Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745192
S. Pandya, J. K. Chatterjee
Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over the conventional direct torque control (conventional DTC). SVPWM DTC technique is helpful in solving the basic issues of torque ripple and variable switching frequency present in the conventional DTC. Three PI controllers one each for speed, torque and flux feedback loops is used in SVPWM DTC based IM drive. The major issue related with SVPWM DTC based IM drive is the proper setting of the parameters in speed, torque and flux control loops. As they are inter-dependent in nature, their parameter setting is a tricky issue. No proven technique is available to address this issue and so it can be observed that because of the lack of proper parameter settings, the induction motor drive performance is affected in terms of higher torque ripple. In present work an attempt is made to address this problem using the frequency analysis technique. Simulation results for the SVPWM DTC based on this method and conventional DTC are compared. Hardware results validate the simulation result and hence proposed technique.
{"title":"Torque Ripple Minimization in Direct Torque Control based IM Drive Part-I: Single-rate Control Strategy","authors":"S. Pandya, J. K. Chatterjee","doi":"10.1109/ICPST.2008.4745192","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745192","url":null,"abstract":"Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over the conventional direct torque control (conventional DTC). SVPWM DTC technique is helpful in solving the basic issues of torque ripple and variable switching frequency present in the conventional DTC. Three PI controllers one each for speed, torque and flux feedback loops is used in SVPWM DTC based IM drive. The major issue related with SVPWM DTC based IM drive is the proper setting of the parameters in speed, torque and flux control loops. As they are inter-dependent in nature, their parameter setting is a tricky issue. No proven technique is available to address this issue and so it can be observed that because of the lack of proper parameter settings, the induction motor drive performance is affected in terms of higher torque ripple. In present work an attempt is made to address this problem using the frequency analysis technique. Simulation results for the SVPWM DTC based on this method and conventional DTC are compared. Hardware results validate the simulation result and hence proposed technique.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114113779","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745372
Fengge Zhang, Yuxin Wang, E. Shang
Aiming at the problem to generate difficultly steady electric energy in wind solar hybrid power system (WSHGS), the management and control method based on the battery power control is discussed. The system designed in this paper realizes the control for battery intelligent charging and discharging process by the system software and PIC16F877 signal chip computer. The hardware design scheme is given too in this paper. The emulation of the control system is carried out by simulation tool. The simulation results show that the system controller can manage the batteries charging and discharging well, so the batteries' life will be longer.
{"title":"Design and Realization of Controller in Wind Solar Hybrid Generating System","authors":"Fengge Zhang, Yuxin Wang, E. Shang","doi":"10.1109/ICPST.2008.4745372","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745372","url":null,"abstract":"Aiming at the problem to generate difficultly steady electric energy in wind solar hybrid power system (WSHGS), the management and control method based on the battery power control is discussed. The system designed in this paper realizes the control for battery intelligent charging and discharging process by the system software and PIC16F877 signal chip computer. The hardware design scheme is given too in this paper. The emulation of the control system is carried out by simulation tool. The simulation results show that the system controller can manage the batteries charging and discharging well, so the batteries' life will be longer.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124847871","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745245
Daochun Huang, J. Ruan
The ultra high voltage (UHV) direct current (DC) transmission developments in China are simply introduced in this paper. The demand of UHV DC transmission and development plan in China are simply discussed. The design parameters and construction of UHV DC test bases, including test facilities, the tests that can be carried out; UHV DC test and demonstration lines; design and manufacture of UHV DC equipment are also introduced in this paper.
{"title":"Recent Developments of UHV DC Transmission Research in China","authors":"Daochun Huang, J. Ruan","doi":"10.1109/ICPST.2008.4745245","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745245","url":null,"abstract":"The ultra high voltage (UHV) direct current (DC) transmission developments in China are simply introduced in this paper. The demand of UHV DC transmission and development plan in China are simply discussed. The design parameters and construction of UHV DC test bases, including test facilities, the tests that can be carried out; UHV DC test and demonstration lines; design and manufacture of UHV DC equipment are also introduced in this paper.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122979869","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745208
S. Balagopalan, S. Ashok, K. Mohandas
This paper presents a new set of methodologies and tools to implement multilateral trades in a restructured electricity market. Loss minimization is made an objective, realized through elasticized transmission charge. This charge is designed to acts as a financial instrument that penalizes deviation from least loss formulation. To reduce its impact coalition formation is envisaged in a cooperative game theory environment. Power vectors are derived to guide coalitions. Marginal vectors are used as socially stable pay-off vectors to share the charges. This model that exemplifies an electricity market is proposed as most suitable since all aspects are based on market engineering principles. A five bus power system is used to illustrate the suitability.
{"title":"Power Vector Coordination of Socially Stable Multilateral Trades","authors":"S. Balagopalan, S. Ashok, K. Mohandas","doi":"10.1109/ICPST.2008.4745208","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745208","url":null,"abstract":"This paper presents a new set of methodologies and tools to implement multilateral trades in a restructured electricity market. Loss minimization is made an objective, realized through elasticized transmission charge. This charge is designed to acts as a financial instrument that penalizes deviation from least loss formulation. To reduce its impact coalition formation is envisaged in a cooperative game theory environment. Power vectors are derived to guide coalitions. Marginal vectors are used as socially stable pay-off vectors to share the charges. This model that exemplifies an electricity market is proposed as most suitable since all aspects are based on market engineering principles. A five bus power system is used to illustrate the suitability.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123462215","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745243
Huaren Wu, Qi Wang, Xiaohui Li
A rotor speed of remote generator is used as wide area measurement signal in this paper. The signal is detected and transmitted by the phasor measurement unit (PMU). The wide area signal inputs to the local power system stabilizer (PSS) to regulate the generator excitation and enhancing the power system damping. The gains of the wide area controller are determined by solving linear matrix inequalities (LMI). The LMI solving method is introduced for the wide area control of power systems. A proportional plus derivative network is used to compensate the communication delay. Kundur's four-machine two-area system is used to test the performance of the wide area damping control. The simulation results show that the wide area control can improve power system stability.
{"title":"PMU-Based Wide Area Damping Control of Power Systems","authors":"Huaren Wu, Qi Wang, Xiaohui Li","doi":"10.1109/ICPST.2008.4745243","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745243","url":null,"abstract":"A rotor speed of remote generator is used as wide area measurement signal in this paper. The signal is detected and transmitted by the phasor measurement unit (PMU). The wide area signal inputs to the local power system stabilizer (PSS) to regulate the generator excitation and enhancing the power system damping. The gains of the wide area controller are determined by solving linear matrix inequalities (LMI). The LMI solving method is introduced for the wide area control of power systems. A proportional plus derivative network is used to compensate the communication delay. Kundur's four-machine two-area system is used to test the performance of the wide area damping control. The simulation results show that the wide area control can improve power system stability.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122085358","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745323
J. Zhao, B. Zhang
The interaction and nonlinear relationship between different parameters or groups of parameters always are interested by the operators in control center of power grid. A practical tracing method of two parameter stability boundary for voltage stability assessment is proposed. In the traditional tracing method of two parameter bifurcation boundary a second order Hessian matrix of power flow equations has to be computed and factorized, which is a difficulty for on-line application of a large scale power system. By using the single parameter trajectory tracing and the bifurcation point seeking and identification alternately, with the computational expenses of some additional points, the proposed method handles the Jacobin matrix and overcomes this difficulty. The preposition of the proposed method is that the interested part of two parameter stability boundary is composed of both the saddle node bifurcation points and the limit induced bifurcation points, without double saddle node bifurcation points. It is satisfied since the interested part of the boundary is limited. The numerical results about a 3187 bus actual system show that the proposed method is very efficient for on-line application.
{"title":"A Practical Double-Parameter Steady Voltage Stability Boundary Tracing Method","authors":"J. Zhao, B. Zhang","doi":"10.1109/ICPST.2008.4745323","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745323","url":null,"abstract":"The interaction and nonlinear relationship between different parameters or groups of parameters always are interested by the operators in control center of power grid. A practical tracing method of two parameter stability boundary for voltage stability assessment is proposed. In the traditional tracing method of two parameter bifurcation boundary a second order Hessian matrix of power flow equations has to be computed and factorized, which is a difficulty for on-line application of a large scale power system. By using the single parameter trajectory tracing and the bifurcation point seeking and identification alternately, with the computational expenses of some additional points, the proposed method handles the Jacobin matrix and overcomes this difficulty. The preposition of the proposed method is that the interested part of two parameter stability boundary is composed of both the saddle node bifurcation points and the limit induced bifurcation points, without double saddle node bifurcation points. It is satisfied since the interested part of the boundary is limited. The numerical results about a 3187 bus actual system show that the proposed method is very efficient for on-line application.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122122304","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745263
R. Bharanikumar, R. Senthilkumar, A. Nirmal Kumar
This paper presents a Z-source inverter for wind energy conversion system. The main thrust in wind energy conversion system (WECS) is to maintain a constant voltage at the output in spite of variation in wind velocity. The Z-source inverter has been identified to exhibit in steady-state, both voltage buck-and boost-capabilities. It employs a unique impedance network included between the dc power source and converter circuit. The power conversion efficiency of Z-source inverter is appreciably improved because of the traditional three-stage conversion system, consist of rectifier, boost chopper and inverter, replaced by a two stage conversion systems comprising of rectifier and Z-source inverter. All the traditional pulse width-modulation (PWM) schemes can be used to control the Z-source inverter. When the dc voltage is high enough to generate the desired ac output voltage, normal PWM is used. While the dc voltage is not enough to directly generate a desired output voltage, a modified PWM with shoot-through zero states is employed to boost the voltage. The proposed Z-source inverter with PMG and wind turbine is modeled and simulated using MATLAB/SIMULINK.
{"title":"Impedance Source Inverter for Wind Turbine Driven Permanent Magnet Generator","authors":"R. Bharanikumar, R. Senthilkumar, A. Nirmal Kumar","doi":"10.1109/ICPST.2008.4745263","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745263","url":null,"abstract":"This paper presents a Z-source inverter for wind energy conversion system. The main thrust in wind energy conversion system (WECS) is to maintain a constant voltage at the output in spite of variation in wind velocity. The Z-source inverter has been identified to exhibit in steady-state, both voltage buck-and boost-capabilities. It employs a unique impedance network included between the dc power source and converter circuit. The power conversion efficiency of Z-source inverter is appreciably improved because of the traditional three-stage conversion system, consist of rectifier, boost chopper and inverter, replaced by a two stage conversion systems comprising of rectifier and Z-source inverter. All the traditional pulse width-modulation (PWM) schemes can be used to control the Z-source inverter. When the dc voltage is high enough to generate the desired ac output voltage, normal PWM is used. While the dc voltage is not enough to directly generate a desired output voltage, a modified PWM with shoot-through zero states is employed to boost the voltage. The proposed Z-source inverter with PMG and wind turbine is modeled and simulated using MATLAB/SIMULINK.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125932730","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745150
C. Indulkar
Distributed power generation provides electric power at a site closer to customers. This paper, formulates the problem of optimal utilization of renewable energy options to meet the peak load demand. A Monte Carlo apportioning technique of solar photovoltaic, co-generation, wind power, and small hydro, which considers specific techno-economic constraints, such as capital cost and generation cost constraints, and carbon dioxide emission factors, is described. The proposed method in a single study provides the proportion of the renewable energy sources for maximum generating capacity or lowest generation cost subject to lowest emission or to lowest capital cost.
{"title":"Monte Carlo Planning Technique for Renewable Energy Sources","authors":"C. Indulkar","doi":"10.1109/ICPST.2008.4745150","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745150","url":null,"abstract":"Distributed power generation provides electric power at a site closer to customers. This paper, formulates the problem of optimal utilization of renewable energy options to meet the peak load demand. A Monte Carlo apportioning technique of solar photovoltaic, co-generation, wind power, and small hydro, which considers specific techno-economic constraints, such as capital cost and generation cost constraints, and carbon dioxide emission factors, is described. The proposed method in a single study provides the proportion of the renewable energy sources for maximum generating capacity or lowest generation cost subject to lowest emission or to lowest capital cost.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129472065","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745364
A. Kumar, K. Padiyar
Chain cell converter as a shunt connected, multilevel voltage source converter has been proposed for static VAR compensation. This converter consists of identical H-bridge building blocks (HBBBs) connected in series in each phase. Chain cell converter synthesizes a desired ac waveform from several levels of DC voltages provided by the DC capacitors with only one switching per cycle. The transient model of the converter is developed considering a three phase three wire system. The analysis and design of converter controls is presented. DC voltage balancing strategy which involves pulse swapping is implemented. Simulations are carried out for the performance evaluation of converter controls. Chain cell converter is also tested, when connected in a distribution system, as a STATCOM to compensate the voltage flicker due to an arc furnace load.
{"title":"Modeling, Analysis and Control of a Chain Cell Converter","authors":"A. Kumar, K. Padiyar","doi":"10.1109/ICPST.2008.4745364","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745364","url":null,"abstract":"Chain cell converter as a shunt connected, multilevel voltage source converter has been proposed for static VAR compensation. This converter consists of identical H-bridge building blocks (HBBBs) connected in series in each phase. Chain cell converter synthesizes a desired ac waveform from several levels of DC voltages provided by the DC capacitors with only one switching per cycle. The transient model of the converter is developed considering a three phase three wire system. The analysis and design of converter controls is presented. DC voltage balancing strategy which involves pulse swapping is implemented. Simulations are carried out for the performance evaluation of converter controls. Chain cell converter is also tested, when connected in a distribution system, as a STATCOM to compensate the voltage flicker due to an arc furnace load.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124806891","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745337
S. Xavier, P. Venkatesh, M. Saravanan
To study and analyze the dynamic performance of the flexible AC transmission system (FACTS) devices, modelling of the FACTS devices is needed. Reactive power compensation is an important issue in the control of electric power systems. Reactive power increases the transmission system losses and reduces the power transmission capability of the transmission lines. Moreover, reactive power transmitted through the transmission lines can cause large amplitude variations in the receiving-end voltage. This paper illustrates the effect of static compensator (STATCOM) in power system on reactive power control by proper modelling of simple power system and voltage source converter based STATCOM (Static compensator) using Simulink and Simpower system toolboxes in MATLAB. The proposed control structure is also verified via state- of- the- art dSPACE software.
{"title":"Development of Intelligent Controllers for STATCOM","authors":"S. Xavier, P. Venkatesh, M. Saravanan","doi":"10.1109/ICPST.2008.4745337","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745337","url":null,"abstract":"To study and analyze the dynamic performance of the flexible AC transmission system (FACTS) devices, modelling of the FACTS devices is needed. Reactive power compensation is an important issue in the control of electric power systems. Reactive power increases the transmission system losses and reduces the power transmission capability of the transmission lines. Moreover, reactive power transmitted through the transmission lines can cause large amplitude variations in the receiving-end voltage. This paper illustrates the effect of static compensator (STATCOM) in power system on reactive power control by proper modelling of simple power system and voltage source converter based STATCOM (Static compensator) using Simulink and Simpower system toolboxes in MATLAB. The proposed control structure is also verified via state- of- the- art dSPACE software.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124884676","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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