Pub Date : 2006-09-01DOI: 10.1109/UPEC.2006.367778
Guodong Li, C. Mao, Jiming Lu, Dan Wang
Compared with the traditional MVDs, including two-level, three-level, hybrid and cascaded multi-level (CML) with poly-phase multi-winding transformer structure, new cascaded multi-level based 6 kV MVDs without input and output transformers is developed. Then, its corresponding multi-input and multi-output nonlinear mathematic model is built in this paper with the phase-shifted carrier pulse modulation (PSCPWM) applied. For the MVDs wider working range, input-state linearization is used to transform the proposed nonlinear model to be linear one. Consequently, the DC capacitor voltage is selected to be the feedback to achieve well voltage sharing among the series connected power units. For the purpose of modular and redundant design, decentralized coordinated control strategy is studied, which lead no message exchange among series connected power units. Furthermore, the active and inactive decouple control is realized in the rectifier of the MVDs. Mathematic simulations show the efficiency of the proposed control scheme
{"title":"Cascaded Multi-Level Based 6kV MVDS without Input and Output Transformers and its Control","authors":"Guodong Li, C. Mao, Jiming Lu, Dan Wang","doi":"10.1109/UPEC.2006.367778","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367778","url":null,"abstract":"Compared with the traditional MVDs, including two-level, three-level, hybrid and cascaded multi-level (CML) with poly-phase multi-winding transformer structure, new cascaded multi-level based 6 kV MVDs without input and output transformers is developed. Then, its corresponding multi-input and multi-output nonlinear mathematic model is built in this paper with the phase-shifted carrier pulse modulation (PSCPWM) applied. For the MVDs wider working range, input-state linearization is used to transform the proposed nonlinear model to be linear one. Consequently, the DC capacitor voltage is selected to be the feedback to achieve well voltage sharing among the series connected power units. For the purpose of modular and redundant design, decentralized coordinated control strategy is studied, which lead no message exchange among series connected power units. Furthermore, the active and inactive decouple control is realized in the rectifier of the MVDs. Mathematic simulations show the efficiency of the proposed control scheme","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126976236","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367609
A. R. Al-Zyoud, A. Khraiwish, M. Shakarchi
Power system harmonics affect relay operation in many ways, they can reduce operating currents, increase or decrease operating time. Distance relays reach can be affected. This paper reviews relay performance in the presence of harmonics current the results are recorded
{"title":"Protective Relays Performance in a Harmonic Environment","authors":"A. R. Al-Zyoud, A. Khraiwish, M. Shakarchi","doi":"10.1109/UPEC.2006.367609","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367609","url":null,"abstract":"Power system harmonics affect relay operation in many ways, they can reduce operating currents, increase or decrease operating time. Distance relays reach can be affected. This paper reviews relay performance in the presence of harmonics current the results are recorded","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121829017","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367729
P. Lyons, P. Taylor, L. Cipcigan, P. Trichakis, A. Wilson
A recent study has indicated that installed micro-generation capacity in the UK could grow to as much as 8 GW by 2015. Clearly, this significant growth will present a number of challenges and opportunities for the electricity industry. Current research in the New and Renewable Energy Group at Durham University seeks to address these issues. This paper describes this research and introduces the concept of an SSEZ (small scale energy zone) and presents a series of IPSA+ models to support this concept. An SSEZ is defined as a distribution network zone containing a significant number of controllable small scale generators, distributed energy storage units and loads. Algorithms will be developed to take an integrated approach to the control of each of these three elements in order to increase the value of SSEG's in terms of economic return, environmental benefit and contribution to network operation. The IPSA+ distribution network models feature high concentrations of SSEG's but are conventional type distribution networks, as opposed to the envisaged active distribution network of an SSEZ. These models are used to evaluate the impact on steady-state voltage rise of a range of SSEG penetrations. This paper describes the SSEZ concept, the IPSA+ models and the laboratory based SSEZ under development at Durham University
{"title":"Small Scale Energy Zones and the Impacts of High Concentrations of Small Scale Embedded Generators","authors":"P. Lyons, P. Taylor, L. Cipcigan, P. Trichakis, A. Wilson","doi":"10.1109/UPEC.2006.367729","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367729","url":null,"abstract":"A recent study has indicated that installed micro-generation capacity in the UK could grow to as much as 8 GW by 2015. Clearly, this significant growth will present a number of challenges and opportunities for the electricity industry. Current research in the New and Renewable Energy Group at Durham University seeks to address these issues. This paper describes this research and introduces the concept of an SSEZ (small scale energy zone) and presents a series of IPSA+ models to support this concept. An SSEZ is defined as a distribution network zone containing a significant number of controllable small scale generators, distributed energy storage units and loads. Algorithms will be developed to take an integrated approach to the control of each of these three elements in order to increase the value of SSEG's in terms of economic return, environmental benefit and contribution to network operation. The IPSA+ distribution network models feature high concentrations of SSEG's but are conventional type distribution networks, as opposed to the envisaged active distribution network of an SSEZ. These models are used to evaluate the impact on steady-state voltage rise of a range of SSEG penetrations. This paper describes the SSEZ concept, the IPSA+ models and the laboratory based SSEZ under development at Durham University","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121034372","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367611
F. Alrumayan, I. Cotton
This paper details a partial discharge measurement detection model that has been used to produce a test circuit suitable for detection of partial discharge at high frequencies. The circuit is designed to identify partial discharges in different insulating samples stressed by non-standard (including high frequency sine-waves and square waves). This is particularly important for the testing of equipment used in modern high voltage power electronic environments. The circuit was built and tested after carrying out simulations using the PSPICE software. The details of these simulations and the results collected are presented in this paper. The advantage of a balanced circuit measurement system is highlighted as well as the variance in predicted noise levels when different frequencies are used to energize the object under test. A comparison between the simulated circuit response and the experimental results is included
{"title":"Detection of Partial Discharges at High Frequencies","authors":"F. Alrumayan, I. Cotton","doi":"10.1109/UPEC.2006.367611","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367611","url":null,"abstract":"This paper details a partial discharge measurement detection model that has been used to produce a test circuit suitable for detection of partial discharge at high frequencies. The circuit is designed to identify partial discharges in different insulating samples stressed by non-standard (including high frequency sine-waves and square waves). This is particularly important for the testing of equipment used in modern high voltage power electronic environments. The circuit was built and tested after carrying out simulations using the PSPICE software. The details of these simulations and the results collected are presented in this paper. The advantage of a balanced circuit measurement system is highlighted as well as the variance in predicted noise levels when different frequencies are used to energize the object under test. A comparison between the simulated circuit response and the experimental results is included","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"211 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116398289","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367556
Wu Maolin, Huang Shenghua
This paper describes a method of determination of permanent magnet synchronous machines (PMSM) parameters using simple load test combination with a linear regression model, which can avoid the disadvantages of the traditional load test. In the test, only supply phase voltage, phase current and the rotor position would be required, then the linear regression model was improved to simplify algorithm using QR decompose of matrix. The parameters including e0, R, Ld and Lq obtained by using this technique vary more smoothly, while results obtained by no load test are fluctuating. This method can be used to derive the nonlinear parameter identified model of PMSM in order to apply in an on-line computer controlled environment at the different operating conditions
{"title":"Determination of PMSM Parameters from Simple Load Test","authors":"Wu Maolin, Huang Shenghua","doi":"10.1109/UPEC.2006.367556","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367556","url":null,"abstract":"This paper describes a method of determination of permanent magnet synchronous machines (PMSM) parameters using simple load test combination with a linear regression model, which can avoid the disadvantages of the traditional load test. In the test, only supply phase voltage, phase current and the rotor position would be required, then the linear regression model was improved to simplify algorithm using QR decompose of matrix. The parameters including e0, R, Ld and Lq obtained by using this technique vary more smoothly, while results obtained by no load test are fluctuating. This method can be used to derive the nonlinear parameter identified model of PMSM in order to apply in an on-line computer controlled environment at the different operating conditions","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126922781","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367742
T. Toyoshima, G. Shirai, T. Tsukui, M. Matsubara, G. Fujita, W. Chen, R. Yokoyama, K. Koyanagi, T. Funabashi
Recently, solar energy generation and wind power generation have been introduced to electric power system. But, as for this natural energy, influence such as frequency fluctuation is exerted on electric power system, which is a fundamental problem in operation of a small grid system such as micro-grid. These systems should provide appropriate power quality compared to a large grid. However, using the telecommunication line for monitoring and controlling the system devices is costly, as an alternative method, autonomous distribution control that enables local power supply and demand control is also required in design and operational stage. This paper discusses benefits of these methods conducting cost evaluation
{"title":"Autonomous Distributed Control of Micro Grid with Diesel Generator","authors":"T. Toyoshima, G. Shirai, T. Tsukui, M. Matsubara, G. Fujita, W. Chen, R. Yokoyama, K. Koyanagi, T. Funabashi","doi":"10.1109/UPEC.2006.367742","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367742","url":null,"abstract":"Recently, solar energy generation and wind power generation have been introduced to electric power system. But, as for this natural energy, influence such as frequency fluctuation is exerted on electric power system, which is a fundamental problem in operation of a small grid system such as micro-grid. These systems should provide appropriate power quality compared to a large grid. However, using the telecommunication line for monitoring and controlling the system devices is costly, as an alternative method, autonomous distribution control that enables local power supply and demand control is also required in design and operational stage. This paper discusses benefits of these methods conducting cost evaluation","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123794604","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367712
H. El-Helw, S. Tennakon, N. Shammas
Recently, generation of electricity using wind power has received considerable attention worldwide. During the last two decades, the production of wind turbines has grown in size from 20 KW to 3.6 MW. There currently exist various competing technologies for wind generator systems, whose differences lie in the complexity, cost, and degree of control over the system characteristics. Induction generators are more attractive than synchronous generators as wind turbine generators, due to their low cost, ruggedness, and the need for little or no maintenance. Unfortunately, induction generators require reactive power from the grid to operate and therefore some means of compensation is required, specially, in the case of large wind farm connected to a weak power system.
{"title":"Compensation Methods in Wind Energy Systems","authors":"H. El-Helw, S. Tennakon, N. Shammas","doi":"10.1109/UPEC.2006.367712","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367712","url":null,"abstract":"Recently, generation of electricity using wind power has received considerable attention worldwide. During the last two decades, the production of wind turbines has grown in size from 20 KW to 3.6 MW. There currently exist various competing technologies for wind generator systems, whose differences lie in the complexity, cost, and degree of control over the system characteristics. Induction generators are more attractive than synchronous generators as wind turbine generators, due to their low cost, ruggedness, and the need for little or no maintenance. Unfortunately, induction generators require reactive power from the grid to operate and therefore some means of compensation is required, specially, in the case of large wind farm connected to a weak power system.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124076411","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367773
R. Al-Khannak, B. Bitzer
Power load forecasting is the problem which is solved in this paper under MATLAB environment by constructing a neural network for the power load to find simulated solution with the minimum error square. MATLAB code has been programmed for approximating power load data by using the radial based function (RBF) neural network with Gaussian basis function (GBF's). A developed algorithm to achieve load forecasting application with faster techniques is the aim for this paper. The algorithm is used to enable MATLAB power application to be implemented by multi machines in the grid system. Dividing power job into multi tasks job and then to distribute these tasks to the available idle grid contributor(s) to achieve that application within much less time, cheaper cost and with high accuracy and quality. Grid computing, the new computational distributing technology has been used to enhance the performance of power applications to get benefits of idle grid contributor(s) by sharing computational power resources.
{"title":"Grid Computing for Power and Automation Systems Implementations","authors":"R. Al-Khannak, B. Bitzer","doi":"10.1109/UPEC.2006.367773","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367773","url":null,"abstract":"Power load forecasting is the problem which is solved in this paper under MATLAB environment by constructing a neural network for the power load to find simulated solution with the minimum error square. MATLAB code has been programmed for approximating power load data by using the radial based function (RBF) neural network with Gaussian basis function (GBF's). A developed algorithm to achieve load forecasting application with faster techniques is the aim for this paper. The algorithm is used to enable MATLAB power application to be implemented by multi machines in the grid system. Dividing power job into multi tasks job and then to distribute these tasks to the available idle grid contributor(s) to achieve that application within much less time, cheaper cost and with high accuracy and quality. Grid computing, the new computational distributing technology has been used to enhance the performance of power applications to get benefits of idle grid contributor(s) by sharing computational power resources.","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126418731","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367565
A. H. Ahmad, D. A. Smait
This work is focusing on the following main sights: modeling, design, and implementation of a prototype radial magnetic bearing system. Analysis of the magnetic field parameters in particular the magnetic flux density and the associated magnetic forces by constructing and using finite element method are well considered. A field mapping technique is presented for modeling any other type. In order to designate an active radial magnetic bearings, the designed force and the saturated magnetic flux density are considered as the important parameters to be used. Finite element method is used to evaluate and mapping the field through the model for different cases which in turns show the effective magnetic forces at the desired region
{"title":"Modeling and Design of a Prototype Radial Magnetic Bearing System","authors":"A. H. Ahmad, D. A. Smait","doi":"10.1109/UPEC.2006.367565","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367565","url":null,"abstract":"This work is focusing on the following main sights: modeling, design, and implementation of a prototype radial magnetic bearing system. Analysis of the magnetic field parameters in particular the magnetic flux density and the associated magnetic forces by constructing and using finite element method are well considered. A field mapping technique is presented for modeling any other type. In order to designate an active radial magnetic bearings, the designed force and the saturated magnetic flux density are considered as the important parameters to be used. Finite element method is used to evaluate and mapping the field through the model for different cases which in turns show the effective magnetic forces at the desired region","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126490351","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 : 2006-09-01DOI: 10.1109/UPEC.2006.367539
Yang Qiu-rong, Duan Xian-zhong, Liu Xin, Wang Xue-feng
There is not a sound method which can solve the compensation problem of the distributed capacitance current in 10 kV railway cable-only continuous power transmission line. The feasibilities and disadvantages of the two present technologies are analyzed and discussed, the one of which is the grounded wye-reactor, and the other is using the neutral resonance grounding system. A novel optimum compensation scheme that combines the two technologies to solve this problem is proposed. The power factor at the head and the voltage at the end of the line and the single-phase grounding current are modeled and analyzed in this paper. It is proved that the compensation to the inductive reactive power is necessary to the correction of the power factor
{"title":"Influence of Distributed Capacitance in Railway Cable-Only Continuous Power Transmission Line and Its Compensation","authors":"Yang Qiu-rong, Duan Xian-zhong, Liu Xin, Wang Xue-feng","doi":"10.1109/UPEC.2006.367539","DOIUrl":"https://doi.org/10.1109/UPEC.2006.367539","url":null,"abstract":"There is not a sound method which can solve the compensation problem of the distributed capacitance current in 10 kV railway cable-only continuous power transmission line. The feasibilities and disadvantages of the two present technologies are analyzed and discussed, the one of which is the grounded wye-reactor, and the other is using the neutral resonance grounding system. A novel optimum compensation scheme that combines the two technologies to solve this problem is proposed. The power factor at the head and the voltage at the end of the line and the single-phase grounding current are modeled and analyzed in this paper. It is proved that the compensation to the inductive reactive power is necessary to the correction of the power factor","PeriodicalId":184186,"journal":{"name":"Proceedings of the 41st International Universities Power Engineering Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127925118","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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