Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745290
B. Murthy, P. Yemula, S. Khaparde
The transmission expansion planning (TEP) has long term effects on system performance. The effects are irreversible. The conventional optimization techniques have convergence problems for large system and heuristic methods reported so far are not holistic in nature. This paper proposes a two level approach. At first level, the usual static solution using linear approach is proposed. The objective is to minimize the cost along with overloads. The isolated nodes are handled by ZBUS formulation as described. The genetic algorithm (GA) is used as a heuristic approach to arrive at results. The plans are shortlisted with no overloads and least cost. The performance is tested for high rank contingencies and appropriate system strengthening is suggested. At second level, further strengthening of the network on short term basis is done with due consideration to reactive power balance in the grid. The reactive power support has to be incorporated since the AC model with reactive power limits can impose convergence problems. To overcome this, reactive power compensation (RPC) enhanced FDLF module with integrated reactive power planning based on set of heuristics is implemented. The TEP plans need to be evaluated for reactive power balance. This is accomplished by evaluating voltage stability margin index (VSMI). It identifies weaker lines prone to reactive power imbalance. The TEP plan reinforces grid to improve the weaker section. The proposed methodology is applied to IEEE 46-bus test system and results are discussed.
TEP (transmission expansion planning)对系统性能的影响是长期的。其影响是不可逆转的。传统的优化技术对于大系统存在收敛性问题，目前报道的启发式方法在本质上不是全局性的。本文提出了一个两层次的方法。首先，提出了常用的线性静态解。目标是最小化成本和过载。隔离节点按描述的ZBUS公式处理。遗传算法(GA)作为一种启发式方法来获得结果。入围的计划没有超载，成本最低。对高级别突发事件进行了性能测试，并提出了适当的系统强化建议。二是考虑电网无功平衡，短期内进一步加强电网。由于具有无功功率限制的交流模型可能会造成收敛问题，因此必须纳入无功功率支持。为解决这一问题，实现了无功补偿(RPC)增强FDLF模块，并基于一组启发式算法集成了无功规划。需要对TEP计划进行无功平衡评估。这是通过评估电压稳定裕度指数(VSMI)来实现的。它可以识别容易产生无功功率不平衡的较弱线路。TEP计划加强电网以改善较弱的部分。将该方法应用于IEEE 46总线测试系统，并对测试结果进行了讨论。
{"title":"A Comprehensive Two Level Heuristic Approach to Transmission Expansion Planning","authors":"B. Murthy, P. Yemula, S. Khaparde","doi":"10.1109/ICPST.2008.4745290","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745290","url":null,"abstract":"The transmission expansion planning (TEP) has long term effects on system performance. The effects are irreversible. The conventional optimization techniques have convergence problems for large system and heuristic methods reported so far are not holistic in nature. This paper proposes a two level approach. At first level, the usual static solution using linear approach is proposed. The objective is to minimize the cost along with overloads. The isolated nodes are handled by ZBUS formulation as described. The genetic algorithm (GA) is used as a heuristic approach to arrive at results. The plans are shortlisted with no overloads and least cost. The performance is tested for high rank contingencies and appropriate system strengthening is suggested. At second level, further strengthening of the network on short term basis is done with due consideration to reactive power balance in the grid. The reactive power support has to be incorporated since the AC model with reactive power limits can impose convergence problems. To overcome this, reactive power compensation (RPC) enhanced FDLF module with integrated reactive power planning based on set of heuristics is implemented. The TEP plans need to be evaluated for reactive power balance. This is accomplished by evaluating voltage stability margin index (VSMI). It identifies weaker lines prone to reactive power imbalance. The TEP plan reinforces grid to improve the weaker section. The proposed methodology is applied to IEEE 46-bus test system and results are discussed.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130903609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745387
Vishal Verma, Lovely Goyal, Bhim Singh
Distribution system has witnessed numerous problems due to concentrated power loading in cities. Stability, reliability, peak demand, poor power quality, unbalanced loading are some of the major issues besides handling of large AC networks. This paper proposes an insertion of DC power dam connected between transmission and distribution system, through bidirectional voltage source converter (VSC) both on transmission and distribution sides at multiple places, to provide the comprehensive solution to the problems of interconnected AC distribution network. A study has been done through MATLAB simulation and results are presented for solutions to problems witnessed by the distribution system. A new simplified current control technique is also presented for realization of simulation model of the system.
{"title":"Voltage Source Converter Based Multi Terminal DC Sub-transmission System for City Infeed","authors":"Vishal Verma, Lovely Goyal, Bhim Singh","doi":"10.1109/ICPST.2008.4745387","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745387","url":null,"abstract":"Distribution system has witnessed numerous problems due to concentrated power loading in cities. Stability, reliability, peak demand, poor power quality, unbalanced loading are some of the major issues besides handling of large AC networks. This paper proposes an insertion of DC power dam connected between transmission and distribution system, through bidirectional voltage source converter (VSC) both on transmission and distribution sides at multiple places, to provide the comprehensive solution to the problems of interconnected AC distribution network. A study has been done through MATLAB simulation and results are presented for solutions to problems witnessed by the distribution system. A new simplified current control technique is also presented for realization of simulation model of the system.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131139646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745372
Fengge Zhang, Yuxin Wang, E. Shang
Aiming at the problem to generate difficultly steady electric energy in wind solar hybrid power system (WSHGS), the management and control method based on the battery power control is discussed. The system designed in this paper realizes the control for battery intelligent charging and discharging process by the system software and PIC16F877 signal chip computer. The hardware design scheme is given too in this paper. The emulation of the control system is carried out by simulation tool. The simulation results show that the system controller can manage the batteries charging and discharging well, so the batteries' life will be longer.
{"title":"Design and Realization of Controller in Wind Solar Hybrid Generating System","authors":"Fengge Zhang, Yuxin Wang, E. Shang","doi":"10.1109/ICPST.2008.4745372","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745372","url":null,"abstract":"Aiming at the problem to generate difficultly steady electric energy in wind solar hybrid power system (WSHGS), the management and control method based on the battery power control is discussed. The system designed in this paper realizes the control for battery intelligent charging and discharging process by the system software and PIC16F877 signal chip computer. The hardware design scheme is given too in this paper. The emulation of the control system is carried out by simulation tool. The simulation results show that the system controller can manage the batteries charging and discharging well, so the batteries' life will be longer.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124847871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745364
A. Kumar, K. Padiyar
Chain cell converter as a shunt connected, multilevel voltage source converter has been proposed for static VAR compensation. This converter consists of identical H-bridge building blocks (HBBBs) connected in series in each phase. Chain cell converter synthesizes a desired ac waveform from several levels of DC voltages provided by the DC capacitors with only one switching per cycle. The transient model of the converter is developed considering a three phase three wire system. The analysis and design of converter controls is presented. DC voltage balancing strategy which involves pulse swapping is implemented. Simulations are carried out for the performance evaluation of converter controls. Chain cell converter is also tested, when connected in a distribution system, as a STATCOM to compensate the voltage flicker due to an arc furnace load.
{"title":"Modeling, Analysis and Control of a Chain Cell Converter","authors":"A. Kumar, K. Padiyar","doi":"10.1109/ICPST.2008.4745364","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745364","url":null,"abstract":"Chain cell converter as a shunt connected, multilevel voltage source converter has been proposed for static VAR compensation. This converter consists of identical H-bridge building blocks (HBBBs) connected in series in each phase. Chain cell converter synthesizes a desired ac waveform from several levels of DC voltages provided by the DC capacitors with only one switching per cycle. The transient model of the converter is developed considering a three phase three wire system. The analysis and design of converter controls is presented. DC voltage balancing strategy which involves pulse swapping is implemented. Simulations are carried out for the performance evaluation of converter controls. Chain cell converter is also tested, when connected in a distribution system, as a STATCOM to compensate the voltage flicker due to an arc furnace load.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"33 9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124806891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745245
Daochun Huang, J. Ruan
The ultra high voltage (UHV) direct current (DC) transmission developments in China are simply introduced in this paper. The demand of UHV DC transmission and development plan in China are simply discussed. The design parameters and construction of UHV DC test bases, including test facilities, the tests that can be carried out; UHV DC test and demonstration lines; design and manufacture of UHV DC equipment are also introduced in this paper.
{"title":"Recent Developments of UHV DC Transmission Research in China","authors":"Daochun Huang, J. Ruan","doi":"10.1109/ICPST.2008.4745245","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745245","url":null,"abstract":"The ultra high voltage (UHV) direct current (DC) transmission developments in China are simply introduced in this paper. The demand of UHV DC transmission and development plan in China are simply discussed. The design parameters and construction of UHV DC test bases, including test facilities, the tests that can be carried out; UHV DC test and demonstration lines; design and manufacture of UHV DC equipment are also introduced in this paper.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122979869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745192
S. Pandya, J. K. Chatterjee
Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over the conventional direct torque control (conventional DTC). SVPWM DTC technique is helpful in solving the basic issues of torque ripple and variable switching frequency present in the conventional DTC. Three PI controllers one each for speed, torque and flux feedback loops is used in SVPWM DTC based IM drive. The major issue related with SVPWM DTC based IM drive is the proper setting of the parameters in speed, torque and flux control loops. As they are inter-dependent in nature, their parameter setting is a tricky issue. No proven technique is available to address this issue and so it can be observed that because of the lack of proper parameter settings, the induction motor drive performance is affected in terms of higher torque ripple. In present work an attempt is made to address this problem using the frequency analysis technique. Simulation results for the SVPWM DTC based on this method and conventional DTC are compared. Hardware results validate the simulation result and hence proposed technique.
{"title":"Torque Ripple Minimization in Direct Torque Control based IM Drive Part-I: Single-rate Control Strategy","authors":"S. Pandya, J. K. Chatterjee","doi":"10.1109/ICPST.2008.4745192","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745192","url":null,"abstract":"Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over the conventional direct torque control (conventional DTC). SVPWM DTC technique is helpful in solving the basic issues of torque ripple and variable switching frequency present in the conventional DTC. Three PI controllers one each for speed, torque and flux feedback loops is used in SVPWM DTC based IM drive. The major issue related with SVPWM DTC based IM drive is the proper setting of the parameters in speed, torque and flux control loops. As they are inter-dependent in nature, their parameter setting is a tricky issue. No proven technique is available to address this issue and so it can be observed that because of the lack of proper parameter settings, the induction motor drive performance is affected in terms of higher torque ripple. In present work an attempt is made to address this problem using the frequency analysis technique. Simulation results for the SVPWM DTC based on this method and conventional DTC are compared. Hardware results validate the simulation result and hence proposed technique.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"30 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114113779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745243
Huaren Wu, Qi Wang, Xiaohui Li
A rotor speed of remote generator is used as wide area measurement signal in this paper. The signal is detected and transmitted by the phasor measurement unit (PMU). The wide area signal inputs to the local power system stabilizer (PSS) to regulate the generator excitation and enhancing the power system damping. The gains of the wide area controller are determined by solving linear matrix inequalities (LMI). The LMI solving method is introduced for the wide area control of power systems. A proportional plus derivative network is used to compensate the communication delay. Kundur's four-machine two-area system is used to test the performance of the wide area damping control. The simulation results show that the wide area control can improve power system stability.
{"title":"PMU-Based Wide Area Damping Control of Power Systems","authors":"Huaren Wu, Qi Wang, Xiaohui Li","doi":"10.1109/ICPST.2008.4745243","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745243","url":null,"abstract":"A rotor speed of remote generator is used as wide area measurement signal in this paper. The signal is detected and transmitted by the phasor measurement unit (PMU). The wide area signal inputs to the local power system stabilizer (PSS) to regulate the generator excitation and enhancing the power system damping. The gains of the wide area controller are determined by solving linear matrix inequalities (LMI). The LMI solving method is introduced for the wide area control of power systems. A proportional plus derivative network is used to compensate the communication delay. Kundur's four-machine two-area system is used to test the performance of the wide area damping control. The simulation results show that the wide area control can improve power system stability.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122085358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745263
R. Bharanikumar, R. Senthilkumar, A. Nirmal Kumar
This paper presents a Z-source inverter for wind energy conversion system. The main thrust in wind energy conversion system (WECS) is to maintain a constant voltage at the output in spite of variation in wind velocity. The Z-source inverter has been identified to exhibit in steady-state, both voltage buck-and boost-capabilities. It employs a unique impedance network included between the dc power source and converter circuit. The power conversion efficiency of Z-source inverter is appreciably improved because of the traditional three-stage conversion system, consist of rectifier, boost chopper and inverter, replaced by a two stage conversion systems comprising of rectifier and Z-source inverter. All the traditional pulse width-modulation (PWM) schemes can be used to control the Z-source inverter. When the dc voltage is high enough to generate the desired ac output voltage, normal PWM is used. While the dc voltage is not enough to directly generate a desired output voltage, a modified PWM with shoot-through zero states is employed to boost the voltage. The proposed Z-source inverter with PMG and wind turbine is modeled and simulated using MATLAB/SIMULINK.
{"title":"Impedance Source Inverter for Wind Turbine Driven Permanent Magnet Generator","authors":"R. Bharanikumar, R. Senthilkumar, A. Nirmal Kumar","doi":"10.1109/ICPST.2008.4745263","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745263","url":null,"abstract":"This paper presents a Z-source inverter for wind energy conversion system. The main thrust in wind energy conversion system (WECS) is to maintain a constant voltage at the output in spite of variation in wind velocity. The Z-source inverter has been identified to exhibit in steady-state, both voltage buck-and boost-capabilities. It employs a unique impedance network included between the dc power source and converter circuit. The power conversion efficiency of Z-source inverter is appreciably improved because of the traditional three-stage conversion system, consist of rectifier, boost chopper and inverter, replaced by a two stage conversion systems comprising of rectifier and Z-source inverter. All the traditional pulse width-modulation (PWM) schemes can be used to control the Z-source inverter. When the dc voltage is high enough to generate the desired ac output voltage, normal PWM is used. While the dc voltage is not enough to directly generate a desired output voltage, a modified PWM with shoot-through zero states is employed to boost the voltage. The proposed Z-source inverter with PMG and wind turbine is modeled and simulated using MATLAB/SIMULINK.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"67 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125932730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745256
B. Ravikumar, D. Thukaram, H. Khincha
In this paper, a new approach to enhance the transmission system distance relay co-ordination is presented. The approach depends on the apparent impedance loci seen by the distance relay during all possible disturbances. In a distance relay, the impedance loci seen at the relay location is obtained by extensive transient stability studies. Support vector machines (SVMs), a class of patterns classifiers are used in discriminating zone settings (zone-1, zone-2 and zone-3) using the signals to be used by the relay. Studies on a sample 9-bus are presented for illustrating the proposed scheme.
{"title":"Distance Relay Co-ordination Using Support Vector Machines in Power Transmission System","authors":"B. Ravikumar, D. Thukaram, H. Khincha","doi":"10.1109/ICPST.2008.4745256","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745256","url":null,"abstract":"In this paper, a new approach to enhance the transmission system distance relay co-ordination is presented. The approach depends on the apparent impedance loci seen by the distance relay during all possible disturbances. In a distance relay, the impedance loci seen at the relay location is obtained by extensive transient stability studies. Support vector machines (SVMs), a class of patterns classifiers are used in discriminating zone settings (zone-1, zone-2 and zone-3) using the signals to be used by the relay. Studies on a sample 9-bus are presented for illustrating the proposed scheme.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126985638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745228
Zha Kunpeng, Wen Jia-liang, Yang Xiaonan, Gao Chong, T. Guangfu
The paper mainly described the upgrade study of High Power Electronics Laboratory (HPEL) in China Electric Power Research Institute (CEPRI), which will meet all the test requirements of plusmn 800 kV UHVDC valves. Based on the valves electrical parameters of plusmn 800 kV UHVDC demonstration project in China, the paper studied the UHVDC valve type test technology, gave the valve test parameters, the main equipments topologies, rated parameters and the basic waveshapes of the UHVDC valve insulation and operational tests.
{"title":"Upgrade Study of High Power Electronics Laboratory for ±800kV UHVDC Valves","authors":"Zha Kunpeng, Wen Jia-liang, Yang Xiaonan, Gao Chong, T. Guangfu","doi":"10.1109/ICPST.2008.4745228","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745228","url":null,"abstract":"The paper mainly described the upgrade study of High Power Electronics Laboratory (HPEL) in China Electric Power Research Institute (CEPRI), which will meet all the test requirements of plusmn 800 kV UHVDC valves. Based on the valves electrical parameters of plusmn 800 kV UHVDC demonstration project in China, the paper studied the UHVDC valve type test technology, gave the valve test parameters, the main equipments topologies, rated parameters and the basic waveshapes of the UHVDC valve insulation and operational tests.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131501631","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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