Pub Date : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980670
R. Melício, V. Mendes, H. Pousinho, M. Seixas
A new integrated mathematical model for the simulation of offshore wind energy conversion system performance is presented in this paper. The mathematical model considers an offshore variable-speed turbine in deep water equipped with a permanent magnet synchronous generator using full-power two-level converter, converting the energy of a variable frequency source in injected energy into the electric network with constant frequency, through a high voltage DC transmission submarine cable. The mathematical model for the drive train is a concentrate two mass model which incorporates the dynamic for the structure and tower due to the need to emulate the effects of the moving surface. Controller strategy considered is a proportional integral one. Also, pulse width modulation using space vector modulation supplemented with sliding mode is used for trigger the transistor of the converter. Finally, a case study is presented to access the system performance.
{"title":"Simulation of offshore wind system with two-level converters: HVDC power transmission","authors":"R. Melício, V. Mendes, H. Pousinho, M. Seixas","doi":"10.1109/EPEPEMC.2014.6980670","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980670","url":null,"abstract":"A new integrated mathematical model for the simulation of offshore wind energy conversion system performance is presented in this paper. The mathematical model considers an offshore variable-speed turbine in deep water equipped with a permanent magnet synchronous generator using full-power two-level converter, converting the energy of a variable frequency source in injected energy into the electric network with constant frequency, through a high voltage DC transmission submarine cable. The mathematical model for the drive train is a concentrate two mass model which incorporates the dynamic for the structure and tower due to the need to emulate the effects of the moving surface. Controller strategy considered is a proportional integral one. Also, pulse width modulation using space vector modulation supplemented with sliding mode is used for trigger the transistor of the converter. Finally, a case study is presented to access the system performance.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123277905","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980512
L. Tutelea, S. Deaconu, G. Popa
This paper analyses two running regimes of low speed twin stator windings induction generator (TSWIG), directly coupled to the shaft of the wind turbine. A single low cost (reduced power) active rectifier is used to deliver the energy to the dc grid for a large shaft speed variation. At the rated speed, the capacitor battery supplies the induction generator with entire reactive power reducing this way the apparent power of the active rectifier. When the turbine speed decreases, the capacitor battery capability also decreases but the active rectifier (inverter) could assist the generator magnetization because the turbine power reduction relieves the active power of the active rectifier. The paper also investigates the self excitation of the stand alone TSWIG in an emergency regime. Digital simulation proves the self excitation at rated wind speed as well at low wind speed with power limitation.
{"title":"Reduced cost low speed wind or hydro energy conversion system with twin stator windings induction generator","authors":"L. Tutelea, S. Deaconu, G. Popa","doi":"10.1109/EPEPEMC.2014.6980512","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980512","url":null,"abstract":"This paper analyses two running regimes of low speed twin stator windings induction generator (TSWIG), directly coupled to the shaft of the wind turbine. A single low cost (reduced power) active rectifier is used to deliver the energy to the dc grid for a large shaft speed variation. At the rated speed, the capacitor battery supplies the induction generator with entire reactive power reducing this way the apparent power of the active rectifier. When the turbine speed decreases, the capacitor battery capability also decreases but the active rectifier (inverter) could assist the generator magnetization because the turbine power reduction relieves the active power of the active rectifier. The paper also investigates the self excitation of the stand alone TSWIG in an emergency regime. Digital simulation proves the self excitation at rated wind speed as well at low wind speed with power limitation.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"294 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120923735","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980529
S. Ohashi, M. Yoshida, T. Yokoyama
Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. To adopt to the fault ride through (FRT) conditions, deadbeat control was introduced to control the output current, and variable carrier method was applied to achieve high efficiency without the deterioration of controllability of the output current. The disturbance compensator was also implemented to achieve the superior tracking accuracy to the reference current. Design concept of SoC-FPGA based hardware controller was described and the verifications of the proposed method were carried out through simulations and experiments.
{"title":"Verification of variable carrier deadbeat control with digital hysteresis method using SoC-FPGA for utility interactive inverter for FRT conditions","authors":"S. Ohashi, M. Yoshida, T. Yokoyama","doi":"10.1109/EPEPEMC.2014.6980529","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980529","url":null,"abstract":"Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. To adopt to the fault ride through (FRT) conditions, deadbeat control was introduced to control the output current, and variable carrier method was applied to achieve high efficiency without the deterioration of controllability of the output current. The disturbance compensator was also implemented to achieve the superior tracking accuracy to the reference current. Design concept of SoC-FPGA based hardware controller was described and the verifications of the proposed method were carried out through simulations and experiments.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121356521","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980558
S. D'arco, J. Suul, M. Molinas
This paper proposes a simple method for damping of oscillations in dc grids based on Voltage Source Converters (VSCs). The damping effect is achieved by a control loop for counteracting measured dc voltage oscillations by acting on the active current reference of the ac-side VSC controller. The design of the damping method is supported by participation factor analysis and parametric sensitivities of a small-signal model representing an investigated test case. This investigated system is consisting of a single HVDC converter station connected to a dc cable equivalent and an ac grid. The validity of the developed small-signal model is verified by comparison to a simulation model including nonlinear effects of the investigated converter configuration. The small-signal model is then used to analyze the stability and dynamic characteristics of the system with and without the proposed active damping and to identify a suitable tuning of the damping controller.
{"title":"Implementation and analysis of a control scheme for damping of oscillations in VSC-based HVDC grids","authors":"S. D'arco, J. Suul, M. Molinas","doi":"10.1109/EPEPEMC.2014.6980558","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980558","url":null,"abstract":"This paper proposes a simple method for damping of oscillations in dc grids based on Voltage Source Converters (VSCs). The damping effect is achieved by a control loop for counteracting measured dc voltage oscillations by acting on the active current reference of the ac-side VSC controller. The design of the damping method is supported by participation factor analysis and parametric sensitivities of a small-signal model representing an investigated test case. This investigated system is consisting of a single HVDC converter station connected to a dc cable equivalent and an ac grid. The validity of the developed small-signal model is verified by comparison to a simulation model including nonlinear effects of the investigated converter configuration. The small-signal model is then used to analyze the stability and dynamic characteristics of the system with and without the proposed active damping and to identify a suitable tuning of the damping controller.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121766577","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980518
K. Boulaam, A. Boukhelifa
In this paper, a fuzzy sliding mode control algorithm is proposed to improve performances of a variable speed wind energy conversion system (WECS) connected to the grid. To reduce the converter size, a doubly fed induction generator (DFIG) is used. Using a DFIG offers also the possibility to its stator active and reactive powers to be controlled independently. The active power reference is obtained by applying the maximum power point tracking (MPPT) strategy based on speed control technique. The combination of sliding mode and fuzzy logic permits to enjoy the benefits of these two methods. The proposed approach is tested in Simulink/Matlab environment. The simulation results show good performances of the global conversion system.
{"title":"Fuzzy sliding mode control of DFIG power for a wind conversion system","authors":"K. Boulaam, A. Boukhelifa","doi":"10.1109/EPEPEMC.2014.6980518","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980518","url":null,"abstract":"In this paper, a fuzzy sliding mode control algorithm is proposed to improve performances of a variable speed wind energy conversion system (WECS) connected to the grid. To reduce the converter size, a doubly fed induction generator (DFIG) is used. Using a DFIG offers also the possibility to its stator active and reactive powers to be controlled independently. The active power reference is obtained by applying the maximum power point tracking (MPPT) strategy based on speed control technique. The combination of sliding mode and fuzzy logic permits to enjoy the benefits of these two methods. The proposed approach is tested in Simulink/Matlab environment. The simulation results show good performances of the global conversion system.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127749375","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980686
A. Kaszewski, Andrzej Gałecki, B. Ufnalski, L. Grzesiak
This paper presents a control strategy for four-leg grid-connected PWM rectifiers that have an active power filtering function. The four-leg voltage source converter topology gives ability to control an input current in the neutral leg. That is important for the active power filtering function when there is an unbalanced load. The control strategy is based on a voltage oriented method that has a cascaded DC voltage and current controllers designed in a rotating reference frame. The DC voltage controller is a PI-type, whereas the input current is shaped by a full-state feedback controller. The novelty of the proposed solution is the control structure that has modified the DC voltage error signal by adding a discontinuity element and reduction the number of current signals by half. The discontinuity element is needed to provide a constant reference current signal during active power filtering operation. The paper describes in detail the design procedure for the voltage and current controllers. Numerical results for active rectification and active power filtering operations are presented and discussed. Numerical results have been obtained by using a discrete control model.
{"title":"State-space current control for four-leg grid-connected PWM rectifiers with active power filtering function","authors":"A. Kaszewski, Andrzej Gałecki, B. Ufnalski, L. Grzesiak","doi":"10.1109/EPEPEMC.2014.6980686","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980686","url":null,"abstract":"This paper presents a control strategy for four-leg grid-connected PWM rectifiers that have an active power filtering function. The four-leg voltage source converter topology gives ability to control an input current in the neutral leg. That is important for the active power filtering function when there is an unbalanced load. The control strategy is based on a voltage oriented method that has a cascaded DC voltage and current controllers designed in a rotating reference frame. The DC voltage controller is a PI-type, whereas the input current is shaped by a full-state feedback controller. The novelty of the proposed solution is the control structure that has modified the DC voltage error signal by adding a discontinuity element and reduction the number of current signals by half. The discontinuity element is needed to provide a constant reference current signal during active power filtering operation. The paper describes in detail the design procedure for the voltage and current controllers. Numerical results for active rectification and active power filtering operations are presented and discussed. Numerical results have been obtained by using a discrete control model.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128017504","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980586
V. V. Aban, A. Hava
In this study, the input filter design and dc-bus voltage control of ac motor drives utilizing low capacitance film capacitor are investigated. The dc-bus voltage instability problem arising due to the resonance between the dc-bus capacitor and circuit inductances is explained. A dimensioning algorithm of dc-bus filter components for stable operation is given. The simulation results of the low capacitance motor drives with and without dc-link inductor are provided to observe the stability of the dc-bus at different resonant frequencies. Voltage and current mode active stabilization methods found in literature aiming to actively damp the resonances in the dc-bus are analyzed and evaluated in the simulations for 2.2 kW and 37 kW rated induction motors driving constant torque load (CTL) and variable torque loads (VTL). Results are analyzed both in terms of input (line current) power quality and output (motor motion) quality.
{"title":"Performance analysis, filter component sizing, and controller structure selection of small capacitor diode rectifier front end inverter drives","authors":"V. V. Aban, A. Hava","doi":"10.1109/EPEPEMC.2014.6980586","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980586","url":null,"abstract":"In this study, the input filter design and dc-bus voltage control of ac motor drives utilizing low capacitance film capacitor are investigated. The dc-bus voltage instability problem arising due to the resonance between the dc-bus capacitor and circuit inductances is explained. A dimensioning algorithm of dc-bus filter components for stable operation is given. The simulation results of the low capacitance motor drives with and without dc-link inductor are provided to observe the stability of the dc-bus at different resonant frequencies. Voltage and current mode active stabilization methods found in literature aiming to actively damp the resonances in the dc-bus are analyzed and evaluated in the simulations for 2.2 kW and 37 kW rated induction motors driving constant torque load (CTL) and variable torque loads (VTL). Results are analyzed both in terms of input (line current) power quality and output (motor motion) quality.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133980645","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980589
J. Deskur, T. Pajchrowski, K. Zawirski
The paper presents the problem of obtaining a good dynamics of the PMSM drive with complex mechanical structure and variable moment of inertia. Proposed approach bases on proper design of feedback filter to reduce influence of mechanical resonance's and applying a neural speed controller trained online, which can adapt itself to variable inertia. As an alternative, robust PI controller with set-point weighting is presented. The results of simulation and experimental investigations show good properties of designed control system.
{"title":"Speed controller for a drive with complex mechanical structure and variable parameters","authors":"J. Deskur, T. Pajchrowski, K. Zawirski","doi":"10.1109/EPEPEMC.2014.6980589","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980589","url":null,"abstract":"The paper presents the problem of obtaining a good dynamics of the PMSM drive with complex mechanical structure and variable moment of inertia. Proposed approach bases on proper design of feedback filter to reduce influence of mechanical resonance's and applying a neural speed controller trained online, which can adapt itself to variable inertia. As an alternative, robust PI controller with set-point weighting is presented. The results of simulation and experimental investigations show good properties of designed control system.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125666218","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980647
H. Djeghloud, M. Larakeb, A. Bentounsi, Y. Terriche, D. Kerdoun
Practical and simulation studies of a hybrid system of series active power filter and shunt passive filter is presented in this two-part paper. Whereas part 1 concerns dimensioning, designing and starting up of the shunt passive filter, this second part is dedicated to dimensioning, conceiving and implementing of the series active filter. The works consist mainly to realize a two-level full bridge voltage inverter based on IGBT's. The respective overvoltage circuit and average control circuit are also conceived. The control is conducted in an open loop, the reference signals are identified using the p-q theory concept, and for launching the gating signals, the carrier-based PWM method is employed. The implementation of the whole system gave satisfactory results and improved the quality of power in the main utility side.
{"title":"Laboratory implementation of a hybrid series active power filter system part II: Series active filter designing","authors":"H. Djeghloud, M. Larakeb, A. Bentounsi, Y. Terriche, D. Kerdoun","doi":"10.1109/EPEPEMC.2014.6980647","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980647","url":null,"abstract":"Practical and simulation studies of a hybrid system of series active power filter and shunt passive filter is presented in this two-part paper. Whereas part 1 concerns dimensioning, designing and starting up of the shunt passive filter, this second part is dedicated to dimensioning, conceiving and implementing of the series active filter. The works consist mainly to realize a two-level full bridge voltage inverter based on IGBT's. The respective overvoltage circuit and average control circuit are also conceived. The control is conducted in an open loop, the reference signals are identified using the p-q theory concept, and for launching the gating signals, the carrier-based PWM method is employed. The implementation of the whole system gave satisfactory results and improved the quality of power in the main utility side.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115872461","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 : 2014-12-11DOI: 10.1109/EPEPEMC.2014.6980702
D. Stănescu, P. Nicolae, I. Bojoi
The paper presents an optimization of an indirect vector control strategy for induction motor drives. Based on the mathematic model of the induction motor which considers the iron loss resistance, a control algorithm has been conceived to reduce the difference between the measured and estimated torques. Two cases are presented in the paper. In the first case the iron loss resistance is neglected in the control algorithm, but it is considered in the second case. The indirect vector control algorithm was implemented on a dSPACE DS 1104 platform controlling an inverter fed 2.2 kW induction motor.
{"title":"On the optimization of the rotor flux vector control used in induction motors drive systems","authors":"D. Stănescu, P. Nicolae, I. Bojoi","doi":"10.1109/EPEPEMC.2014.6980702","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2014.6980702","url":null,"abstract":"The paper presents an optimization of an indirect vector control strategy for induction motor drives. Based on the mathematic model of the induction motor which considers the iron loss resistance, a control algorithm has been conceived to reduce the difference between the measured and estimated torques. Two cases are presented in the paper. In the first case the iron loss resistance is neglected in the control algorithm, but it is considered in the second case. The indirect vector control algorithm was implemented on a dSPACE DS 1104 platform controlling an inverter fed 2.2 kW induction motor.","PeriodicalId":325670,"journal":{"name":"2014 16th International Power Electronics and Motion Control Conference and Exposition","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134556445","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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