Pub Date : 2015-10-01DOI: 10.1109/EPEC.2015.7379998
J. Makaran
The following paper presents an approach to gate charge control of a MOSFET used in low-side drive motor applications using pulse width modulation (PWM). Without gate charge control, ringing caused by di/dt effects on turn-on and dv/dt effects during the turn-off can result in narrowband radiated EMI that is very difficult to suppress. Suppressing narrowband EMI through the addition of suppression components can add cost and bulk to the controller. A simple, cost-effective solution based on discrete current control during MOSFET switching transitions is presented based on the observation of the forward and reverse recovery behavior of the freewheeling diode. The efficacy of this approach in mitigating narrowband radiated EMI emissions is presented through an analysis of circuit operation and simulation.
{"title":"MOSFET gate charge control through observation of diode forward and reverse recovery behaviour","authors":"J. Makaran","doi":"10.1109/EPEC.2015.7379998","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379998","url":null,"abstract":"The following paper presents an approach to gate charge control of a MOSFET used in low-side drive motor applications using pulse width modulation (PWM). Without gate charge control, ringing caused by di/dt effects on turn-on and dv/dt effects during the turn-off can result in narrowband radiated EMI that is very difficult to suppress. Suppressing narrowband EMI through the addition of suppression components can add cost and bulk to the controller. A simple, cost-effective solution based on discrete current control during MOSFET switching transitions is presented based on the observation of the forward and reverse recovery behavior of the freewheeling diode. The efficacy of this approach in mitigating narrowband radiated EMI emissions is presented through an analysis of circuit operation and simulation.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133728168","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379999
Ahmed H. Al-Mubarak, M. H. Khan, Moayed Z. Al-Kadhem
The Saudi Electricity Company (SEC) intends to improve the rapid reactive power voltage support in the Kingdom by installing several Static VAR Compensator systems in the transmission network as a part of the Dynamic Reactive Power Compensation (DRPC) project. This article relates to the 450 MVAr (capacitive) to 150 MVAr (inductive) DRPC to be installed at the Qaisumah substation at 115kV level. The requirement for SVC in the Qaisumah region is based on the reactive power support to maintain the post fault voltages at the pre-fault values and prevent from voltage collapse due to the contingency conditions and SLG fault. The proposed DRPC must provide reactive power support during different network disturbances and accelerate the voltage recovery process. The machine model available in the PSS/E library will be used in this article as a SVC model. In this article, the power system and SVC model is constructed in Power System Simulator for Engineers (PSS/E) environment. The result of this article shows that the use of SVC make good impact on damping the system oscillations and provide the good voltage profile as compare to without SVC.
{"title":"Dynamic Reactive Power Compensation for voltage support using Static VAR Compensator (SVC) In Saudi Arabia","authors":"Ahmed H. Al-Mubarak, M. H. Khan, Moayed Z. Al-Kadhem","doi":"10.1109/EPEC.2015.7379999","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379999","url":null,"abstract":"The Saudi Electricity Company (SEC) intends to improve the rapid reactive power voltage support in the Kingdom by installing several Static VAR Compensator systems in the transmission network as a part of the Dynamic Reactive Power Compensation (DRPC) project. This article relates to the 450 MVAr (capacitive) to 150 MVAr (inductive) DRPC to be installed at the Qaisumah substation at 115kV level. The requirement for SVC in the Qaisumah region is based on the reactive power support to maintain the post fault voltages at the pre-fault values and prevent from voltage collapse due to the contingency conditions and SLG fault. The proposed DRPC must provide reactive power support during different network disturbances and accelerate the voltage recovery process. The machine model available in the PSS/E library will be used in this article as a SVC model. In this article, the power system and SVC model is constructed in Power System Simulator for Engineers (PSS/E) environment. The result of this article shows that the use of SVC make good impact on damping the system oscillations and provide the good voltage profile as compare to without SVC.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":" 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114051153","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379943
A. Eajal, E. El-Saadany, M. Shaaban, K. Ponnambalam
This paper presents stochastic energy management system (S-EMS) in hybrid ac/dc smart grids. The developed S-EMS coordinates the operations of various distributed resources (DRs), i.e., distributed generators (DGs) and energy storage systems (ESSs). It also ensures coordinated charging of the plug-in electric vehicles (PEVs). The energy management problem is formulated as a two-stage day-ahead resource scheduling problem with both the intermittent supply and the variable PEV demand modeled as random variables. The first-stage determines the unit commitment (UC) decisions for the next 24 hours, while the second-stage determines the corrective decisions, which include the import/export schedule, the storage charging/discharging cycles, and the PEV charging patterns for a set of possible scenarios. The objective is to minimize the expected total operating cost while satisfying the operational and technical constraints. The developed centralized two-stage stochastic EMS model is tested on a 38-bus hybrid ac/dc distribution system. The simulation results demonstrate the effectiveness of the developed EMS model to optimally coordinate the various components of the future hybrid ac/dc smart grid.
{"title":"Stochastic energy coordination in hybrid AC/DC smart grids","authors":"A. Eajal, E. El-Saadany, M. Shaaban, K. Ponnambalam","doi":"10.1109/EPEC.2015.7379943","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379943","url":null,"abstract":"This paper presents stochastic energy management system (S-EMS) in hybrid ac/dc smart grids. The developed S-EMS coordinates the operations of various distributed resources (DRs), i.e., distributed generators (DGs) and energy storage systems (ESSs). It also ensures coordinated charging of the plug-in electric vehicles (PEVs). The energy management problem is formulated as a two-stage day-ahead resource scheduling problem with both the intermittent supply and the variable PEV demand modeled as random variables. The first-stage determines the unit commitment (UC) decisions for the next 24 hours, while the second-stage determines the corrective decisions, which include the import/export schedule, the storage charging/discharging cycles, and the PEV charging patterns for a set of possible scenarios. The objective is to minimize the expected total operating cost while satisfying the operational and technical constraints. The developed centralized two-stage stochastic EMS model is tested on a 38-bus hybrid ac/dc distribution system. The simulation results demonstrate the effectiveness of the developed EMS model to optimally coordinate the various components of the future hybrid ac/dc smart grid.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125754386","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379979
A. Safaee, K. Woronowicz, Tim R. Dickson
Inductive power transfer becomes increasingly more popular as a method for contact less charging of high power loads. Enabled by the rapid progress in power electronics components and controls, the power transfer solutions cross the previously unattainable boundaries of power levels and cost limits. Because of the high frequencies necessary for voltage induction in the secondary parts of the transformers and because of a rather low magnetic coupling, the system would have to constantly supply high levels of the reactive power, generating very high losses and limiting the available output power. Various tuning techniques have developed to tune-out the reactive power. In this paper a systematic approach to tuning of a high power three phase coupled transformer is presented and arithmetical calculations backed by simulation utilizing its values from the electromagnetic FEA analysis. The approach is based on the fundamental frequency approximation neglecting the higher order harmonics which is valid for tuning the system at the fundamental harmonics of the switching frequency.
{"title":"Reactive power compensation in three phase high output inductive power transfer","authors":"A. Safaee, K. Woronowicz, Tim R. Dickson","doi":"10.1109/EPEC.2015.7379979","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379979","url":null,"abstract":"Inductive power transfer becomes increasingly more popular as a method for contact less charging of high power loads. Enabled by the rapid progress in power electronics components and controls, the power transfer solutions cross the previously unattainable boundaries of power levels and cost limits. Because of the high frequencies necessary for voltage induction in the secondary parts of the transformers and because of a rather low magnetic coupling, the system would have to constantly supply high levels of the reactive power, generating very high losses and limiting the available output power. Various tuning techniques have developed to tune-out the reactive power. In this paper a systematic approach to tuning of a high power three phase coupled transformer is presented and arithmetical calculations backed by simulation utilizing its values from the electromagnetic FEA analysis. The approach is based on the fundamental frequency approximation neglecting the higher order harmonics which is valid for tuning the system at the fundamental harmonics of the switching frequency.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126058399","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379927
S. A. Raza, R. Varma
This paper presents a coordinated control of a STATCOM and a Power System Stabilizer (PSS) for damping the low frequency electromechanical oscillations in a single machine infinite bus (SMIB) system. A model is developed which is subsequently linearized to form a state space model. The STATCOM control is based on modulation index and the phase angle control through pulse width modulation (PWM) technique. The controller parameters both for STATCOM and PSS are optimized using particle swarm optimization (PSO) algorithm using an eigenvalue based objective function. The optimized gains are then used in non-linear simulations developed in MATLAB to demonstrate the effectiveness of different control methodologies.
{"title":"Coordinated control of STATCOM and PSS for damping generator electromechanical oscillations","authors":"S. A. Raza, R. Varma","doi":"10.1109/EPEC.2015.7379927","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379927","url":null,"abstract":"This paper presents a coordinated control of a STATCOM and a Power System Stabilizer (PSS) for damping the low frequency electromechanical oscillations in a single machine infinite bus (SMIB) system. A model is developed which is subsequently linearized to form a state space model. The STATCOM control is based on modulation index and the phase angle control through pulse width modulation (PWM) technique. The controller parameters both for STATCOM and PSS are optimized using particle swarm optimization (PSO) algorithm using an eigenvalue based objective function. The optimized gains are then used in non-linear simulations developed in MATLAB to demonstrate the effectiveness of different control methodologies.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115283113","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379955
Samy Akkari, Jing Dai, Marc Petit, P. Rault, Xavier Guillaud
In this paper, the state-space model of a VSC-MTDC system is derived from individual components and a modified PI section model for cables is proposed which considers both core and screen conductors as well as their coupling. A modal analysis performed on the complete system reveals the influence of each component on the system modes and permits the identification of a dominant DC voltage mode. This mode has proved to be largely affected by the energy storage level of the DC grid, and to be predominantly influenced by the voltage-droop parameters of the converters, meaning that the DC voltage dynamic of the MTDC system can be imposed thanks to a judicious choice of the voltage-droop parameters.
{"title":"Small-signal modelling for in-depth modal analysis of an MTDC system","authors":"Samy Akkari, Jing Dai, Marc Petit, P. Rault, Xavier Guillaud","doi":"10.1109/EPEC.2015.7379955","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379955","url":null,"abstract":"In this paper, the state-space model of a VSC-MTDC system is derived from individual components and a modified PI section model for cables is proposed which considers both core and screen conductors as well as their coupling. A modal analysis performed on the complete system reveals the influence of each component on the system modes and permits the identification of a dominant DC voltage mode. This mode has proved to be largely affected by the energy storage level of the DC grid, and to be predominantly influenced by the voltage-droop parameters of the converters, meaning that the DC voltage dynamic of the MTDC system can be imposed thanks to a judicious choice of the voltage-droop parameters.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114895544","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379923
Y. Assolami, W. Morsi
This paper focuses on investigating the impact of second generation plug-in battery electric vehicles (SGPBEVs) charging on transformer' insulation life. The study considered differed penetrations of SGPBEVs Charging the vehicles (i.e. 0%, 100%, and 200%) and two charging levels (i.e., level 1 and level 2). The time of use (TOU) prices in Ontario Canada are used to mitigate such impact by quantifying the loss of life of transformer's insulation when SGPBEVs are charged at 7PM versus 12 AM respectively.
{"title":"Mitigating the impact of Charging second generation plug-in battery electric vehicles on distribution transformer's insulation life using TOU prices","authors":"Y. Assolami, W. Morsi","doi":"10.1109/EPEC.2015.7379923","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379923","url":null,"abstract":"This paper focuses on investigating the impact of second generation plug-in battery electric vehicles (SGPBEVs) charging on transformer' insulation life. The study considered differed penetrations of SGPBEVs Charging the vehicles (i.e. 0%, 100%, and 200%) and two charging levels (i.e., level 1 and level 2). The time of use (TOU) prices in Ontario Canada are used to mitigate such impact by quantifying the loss of life of transformer's insulation when SGPBEVs are charged at 7PM versus 12 AM respectively.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"396 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114920230","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379980
Yoon-Geon Kim, Nathan Terschak
This paper presents programmable DC-DC converter modules which provide stable power to drive multiple high-power LEDs. When high-power LEDs are used to form a light source, which consists of various types of intensity and wavelengths, DC-DC converter modules can be used to drive the LEDs which then provide optical energy to test photovoltaic cells. To provide similar optical spectrums as seen by solar rays, the power supply for each LED will need to supply a specific voltage and current accordingly. The described module consists of a programmable controller and DC-DC power converters. Each controller manages three DC-DC converters by adjusting the feedback resistances of the converters through a microcontroller. Additional modules can be added to drive an LED array of any size. To verify the operation and performance, a prototype of six modules consisting of eighteen DC-DC converters has been built and tested. The results show that all of eighteen individual LEDs are successfully driven by six modules and eighteen converters.
{"title":"Development of a programmable DC-DC converter module for driving a scalable LED array","authors":"Yoon-Geon Kim, Nathan Terschak","doi":"10.1109/EPEC.2015.7379980","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379980","url":null,"abstract":"This paper presents programmable DC-DC converter modules which provide stable power to drive multiple high-power LEDs. When high-power LEDs are used to form a light source, which consists of various types of intensity and wavelengths, DC-DC converter modules can be used to drive the LEDs which then provide optical energy to test photovoltaic cells. To provide similar optical spectrums as seen by solar rays, the power supply for each LED will need to supply a specific voltage and current accordingly. The described module consists of a programmable controller and DC-DC power converters. Each controller manages three DC-DC converters by adjusting the feedback resistances of the converters through a microcontroller. Additional modules can be added to drive an LED array of any size. To verify the operation and performance, a prototype of six modules consisting of eighteen DC-DC converters has been built and tested. The results show that all of eighteen individual LEDs are successfully driven by six modules and eighteen converters.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116975941","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379928
M. Nassar, R. El Shatshat, M. Salama
This paper studies the effect of different DC-link's parameters on the magnitude of peak fault current in the DC link. Formulae are presented to calculate the peak fault current. These formulae are presented for different controller's response time considering/neglecting source inductance (overlap). This paper proposes two algorithms to calculate the peak fault current, based on the results obtained, an approximate formula is derived to give an estimate for the peak fault current for different pre-fault current values. Also, a generic algorithm is proposed to calculate the peak fault current accurately for a delayed or an instantaneous controller action considering or neglecting source reactance.
{"title":"A generic algorithm for peak fault current calculation in HVDC links","authors":"M. Nassar, R. El Shatshat, M. Salama","doi":"10.1109/EPEC.2015.7379928","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379928","url":null,"abstract":"This paper studies the effect of different DC-link's parameters on the magnitude of peak fault current in the DC link. Formulae are presented to calculate the peak fault current. These formulae are presented for different controller's response time considering/neglecting source inductance (overlap). This paper proposes two algorithms to calculate the peak fault current, based on the results obtained, an approximate formula is derived to give an estimate for the peak fault current for different pre-fault current values. Also, a generic algorithm is proposed to calculate the peak fault current accurately for a delayed or an instantaneous controller action considering or neglecting source reactance.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114385630","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 : 2015-10-01DOI: 10.1109/EPEC.2015.7379933
S. Craig, B. Venkatesh, P. Yu
A need exists to optimally dispatch power generation to meet hourly demands on the power grid. This is a well-documented and well-established problem commonly known as Unit Commitment (UC). It is typically formulated as a Mixed Integer Program (MIP), which utilizes modern advancements in solver intelligence to produce a solution with speed and accuracy. However, the MIP formulation suffers from a discreted soution space, in which UC problems cannot be differentiated and solved by regular tools.
{"title":"A proof-of-concept approach to Unit Commitment using the theory of complementarity","authors":"S. Craig, B. Venkatesh, P. Yu","doi":"10.1109/EPEC.2015.7379933","DOIUrl":"https://doi.org/10.1109/EPEC.2015.7379933","url":null,"abstract":"A need exists to optimally dispatch power generation to meet hourly demands on the power grid. This is a well-documented and well-established problem commonly known as Unit Commitment (UC). It is typically formulated as a Mixed Integer Program (MIP), which utilizes modern advancements in solver intelligence to produce a solution with speed and accuracy. However, the MIP formulation suffers from a discreted soution space, in which UC problems cannot be differentiated and solved by regular tools.","PeriodicalId":231255,"journal":{"name":"2015 IEEE Electrical Power and Energy Conference (EPEC)","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124508959","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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