2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)最新文献

{"title":"Distributed Optimization Approach for Frequency Control with Emulated Virtual Inertia in Islanded Microgrids","authors":"H. Liu, Lin-Yu Lu, Ziping Wu, A. Valdes","doi":"10.1109/ISGT-ASIA.2018.8467931","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467931","url":null,"abstract":"Microgrids (MGs), whether entirely islanded or operated as part of a larger electrical power system, are emerging as a useful strategy not only for integration of distributed energy resources (DERs) but also to improve resilience and efficiency in power systems. When a MG is islanded from the main grid, maintaining frequency control is challenging since fast-acting DERs are connected via power-electronic inverters and thus lack rotational inertia. In this paper, we adopt the virtual inertia concept and propose a distributed frequency control design that ensures stable and synchronized operation at a nominal frequency while guaranteeing proportional active power sharing among DER interface converters (DICs). The novelty of this design lies in incorporating DICs to emulate virtual inertia while providing stability and performance guarantees from an optimization view. With modest assumptions on the MG, the distributed frequency control is cast as a consensus optimization problem and solve by the partial primal-dual (PPD) algorithm. Interestingly, the control updates based on PPD are well suited for the cyber-physical coupling of the MG network. Specifically, parts of the updates mimic the network dynamics, which is seamlessly implemented by the physical system itself. We provide initial numerical results based on real-time simulation of an abrupt system load change, demonstrating that the proposed frequency control quickly restores frequency to a nominal point and enhances the transient stability by inertia emulation.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130532746","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":"Analysis of Strategies for Integrating 175 GW of Renewable Energy in India","authors":"S. Soonee, S. Narasimhan, M. Joshi, J. Cochran, David Palchak, Ali Ehlen, Brendan McBennett, P. Sreedharan, N. Abhyankar, R. Deshmukh","doi":"10.1109/ISGT-ASIA.2018.8467840","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467840","url":null,"abstract":"Integration of large scale renewables into the electrical grid is currently one of the major challenges and priorities for many countries. The Government of India (GOI) has committed to install 175 GW renewable energy (RE) by 2022. Due to favorable policies, RE capacity in India recently exceeded 60 GW, overtaking hydropower as the second largest fleet. To assess the impact of large scale RE on the power system, three studies (one national and two regional) were undertaken jointly by the United States Agency for International Development (USAID) and the Ministry of Power (MOP), GOI. The studies used production cost models to simulate the Indian electricity system for each 15-minute time block of the year 2022 to understand potential future operational challenges and opportunities for more cost-effective integration. This paper is an abridged version of the national study titled, “Greening the Grid: Pathways to Integrate 175 Gigawatts of Renewable Energy into India’s Electric Grid, Vol. I — National Study” (June 2017). The study concluded that the integration of 175 GW of RE, equivalent to 370 TWh annual generation and 22% demand penetration, is achievable at 15-minute operational timescales with minimal RE curtailment. If the thermal fleet exploits their ramping capabilities and lower minimum generation levels, the Indian power system has sufficient flexibility to manage net load changes and RE forecast errors. Along with thermal fleet flexibility, the latent flexibility in hydroelectric generation is critical in maintaining system balance. The study analyzed integration strategies that may generate cost savings and lower RE curtailment. Coordinated scheduling across regional and national levels, which increases the size of the balancing areas, lowers RE curtailment and reduces annual production costs. Reducing the technical minimum of thermal plants has the biggest impact on reducing RE curtailment. The study’s implications to policy makers, planners, and regulators include coordinated transmission planning, better coordination among states for scheduling and dispatch, and incentives for system flexibility.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131488988","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":"Stochastic Backward/Forward Sweep Power Flow Analysis for Islanded Microgrids","authors":"Lalitha Subramanian, H. Gooi","doi":"10.1109/ISGT-ASIA.2018.8467763","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467763","url":null,"abstract":"Distributed generation-based islanded microgrids lack a constant reference voltage node, making it difficult to compute the power flows in the microgrid using traditional power system analysis tools. In this work, we model the droop equations that allow voltage and frequency regulation among the distributed sources in the backward/forward sweep algorithm. As a result, the system frequency is one of the unknown state variables that has to be computed by power flow analysis. Since the backward/forward sweep algorithm is primarily applied only to radial distribution systems, the algorithm is then modified to extend its applicability to weakly-meshed microgrid topologies. The distributed generation units are modelled as solar generation with their uncertainties defined by Beta distribution while the load uncertainties are modelled using normal distribution. Finally, a stochastic islanded microgrid power flow tool is developed using the polynomial chaos approximation technique.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"112 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132670981","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":"Automatic Generation of Input Data for Distribution System Simulation Programs","authors":"Tomo Tadokoro, T. Noda, K. Ishimoto, N. Okada, S. Uemura, Y. Shumuta","doi":"10.1109/ISGT-ASIA.2018.8467719","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467719","url":null,"abstract":"Computers have become quite fast, and therefore, the most time-consuming process in distribution system simulations is, in fact, the preparation of input data cases for the simulation programs. Considering this fact, we have developed a computer system which automatically generates input data cases for various distribution system simulation programs from a distribution facility database owned by a utility company. The distribution system simulation programs include a voltage analysis program, an electromagnetic transient analysis program, a harmonics analysis program, a lightning outage risk assessment program and an earthquake and storm (typhoon) risk assessment program. The planning, operation and troubleshooting of a distribution system nowadays are highly dependent on these simulation programs. Using the developed system, a distribution engineer can automatically prepare a simulation data case by specifying a feeder, a transformer bank or an area to be analyzed, and then she/he is readily able to start the simulation. The developed system is also effective to avoid human errors in the data preparation process.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133182054","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":"Design of Decentralized Droop Control Structure of DC Microgrid with Constant Power Loads and Source Disturbances","authors":"Ginbar Ensermu, A. Bhattacharya","doi":"10.1109/ISGT-ASIA.2018.8467925","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467925","url":null,"abstract":"DC microgrid with different sources and constant power load is studied in this paper. Considering the impact of source disturbances and load variation, a decentralized control is employed using dc bus signal (DBS) scheme. This control strategy enables autonomous control of distributed converters which enhances the system reliability and flexibility. In this case, mode adaptive droop and maximum power control structures are employed to limit the voltage and power fluctuations due to source disturbances. Moreover, the control approach empowers power sharing among the different sources and facilitates mode transitions. Three different modes of operations are employed based on to which source types governing power balances. Input filter with parallel passive damping also incorporated to mitigate the dc bus voltage oscillations and to regulate load voltage constant. Finally, performance of the dc microgrid control is verified using MATLAB/SIMULINK.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115200461","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 Simulation Model for analyzing the State of Charge of Electric Vehicle","authors":"Syed M. Arif, T. Lie, Boon-Chong Seet","doi":"10.1109/ISGT-ASIA.2018.8467760","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467760","url":null,"abstract":"One of the biggest challenges in the research and development of the electric vehicle and hybrid electric vehicle is the battery technology and it’s charging time interval. We proposed a Novel simulation model for the electric vehicle. In addition, the mode of operations including Start and low to midrange speeds, Driving Under Normal Conditions, Sudden Acceleration, and Deceleration for the hybrid electric vehicle have been studied.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"38 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130908835","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":"Using Combinational Methods for Forecast Improvement in PV Power Plants","authors":"Gokhan Mert Yagli, Monika, Dazhi Yang, D. Srinivasan","doi":"10.1109/ISGT-ASIA.2018.8467878","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467878","url":null,"abstract":"Power generation based on photovoltaic systems are one of the crucial energy resources of the future smart grid owing to environmental concerns. With the increasing involvement of photovoltaics into the smart grid, more accurate and reliable generation forecasts are essential for robust grid operations. In this paper, the authors have used the combining forecast method with forecasts generated from five different techniques, two of which use physical forecasting models and three of them use time series models. The methods are applied to simulation data of 12 PV power plants in the California region. Applying the combinational method to the generated forecasts, 25%-33% accuracy improvements are observed compared to the reference model.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126343512","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":"Introducing A New Type of Protection Zone for the Smart Grid Incorporating Distributed Generation","authors":"P. Manditereza, R. Bansal","doi":"10.1109/ISGT-ASIA.2018.8467792","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467792","url":null,"abstract":"One of the performance criteria of protection is selectivity which aims to minimise the area shut down following fault occurrence. Selectivity is facilitated by splitting the electrical power network into zones. Protection schemes are incorporated into each zone to provide primary protection and back-up protection for external faults. The integration of distributed generators is contributing to the transformation of the power grid to a distributed architecture that incorporates hybrid microgrids and energy storage systems. This transformation impacts the sensitivity, stability and speed of the existing protection schemes leading to possible loss of selectivity, especially at the distribution level. This paper proposes a new type of protection zone, the Busbar Area Protection (BAP) zone that extends to include a busbar and all feeders fed from that busbar. The BAP zone facilitates protection that is able to eliminate the impact of DG integration on selectivity, while significantly reducing the protection component count at a busbar to only one primary relay irrespective of the number of feeders terminating at that node, in contrast to most other protection relaying systems that require at least one relay dedicated to each feeder. The protection operates under smart grid environment with intelligent electronic devices (IEDs) exchanging voltage measurements using peer-to-peer communications.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124114824","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":"Research on Frequency Control of Virtual Synchronous Generator without Frequency Deviation in Microgrid","authors":"Binbin Dong, Jianbo Yi, Lei Han, Yufei Teng, Weihao Hu, Qi Huang","doi":"10.1109/ISGT-ASIA.2018.8467936","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467936","url":null,"abstract":"The Virtual Synchronous Generator (VSG) is viewed as an efficient approach to simulate traditional mechanical inertia of micro-sources inverters in microgrid. But the traditional frequency control of VSG cannot rectify the frequency deviation. This paper aims to reveal the reason of VSG frequency deviation by comparing different power-frequency control methods. Then the paper proposes a novel strategy directly inputting frequency deviation into the equation of rotor motion to get better performance of frequency control. Finally, a VSG grid-connected model with loads changing is used to test the characteristics of frequency response. The discussion and analysis of the results show the proposed frequency control strategy has good performance on secondary frequency regulation and system stability of microgrid.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129353768","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 Transformer Latent Fault Warning Strategy Based on Self-Adaptive Threshold Values","authors":"Liang Yong-liang, Xue Yong-duan, Li Ke-jun, Chen Jian","doi":"10.1109/ISGT-ASIA.2018.8467956","DOIUrl":"https://doi.org/10.1109/ISGT-ASIA.2018.8467956","url":null,"abstract":"Dissolved gas analysis(DGA) is considered as the most effective method to detect latent fault of transformers. But the stationary threshold values are tend to decrease the sensitivity of the fault early warning. In this paper, a transformer latent fault early warning strategy is proposed based on self-adaptive threshold values. First, upper bound and lower bound of historical gas concentration data is obtained by kernel – smoothing method. Then, the future threshold values could be obtained through a self-adaptive prediction model based on PSOGSA-kELM. Moreover, the warning strategy is made based on the comparison between new detected data and predicted threshold values. By the comparison between other existed warning methods, the feasibility of proposed warning strategy is testified.","PeriodicalId":126140,"journal":{"name":"2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127379531","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}