Pub Date : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230555
Mohammad Razeghi-Jahromi, D. Coats, J. Stoupis
An algorithm for distributed optimal voltage regulation of distribution networks with distributed generators (DGs) at the grid edge is proposed in the paper. We first introduce a distributed recursive algorithm to estimate the sensitivity parameters of the network without needing any information exchange between the edge computing devices. Then, we cast the distributed voltage control problem as a distributed linear program which can be solved efficiently on edge computing devices to minimally adjust DGs generations. The algorithm is tested with EPRI Test Ckt24 and the results are compared with the situation when data exchange is available between the edge devices.
提出了一种基于分布式发电机的配电网络的分布式最优电压调节算法。我们首先引入一种分布式递归算法来估计网络的灵敏度参数，而不需要在边缘计算设备之间进行任何信息交换。然后，我们将分布式电压控制问题转化为可在边缘计算设备上有效解决的分布式线性程序，以最小限度地调整dg的代数。用EPRI Test Ckt24对算法进行了测试，并将结果与边缘设备之间可用数据交换的情况进行了比较。
{"title":"Distributed Optimal Voltage Regulation for Distribution Networks with DGs at the Energy Delivery Grid Edge with Limited Information Exchange","authors":"Mohammad Razeghi-Jahromi, D. Coats, J. Stoupis","doi":"10.1109/POWERCON48463.2020.9230555","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230555","url":null,"abstract":"An algorithm for distributed optimal voltage regulation of distribution networks with distributed generators (DGs) at the grid edge is proposed in the paper. We first introduce a distributed recursive algorithm to estimate the sensitivity parameters of the network without needing any information exchange between the edge computing devices. Then, we cast the distributed voltage control problem as a distributed linear program which can be solved efficiently on edge computing devices to minimally adjust DGs generations. The algorithm is tested with EPRI Test Ckt24 and the results are compared with the situation when data exchange is available between the edge devices.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123803778","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 : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230620
Dr. T.Bhavani Shanker, V. Vaidhyanathan, R. Shyam, A. Mohamed
Periodic condition monitoring of Transformers -play a key role right from generating station to the distribution of power-ensuring uninterrupted power supply. Transformers have complex insulation system and assessing condition of the insulation system for defects like partial discharges, hot spots, ingress of moisture due to loosening of gaskets etc., is very essential. Condition monitoring techniques such as off-line and/or on-line are adopted to assess the condition of insulation system. This paper presents the in-situ findings of the periodic condition monitoring of 220kV class transformers in a power generation station in India. Acoustic emission technique which is one of the on-line test tools for periodic condition monitoring and also to study the relative performance by carrying out the test over different years, is used in this paper. Recovery voltage measurement is an off-line test being used to assess the moisture content in the paper-oil insulation system of the transformer. The results obtained with on-line acoustic emission measurements using acoustic emission technique were found to be comparative in terms of their respective magnitude with the results obtained with off-line Recovery Voltage Measurement (RVM) test.
{"title":"In- situ On-line Acoustic Emission Measurement and Off-line Recovery Voltage Measurement for periodic condition monitoring of oil-filled 220kV transformers- comparison of results","authors":"Dr. T.Bhavani Shanker, V. Vaidhyanathan, R. Shyam, A. Mohamed","doi":"10.1109/POWERCON48463.2020.9230620","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230620","url":null,"abstract":"Periodic condition monitoring of Transformers -play a key role right from generating station to the distribution of power-ensuring uninterrupted power supply. Transformers have complex insulation system and assessing condition of the insulation system for defects like partial discharges, hot spots, ingress of moisture due to loosening of gaskets etc., is very essential. Condition monitoring techniques such as off-line and/or on-line are adopted to assess the condition of insulation system. This paper presents the in-situ findings of the periodic condition monitoring of 220kV class transformers in a power generation station in India. Acoustic emission technique which is one of the on-line test tools for periodic condition monitoring and also to study the relative performance by carrying out the test over different years, is used in this paper. Recovery voltage measurement is an off-line test being used to assess the moisture content in the paper-oil insulation system of the transformer. The results obtained with on-line acoustic emission measurements using acoustic emission technique were found to be comparative in terms of their respective magnitude with the results obtained with off-line Recovery Voltage Measurement (RVM) test.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133188830","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 : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230548
K. Thapa, Kishan Jayasawal, P.R. Khatri
As per the grid code requirements for low voltage ride-through (LVRT), the wind turbine generator (WTG) should survive and produce reactive power to prop up the grid voltage during a disturbance. The manuscript proposes an enhanced LVRT control capability of a doubly fed induction generator (DFIG) based wind power plant (WPP). To accomplish it, the rotor side converter (RSC) controller of the DFIG is provided with adaptive reactive current to voltage (IQ-V) characteristics and the WPP controller provides different reference voltage to each DFIG, relying on their rotor voltage margins (RVM). Thus, the DFIGs in a WPP injects different amount of reactive power into the grid to prop up voltage at point of interconnection (POI). To survive the DFIG during a fault, the reference electromagnetic torque in the RSC of the DFIGs is decreased proportionate to the weighting factor and voltage sags at the terminals of the DFIGs intending to monitor the voltage rise across the capacitor of the DC-link. The proposed method is tested for 120 MVA WPP consisting of twenty 6-MVA DFIGs. The results validate the ability of the proposed method to produce additional reactive power in comparison to the conventional method to contribute to the POI voltage and regulate voltage rise in DC-link of the DFIGs during a grid disturbance.
{"title":"Enhanced Low Voltage Ride- Through Control Capability of a DFIG-Based Wind Power Plant","authors":"K. Thapa, Kishan Jayasawal, P.R. Khatri","doi":"10.1109/POWERCON48463.2020.9230548","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230548","url":null,"abstract":"As per the grid code requirements for low voltage ride-through (LVRT), the wind turbine generator (WTG) should survive and produce reactive power to prop up the grid voltage during a disturbance. The manuscript proposes an enhanced LVRT control capability of a doubly fed induction generator (DFIG) based wind power plant (WPP). To accomplish it, the rotor side converter (RSC) controller of the DFIG is provided with adaptive reactive current to voltage (IQ-V) characteristics and the WPP controller provides different reference voltage to each DFIG, relying on their rotor voltage margins (RVM). Thus, the DFIGs in a WPP injects different amount of reactive power into the grid to prop up voltage at point of interconnection (POI). To survive the DFIG during a fault, the reference electromagnetic torque in the RSC of the DFIGs is decreased proportionate to the weighting factor and voltage sags at the terminals of the DFIGs intending to monitor the voltage rise across the capacitor of the DC-link. The proposed method is tested for 120 MVA WPP consisting of twenty 6-MVA DFIGs. The results validate the ability of the proposed method to produce additional reactive power in comparison to the conventional method to contribute to the POI voltage and regulate voltage rise in DC-link of the DFIGs during a grid disturbance.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132230440","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 : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230534
K. Shanmugam, Giovanni Pitto, Lucio Barbato
Energy is a crucial ingredient for economic development of any country. Renewables provides access to clean energy quickly with lower cost and stable energy prices, with increase in reliability and resiliency. The integration of RES to the utility grid raises more fascinating challenges in integration, operation and control, protection as numerous components (power electronic converters) and constraints are involved. Grid codes are the enablers of the energy transition era, also plays an important role in defining the boundary between the requirements of secure grid operation and receiving highest possible share of RES to achieve the cost efficient energy mix. In this paper we investigated the requirements to connect the Renewable Energy Sources plants to the utility grid considering different grid codes and international standards. A renewable plant controller is proposed at plant level in order to make renewable plants to compliant to the connected grid code standards. The DIGSILENT power factory software is used to model and simulate the operation of renewable power plants, along with Battery Energy Storage System. The simulation model is analyzed with different operating conditions of power grid, to validate the compliance of renewable plant controller. In addition overview of the various international standards are provided, focusing on operational and control requirements demanded to grid connected Renewable Energy Sources plants.
{"title":"Gridcode compliances and Operational Requirements of Grid connected BESS-Reneweable Power Plants","authors":"K. Shanmugam, Giovanni Pitto, Lucio Barbato","doi":"10.1109/POWERCON48463.2020.9230534","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230534","url":null,"abstract":"Energy is a crucial ingredient for economic development of any country. Renewables provides access to clean energy quickly with lower cost and stable energy prices, with increase in reliability and resiliency. The integration of RES to the utility grid raises more fascinating challenges in integration, operation and control, protection as numerous components (power electronic converters) and constraints are involved. Grid codes are the enablers of the energy transition era, also plays an important role in defining the boundary between the requirements of secure grid operation and receiving highest possible share of RES to achieve the cost efficient energy mix. In this paper we investigated the requirements to connect the Renewable Energy Sources plants to the utility grid considering different grid codes and international standards. A renewable plant controller is proposed at plant level in order to make renewable plants to compliant to the connected grid code standards. The DIGSILENT power factory software is used to model and simulate the operation of renewable power plants, along with Battery Energy Storage System. The simulation model is analyzed with different operating conditions of power grid, to validate the compliance of renewable plant controller. In addition overview of the various international standards are provided, focusing on operational and control requirements demanded to grid connected Renewable Energy Sources plants.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116465126","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 : 2020-09-14DOI: 10.1109/powercon48463.2020.9230537
Virtual Conference
{"title":"2020 IEEE International Conference on Power System Technology (POWERCON) Virtual Conference","authors":"Virtual Conference","doi":"10.1109/powercon48463.2020.9230537","DOIUrl":"https://doi.org/10.1109/powercon48463.2020.9230537","url":null,"abstract":"","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122663306","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 : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230699
David Oweka, M. Edimu, J. Serugunda, R. Okou
Generation scheduling involves determination of startup and shutdown times and power outputs of all generating units at each time step, over a specified period. The scheduling of electricity production from power producers in Uganda is carried out by considering only the type of generation plants available to ensure demand-supply balance and that the power system remains stable. There is need to develop a generation scheduling procedure that not only maintains the power system in equilibrium but also maximizes utilization of available plants, minimizes both electricity production and transmission costs while reducing bulk network constraints. This paper presents an alternative generation scheduling protocol, applied to the 132kV bulk network of Uganda. The protocol starts with a short-term load forecast to establish the demand. Optimum hourly power plant outputs were determined by solving a four-plant optimal power flow problem whose objective function is an aggregation of generator cost functions subjected to active grid constraints in MatLab-PSAT. Assessment of scheduling results revealed significant reduction in cost of generating and transmitting bulk power attributed to improved plant utilization. The bulk network performance was enhanced as exhibited by improved node voltage regulation, reduction in bulk network loss and improved transmission capacity usage as per load flow analysis results obtained using DIgSILENT Power Factory software 15.1.
发电计划包括确定每个时间步长在指定时间段内所有发电机组的启动和关闭时间和功率输出。乌干达电力生产商的电力生产计划是通过只考虑可确保供需平衡和电力系统保持稳定的发电厂类型来进行的。有必要制定一种发电调度程序，不仅要使电力系统保持平衡，而且要最大限度地利用现有电厂，最大限度地减少电力生产和传输成本，同时减少大电网的限制。提出了一种适用于乌干达132kV大电网的替代发电调度协议。该协议从短期负荷预测开始，以确定需求。在MatLab-PSAT中，通过求解一个四厂最优潮流问题来确定最佳每小时发电厂输出，该问题的目标函数是受主动电网约束的发电机成本函数的集合。对调度结果的评估显示，由于电厂利用率的提高，发电和输电成本显著降低。根据DIgSILENT Power Factory软件15.1的负载流分析结果，改进了节点电压调节，减少了批量网络损耗，提高了传输容量利用率，从而提高了批量网络性能。
{"title":"Optimal Generation Scheduling Approach Applied to the Transmission Grid of Uganda for Enhanced Performance and Cost Reduction","authors":"David Oweka, M. Edimu, J. Serugunda, R. Okou","doi":"10.1109/POWERCON48463.2020.9230699","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230699","url":null,"abstract":"Generation scheduling involves determination of startup and shutdown times and power outputs of all generating units at each time step, over a specified period. The scheduling of electricity production from power producers in Uganda is carried out by considering only the type of generation plants available to ensure demand-supply balance and that the power system remains stable. There is need to develop a generation scheduling procedure that not only maintains the power system in equilibrium but also maximizes utilization of available plants, minimizes both electricity production and transmission costs while reducing bulk network constraints. This paper presents an alternative generation scheduling protocol, applied to the 132kV bulk network of Uganda. The protocol starts with a short-term load forecast to establish the demand. Optimum hourly power plant outputs were determined by solving a four-plant optimal power flow problem whose objective function is an aggregation of generator cost functions subjected to active grid constraints in MatLab-PSAT. Assessment of scheduling results revealed significant reduction in cost of generating and transmitting bulk power attributed to improved plant utilization. The bulk network performance was enhanced as exhibited by improved node voltage regulation, reduction in bulk network loss and improved transmission capacity usage as per load flow analysis results obtained using DIgSILENT Power Factory software 15.1.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123061542","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 : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230552
Roshan Pradhan, Arjun Kumar, A. Panda
In recent years, with the advancement of technology in the field of power electronics, most of the loads are nonlinear in nature. The current harmonics for such types of loads may not necessarily be below the prescribed value of 5% according to the IEEE-519 grid code. Harmonic compensation required for such types of nonlinear loads may be achieved with the help of compensators such as shunt active power filter (SAPF). Generally SAPF is connected at the point of common coupling (PCC) between the gird and the PVDG system for harmonic compensation. But, such a system leads to an increase in the cost as well as complexity of the overall system. In this paper, the shunt APF has been integrated with the inverter for compensation of current harmonics for the nonlinear load. The inverter is controlled with the help of a reference current that has been generated using the widely acknowledged instantaneous reactive power theory. The switching pulse to the inverter will be given in such a manner that the inverter will generate the current harmonics required by the load. The objective is to integrate power quality enhancement technique in the Photovoltaic inverter so that it does not require an additional active power filter in the point of common coupling for power quality improvement. Also the inverter can be used to supply power to grid.
{"title":"Model Predictive Control Based PVDG System With Integrated Power Quality Features","authors":"Roshan Pradhan, Arjun Kumar, A. Panda","doi":"10.1109/POWERCON48463.2020.9230552","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230552","url":null,"abstract":"In recent years, with the advancement of technology in the field of power electronics, most of the loads are nonlinear in nature. The current harmonics for such types of loads may not necessarily be below the prescribed value of 5% according to the IEEE-519 grid code. Harmonic compensation required for such types of nonlinear loads may be achieved with the help of compensators such as shunt active power filter (SAPF). Generally SAPF is connected at the point of common coupling (PCC) between the gird and the PVDG system for harmonic compensation. But, such a system leads to an increase in the cost as well as complexity of the overall system. In this paper, the shunt APF has been integrated with the inverter for compensation of current harmonics for the nonlinear load. The inverter is controlled with the help of a reference current that has been generated using the widely acknowledged instantaneous reactive power theory. The switching pulse to the inverter will be given in such a manner that the inverter will generate the current harmonics required by the load. The objective is to integrate power quality enhancement technique in the Photovoltaic inverter so that it does not require an additional active power filter in the point of common coupling for power quality improvement. Also the inverter can be used to supply power to grid.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130105196","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 : 2020-09-14DOI: 10.1109/POWERCON48463.2020.9230567
Ravi Raj, Anupama Kowli, Sai Rupa V
The variability in the actual solar production from its average for a dispatch interval may be significant during morning and evening ramps due to the diurnal nature of solar production. This variability needs to be assessed to design appropriate mechanisms to mitigate it. This paper discusses a framework to decompose imbalances introduced due to intra-dispatch interval variability into two components, considering the causes due to which they manifest. The framework is applied to actual field data of daily solar generation profiles for a year of 1- min resolution. Studies suggests that relatively slower component can be identified from the noisy fluctuations and should be handled separately so that the burden of the frequency regulation services will be relieved.
{"title":"Evaluating The Ramping Trends And Noisy Fluctuations From Solar Power Imbalances","authors":"Ravi Raj, Anupama Kowli, Sai Rupa V","doi":"10.1109/POWERCON48463.2020.9230567","DOIUrl":"https://doi.org/10.1109/POWERCON48463.2020.9230567","url":null,"abstract":"The variability in the actual solar production from its average for a dispatch interval may be significant during morning and evening ramps due to the diurnal nature of solar production. This variability needs to be assessed to design appropriate mechanisms to mitigate it. This paper discusses a framework to decompose imbalances introduced due to intra-dispatch interval variability into two components, considering the causes due to which they manifest. The framework is applied to actual field data of daily solar generation profiles for a year of 1- min resolution. Studies suggests that relatively slower component can be identified from the noisy fluctuations and should be handled separately so that the burden of the frequency regulation services will be relieved.","PeriodicalId":306418,"journal":{"name":"2020 IEEE International Conference on Power Systems Technology (POWERCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131389621","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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