Pub Date : 2017-11-01DOI: 10.1109/APPEEC.2017.8308993
R. Gnanavignesh, G. Gurrala, U. Shenoy
This paper proposes a piecewise parallel solution to the Newton-Raphson power flow problem using the concept of current mismatches, instead of power mismatches. The given large network is divided into a number of smaller sub-networks. Computations are performed upon the individual sub-networks. Then the sub-network solutions are consolidated to obtain the solution of the original network using the Large Change Sensitivity concept. No restrictions are imposed on the number and size of the sub-networks in this method. Also, complications such as temporary slack bus assignment for each sub-network and bus reordering do not arise. The number of iterations required for convergence remains exactly the same as that for the original undivided network. The proposed algorithm is tested on 118, 300, 2383, 6515, 9241 and 13659 bus test systems. For large systems, a speed up of 5 to 6 times is obtained compared to the sequential current mismatch based solution.
{"title":"A piecewise parallel solution of current mismatch based Newton-Raphson power flow","authors":"R. Gnanavignesh, G. Gurrala, U. Shenoy","doi":"10.1109/APPEEC.2017.8308993","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308993","url":null,"abstract":"This paper proposes a piecewise parallel solution to the Newton-Raphson power flow problem using the concept of current mismatches, instead of power mismatches. The given large network is divided into a number of smaller sub-networks. Computations are performed upon the individual sub-networks. Then the sub-network solutions are consolidated to obtain the solution of the original network using the Large Change Sensitivity concept. No restrictions are imposed on the number and size of the sub-networks in this method. Also, complications such as temporary slack bus assignment for each sub-network and bus reordering do not arise. The number of iterations required for convergence remains exactly the same as that for the original undivided network. The proposed algorithm is tested on 118, 300, 2383, 6515, 9241 and 13659 bus test systems. For large systems, a speed up of 5 to 6 times is obtained compared to the sequential current mismatch based solution.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"491 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120867159","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308944
S. Reddy, B. Naik, L. Umanand
The voltage gain of conventional non-isolated dc-dc converters like the boost converter is limited due to capacitor discharge at near unity duty cycles. Most non-isolated converters can provide a practical gain of around 4. This paper presents a non-isolated bidirectional converter which is capable of providing significantly high gains when operated at duty ratios close to 0.5. The proposed converter topology employs a H bridge configuration with four bidirectional switches. The operation of the proposed converter involves 4 power devices, a single filter inductor and output capacitor. Detailed operation of the converter considering factors such as non-idealities and efficiency is presented in this paper. Digital controller is designed using root locus technique for closed loop operation of the proposed converter. For a given efficiency, the proposed converter achieves better voltage gain (15–20) compared to the existing high gain converters. A MATLAB simulation study is carried to validate the analysis and operation of the converter. Finally, comparison of the proposed converter with the conventional boost converter in terms of gain and efficiency is also presented.
{"title":"A novel non-isolated bidirectional DC-DC converter for high voltage gain applications","authors":"S. Reddy, B. Naik, L. Umanand","doi":"10.1109/APPEEC.2017.8308944","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308944","url":null,"abstract":"The voltage gain of conventional non-isolated dc-dc converters like the boost converter is limited due to capacitor discharge at near unity duty cycles. Most non-isolated converters can provide a practical gain of around 4. This paper presents a non-isolated bidirectional converter which is capable of providing significantly high gains when operated at duty ratios close to 0.5. The proposed converter topology employs a H bridge configuration with four bidirectional switches. The operation of the proposed converter involves 4 power devices, a single filter inductor and output capacitor. Detailed operation of the converter considering factors such as non-idealities and efficiency is presented in this paper. Digital controller is designed using root locus technique for closed loop operation of the proposed converter. For a given efficiency, the proposed converter achieves better voltage gain (15–20) compared to the existing high gain converters. A MATLAB simulation study is carried to validate the analysis and operation of the converter. Finally, comparison of the proposed converter with the conventional boost converter in terms of gain and efficiency is also presented.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"2010 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127343940","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308913
Lin Cheng, Manjun Liu, Dan Wang, Danyue Wu, Zhenhua Xu, Yi Su
This paper proposes an improved evidence theory and presents a method to get the outage rate of electrical equipment considering various outage factors. The improved evidence theory is proposed to obtain the real-time outage rate integrating various outage factors. Combined with the real-time power system operating information, the weather forecast information, the on-line monitoring information and the geographical information, this paper presents several outage rate models considering the occasional outages and protection devices' operation when the component is working abnormally. Then the correlations between the various outage factors and critical outage factor is analyzed, an integrated outage rate model is given considering the subjective judgement and objective data based on the improved evidence theory. This outage rate model could be used to discover the possible outage components in the current operating condition.
{"title":"The outage rate model based on the improved evidence theory considering various outage factors","authors":"Lin Cheng, Manjun Liu, Dan Wang, Danyue Wu, Zhenhua Xu, Yi Su","doi":"10.1109/APPEEC.2017.8308913","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308913","url":null,"abstract":"This paper proposes an improved evidence theory and presents a method to get the outage rate of electrical equipment considering various outage factors. The improved evidence theory is proposed to obtain the real-time outage rate integrating various outage factors. Combined with the real-time power system operating information, the weather forecast information, the on-line monitoring information and the geographical information, this paper presents several outage rate models considering the occasional outages and protection devices' operation when the component is working abnormally. Then the correlations between the various outage factors and critical outage factor is analyzed, an integrated outage rate model is given considering the subjective judgement and objective data based on the improved evidence theory. This outage rate model could be used to discover the possible outage components in the current operating condition.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124920135","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308990
S. Bansal, A. Ghosh, C. Seelamantula, G. Gurrala, P. Ghosh
This paper proposes a new approach for estimating fundamental frequency of grid signals. The approach is based on a discrete-time energy separation algorithm (DESA) combined with an adaptive bandpass filter (BPF). The BPF is built using a discrete Fourier transform (DFT) and inverse DFT both used recursively. The technique is computationally efficient and robust to the harmonics and noise in the signal. The method's performance is validated by comparing the results with some existing algorithms.
{"title":"Adaptive frequency estimation using iterative DESA with RDFT-based filter","authors":"S. Bansal, A. Ghosh, C. Seelamantula, G. Gurrala, P. Ghosh","doi":"10.1109/APPEEC.2017.8308990","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308990","url":null,"abstract":"This paper proposes a new approach for estimating fundamental frequency of grid signals. The approach is based on a discrete-time energy separation algorithm (DESA) combined with an adaptive bandpass filter (BPF). The BPF is built using a discrete Fourier transform (DFT) and inverse DFT both used recursively. The technique is computationally efficient and robust to the harmonics and noise in the signal. The method's performance is validated by comparing the results with some existing algorithms.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125308961","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308963
N. Kenneth, T. Logenthiran
This paper presents a new concept for calculating electricity price for electrical vehicles by establishing congestion pricing through the development of locational marginal pricing strategy. The proposed electricity pricing strategy can be used by Individual System Operators whom do not have a feasible resolution aimed at electricity congestion at the moment. This research suggests regulation of electricity pricing of electrical vehicle consumption. In this research, three power flow market analysis with electrical vehicles are simulated and compared by using Power World Simulator. Furthermore, the parameters such as power, current, voltage and charging price are extracted from Power World software and used in the proposed methodology (i.e. distribution locational marginal price) for deciding electricity prices. Collectively, a novel concept is presented for electric vehicles. This concept can be commercialized through a proposition to Energy Market Authority or Individual System Operator by highlighting the affordable price points while easing congestion of transmission lines. For ease of consumer usage, a mobile application has been developed to show the charging prices and corresponding charging locations for electrical vehicles.
本文通过发展区位边际定价策略，建立拥堵定价，提出了一种计算电动汽车电价的新概念。建议的电价策略可供个别系统营办商使用，而这些营办商目前对电力拥塞没有可行的解决方案。本研究建议对电动汽车消费电价进行监管。本研究利用power World Simulator对三种电动汽车潮流市场分析进行了仿真和比较。此外，从power World软件中提取功率、电流、电压和充电价格等参数，并将其用于确定电价的建议方法(即配电位置边际价格)。总的来说，电动汽车提出了一个新的概念。这一概念可以通过向能源市场管理局或个人系统运营商提出商业化建议，突出可负担的价格点，同时缓解输电线路的拥堵。为了方便消费者使用，我们开发了一个移动应用程序来显示电动车的充电价格和相应的充电地点。
{"title":"A novel concept for calculating electricity price for electrical vehicles","authors":"N. Kenneth, T. Logenthiran","doi":"10.1109/APPEEC.2017.8308963","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308963","url":null,"abstract":"This paper presents a new concept for calculating electricity price for electrical vehicles by establishing congestion pricing through the development of locational marginal pricing strategy. The proposed electricity pricing strategy can be used by Individual System Operators whom do not have a feasible resolution aimed at electricity congestion at the moment. This research suggests regulation of electricity pricing of electrical vehicle consumption. In this research, three power flow market analysis with electrical vehicles are simulated and compared by using Power World Simulator. Furthermore, the parameters such as power, current, voltage and charging price are extracted from Power World software and used in the proposed methodology (i.e. distribution locational marginal price) for deciding electricity prices. Collectively, a novel concept is presented for electric vehicles. This concept can be commercialized through a proposition to Energy Market Authority or Individual System Operator by highlighting the affordable price points while easing congestion of transmission lines. For ease of consumer usage, a mobile application has been developed to show the charging prices and corresponding charging locations for electrical vehicles.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126864749","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308998
Anoop V Eluvathingal, K. Swarup
Large scale integration of distributed generating sources challenges the conventional protection schemes in the distribution networks. The response of inverter interfaced sources to network faults are different from the conventional generators and hence need special protection systems. A new protection methodology for distribution networks with inverter based sources is discussed in the present work. The proposed interface protection relay algorithm uses instantaneous symmetrical voltage components for fault detection. The effectiveness of proposed relay algorithm is evaluated by conducting simulation studies using PSCAD/EMTDC software.
{"title":"An interface protection relay for networked microgrids with inverter based sources","authors":"Anoop V Eluvathingal, K. Swarup","doi":"10.1109/APPEEC.2017.8308998","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308998","url":null,"abstract":"Large scale integration of distributed generating sources challenges the conventional protection schemes in the distribution networks. The response of inverter interfaced sources to network faults are different from the conventional generators and hence need special protection systems. A new protection methodology for distribution networks with inverter based sources is discussed in the present work. The proposed interface protection relay algorithm uses instantaneous symmetrical voltage components for fault detection. The effectiveness of proposed relay algorithm is evaluated by conducting simulation studies using PSCAD/EMTDC software.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122520233","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308915
S. Fan, G. He, Bingqing Guo, Zhihua Wang
The economic dispatch of a microgrid is usually modeled as an optimization problem. In much of the literature, controllable loads of users are gathered and regarded as virtual power plants and become a part of the economic dispatch in order to minimize costs and maximize consumption of renewable energy. However, the cost function of different users at different times is difficult to determine because of incomplete information regarding users. To this end, this paper proposes a microgrid economic dispatch approach based on a user energy management system (UEMS). Each UEMS of the users schedules controllable loads based on the received day-ahead price curve to minimize costs greedily. A microgrid control center (MGCC) gathers the load profiles from each UEMS and solves the dynamic optimization power flow (DOPF) problem. The day-ahead price is determined by the marginal cost and acts as a virtual hand to coordinate the MGCC and UEMS. In addition, as an example of a typical controllable load, a schedule model for inverter air conditioner is proposed. A numerical example shows that this approach can minimize overall costs and promote the consumption of renewable energy.
{"title":"A user energy management system (UEMS)-based microgrid economic dispatch model","authors":"S. Fan, G. He, Bingqing Guo, Zhihua Wang","doi":"10.1109/APPEEC.2017.8308915","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308915","url":null,"abstract":"The economic dispatch of a microgrid is usually modeled as an optimization problem. In much of the literature, controllable loads of users are gathered and regarded as virtual power plants and become a part of the economic dispatch in order to minimize costs and maximize consumption of renewable energy. However, the cost function of different users at different times is difficult to determine because of incomplete information regarding users. To this end, this paper proposes a microgrid economic dispatch approach based on a user energy management system (UEMS). Each UEMS of the users schedules controllable loads based on the received day-ahead price curve to minimize costs greedily. A microgrid control center (MGCC) gathers the load profiles from each UEMS and solves the dynamic optimization power flow (DOPF) problem. The day-ahead price is determined by the marginal cost and acts as a virtual hand to coordinate the MGCC and UEMS. In addition, as an example of a typical controllable load, a schedule model for inverter air conditioner is proposed. A numerical example shows that this approach can minimize overall costs and promote the consumption of renewable energy.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116857973","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308918
Nana Li
With the development of power electronic technology, the DC Micro-grid has been paid more and more attention with its powerful energy saving advantages. In this paper, taking the DC Micro-grid composed of photovoltaic generation, energy storage device, DC transformer and load as the research object. Considering three operation modes of grid-connected operation, isolated island operation and smooth switch, the operating modes of the system is designed, the control strategies of the Micro-grid is studied. The DC transformer equivalent model is given to solve the problems about the long simulation step, numbers of computing nodes, lower simulation efficiency. Finally, the simulation platform is built to verify the effectiveness of the system, the feasible of the DC transformer equivalent model.
{"title":"Research on the operation control strategy for the DC micro-grid based on the DCT equivalent model","authors":"Nana Li","doi":"10.1109/APPEEC.2017.8308918","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308918","url":null,"abstract":"With the development of power electronic technology, the DC Micro-grid has been paid more and more attention with its powerful energy saving advantages. In this paper, taking the DC Micro-grid composed of photovoltaic generation, energy storage device, DC transformer and load as the research object. Considering three operation modes of grid-connected operation, isolated island operation and smooth switch, the operating modes of the system is designed, the control strategies of the Micro-grid is studied. The DC transformer equivalent model is given to solve the problems about the long simulation step, numbers of computing nodes, lower simulation efficiency. Finally, the simulation platform is built to verify the effectiveness of the system, the feasible of the DC transformer equivalent model.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129604905","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308949
Pradeep Kumar Reddy Manigilla, N. K. Sharma, S. Samantaray
Increase in power demand calls for increase in number of generating stations and interconnections. Microgrid is a novel architecture that utilizes renewable energy resources to meet this increase in power demand. In a Microgrid, power generation is distributed among various small units called Distributed generators (DGs). When a DG is integrated, it causes few protection issues like increase in fault current levels and under reaching of over current relays. Fault current limiters can be used to limit increased fault currents. Under reaching of over current relays can be avoided using adaptive relaying techniques but to implement these methods present relays have to be replaced. Placing a Superconducting Fault Current (SFCL) in series with DG reduces increased fault levels and also avoids under reaching of over current relays. A SFCL in series with DG can reduce the impact of DG on protection equipment. Thus a SFCL can cloud the presence of DG without the need for changing entire protection system.
{"title":"Application of superconducting fault current limiter to cloud the presence of distributed generation","authors":"Pradeep Kumar Reddy Manigilla, N. K. Sharma, S. Samantaray","doi":"10.1109/APPEEC.2017.8308949","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308949","url":null,"abstract":"Increase in power demand calls for increase in number of generating stations and interconnections. Microgrid is a novel architecture that utilizes renewable energy resources to meet this increase in power demand. In a Microgrid, power generation is distributed among various small units called Distributed generators (DGs). When a DG is integrated, it causes few protection issues like increase in fault current levels and under reaching of over current relays. Fault current limiters can be used to limit increased fault currents. Under reaching of over current relays can be avoided using adaptive relaying techniques but to implement these methods present relays have to be replaced. Placing a Superconducting Fault Current (SFCL) in series with DG reduces increased fault levels and also avoids under reaching of over current relays. A SFCL in series with DG can reduce the impact of DG on protection equipment. Thus a SFCL can cloud the presence of DG without the need for changing entire protection system.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127041607","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 : 2017-11-01DOI: 10.1109/APPEEC.2017.8308971
Ashish Patel, Hitesh Datt Mathur, S. Bhanot
This paper proposes a simple control technique for Distributed Generation fed Unified Power Quality Conditioner (UPQCdg) in presence of unbalanced load. Compensation of unbalanced load causes second order ripples in DC link voltage of UPQCdg, which leads to ripples in reference current estimated by PI controller, and eventually unbalance & harmonics in source currents. This paper proposes use of a mean block at output of PI controller to prevent ripples passing onto reference current. Selection criterion of proposed mean block is discussed. Also, a ‘percentage unbalance’ parameter is proposed for computing unbalance in three phase quantities and comparing among different cases. Performance of proposed technique is validated using Real Time Digital Simulation (RTDS) in Opal-RT. Steady state performance of proposed technique is verified in presence of non-linear and unbalanced loads, and dynamic performance is tested during voltage sag, swell, change in load and variation in solar irradiation. RTDS results express superiority of proposed method over conventional one.
{"title":"A simple approach to improvement in performance of UPQCin presence of unbalanced load","authors":"Ashish Patel, Hitesh Datt Mathur, S. Bhanot","doi":"10.1109/APPEEC.2017.8308971","DOIUrl":"https://doi.org/10.1109/APPEEC.2017.8308971","url":null,"abstract":"This paper proposes a simple control technique for Distributed Generation fed Unified Power Quality Conditioner (UPQCdg) in presence of unbalanced load. Compensation of unbalanced load causes second order ripples in DC link voltage of UPQCdg, which leads to ripples in reference current estimated by PI controller, and eventually unbalance & harmonics in source currents. This paper proposes use of a mean block at output of PI controller to prevent ripples passing onto reference current. Selection criterion of proposed mean block is discussed. Also, a ‘percentage unbalance’ parameter is proposed for computing unbalance in three phase quantities and comparing among different cases. Performance of proposed technique is validated using Real Time Digital Simulation (RTDS) in Opal-RT. Steady state performance of proposed technique is verified in presence of non-linear and unbalanced loads, and dynamic performance is tested during voltage sag, swell, change in load and variation in solar irradiation. RTDS results express superiority of proposed method over conventional one.","PeriodicalId":247669,"journal":{"name":"2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129076636","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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