{"title":"DC microgrid grounding strategies","authors":"J. Mohammadi, F. B. Ajaei, G. Stevens","doi":"10.1109/icps.2018.8369995","DOIUrl":"https://doi.org/10.1109/icps.2018.8369995","url":null,"abstract":"Grounding strategy of a DC microgrid affects the stray current level, the common-mode voltage, the energy supply reliability, personnel/equipment safety and protection system design. Therefore, a comprehensive knowledge of the available grounding strategies and their effects is essential for design and operation of the DC microgrid components and especially its protection. This paper investigates and compares characteristics of different DC microgrid grounding strategies that involve the choice of grounding configurations and grounding devices. The study includes the grounding strategy impacts on line-to-ground (LG) fault detection and protection, transient LG fault current magnitude, stray current level, common mode voltage, personnel/equipment safety, system reliability, service continuity, and insulation requirements. Finally, the strengths and weaknesses of the various grounding strategies are discussed.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121429912","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}
{"title":"Cascading collapse of a large-scale mixed source microgrid caused by fast-acting inverter-based distributed energy resources","authors":"Jongchan Choi, M. Illindala, A. Mondal, A. Renjit","doi":"10.1109/icps.2018.8370011","DOIUrl":"https://doi.org/10.1109/icps.2018.8370011","url":null,"abstract":"Power electronics-based distributed energy resources (DERs) are being increasingly deployed for achieving high energy efficiency, power quality, and flexibility of power system operation and controls. They facilitate access to various kinds of energy sources including renewables, fuel cells, microturbines, variable speed engine-generator sets, etc. However, recent tests carried out at the Consortium of Electric Reliability Technology Solutions (CERTS) Microgrid have indicated that their deployment in the mixed source microgrid can cause a cascading collapse during extreme events. Simulation models of two types of DERs are developed in PSCAD/EMTDC software and validated with the experimental test results. The validated models are used to study a cascading collapse problem in a large-scale mixed source microgrid on the benchmark IEEE 33-bus test system. This paper evaluates three alternative techniques to prevent the cascading collapse in the large-scale microgrid caused by fast-acting power electronics-based DERs.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121394345","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}
Jongchan Choi, A. Khalsa, D. Klapp, M. Illindala, K. Subramaniam
{"title":"Survivability of synchronous generator-based distributed energy resources for transient overload conditions in a microgrid","authors":"Jongchan Choi, A. Khalsa, D. Klapp, M. Illindala, K. Subramaniam","doi":"10.1109/icps.2018.8370010","DOIUrl":"https://doi.org/10.1109/icps.2018.8370010","url":null,"abstract":"The synchronous generator-based distributed energy resource (DER) is widely used nowadays due to its low cost and simple controls. However, the requirements for power delivery in a microgrid can be stringent due to the harsh demands. Frequent overloads can occur during the microgrid transition between grid-connection and islanded operation. Therefore, it is very important to have a clear understanding on the survivability of a synchronous generator-based DER for transient overload conditions. Recently, experimental tests on survivability of the DER were carried out in the Consortium of Electric Reliability Technology Solutions (CERTS) Microgrid Testbed at American Electric Power. In this paper, an in-depth analysis of the synchronous generator-based DER operation during transient overload conditions is presented. The key relationships governing the system dynamic behavior are investigated to design the load shedding scheme for survivability of the synchronous generator-based DER. Several case studies are presented to demonstrate the validity of the proposed load shedding methods.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116801139","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}
Long Zhao, I. Matsuo, Farshid Salehi, Yuhao Zhou, Weijen Lee
{"title":"Development of a Real-Time Web-Based Power Monitoring system for the substation of petrochemical facilities","authors":"Long Zhao, I. Matsuo, Farshid Salehi, Yuhao Zhou, Weijen Lee","doi":"10.1109/icps.2018.8369965","DOIUrl":"https://doi.org/10.1109/icps.2018.8369965","url":null,"abstract":"Petrochemical industry not only consumes large amount of electricity every year but also requires high quality power supplies. Any unexpected power failure could shut down the entire production line and cause significant financial loss. Meanwhile, due to the large electricity consumption and intensive power demand, in-house cogeneration plants have been equipped for most petrochemical facilities. Thus, any power interruption or disturbance between petrochemical facility and interconnected power grids could affect both sides of the power systems. Therefore, having high power quality becomes one of the most critical parts for petrochemical facilities. To avoid unexpected power failure and to provide better understanding of the power system at petrochemical facilities, a fast, precise and reliable power monitoring system is required. A novel Real-Time Web-Based Power Monitoring system on field-programmable gate array (FPGA) platform is proposed in this paper for a power substation at the petrochemical facility. Besides the data collecting with event triggering mechanism and measurement data recording functions, Subsynchronous Oscillation (SSO) detection application is also developed in this system. This proposed monitoring system could provide precise data to help engineers with insightful analysis of the electric system to prevent power failure, and it also could help system operators to have a better understanding of the system operation characteristics.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123719928","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}
Yuan-Kang Wu, Po-En Su, Ting-Yi Wu, Jing-Shan Hong, M. Y. Hassan
{"title":"Probabilistic wind power forecasting using weather ensemble models","authors":"Yuan-Kang Wu, Po-En Su, Ting-Yi Wu, Jing-Shan Hong, M. Y. Hassan","doi":"10.1109/icps.2018.8369963","DOIUrl":"https://doi.org/10.1109/icps.2018.8369963","url":null,"abstract":"During the past one to two decades, the probabilistic forecasting of wind power generation has been regarded as a necessary input to decisions made for the purpose of reliable and economic power systems operations, especially since the penetration of renewable energy has begun to grow rapidly. Probabilistic forecasting differs from traditional deterministic forecasting in that it takes uncertainty into account. This work proposes a modified nonparametric method for constructing reliable prediction intervals (PIs). The lower upper bound estimation (LUBE) method is adapted to construct PIs for wind power generation, based on ensemble wind speed data from the numerical weather prediction (NWP) system of the Central Weather Bureau (CWB) of Taiwan. The charged search system (CSS) is used to adjust parameters in LUBE. The performance of the proposed method is examined using data sets from three wind farms in Taiwan. Simulation results demonstrate that the quality of PIs output by the proposed model significantly exceeded that of those constructed using the persistence model with a one-hour-ahead time horizon.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132192861","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}
J. C. Fox, R. Hadidi, Nancy LaFlair, J. Leonard, Joseph Hodges
{"title":"Heat generation and failure in padmount transformers due to zero sequence saturation","authors":"J. C. Fox, R. Hadidi, Nancy LaFlair, J. Leonard, Joseph Hodges","doi":"10.1109/icps.2018.8370002","DOIUrl":"https://doi.org/10.1109/icps.2018.8370002","url":null,"abstract":"After a transformer failed following a double phase fault, there was an interest in understanding how the fault mechanism led to the failure. This paper investigate this fault condition in detail and demonstrate the underlying challenges in correcting the failure. The system electrical and thermal models were developed and simulated to analyze the transformer response under double phase fault conditions. Experimental measurements validated the simulation results on a real three phase distribution transformer. This paper presents the results from simulated and experimental analysis from double phase fault on a Yg-Yg distribution transformer.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133075994","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}
{"title":"A novel nonintrusive fault identification for power transmission networks using power-spectrum-based hyperbolic S-transform — Part I: Fault classification","authors":"Hsueh-Hsien Chang, N. V. Linh, Weijen Lee","doi":"10.1109/icps.2018.8369999","DOIUrl":"https://doi.org/10.1109/icps.2018.8369999","url":null,"abstract":"This paper presents a novel nonintrusive protection scheme for fault classification of power transmission networks in a wide-area measurement system (WAMS) using fault information for decision making. The protection scheme is a non-communication without GPS as it depends completely on locally measured currents for the non-intrusive fault monitoring (NIFM) using the power-spectrum-based hyperbolic S-transform (PS-HST). In this work, the HST is used to extract the high frequency components of the current signals generated by an electric fault. To effectively select the HST coefficients (HSTCs) representing fault transient signals with increasing performance, a power spectrum of the HSTCs in different scales calculated by Parseval's Theorem is proposed in this paper. Finally, back-propagation artificial neural networks (BP-ANNs) and PS-HST are used to identify fault types in power transmission networks. The proposed method is tested for different breaker ON/ OFF conditions by simulations using electromagnetic transients program (EMTP) software. The results obtained have proved that the proposed method is promising and demonstrate a high success rates and reliability for considering different fault resistances and inception angles in NIFM applications.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121863736","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}
{"title":"Fault classification and voltage sag parameters computation using voltage ellipses","authors":"J. Camarillo-Peñaranda, G. Ramos","doi":"10.1109/icps.2018.8369997","DOIUrl":"https://doi.org/10.1109/icps.2018.8369997","url":null,"abstract":"A fault classification and voltage sag parameters computation using voltage ellipses in Clarke's domain is presented in this paper. The voltage sag parameters computed are the point-on-wave of initiation and recovery, residual voltage, and phase-angle jump. A change in the phase reference in Clarke's transformation is proposed to simplify the fault classification procedure. The point-on-wave of initiation and recovery are defined based on the reference circle in Clarke's domain described by the system during normal operation. The residual voltage and phase-angle jump are computed using the expressions of alpha and beta components in Clarke's domain and using some trigonometric theorems. The proposed fault classification and voltage sag characteristics computation are applied to real data provided by IEEE 1159.2 WG. The proposed fault classification algorithm is capable of classifying events and computing the residual voltage and phase-angle jump. Also, the voltage sag duration of short events and multistage events is successfully computed. This work is an incremental contribution in the field of voltage sag analysis in the time domain using Clarke's transformation.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130561858","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}
{"title":"Frequency regulation at a wind farm using time-varying inertia and droop controls","authors":"Yuan-Kang Wu, Wu-Han Yang, Yi-Liang Hu, Dung Phan Quoc","doi":"10.1109/icps.2018.8369978","DOIUrl":"https://doi.org/10.1109/icps.2018.8369978","url":null,"abstract":"As renewable power generation becomes more prevalent, the problem of frequency stability has become a particular concern of transmission system operators (TSOs), especially those of small power transmission systems. Traditional wind generation systems do not provide frequency regulation because they are decoupled from the power grid. Therefore, as conventional thermal generators are replaced by wind generators, the issue of frequency regulation for wind generation systems has become increasingly important. To release the kinetic energy stored in the rotating mass, inertia and droop control loops can be added into the controller of a wind turbine (WT). This work proposes an advanced control strategy with the time-varying gains of two control loops. In the proposed strategy, the gains are determined based on the desired frequency-response time. Moreover, the initial gain of the control loop is determined based on the wind speed, considering the operating condition of each WT in a wind farm (WF). The effectiveness of the proposed method is verified using an actual power system, revealing that it can be used to improve frequency regulation in a power grid.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132031574","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}
{"title":"Coordination of transformer on-load tap changer and PV smart inverters for voltage control of distribution feeders","authors":"T. Ku, C. H. Lin, C. S. Chen, C. Hsu","doi":"10.1109/icps.2018.8370007","DOIUrl":"https://doi.org/10.1109/icps.2018.8370007","url":null,"abstract":"The increasing penetration of photovoltaic (PV) generation in distribution systems has entailed dramatic deterioration of distribution system voltage quality due to power injection by PV systems. This paper presents a coordinating control strategy of on-load tap changer (OLTC) of the main transformer in a substation and PV smart inverters to maintain good service voltage quality for the distribution network with high penetration of PV systems. The voltage level at the end-point of each distribution feeder and the power generation by each PV system are collected via a renewable management system. The hourly tap position of OLTC is then derived based on the daily profiles of feeder voltage variation and the injected power generated by all PV systems along the feeder. The PV smart inverters execute an autonomous control of reactive power compensation so that the voltage at the point of common coupling (PCC) can be fixed at the specified voltage level. A main transformer, which serves six feeders with high PV penetration in Taiwan Power Company (Taipower), was selected for this case study. With the proposed coordinating control of OLTC and PV smart inverters, the impact of service voltage quality due to the high penetration of PV systems in the distribution system can be effectively mitigated.","PeriodicalId":142445,"journal":{"name":"2018 IEEE/IAS 54th Industrial and Commercial Power Systems Technical Conference (I&CPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128712792","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}