Pub Date : 2014-04-24DOI: 10.1109/PECI.2014.6804558
M. Aleenejad, R. Ahmadi, Parvin Moamaei
This paper presents a novel switching strategy based on Selective Harmonic Elimination (SHE) for the fault-tolerant operation of multilevel cascaded H-bridge (CHB) inverters. In this paper, first the structure and operation of a 7-level CHB is reviewed and the general SHE concept for this type of inverter is studied briefly. Then, the proposed fault-tolerant switching strategy for a CHB with one faulty switch is presented. Finally, simulation results are provided to validate the proposed modulation technique.
{"title":"A modified selective harmonic elimination method for fault-tolerant operation of multilevel cascaded H-bridge inverters","authors":"M. Aleenejad, R. Ahmadi, Parvin Moamaei","doi":"10.1109/PECI.2014.6804558","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804558","url":null,"abstract":"This paper presents a novel switching strategy based on Selective Harmonic Elimination (SHE) for the fault-tolerant operation of multilevel cascaded H-bridge (CHB) inverters. In this paper, first the structure and operation of a 7-level CHB is reviewed and the general SHE concept for this type of inverter is studied briefly. Then, the proposed fault-tolerant switching strategy for a CHB with one faulty switch is presented. Finally, simulation results are provided to validate the proposed modulation technique.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133044215","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804544
Katherine A. Kim, N. Dostart, J. Huynh, P. Krein
Multi-junction solar cells are commonly used in space applications where they are exposed to the air mass 0 (AM0) spectrum. Solar simulators are used to emulate the AM0 spectrum for ground testing of the solar cells before the space application is launched. A low-cost solar simulator was designed using LEDs for the visible spectrum and halogen lamps for the infrared spectrum. A design procedure is provided to determine the intensity and geometry of the lights needed to meet spectral match and spatial uniformity requirements. The presented solar simulator design is adequate for testing GaInP2/GaAs/Ge triple-junction solar cells intended for use in a cube satellite application and has a significantly lower cost than commercially-available solar simulators.
{"title":"Low-cost solar simulator design for multi-junction solar cells in space applications","authors":"Katherine A. Kim, N. Dostart, J. Huynh, P. Krein","doi":"10.1109/PECI.2014.6804544","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804544","url":null,"abstract":"Multi-junction solar cells are commonly used in space applications where they are exposed to the air mass 0 (AM0) spectrum. Solar simulators are used to emulate the AM0 spectrum for ground testing of the solar cells before the space application is launched. A low-cost solar simulator was designed using LEDs for the visible spectrum and halogen lamps for the infrared spectrum. A design procedure is provided to determine the intensity and geometry of the lights needed to meet spectral match and spatial uniformity requirements. The presented solar simulator design is adequate for testing GaInP2/GaAs/Ge triple-junction solar cells intended for use in a cube satellite application and has a significantly lower cost than commercially-available solar simulators.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131981492","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804566
Matthew J Harvey, Daniela Long, K. Reinhard
The National Institute of Standards and Technology Interagency Report (NISITR) 7628, Guidelines for Smart Grid Cyber Security, provides an analytical framework that stakeholders can use to develop effective Smart Grid related characteristics, risks, and vulnerabilities. NISTIR 7628 spans more than 600 pages and is densely packed with technical information drawn from multiple disciplines, which to many readers is difficult to broadly conceptualize and apply. This paper explores methods for visualizing the complexities of NISTIR 7628's cyber security guidelines for the nascent Smart Grid and aiding readers to better synthesize the information presented.
{"title":"Visualizing NISTIR 7628, Guidelines for Smart Grid Cyber Security","authors":"Matthew J Harvey, Daniela Long, K. Reinhard","doi":"10.1109/PECI.2014.6804566","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804566","url":null,"abstract":"The National Institute of Standards and Technology Interagency Report (NISITR) 7628, Guidelines for Smart Grid Cyber Security, provides an analytical framework that stakeholders can use to develop effective Smart Grid related characteristics, risks, and vulnerabilities. NISTIR 7628 spans more than 600 pages and is densely packed with technical information drawn from multiple disciplines, which to many readers is difficult to broadly conceptualize and apply. This paper explores methods for visualizing the complexities of NISTIR 7628's cyber security guidelines for the nascent Smart Grid and aiding readers to better synthesize the information presented.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134431296","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804572
Saeed Mohajeryami, Z. Salami, I. N. Moghaddam
The Under Excitation Limiter (UEL) has been introduced in the excitation systems mostly to prevent the loss of synchronism of generators and also prevent exceeding machine under-excited capability limit which otherwise leads to overheating of the stator of the machine and also challenges different part of generator protection and control system. In this paper, its effect on the modeling of Diesel Generator's excitation system during island operation (i.e. local network) is studied. The simulation results performed in the Matlab/Simulink using IEEE type ST2A excitation model suggests that in the local network with mainly inductive loads the UEL is ineffective and it can be neglected in the modeling.
{"title":"Study of effectiveness of under-excitation limiter in dynamic modeling of Diesel Generators","authors":"Saeed Mohajeryami, Z. Salami, I. N. Moghaddam","doi":"10.1109/PECI.2014.6804572","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804572","url":null,"abstract":"The Under Excitation Limiter (UEL) has been introduced in the excitation systems mostly to prevent the loss of synchronism of generators and also prevent exceeding machine under-excited capability limit which otherwise leads to overheating of the stator of the machine and also challenges different part of generator protection and control system. In this paper, its effect on the modeling of Diesel Generator's excitation system during island operation (i.e. local network) is studied. The simulation results performed in the Matlab/Simulink using IEEE type ST2A excitation model suggests that in the local network with mainly inductive loads the UEL is ineffective and it can be neglected in the modeling.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117287245","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804576
D. Phillips, T. Overbye
Wide-Area Measurement Systems (WAMS) are being implemented in order to help increase situational awareness within the electric grid. These systems use Phasor Measurement Units (PMUs), devices which can measure the voltage and current within the power system. One kind of PMU is the Frequency Disturbance Recorder (FDR), which measures voltage magnitude, frequency, and phase angle at 10 data samples per second. These measurements are taken at the 120V level, resulting in a relatively low-cost, rapidly deployable alternative to other PMUs. This paper presents an approach to distribution system event detection and classification using voltage data obtained from FDRs installed around the University of Illinois at Urbana-Champaign (UIUC). This model-free classification of events will use pattern recognition techniques to help identify features that may be unique to these disturbances. Analysis will be applied to a sliding window of voltage data, and the results from each window are compared against one another in order to help determine what kind of event occurred.
{"title":"Distribution system event detection and classification using local voltage measurements","authors":"D. Phillips, T. Overbye","doi":"10.1109/PECI.2014.6804576","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804576","url":null,"abstract":"Wide-Area Measurement Systems (WAMS) are being implemented in order to help increase situational awareness within the electric grid. These systems use Phasor Measurement Units (PMUs), devices which can measure the voltage and current within the power system. One kind of PMU is the Frequency Disturbance Recorder (FDR), which measures voltage magnitude, frequency, and phase angle at 10 data samples per second. These measurements are taken at the 120V level, resulting in a relatively low-cost, rapidly deployable alternative to other PMUs. This paper presents an approach to distribution system event detection and classification using voltage data obtained from FDRs installed around the University of Illinois at Urbana-Champaign (UIUC). This model-free classification of events will use pattern recognition techniques to help identify features that may be unique to these disturbances. Analysis will be applied to a sliding window of voltage data, and the results from each window are compared against one another in order to help determine what kind of event occurred.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131156677","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804552
Kaitlyn J. Bunker, W. Weaver
This paper implements optimal control strategies in the scenario of a battery energy storage system connected to the electric grid together with a wind turbine. A simplified model for a battery is first developed, along with a state equation model of the system. Optimal control is used to minimize the difference between the actual battery power and the given reference power. The battery is connected to the grid through a buck converter, and the optimal control solution is used to calculate the necessary duty cycle to achieve the desired results. Inequality constraints are added to ensure that the simulation is a realistic model of the behavior of a battery. The control strategy is also demonstrated experimentally with a battery and sample grid system.
{"title":"Optimization of grid-connected wind and battery energy storage system","authors":"Kaitlyn J. Bunker, W. Weaver","doi":"10.1109/PECI.2014.6804552","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804552","url":null,"abstract":"This paper implements optimal control strategies in the scenario of a battery energy storage system connected to the electric grid together with a wind turbine. A simplified model for a battery is first developed, along with a state equation model of the system. Optimal control is used to minimize the difference between the actual battery power and the given reference power. The battery is connected to the grid through a buck converter, and the optimal control solution is used to calculate the necessary duty cycle to achieve the desired results. Inequality constraints are added to ensure that the simulation is a realistic model of the behavior of a battery. The control strategy is also demonstrated experimentally with a battery and sample grid system.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125545197","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804569
D. Sudha Rani, N. Subrahmanyam, M. Sydulu
Distribution network reconfiguration is a complex combinatorial optimization process aimed at finding a radial operating structure that minimizes the system power loss, deviation of node voltages and service restoration while satisfying operating constraints. In this paper, a Self Adaptive Harmony Search algorithm (SAHSA) is proposed to solve the network reconfiguration problem in order to minimize the active and reactive power loss. SAHSA uses a stochastic search and local search instead of a gradient search. Forward and Backward Substitution Power Flow method is used to solve the radial distribution system. The proposed approach is tested on standard IEEE 33-bus and 69-bus radial distribution systems. The results are compared with Music Based Harmony Search Algorithm (MBHSA) and it is observed that the proposed method performed well in terms of the quality of solution.
配电网重构是一个复杂的组合优化过程，其目标是在满足运行约束的前提下，寻找一种使系统功率损耗、节点电压偏差和业务恢复最小化的径向运行结构。本文提出了一种自适应和谐搜索算法(SAHSA)来解决电网重构问题，使有功和无功损耗最小。SAHSA使用随机搜索和局部搜索代替梯度搜索。采用正向和反向替代潮流法求解径向配电系统。该方法在标准的IEEE 33总线和69总线径向配电系统上进行了测试。将结果与基于音乐的和声搜索算法(Music Based Harmony Search Algorithm, MBHSA)进行了比较，结果表明所提方法在解的质量方面表现良好。
{"title":"Self Adaptive Harmony Search algorithm for Optimal Network Reconfiguration","authors":"D. Sudha Rani, N. Subrahmanyam, M. Sydulu","doi":"10.1109/PECI.2014.6804569","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804569","url":null,"abstract":"Distribution network reconfiguration is a complex combinatorial optimization process aimed at finding a radial operating structure that minimizes the system power loss, deviation of node voltages and service restoration while satisfying operating constraints. In this paper, a Self Adaptive Harmony Search algorithm (SAHSA) is proposed to solve the network reconfiguration problem in order to minimize the active and reactive power loss. SAHSA uses a stochastic search and local search instead of a gradient search. Forward and Backward Substitution Power Flow method is used to solve the radial distribution system. The proposed approach is tested on standard IEEE 33-bus and 69-bus radial distribution systems. The results are compared with Music Based Harmony Search Algorithm (MBHSA) and it is observed that the proposed method performed well in terms of the quality of solution.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133799334","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804556
S. Sajadian, E. D. dos Santos
This paper presents a three-phase DC-AC converter with an optimized number of levels per number of switches. Each phase of the proposed converter includes four controlled power switches and it is able to generate five levels. The most significant characteristics of the proposed converter are: (i) reduced number of semiconductor devices, while keeping a high number of levels at the output side of each phase, (ii) no need to control DC-link capacitor voltage as in NPC and flying capacitor topologies, and (iii) reduced semiconductor losses. The principle of operation, modulation technique, and modeling of the proposed converter are presented in this paper. The proposed configuration is simulated and validated experimentally.
{"title":"Three-phase DC-AC converter with five-level four-switch characteristic","authors":"S. Sajadian, E. D. dos Santos","doi":"10.1109/PECI.2014.6804556","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804556","url":null,"abstract":"This paper presents a three-phase DC-AC converter with an optimized number of levels per number of switches. Each phase of the proposed converter includes four controlled power switches and it is able to generate five levels. The most significant characteristics of the proposed converter are: (i) reduced number of semiconductor devices, while keeping a high number of levels at the output side of each phase, (ii) no need to control DC-link capacitor voltage as in NPC and flying capacitor topologies, and (iii) reduced semiconductor losses. The principle of operation, modulation technique, and modeling of the proposed converter are presented in this paper. The proposed configuration is simulated and validated experimentally.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134068572","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804563
Kenta Kirihara, K. Reinhard, A. Yoon, P. Sauer
Phasor Measurement Units (PMUs) installed across North America, compute and store synchrophasor data at select locations. However, the efforts to process the synchrophasor data to meet very high operator trust expectations has been challenging. This paper describes Synchrophasor Data Quality (SDQ) Activity, Trustworthy Cyber Infrastructure for the Power Grid (TCIPG) Project efforts to investigate synchrophasor data archived from American Transmission Company's system including both observations from the field to characterize synchrophasor data quality.
{"title":"Investigating Synchrophasor Data Quality issues","authors":"Kenta Kirihara, K. Reinhard, A. Yoon, P. Sauer","doi":"10.1109/PECI.2014.6804563","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804563","url":null,"abstract":"Phasor Measurement Units (PMUs) installed across North America, compute and store synchrophasor data at select locations. However, the efforts to process the synchrophasor data to meet very high operator trust expectations has been challenging. This paper describes Synchrophasor Data Quality (SDQ) Activity, Trustworthy Cyber Infrastructure for the Power Grid (TCIPG) Project efforts to investigate synchrophasor data archived from American Transmission Company's system including both observations from the field to characterize synchrophasor data quality.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130940537","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 : 2014-04-24DOI: 10.1109/PECI.2014.6804547
Masoud Vaezi, A. Izadian, M. Deldar
Hydraulic wind turbines are highly nonlinear and work severely under variable disturbances such as load on the generators and the wind speed. For further analysis control implementation on these types of systems a suitable linearized model is needed. Due to the disturbances, the system has a wide range of operating points. Therefore, linearized models on different operating regimes will be needed. Finding the best operating points, to linearize the nonlinear system at, can improve the accuracy of the linearization as well as the stability of the system. This paper propose a new automatic algorithm to indicate the suitable operating points and linearized models.
{"title":"A model linearization technique for hydraulic wind power systems","authors":"Masoud Vaezi, A. Izadian, M. Deldar","doi":"10.1109/PECI.2014.6804547","DOIUrl":"https://doi.org/10.1109/PECI.2014.6804547","url":null,"abstract":"Hydraulic wind turbines are highly nonlinear and work severely under variable disturbances such as load on the generators and the wind speed. For further analysis control implementation on these types of systems a suitable linearized model is needed. Due to the disturbances, the system has a wide range of operating points. Therefore, linearized models on different operating regimes will be needed. Finding the best operating points, to linearize the nonlinear system at, can improve the accuracy of the linearization as well as the stability of the system. This paper propose a new automatic algorithm to indicate the suitable operating points and linearized models.","PeriodicalId":352005,"journal":{"name":"2014 Power and Energy Conference at Illinois (PECI)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123517397","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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