltages is attained, which results in the proposed nine-level converter. The proposed balancing technique is achieved without any closed loop regulation or sensors. The proposed concept has been verified by mean of simulations performed in the Matlab Simulink environments. Simulation results show that even under severe DC bus voltage and load parameters variations, the capacitors voltages remains around their required values. Harmonics contents of load current depend on the modulating signal frequency. Moreover, even under low frequencies, the total harmonics distortion remains reduced.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129560048","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598416
Mohammad. Y. Ali, Faizan Khan, V. Sood
An Energy Management System (EMS) is required to control the flow of power and match generation with the load within a microgrid during grid-connected and islanded modes of operation. An optimisation algorithm is needed to minimise the cost of the energy drawn from the grid, generated within the grid and consumed by the loads. In this paper, an optimisation algorithm based on Particle Swarm Optimisation (PSO) algorithm is used. Case studies with grid-connected and islanded modes of operation demonstrate the effectiveness of the optimisation algorithm. Also, since the EMS Control Centre is normally at a remote location from the microgrid, a communication system is needed to exchange information between the Master Controller of the EMS Control Centre and the Local Controllers of the various generators. A low-cost communication system has been developed to demonstrate the feasibility of the communication channel required between the Master Controller and the Local Controllers.
{"title":"Energy Management System of a Microgrid using Particle Swarm Optimization and Wireless Communication System","authors":"Mohammad. Y. Ali, Faizan Khan, V. Sood","doi":"10.1109/EPEC.2018.8598416","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598416","url":null,"abstract":"An Energy Management System (EMS) is required to control the flow of power and match generation with the load within a microgrid during grid-connected and islanded modes of operation. An optimisation algorithm is needed to minimise the cost of the energy drawn from the grid, generated within the grid and consumed by the loads. In this paper, an optimisation algorithm based on Particle Swarm Optimisation (PSO) algorithm is used. Case studies with grid-connected and islanded modes of operation demonstrate the effectiveness of the optimisation algorithm. Also, since the EMS Control Centre is normally at a remote location from the microgrid, a communication system is needed to exchange information between the Master Controller of the EMS Control Centre and the Local Controllers of the various generators. A low-cost communication system has been developed to demonstrate the feasibility of the communication channel required between the Master Controller and the Local Controllers.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126016292","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 : 2018-10-01DOI: 10.1109/EPEC.2018.8598411
A. Petean-Pina, C. Opathella, B. Venkatesh
Transmission systems worldwide were designed predominantly for operation with conventional synchronous generation but are now evolving to include the integration of large amounts of renewable generation. These generators are sited at resource-rich locations, causing a geographical shift in power injections into transmission systems, in some cases, subjecting them to undue stress. In many transmission systems, the capacity to integrate wind resources has been exhausted. In these circumstances, assessing the effect of the uncertainty inherent in wind forecasts with respect to system voltage stability is very important. This paper proposes a method for providing such an assessment. Using an optimal power flow algorithm, a Hessian matrix of the power balance equations is determined, which linearly relates changes in the minimum singular value of the system Jacobian to changes in bus-wise real power injections. This relationship is then employed for examining the effect of the uncertainty in the wind power forecast with respect to system voltage stability. The proposed method has been applied for studying these effects in IEEE 6-bus, 57-bus, and 118-bus systems. The same systems were also investigated using the minimum singular values of the system Jacobian matrix. The comparison of results from two methods demonstrates the effectiveness of the proposed technique.
{"title":"Effect of Wind Generation Uncertainty on Voltage Stability - A Singular Value Analysis","authors":"A. Petean-Pina, C. Opathella, B. Venkatesh","doi":"10.1109/EPEC.2018.8598411","DOIUrl":"https://doi.org/10.1109/EPEC.2018.8598411","url":null,"abstract":"Transmission systems worldwide were designed predominantly for operation with conventional synchronous generation but are now evolving to include the integration of large amounts of renewable generation. These generators are sited at resource-rich locations, causing a geographical shift in power injections into transmission systems, in some cases, subjecting them to undue stress. In many transmission systems, the capacity to integrate wind resources has been exhausted. In these circumstances, assessing the effect of the uncertainty inherent in wind forecasts with respect to system voltage stability is very important. This paper proposes a method for providing such an assessment. Using an optimal power flow algorithm, a Hessian matrix of the power balance equations is determined, which linearly relates changes in the minimum singular value of the system Jacobian to changes in bus-wise real power injections. This relationship is then employed for examining the effect of the uncertainty in the wind power forecast with respect to system voltage stability. The proposed method has been applied for studying these effects in IEEE 6-bus, 57-bus, and 118-bus systems. The same systems were also investigated using the minimum singular values of the system Jacobian matrix. The comparison of results from two methods demonstrates the effectiveness of the proposed technique.","PeriodicalId":265297,"journal":{"name":"2018 IEEE Electrical Power and Energy Conference (EPEC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125358512","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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