Pub Date : 2008-12-16DOI: 10.1109/UPEC.2008.4651434
Ali Arzani, Mostafa Jazaeri, Y. Alinejad‐Beromi
Series FACTS devices have been successfully used for many years in order to enhance the stability and loadability of high voltage transmission networks. The principle is to compensate the inductive voltage drop in the line by an inserted capacitive voltage or in other words to reduce the effective reactance of the transmission line to enhance available transfer capability (ATC) in the network. ATC accurately reflects the physical realities of the transmission network, all system conditions, uses, and limits in a consistent manner. It depends on other parameters namely total transfer capability (TTC), capacity benefit margin (CBM), transmission reliability margin (TRM), and existing transmission commitments (ETC) that are described in this study thoroughly. This paper investigates the optimized use of FACTS devices and mainly thyristor controlled series capacitor (TCSC) to improve ATC and maximize total transfer capability generally defined as the maximum power transfer transaction between a specific power-seller and a power-buyer in a two area designed power system. The case study has been implemented on a 13-bus multi-machine test system using PowerWorld Simulator version 12.0. Furthermore, static linear analysis methods have been taken into account in calculating ATC and the impact on various factors has been defined clearly.
为了提高高压输电网络的稳定性和负载性，FACTS系列设备已成功使用多年。其原理是通过插入电容电压来补偿线路中的感应电压降，即减小传输线的有效电抗，以提高网络中的可用传输能力(ATC)。ATC以一致的方式准确地反映了传输网络的物理现实、所有系统条件、使用和限制。它取决于其他参数，即总传输能力(TTC)、容量效益边际(CBM)、传输可靠性边际(TRM)和现有传输承诺(ETC)，这些在本研究中得到了充分的描述。本文研究了优化使用FACTS器件和主要是晶闸管控制串联电容器(TCSC)来提高ATC和最大化总传输能力(通常定义为在两个区域设计的电力系统中特定电力卖方和电力买方之间的最大功率传输交易)。本案例研究已在一个13总线的多机测试系统上使用PowerWorld Simulator version 12.0实现。此外，在计算ATC时考虑了静态线性分析方法，明确了各因素对ATC的影响。
{"title":"Available transfer capability enhancement using series FACTS devices in a designed multi-machine power system","authors":"Ali Arzani, Mostafa Jazaeri, Y. Alinejad‐Beromi","doi":"10.1109/UPEC.2008.4651434","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651434","url":null,"abstract":"Series FACTS devices have been successfully used for many years in order to enhance the stability and loadability of high voltage transmission networks. The principle is to compensate the inductive voltage drop in the line by an inserted capacitive voltage or in other words to reduce the effective reactance of the transmission line to enhance available transfer capability (ATC) in the network. ATC accurately reflects the physical realities of the transmission network, all system conditions, uses, and limits in a consistent manner. It depends on other parameters namely total transfer capability (TTC), capacity benefit margin (CBM), transmission reliability margin (TRM), and existing transmission commitments (ETC) that are described in this study thoroughly. This paper investigates the optimized use of FACTS devices and mainly thyristor controlled series capacitor (TCSC) to improve ATC and maximize total transfer capability generally defined as the maximum power transfer transaction between a specific power-seller and a power-buyer in a two area designed power system. The case study has been implemented on a 13-bus multi-machine test system using PowerWorld Simulator version 12.0. Furthermore, static linear analysis methods have been taken into account in calculating ATC and the impact on various factors has been defined clearly.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121532478","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651585
V. Petrović, M. Jelavic, N. Peric
The use of wind power has been increasing rapidly over last few decades and according to all predictions this trend is likely to continue. At the same time need for better cost effectiveness of wind power plants has stimulated growth in wind turbinespsila size and rated power. As wind turbines grow in size they are subject to extreme structural loads and fatigue. In order to reduce such loads advanced control methods are explored among which individual pitch control has demonstrated very promising results. To design an individual pitch controller suitable wind turbine model is required. Derivation of wind turbine model for individual pitch controller design is addressed in this paper.
{"title":"Identification of wind turbine model for individual pitch controller design","authors":"V. Petrović, M. Jelavic, N. Peric","doi":"10.1109/UPEC.2008.4651585","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651585","url":null,"abstract":"The use of wind power has been increasing rapidly over last few decades and according to all predictions this trend is likely to continue. At the same time need for better cost effectiveness of wind power plants has stimulated growth in wind turbinespsila size and rated power. As wind turbines grow in size they are subject to extreme structural loads and fatigue. In order to reduce such loads advanced control methods are explored among which individual pitch control has demonstrated very promising results. To design an individual pitch controller suitable wind turbine model is required. Derivation of wind turbine model for individual pitch controller design is addressed in this paper.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127808871","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651567
I. Makhkamova, P. Taylor, J. Bumby, K. Mahkamov
At present commercial CFD packages such as Fluent, ANSYS CFX, and Star-CD are widely used for investigation of heat and mass transfer processes in various fields of engineering. These codes can also be successfully applied to estimate the thermal state of major components of electrical distribution networks, such as overhead lines, underground cables and transformers. This paper presents some results obtained from numerical modelling of the temperature field in the Lynx overhead conductor in both cross and parallel wind conditions using 2-D and 3-D CFD models. The CFD results obtained demonstrate that for an applied load of 433 A and considering the summer rating (Lynx conductors ER P27 [1]) the maximum temperature in the conductor is considerably lower (16 degrees) than the prescribed design conductor temperature. This indicates that there is headroom for increasing the ampacity of the conductor.
{"title":"CFD analysis of the thermal state of an overhead line conductor","authors":"I. Makhkamova, P. Taylor, J. Bumby, K. Mahkamov","doi":"10.1109/UPEC.2008.4651567","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651567","url":null,"abstract":"At present commercial CFD packages such as Fluent, ANSYS CFX, and Star-CD are widely used for investigation of heat and mass transfer processes in various fields of engineering. These codes can also be successfully applied to estimate the thermal state of major components of electrical distribution networks, such as overhead lines, underground cables and transformers. This paper presents some results obtained from numerical modelling of the temperature field in the Lynx overhead conductor in both cross and parallel wind conditions using 2-D and 3-D CFD models. The CFD results obtained demonstrate that for an applied load of 433 A and considering the summer rating (Lynx conductors ER P27 [1]) the maximum temperature in the conductor is considerably lower (16 degrees) than the prescribed design conductor temperature. This indicates that there is headroom for increasing the ampacity of the conductor.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130347131","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651529
F. Ansyari, C. S. Ozveren, D. King
Recently, allocations of transmission losses have become a major issue in both regulated and deregulated systems. Two main reasons for this are performance and cost issues. Consequently, there have been a large number of investigations undertaken in the area of transmission loss allocation. The aims of this paper are to investigate several loss allocation methods and then choose the best method, or at least the most appropriate and reasonable method. These investigated methods encompass a wide variety of techniques ranging from the classical (Pro-rata and incremental methods) to the newest methods, proportional sharing and Z-bus. The crucial issues of loss allocation are how to measure it precisely and then decide which method is most transparent and perceived to be fair for all parties. In this paper we will firstly developed criteria to categorize loss allocation methods into several groups and then a method will be chosen as a representative of each group. Then, a real network, namely Java-Bali 500 KV grid system, the largest interconnection system in Indonesia, will be used as a case study and each method will be tested under the same loading conditions tested, hi the case studies the losses will be allocated to each load and generator. Based on these simulation results, the results of each method will be compared and the best method will be chosen according to the criteria derived.
{"title":"Comparison of loss allocation methods in a regulated system (A case study at Java-Bali 500KV Grid System in Indonesia)","authors":"F. Ansyari, C. S. Ozveren, D. King","doi":"10.1109/UPEC.2008.4651529","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651529","url":null,"abstract":"Recently, allocations of transmission losses have become a major issue in both regulated and deregulated systems. Two main reasons for this are performance and cost issues. Consequently, there have been a large number of investigations undertaken in the area of transmission loss allocation. The aims of this paper are to investigate several loss allocation methods and then choose the best method, or at least the most appropriate and reasonable method. These investigated methods encompass a wide variety of techniques ranging from the classical (Pro-rata and incremental methods) to the newest methods, proportional sharing and Z-bus. The crucial issues of loss allocation are how to measure it precisely and then decide which method is most transparent and perceived to be fair for all parties. In this paper we will firstly developed criteria to categorize loss allocation methods into several groups and then a method will be chosen as a representative of each group. Then, a real network, namely Java-Bali 500 KV grid system, the largest interconnection system in Indonesia, will be used as a case study and each method will be tested under the same loading conditions tested, hi the case studies the losses will be allocated to each load and generator. Based on these simulation results, the results of each method will be compared and the best method will be chosen according to the criteria derived.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"65 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131220360","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651470
M. El-werfelli, J. Brooks, R. Dunn
This paper presents a novel optimization technique for determining the setting of various emergency power system controls. This will allow for the production of a comprehensive defence plan, against events such as cascading blackouts. The goal of this technique is to retrieve a new equilibrium operation point following a severe contingency. In the proposed optimization technique described in this paper the generator tripping, load shedding and islanding are considered as the main emergency control actions. Genetic Algorithm approaches are very successful at solving nonlinear combinatorial optimization problems; these have been applied in this work to produce an optimized defence plan. A Genetic Algorithm approach is used to find the optimal combination of generators and loads to be tripped as the best solution for the network to regain a new state of equilibrium that is operationally stable, whilst maintaining supply to as many consumers as possible. System islanding may also be applied if a satisfactory state of equilibrium can not otherwise be obtained. The optimization technique uses transient stability evaluation algorithms, based on time-domain simulation, to assess the fitness of the potential solutions. The test case, presented in this paper, for the optimization technique was the Libyan power system network. In order to show the validity of the optimized defence plan, a comparison between the existing Libyan power system defence plan and the optimized defence plan is presented for the case of a major blackout in the western part of the Libyan power system that took place on 8th November 2003. The results presented in this paper show that a robust defence plan with a satisfactory amount of load shedding and system islands can be obtained by the new technique. The paper also demonstrates that the new defence plan outperforms the existing Libyan power system defence plan.
{"title":"An optimized de ence plan or a power system","authors":"M. El-werfelli, J. Brooks, R. Dunn","doi":"10.1109/UPEC.2008.4651470","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651470","url":null,"abstract":"This paper presents a novel optimization technique for determining the setting of various emergency power system controls. This will allow for the production of a comprehensive defence plan, against events such as cascading blackouts. The goal of this technique is to retrieve a new equilibrium operation point following a severe contingency. In the proposed optimization technique described in this paper the generator tripping, load shedding and islanding are considered as the main emergency control actions. Genetic Algorithm approaches are very successful at solving nonlinear combinatorial optimization problems; these have been applied in this work to produce an optimized defence plan. A Genetic Algorithm approach is used to find the optimal combination of generators and loads to be tripped as the best solution for the network to regain a new state of equilibrium that is operationally stable, whilst maintaining supply to as many consumers as possible. System islanding may also be applied if a satisfactory state of equilibrium can not otherwise be obtained. The optimization technique uses transient stability evaluation algorithms, based on time-domain simulation, to assess the fitness of the potential solutions. The test case, presented in this paper, for the optimization technique was the Libyan power system network. In order to show the validity of the optimized defence plan, a comparison between the existing Libyan power system defence plan and the optimized defence plan is presented for the case of a major blackout in the western part of the Libyan power system that took place on 8th November 2003. The results presented in this paper show that a robust defence plan with a satisfactory amount of load shedding and system islands can be obtained by the new technique. The paper also demonstrates that the new defence plan outperforms the existing Libyan power system defence plan.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132366498","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651454
K. Kawahara, S. Yoshimoto
This paper presents a formulation of outage planning for electric power facilities treated as a combinatorial optimization problem considering power supply reliability. We utilize two indices to evaluate a security level of system configurations during outage works. The indices are defined as power supply shortage assuming N-2 contingencies and transmission loss assuming N-1 contingencies. A lot of constraints are also introduced to this problem with respect to the allocation of outage works and the determination of system configurations. Since it is expected that solving the problem is so hard due to combinatorial explosions, we apply a genetic algorithm to obtain feasible solutions. Simulation is executed to the real test system which is a part of the 110 kV transmission system belonging to Chugoku Electric Power Company (CEPCO). It seems that some results show good solutions from the viewpoint of reliability indices. However, it is not clear how far these solutions are close to the optimal ones. In order to confirm the quality of solutions, we develop a program for searching all outage work combinations on the PC cluster constructed with 5 computers. As a result, the solutions by GA show us midway between the optimum and the worst.
{"title":"A study on outage planning for electric power facilities by using GAs","authors":"K. Kawahara, S. Yoshimoto","doi":"10.1109/UPEC.2008.4651454","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651454","url":null,"abstract":"This paper presents a formulation of outage planning for electric power facilities treated as a combinatorial optimization problem considering power supply reliability. We utilize two indices to evaluate a security level of system configurations during outage works. The indices are defined as power supply shortage assuming N-2 contingencies and transmission loss assuming N-1 contingencies. A lot of constraints are also introduced to this problem with respect to the allocation of outage works and the determination of system configurations. Since it is expected that solving the problem is so hard due to combinatorial explosions, we apply a genetic algorithm to obtain feasible solutions. Simulation is executed to the real test system which is a part of the 110 kV transmission system belonging to Chugoku Electric Power Company (CEPCO). It seems that some results show good solutions from the viewpoint of reliability indices. However, it is not clear how far these solutions are close to the optimal ones. In order to confirm the quality of solutions, we develop a program for searching all outage work combinations on the PC cluster constructed with 5 computers. As a result, the solutions by GA show us midway between the optimum and the worst.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134620232","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651601
S. Nikolovski, Z. Klaić, Z. Kraus, G. Slipac
The Faculty of Electrical Engineering in Osijek and HEP d.d. - Croatian Grid Company are partners in the EU project Leonardo Power Quality Initiative (LPQI). One part of activities carried out within that project includes measuring, analyzing and statistical data processing of power quality indices. This paper presents the result of online power quality indices monitoring at HEP Distribution System Operator in TS 110/35 kV Osijek 2 at the secondary side on one of two transformers which supply the urban cable network in the city of Osijek. Power quality indices were measured with a three phase power quality network analyzer QWave Power CO. Voltage events were classified according to the EN 50160 and IEEE 1159-1995, and RMS variation performance indices were calculated.
奥西耶克电气工程学院和HEP博士-克罗地亚电网公司是欧盟项目莱昂纳多电力质量倡议(LPQI)的合作伙伴。在该项目内进行的活动的一部分包括测量、分析和统计数据处理电能质量指数。本文介绍了在奥西耶克市为城市电缆网供电的两台变压器中的一台上，在奥西耶克市的ts110 / 35kv奥西耶克2次侧，HEP配电系统运营商在线监测电能质量指标的结果。采用三相电能质量网络分析仪QWave Power CO.测量电能质量指标，按照en50160和IEEE 1159-1995标准对电压事件进行分类，计算均方根变化性能指标。
{"title":"Online power quality measurements and voltage sags analysis","authors":"S. Nikolovski, Z. Klaić, Z. Kraus, G. Slipac","doi":"10.1109/UPEC.2008.4651601","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651601","url":null,"abstract":"The Faculty of Electrical Engineering in Osijek and HEP d.d. - Croatian Grid Company are partners in the EU project Leonardo Power Quality Initiative (LPQI). One part of activities carried out within that project includes measuring, analyzing and statistical data processing of power quality indices. This paper presents the result of online power quality indices monitoring at HEP Distribution System Operator in TS 110/35 kV Osijek 2 at the secondary side on one of two transformers which supply the urban cable network in the city of Osijek. Power quality indices were measured with a three phase power quality network analyzer QWave Power CO. Voltage events were classified according to the EN 50160 and IEEE 1159-1995, and RMS variation performance indices were calculated.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134040842","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651680
M. M. Alamuti, A. Zare, M. Savaghebi
Reducing rail voltage and stray current corrosion all at once is one of the challenging problems in DC electrified rail transit systems. Stray current is the main reason of corrosion in the metallic parts located in the proximity of the railway. Choosing appropriate earthing scheme is an effective way to decrease corrosion intensity and providing safety for personnel. This paper discusses a possible alternative earthing scheme for Tehran Metro Line 3. A new earthing scheme entitled reversed diode earthed scheme is presented and compared with floating and diode earthed earthing schemes. A comparative simulation of the rail voltage and stray current corrosion level for the proposed scheme is presented. The results stipulate the excellence of the proposed method over the prevalent schemes.
{"title":"Reversed diode earthing scheme in DC traction power system","authors":"M. M. Alamuti, A. Zare, M. Savaghebi","doi":"10.1109/UPEC.2008.4651680","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651680","url":null,"abstract":"Reducing rail voltage and stray current corrosion all at once is one of the challenging problems in DC electrified rail transit systems. Stray current is the main reason of corrosion in the metallic parts located in the proximity of the railway. Choosing appropriate earthing scheme is an effective way to decrease corrosion intensity and providing safety for personnel. This paper discusses a possible alternative earthing scheme for Tehran Metro Line 3. A new earthing scheme entitled reversed diode earthed scheme is presented and compared with floating and diode earthed earthing schemes. A comparative simulation of the rail voltage and stray current corrosion level for the proposed scheme is presented. The results stipulate the excellence of the proposed method over the prevalent schemes.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129008023","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651572
H. Livani, J. Rouhi, H. Karimi-Davijani
This paper investigates possible improvements of grid voltage stability in connection of 40 MW wind farm to transmission network using VSC-HVDC. The 40 MW wind farm comprises 20 individual 2 MW permanent magnet synchronous generators. The voltage at the transmission network terminal should be re-established with minimized power losses during wind speed fluctuations and after the clearance of grid side short-circuit faults. This paper highlights a modified decoupling control strategy which is applied to VSC-HVDC converters to achieve variable speed operation and voltage stabilization in wind farm network and transmission network respectively. Simulations using PSCAD/EMTDC are performed to study behavior of wind farm, transmission network and dc link for various changes in wind speed and fault on ac grid. The simulation results validate the connection method and the modified decoupling control strategy.
{"title":"Voltage stabilization in connection of wind farms to transmission network using VSC-HVDC","authors":"H. Livani, J. Rouhi, H. Karimi-Davijani","doi":"10.1109/UPEC.2008.4651572","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651572","url":null,"abstract":"This paper investigates possible improvements of grid voltage stability in connection of 40 MW wind farm to transmission network using VSC-HVDC. The 40 MW wind farm comprises 20 individual 2 MW permanent magnet synchronous generators. The voltage at the transmission network terminal should be re-established with minimized power losses during wind speed fluctuations and after the clearance of grid side short-circuit faults. This paper highlights a modified decoupling control strategy which is applied to VSC-HVDC converters to achieve variable speed operation and voltage stabilization in wind farm network and transmission network respectively. Simulations using PSCAD/EMTDC are performed to study behavior of wind farm, transmission network and dc link for various changes in wind speed and fault on ac grid. The simulation results validate the connection method and the modified decoupling control strategy.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116874819","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 : 2008-12-16DOI: 10.1109/UPEC.2008.4651462
T. T. Nguyen, M. F. Kandlawala, A. Rahim, M. Alam
Dynamic model of a variable speed wind generation system connected to grid is developed, and its steady state and dynamic performance is explored. The performance under wind gust and three-phase fault has been studied and the amount of transient injection to the grid is also investigated. A control scheme that minimizes the transient injection through a thyristor controlled variable capacitance at the generator terminal is proposed and developed. Fuzzy logic based controller is included in its control loop. Simulation results confirmed the effectiveness of the fuzzy logic controlled variable capacitance compensation scheme.
{"title":"Power generation redispatching to improve transient stability in power systems using controllability and observability gramians","authors":"T. T. Nguyen, M. F. Kandlawala, A. Rahim, M. Alam","doi":"10.1109/UPEC.2008.4651462","DOIUrl":"https://doi.org/10.1109/UPEC.2008.4651462","url":null,"abstract":"Dynamic model of a variable speed wind generation system connected to grid is developed, and its steady state and dynamic performance is explored. The performance under wind gust and three-phase fault has been studied and the amount of transient injection to the grid is also investigated. A control scheme that minimizes the transient injection through a thyristor controlled variable capacitance at the generator terminal is proposed and developed. Fuzzy logic based controller is included in its control loop. Simulation results confirmed the effectiveness of the fuzzy logic controlled variable capacitance compensation scheme.","PeriodicalId":287461,"journal":{"name":"2008 43rd International Universities Power Engineering Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114888154","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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