Pub Date : 2008-04-06DOI: 10.1109/DRPT.2008.4523712
Yong Li, L. Luo, K. Nakamura, C. Rehtanz, Jie Zhang, Jiazhu Xu, Fusheng Liu
The new HVDC transmission system adopts the new converter transformer and the corresponding inductive filtering method, and its electrical topology structure is completely different from that of the existential HVDC transmission system. For the change of the controlled system, the transient response characteristics of the new HVDC transmission system will be accordingly changed when it adopts the standard control model that the traditional HVDC transmission system adopts. Referring to the parameters of the main circuit of the OGRE HVDC first benchmark model, this paper designs a similar benchmark model of the new HVDC transmission system based on the technical characteristics of the new converter transformer and the corresponding inductive filtering method, which mainly contains the rated parameters of the new converter transformer and the inductive filtering device. Then, the typical transient response characteristics of the new HVDC transmission system have been analyzed and simulated by PSCAD/EMTDC. The results express that the new HVDC transmission system, which adopts the standard control model that the HVDC transmission engineering adopts, has a good transient response characteristic, and can operate stably when subjecting to various typical disturbance.
{"title":"Transient response characteristics of new HVDC transmission system based on new converter transformer","authors":"Yong Li, L. Luo, K. Nakamura, C. Rehtanz, Jie Zhang, Jiazhu Xu, Fusheng Liu","doi":"10.1109/DRPT.2008.4523712","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523712","url":null,"abstract":"The new HVDC transmission system adopts the new converter transformer and the corresponding inductive filtering method, and its electrical topology structure is completely different from that of the existential HVDC transmission system. For the change of the controlled system, the transient response characteristics of the new HVDC transmission system will be accordingly changed when it adopts the standard control model that the traditional HVDC transmission system adopts. Referring to the parameters of the main circuit of the OGRE HVDC first benchmark model, this paper designs a similar benchmark model of the new HVDC transmission system based on the technical characteristics of the new converter transformer and the corresponding inductive filtering method, which mainly contains the rated parameters of the new converter transformer and the inductive filtering device. Then, the typical transient response characteristics of the new HVDC transmission system have been analyzed and simulated by PSCAD/EMTDC. The results express that the new HVDC transmission system, which adopts the standard control model that the HVDC transmission engineering adopts, has a good transient response characteristic, and can operate stably when subjecting to various typical disturbance.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122219748","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523431
Hong-dong Li, Feng Yi, Bao-zhu Li, Zeng Ming
The research on direct trade mode between large consumer and generator has practical significance on the promotion of large consumer's direct trade. Based on the primary analysis of the pilot status of large consumer's direct trade, the text tries to clear the effects and obstacles during the development of large consumer's direct trade in China. The main reform experience of international direct trade of large consumer is also summarized. On the basis of the research on domestic and international trade mode, the text brings forward the basic direct trade mode of large consumer aiming at the domestic status and gives relative constructive suggestions on some issues including transmission and distribution price, market access, trade space electricity, etc.
{"title":"Research on direct trade between large consumer and generator in China","authors":"Hong-dong Li, Feng Yi, Bao-zhu Li, Zeng Ming","doi":"10.1109/DRPT.2008.4523431","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523431","url":null,"abstract":"The research on direct trade mode between large consumer and generator has practical significance on the promotion of large consumer's direct trade. Based on the primary analysis of the pilot status of large consumer's direct trade, the text tries to clear the effects and obstacles during the development of large consumer's direct trade in China. The main reform experience of international direct trade of large consumer is also summarized. On the basis of the research on domestic and international trade mode, the text brings forward the basic direct trade mode of large consumer aiming at the domestic status and gives relative constructive suggestions on some issues including transmission and distribution price, market access, trade space electricity, etc.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"445 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114096849","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523687
Wei Deng, W. Pei, Z. Qi
This paper illuminates some voltage quality problems caused by distributed generation (DG) in microgrid, including voltage fluctuation, voltage sag and voltage swell, voltage uplifted and harmonic resonance due to large capacity capacitor switching and so on. It studies the characteristic of these kinds of voltage quality problem and their impact on microgrid. According to these characteristics, this paper presents a method which depends on the type and structure of DG in microgrid to improve the voltage quality. The studies show that the penetration of DG in microgrid has beneficial improvement of system response to voltage disturbances. Rotating type DG can mitigate voltage fluctuation caused by rapidly changing loads due to its short circuit strength. Inverter type DG also has beneficial impact on voltage fluctuation if it has voltage regulation function. Simulation and analysis on a system model show that the proposed approach is effective and promising.
{"title":"Impact and improvement of Distributed Generation on voltage quality in Micro-grid","authors":"Wei Deng, W. Pei, Z. Qi","doi":"10.1109/DRPT.2008.4523687","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523687","url":null,"abstract":"This paper illuminates some voltage quality problems caused by distributed generation (DG) in microgrid, including voltage fluctuation, voltage sag and voltage swell, voltage uplifted and harmonic resonance due to large capacity capacitor switching and so on. It studies the characteristic of these kinds of voltage quality problem and their impact on microgrid. According to these characteristics, this paper presents a method which depends on the type and structure of DG in microgrid to improve the voltage quality. The studies show that the penetration of DG in microgrid has beneficial improvement of system response to voltage disturbances. Rotating type DG can mitigate voltage fluctuation caused by rapidly changing loads due to its short circuit strength. Inverter type DG also has beneficial impact on voltage fluctuation if it has voltage regulation function. Simulation and analysis on a system model show that the proposed approach is effective and promising.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114103739","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523605
N. Zhou, Tian Ye, Rui Huang, Jingwei Zhang
When single phase earth fault occurs in EHV/UHV (extra high voltage/ ultra high voltage) transmission line, distinguishing the type of fault is the guarantee of application of single phase adaptive reclosure.This paper analyzes the characteristic of the recovery voltage when single phase earth fault occurs in EHV/UHV transmission line with shunt reactor. The results show that recovery voltage of temporary fault contains the components of power frequency and resonant frequency, while the recovery voltage of permanent fault only contains power frequency component. According to the different frequency characteristics of recovery voltage, a new method based on power spectrum to distinguish the temporary faults from permanent faults in EHV/UHV transmission lines is proposed. Using the distribution of spectral line nearby the power frequency in power spectrum, this method can distinguish the types of fault. The criterion which doesn't need high frequency contents is prone to set and realize. Simulations have been carried out by MATLAB/ SIMULINK and the power spectrums have been calculated. The results show that the proposed method is exact and feasible.
{"title":"Power spectrum of fault phase voltage based single-phase adaptive reclosure","authors":"N. Zhou, Tian Ye, Rui Huang, Jingwei Zhang","doi":"10.1109/DRPT.2008.4523605","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523605","url":null,"abstract":"When single phase earth fault occurs in EHV/UHV (extra high voltage/ ultra high voltage) transmission line, distinguishing the type of fault is the guarantee of application of single phase adaptive reclosure.This paper analyzes the characteristic of the recovery voltage when single phase earth fault occurs in EHV/UHV transmission line with shunt reactor. The results show that recovery voltage of temporary fault contains the components of power frequency and resonant frequency, while the recovery voltage of permanent fault only contains power frequency component. According to the different frequency characteristics of recovery voltage, a new method based on power spectrum to distinguish the temporary faults from permanent faults in EHV/UHV transmission lines is proposed. Using the distribution of spectral line nearby the power frequency in power spectrum, this method can distinguish the types of fault. The criterion which doesn't need high frequency contents is prone to set and realize. Simulations have been carried out by MATLAB/ SIMULINK and the power spectrums have been calculated. The results show that the proposed method is exact and feasible.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121102316","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523432
Chen Xiaoliang, T. Kuo, Zeng Ming
It's the must link for power grid companies to investment evaluation. In the traditional evaluation process, the decision-making based on the original score or a similar program is earlier, which exists the problem of simple theoretical support shortfall. This paper fully considers the power grid construction investment in the process of various factors, and makes the actual demand for standards, building a set of hierarchical structure with three indicators of the index system, on this basis, analyzing Hierarchy Process and gray correlation method, designing the evaluation model, and making a example to prove the evaluation model validated.
{"title":"Transmission investment evaluation based on Hierarchy-gray correlation model","authors":"Chen Xiaoliang, T. Kuo, Zeng Ming","doi":"10.1109/DRPT.2008.4523432","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523432","url":null,"abstract":"It's the must link for power grid companies to investment evaluation. In the traditional evaluation process, the decision-making based on the original score or a similar program is earlier, which exists the problem of simple theoretical support shortfall. This paper fully considers the power grid construction investment in the process of various factors, and makes the actual demand for standards, building a set of hierarchical structure with three indicators of the index system, on this basis, analyzing Hierarchy Process and gray correlation method, designing the evaluation model, and making a example to prove the evaluation model validated.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116109622","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523648
M. Tousi, S. Hosseinian
This paper presents the design of a neurocontroller for a STATCOM that augments the conventional PI controller. The neurocontroller uses adaptive critic designs (ACDs) with emphasis on dual heuristic programming (DHP). Results are presented to show that the DHP based neurocontroller performs better than the conventional PI controller, especially when the system conditions and configuration changes. The numerical simulation results of using this method in one STATCOM connected to power system show that the control scheme can maintain voltage at load bus and prevent the occurrence of voltage collapse when the large disturbances occur.
{"title":"DHP Adaptive Critic based control of STATCOM in power system","authors":"M. Tousi, S. Hosseinian","doi":"10.1109/DRPT.2008.4523648","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523648","url":null,"abstract":"This paper presents the design of a neurocontroller for a STATCOM that augments the conventional PI controller. The neurocontroller uses adaptive critic designs (ACDs) with emphasis on dual heuristic programming (DHP). Results are presented to show that the DHP based neurocontroller performs better than the conventional PI controller, especially when the system conditions and configuration changes. The numerical simulation results of using this method in one STATCOM connected to power system show that the control scheme can maintain voltage at load bus and prevent the occurrence of voltage collapse when the large disturbances occur.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115866192","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523860
I. Erlich, C. Feltes, F. Shewarega, M. Wilch
This paper deals with the impact of increased wind power generation on the behavior of the interconnected system in steady state as well as during and after a contingency situation. The issues specifically considered are performance during a severe short-circuit and frequency stability after a sudden loss of generation. The results of the short-circuit simulation are then evaluated vis-a-vis the grid code requirements placed on wind generating plants. Using a large interconnected system encompassing several conventional synchronous generators, the effect of increased wind power generation on the frequency stability of the system after a loss of generation has been discussed. It was found out that at the conceptual level there are a range of options which would place wind generating plants in a position to support system frequency in an emergency situation.
{"title":"Interaction of large offshore wind parks with the electrical grid","authors":"I. Erlich, C. Feltes, F. Shewarega, M. Wilch","doi":"10.1109/DRPT.2008.4523860","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523860","url":null,"abstract":"This paper deals with the impact of increased wind power generation on the behavior of the interconnected system in steady state as well as during and after a contingency situation. The issues specifically considered are performance during a severe short-circuit and frequency stability after a sudden loss of generation. The results of the short-circuit simulation are then evaluated vis-a-vis the grid code requirements placed on wind generating plants. Using a large interconnected system encompassing several conventional synchronous generators, the effect of increased wind power generation on the frequency stability of the system after a loss of generation has been discussed. It was found out that at the conceptual level there are a range of options which would place wind generating plants in a position to support system frequency in an emergency situation.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121669433","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523408
Hua Zheng, Li Xie, Lizi Zhang
In the electricity market, various market risks have been the main problems that the market participants have to face with and handle, including operational risk, credit analysis, price risk and so on. Among these risks, price risk is one of the basic problems according to the centralization location of electricity prices and their great influence on the benefits of the market participants. To solve this problem, our discussion and analysis of electricity price will almost focus on the volatility analysis, which is proposed by wavelet transformation in this paper. According to wavelet analysis, electricity price series is expanded to its wavelet series, which in different scales are orthogonal. And reconstruct price component series give a proper interpretation of the original price, by using which we identify price volatility and analyze on its mechanism. Finally the real data in New South Wales electricity market are applied to test the proposed model.
{"title":"Volatility analysis on electricity price by Wavelet Analysis","authors":"Hua Zheng, Li Xie, Lizi Zhang","doi":"10.1109/DRPT.2008.4523408","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523408","url":null,"abstract":"In the electricity market, various market risks have been the main problems that the market participants have to face with and handle, including operational risk, credit analysis, price risk and so on. Among these risks, price risk is one of the basic problems according to the centralization location of electricity prices and their great influence on the benefits of the market participants. To solve this problem, our discussion and analysis of electricity price will almost focus on the volatility analysis, which is proposed by wavelet transformation in this paper. According to wavelet analysis, electricity price series is expanded to its wavelet series, which in different scales are orthogonal. And reconstruct price component series give a proper interpretation of the original price, by using which we identify price volatility and analyze on its mechanism. Finally the real data in New South Wales electricity market are applied to test the proposed model.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"2009 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123811766","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523572
Y.Z. Lin, Z. Cai, Q. Mo
In this paper, a transient energy function for AC/DC power systems is used to evaluate critical clearing times with consideration of the DC dynamics. The generator angular speeds, rotor angles and voltages at the HVDC link's AC buses are explicit variables in the transient energy function. A method for computing the transient energy function numerically is proposed. In the method, the angular speeds and rotor angles deemed as slow dynamics are integrated along sustained fault trajectories, and the integral path of the DC dynamics treated as fast dynamics are acquired by some modifications. The problems in applying potential energy boundary surface (PEBS) method to the computation of critical clearing time are also discussed. The critical clearing times for 4-generator and 10-generator AC/DC systems obtained using the transient energy function approximate well to those with the step-by-step time simulation.
{"title":"Transient stability analysis of AC/DC power system based on transient energy function","authors":"Y.Z. Lin, Z. Cai, Q. Mo","doi":"10.1109/DRPT.2008.4523572","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523572","url":null,"abstract":"In this paper, a transient energy function for AC/DC power systems is used to evaluate critical clearing times with consideration of the DC dynamics. The generator angular speeds, rotor angles and voltages at the HVDC link's AC buses are explicit variables in the transient energy function. A method for computing the transient energy function numerically is proposed. In the method, the angular speeds and rotor angles deemed as slow dynamics are integrated along sustained fault trajectories, and the integral path of the DC dynamics treated as fast dynamics are acquired by some modifications. The problems in applying potential energy boundary surface (PEBS) method to the computation of critical clearing time are also discussed. The critical clearing times for 4-generator and 10-generator AC/DC systems obtained using the transient energy function approximate well to those with the step-by-step time simulation.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116572479","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 : 2008-04-06DOI: 10.1109/DRPT.2008.4523480
Gonggui Chen
In this paper, the problem of optimal switch device placement in distribution network is analyzed. A model with economic and reliable constraints is presented. The objective is to minimize the sum of investment and maintenance of switch devices. Average service availability index (ASAI) is adopted as one of the constraints. In order to improve the calculation speed of planning,a partition method based on automatic switch is presented to calculate the reliability index. Quantum evolution algorithm (QEA) is introduced and applied to solve the presented problem. An example gives an illustration of the feasibility of the presented method.
{"title":"A novel QEA-based optimum switch placement method for improving customer service reliability","authors":"Gonggui Chen","doi":"10.1109/DRPT.2008.4523480","DOIUrl":"https://doi.org/10.1109/DRPT.2008.4523480","url":null,"abstract":"In this paper, the problem of optimal switch device placement in distribution network is analyzed. A model with economic and reliable constraints is presented. The objective is to minimize the sum of investment and maintenance of switch devices. Average service availability index (ASAI) is adopted as one of the constraints. In order to improve the calculation speed of planning,a partition method based on automatic switch is presented to calculate the reliability index. Quantum evolution algorithm (QEA) is introduced and applied to solve the presented problem. An example gives an illustration of the feasibility of the presented method.","PeriodicalId":240420,"journal":{"name":"2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114299065","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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