Pub Date : 2010-12-03DOI: 10.1504/IJASM.2011.040517
T. Hammons
This paper reviews generation, transmission and interconnection projects together with impact of the global financial crisis on the Southern Africa Power Pool (SAPP), with possible recommendations.
{"title":"Status of implementation of generation, transmission and interconnection projects in the Southern Africa Power Pool","authors":"T. Hammons","doi":"10.1504/IJASM.2011.040517","DOIUrl":"https://doi.org/10.1504/IJASM.2011.040517","url":null,"abstract":"This paper reviews generation, transmission and interconnection projects together with impact of the global financial crisis on the Southern Africa Power Pool (SAPP), with possible recommendations.","PeriodicalId":375574,"journal":{"name":"45th International Universities Power Engineering Conference UPEC2010","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131481994","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}
The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance.
{"title":"The application of multi frequency resonant controllers in in a dfig to improve performance by reducing unwanted power and torque pulsations and reducing current harmonics","authors":"Joseph Kearney, M. Conlon, E. Coyle","doi":"10.21427/84DE-M177","DOIUrl":"https://doi.org/10.21427/84DE-M177","url":null,"abstract":"The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance.","PeriodicalId":375574,"journal":{"name":"45th International Universities Power Engineering Conference UPEC2010","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129703255","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 : 2010-12-03DOI: 10.3923/JAS.2010.471.478
Mohammad-Reza Askari, M. Kazemi
Induction motors, especially squirrel cage motors, have an important role in industry. Their rotor or stator may be failed under stresses depending on their application, and sometimes an unexpected motor failure in a manufacture production process may result in unexpected and unforeseen tripping. So, if the failure can be detected during its operation, there are some methods to prevent failure spread and also manufacture trip. This study aims to model and simulate the squirrel cage induction motor at any operation condition such as healthy condition and broken bars failures in side of rotor, in order to achieve an algorithm for failure detection. So, in this paper a new method base on Wavelet theory is used for failure detection. Simulation results show that using wavelet transform can effectively be used to diagnose the broken bars in the motor.
{"title":"Using Wavelet theory for detection of broken bars in squirrel cage induction motors","authors":"Mohammad-Reza Askari, M. Kazemi","doi":"10.3923/JAS.2010.471.478","DOIUrl":"https://doi.org/10.3923/JAS.2010.471.478","url":null,"abstract":"Induction motors, especially squirrel cage motors, have an important role in industry. Their rotor or stator may be failed under stresses depending on their application, and sometimes an unexpected motor failure in a manufacture production process may result in unexpected and unforeseen tripping. So, if the failure can be detected during its operation, there are some methods to prevent failure spread and also manufacture trip. This study aims to model and simulate the squirrel cage induction motor at any operation condition such as healthy condition and broken bars failures in side of rotor, in order to achieve an algorithm for failure detection. So, in this paper a new method base on Wavelet theory is used for failure detection. Simulation results show that using wavelet transform can effectively be used to diagnose the broken bars in the motor.","PeriodicalId":375574,"journal":{"name":"45th International Universities Power Engineering Conference UPEC2010","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134089653","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 investigates the stability improvement of a grid connected fixed speed wind farms following disturbances such as faults, using braking resistors along with reactive power compensation devices. As wind fluctuations and grid disturbances can cause significant shaft oscillations, their interaction effects have been taken into account by employing a two-mass shaft model. The stability performance of the system is examined by simulation studies in the DIgSILENT environment under different levels of compensation, delay time of circuit breakers following the gird fault conditions. Computer simulation results show the combination of braking resistors and reactive compensation can significantly improve the stability of grid connected wind turbines.
{"title":"Stability improvement of wind farms with fixed-speed turbine generators using braking resistors","authors":"R. Ghazi, H. Aliabadi","doi":"10.1049/CP.2009.0586","DOIUrl":"https://doi.org/10.1049/CP.2009.0586","url":null,"abstract":"This paper investigates the stability improvement of a grid connected fixed speed wind farms following disturbances such as faults, using braking resistors along with reactive power compensation devices. As wind fluctuations and grid disturbances can cause significant shaft oscillations, their interaction effects have been taken into account by employing a two-mass shaft model. The stability performance of the system is examined by simulation studies in the DIgSILENT environment under different levels of compensation, delay time of circuit breakers following the gird fault conditions. Computer simulation results show the combination of braking resistors and reactive compensation can significantly improve the stability of grid connected wind turbines.","PeriodicalId":375574,"journal":{"name":"45th International Universities Power Engineering Conference UPEC2010","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115503807","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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