Pub Date : 2015-06-24DOI: 10.1109/TAPENERGY.2015.7229645
R. Jayakrishnan, V. Sruthy
The modern grid codes for fault ride through specifications in transmission and distribution grids specify that Distributed Generation (DG) must remain connected to the grid even at voltages well below the nominal voltage. This is contrary to the traditional approach, whereby the power plants were not required to stay connected. The reliable operation of the grid during this period is challenging as the inverter based DGs are designed to operate reliably at nominal voltages and does not function well under the abnormal conditions. This paper presents a new fault ride through scheme that limits fault current within the system limits. The microgrid (MG) model considered here is studied under normal and fault situation and a fault analysis on an islanded microgrid with two wind sources and a Photovoltaic (PV) source. Different types of faults are considered at random points to study the effect of fault location and recovery time. A novel control strategy for the interface converter is proposed where a master-slave control is adopted for the sources, which enables the power sharing between the DGs and a fault ride through logic that addresses the fault current limiting is developed. The scheme has been validated with simulation results in MATLAB/Simulink.
{"title":"Fault ride through augmentation of microgrid","authors":"R. Jayakrishnan, V. Sruthy","doi":"10.1109/TAPENERGY.2015.7229645","DOIUrl":"https://doi.org/10.1109/TAPENERGY.2015.7229645","url":null,"abstract":"The modern grid codes for fault ride through specifications in transmission and distribution grids specify that Distributed Generation (DG) must remain connected to the grid even at voltages well below the nominal voltage. This is contrary to the traditional approach, whereby the power plants were not required to stay connected. The reliable operation of the grid during this period is challenging as the inverter based DGs are designed to operate reliably at nominal voltages and does not function well under the abnormal conditions. This paper presents a new fault ride through scheme that limits fault current within the system limits. The microgrid (MG) model considered here is studied under normal and fault situation and a fault analysis on an islanded microgrid with two wind sources and a Photovoltaic (PV) source. Different types of faults are considered at random points to study the effect of fault location and recovery time. A novel control strategy for the interface converter is proposed where a master-slave control is adopted for the sources, which enables the power sharing between the DGs and a fault ride through logic that addresses the fault current limiting is developed. The scheme has been validated with simulation results in MATLAB/Simulink.","PeriodicalId":6552,"journal":{"name":"2015 International Conference on Technological Advancements in Power and Energy (TAP Energy)","volume":"1 1","pages":"357-362"},"PeriodicalIF":0.0,"publicationDate":"2015-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83288718","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}
This paper presents various aspects of optimal Phasor measurement unit (PMU) placement problem with load sensitivity analysis. Binary integer linear programming based methodology for optimal placement of PMU in a given power network for full observability of that network is presented in this paper. First, complete observability of the given network is formulated conventionally and then, zero injection bus constraints are added in conventional formulation. Load sensitivity analysis is done using Newton-Rapson Load flow and most sensitive buses based on load sensitivity analysis, are sorted out. Minimum number of PMU's, less than the optimal number (without considering load sensitivity) are placed such that it covers most sensitive buses and also most of the buses are observed. In this paper optimal PMU placement problem considering sensitivity analysis is presented for IEEE-14 bus and IEEE-30 bus systems.
{"title":"Optimal placement of PMU's considering sensitivity analysis","authors":"Chandrasekhar Yammani, Narsi Reddy K, Sydulu Maheswarapu","doi":"10.1109/TAPENERGY.2015.7229590","DOIUrl":"https://doi.org/10.1109/TAPENERGY.2015.7229590","url":null,"abstract":"This paper presents various aspects of optimal Phasor measurement unit (PMU) placement problem with load sensitivity analysis. Binary integer linear programming based methodology for optimal placement of PMU in a given power network for full observability of that network is presented in this paper. First, complete observability of the given network is formulated conventionally and then, zero injection bus constraints are added in conventional formulation. Load sensitivity analysis is done using Newton-Rapson Load flow and most sensitive buses based on load sensitivity analysis, are sorted out. Minimum number of PMU's, less than the optimal number (without considering load sensitivity) are placed such that it covers most sensitive buses and also most of the buses are observed. In this paper optimal PMU placement problem considering sensitivity analysis is presented for IEEE-14 bus and IEEE-30 bus systems.","PeriodicalId":6552,"journal":{"name":"2015 International Conference on Technological Advancements in Power and Energy (TAP Energy)","volume":"27 1","pages":"40-44"},"PeriodicalIF":0.0,"publicationDate":"2015-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74194303","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 : 2015-06-24DOI: 10.1109/TAPENERGY.2015.7229639
U. C. Chitra, A. Rajendran
Three level neutral point inverter is one of the most popular multilevel inverter used for industrial applications. To improve the control of it, different pulse width modulation techniques like sine triangle PWM, space vector modulation etc are used. Conventional space vector PWM employs switching sequence, which divides the zero vector time equally between the two zero states in every subcycle. Bus-clamping PWM employ clamping sequences, use only one zero state and results in clamping of one phase during the entire duration in a subcycle. Bus clamping technique reduces the switching losses and improves the efficiency and performance of the inverter. The THD has been reduced and output voltage is improved. Simulation of inverter using BCPWM have been done and is applied to a permanent magnet synchronous motor using MATLAB/SIMULINK. The performances have been compared with other techniques.
{"title":"Bus clamping PWM for three level neutral point clamped inverters","authors":"U. C. Chitra, A. Rajendran","doi":"10.1109/TAPENERGY.2015.7229639","DOIUrl":"https://doi.org/10.1109/TAPENERGY.2015.7229639","url":null,"abstract":"Three level neutral point inverter is one of the most popular multilevel inverter used for industrial applications. To improve the control of it, different pulse width modulation techniques like sine triangle PWM, space vector modulation etc are used. Conventional space vector PWM employs switching sequence, which divides the zero vector time equally between the two zero states in every subcycle. Bus-clamping PWM employ clamping sequences, use only one zero state and results in clamping of one phase during the entire duration in a subcycle. Bus clamping technique reduces the switching losses and improves the efficiency and performance of the inverter. The THD has been reduced and output voltage is improved. Simulation of inverter using BCPWM have been done and is applied to a permanent magnet synchronous motor using MATLAB/SIMULINK. The performances have been compared with other techniques.","PeriodicalId":6552,"journal":{"name":"2015 International Conference on Technological Advancements in Power and Energy (TAP Energy)","volume":"63 1","pages":"322-326"},"PeriodicalIF":0.0,"publicationDate":"2015-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84580142","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 : 2015-06-24DOI: 10.1109/TAPENERGY.2015.7229638
T. Renuka, P. Reji
The increasing penetration of variable speed wind turbines in the power system result in the reduction of total system inertia. This requires new methods to control the grid frequency. This paper deals with the primary frequency control of hydro power dominated power system integrated with wind power. The modeling of hydro power units and variable speed wind turbine are done in Matlab/Simulink. The behaviour of grid frequency for various wind speeds and wind penetration levels is analysed when there is a power imbalance. A fuzzy logic based pitch controller is proposed for high wind speed range. Inertia emulation frequency control is added to the wind turbine to improve frequency stability when there is a mismatch between load and generation.
{"title":"Frequency control of wind penetrated hydro-dominated power system","authors":"T. Renuka, P. Reji","doi":"10.1109/TAPENERGY.2015.7229638","DOIUrl":"https://doi.org/10.1109/TAPENERGY.2015.7229638","url":null,"abstract":"The increasing penetration of variable speed wind turbines in the power system result in the reduction of total system inertia. This requires new methods to control the grid frequency. This paper deals with the primary frequency control of hydro power dominated power system integrated with wind power. The modeling of hydro power units and variable speed wind turbine are done in Matlab/Simulink. The behaviour of grid frequency for various wind speeds and wind penetration levels is analysed when there is a power imbalance. A fuzzy logic based pitch controller is proposed for high wind speed range. Inertia emulation frequency control is added to the wind turbine to improve frequency stability when there is a mismatch between load and generation.","PeriodicalId":6552,"journal":{"name":"2015 International Conference on Technological Advancements in Power and Energy (TAP Energy)","volume":"6 1","pages":"316-321"},"PeriodicalIF":0.0,"publicationDate":"2015-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84631795","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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