The Experts below are selected from a list of 4416 Experts worldwide ranked by ideXlab platform
Hossein Khalilnezhad - One of the best experts on this subject based on the ideXlab platform.
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influence of long ehv ac underground cables on the resonance behavior of the dutch transmission system
Power and Energy Society General Meeting, 2016Co-Authors: Hossein Khalilnezhad, Lou Van Der Sluis, Marjan Popov, Jan P W De JongAbstract:Application of long EHV XLPE underground cables has divers effects on the transient behavior of transmission grids, mainly due to their large capacitive Shunt impedance. Low-order resonance frequencies are one of the features of long c ables that deserve special attention. This paper investigates the resonance behavior of partial cable-based EHV networks by simulating a 380 kV double-circuit mixed OHL-cable connection in the future Dutch transmission system. The Sweep Frequency Response Analysis (SFRA) is performed for the distributed frequency-dependent parameter model of the whole Dutch 380 kV grid with and without cables in the case study project. The analysis is carried out for different cabling scenarios (i.e. different cable lengths) and for several sensitivity analyses including the influence of Shunt Compensation size, Shunt Compensation location, and mixed-line configuration on the resonance behavior of the grid. The results are compared in terms of order of first harmonic resonance frequency and number of resonance frequencies. The EMT studies are carried out in the PSCAD environment.
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influence of long ehv ac underground cables on the resonance behavior of the dutch transmission system
Power and Energy Society General Meeting, 2016Co-Authors: Hossein Khalilnezhad, Lou Van Der Sluis, Marjan Popov, Jan P W De JongAbstract:Application of long EHV XLPE underground cables has divers effects on the transient behavior of transmission grids, mainly due to their large capacitive Shunt impedance. Low-order resonance frequencies are one of the features of long c ables that deserve special attention. This paper investigates the resonance behavior of partial cable-based EHV networks by simulating a 380 kV double-circuit mixed OHL-cable connection in the future Dutch transmission system. The Sweep Frequency Response Analysis (SFRA) is performed for the distributed frequency-dependent parameter model of the whole Dutch 380 kV grid with and without cables in the case study project. The analysis is carried out for different cabling scenarios (i.e. different cable lengths) and for several sensitivity analyses including the influence of Shunt Compensation size, Shunt Compensation location, and mixed-line configuration on the resonance behavior of the grid. The results are compared in terms of order of first harmonic resonance frequency and number of resonance frequencies. The EMT studies are carried out in the PSCAD environment.
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influence of partial undergrounding on the transient stability of ehv power transmission systems
Electric Power Systems Research, 2016Co-Authors: Hossein Khalilnezhad, Marjan Popov, Kees P J JansenAbstract:Abstract This paper investigates the transient stability issues that may occur when long underground cables are added to EHV transmission systems. Dynamic behaviour of generators and terminal voltages with respect to various disturbances like cable disconnection/connection and fault currents are studied. Simulations are performed for the 2020 model of the Dutch transmission grid. The effects of partial undergrounding in two case studies with the total transmission length of 280 km are investigated. This work proposes criteria for accurate sizing of cable Shunt Compensation for dynamic simulation purposes based on grid voltages, generator reactive powers and power exchange with neighbouring grids. Moreover, a comparison between the dynamic behaviour of system variables for three different Shunt Compensation arrangements including line-end Compensation, line-end middle Compensation, and cable-end Compensation is performed. Finally, a specific switching sequence for line disconnection/connection to improve voltage profiles and generator behaviours is introduced. The simulations are performed in PSS®E environment.
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Shunt Compensation design of EHV double-circuit mixed OHL-cable connections
IET International Conference on Resilience of Transmission and Distribution Networks (RTDN) 2015, 2015Co-Authors: Hossein Khalilnezhad, Jan P W De Jong, Marjan Popov, S. Chen, Jorrit A. Bos, L. Van Der SluisAbstract:This paper deals with the Shunt Compensation design of long 380kV-50Hz XLPE cables by simulating a double-circuit partially cabled connection with the transmission length of 80 km in the Dutch transmission system. The proposed procedure for Shunt Compensation sizing is fully elaborated in this paper. Four sizing criteria are used to find the minimum required size of Compensation. All simulations are performed for different cable lengths. Moreover, different Compensation arrangements including line-end and distributed arrangements are compared in terms of minimum required Compensation size. Finally, the influence of mixed-line configuration, i.e. the number and the location of cable sections, on the minimum required Compensation size is investigated by simulating five mixed-line configurations. All simulations are performed for two load-flow scenarios representing two extreme situations in the future planning of the Dutch transmission grid.
P.r. Bijwe - One of the best experts on this subject based on the ideXlab platform.
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Self-excited oscillations in series and Shunt Compensation schemes of ac transmission systems
International Journal of Electrical Power & Energy Systems, 1997Co-Authors: C. S. Indulkar, K. Ramalingam, P.r. BijweAbstract:Abstract A new mathematical model is presented for analysis of self-excited oscillations in a synchronous machine connected to a long EHV transmission line with different configurations of series and Shunt Compensation. The model has been developed in terms of line constants of long lines which includes the effect of line Shunt susceptance and reactance of line end transformers. The model has been used to directly analyse self-excited oscillations in a transmission system for five types of Compensation scheme. The stability limit curves in the R-X c parametric plane for the five Compensation schemes have been compared with that for a series compensated transmission line.
C. S. Indulkar - One of the best experts on this subject based on the ideXlab platform.
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Required Shunt Compensation for an EHV transmission line
IEEE Power Engineering Review, 1999Co-Authors: C. S. IndulkarAbstract:We determine the Shunt Compensation at the load end of a long transmission line to maintain the load voltage at a fixed percentage of the sending-end voltage. We use the long-line model to determine the critical power that the line can transmit with and without series Compensation.
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Self-excited oscillations in series and Shunt Compensation schemes of ac transmission systems
International Journal of Electrical Power & Energy Systems, 1997Co-Authors: C. S. Indulkar, K. Ramalingam, P.r. BijweAbstract:Abstract A new mathematical model is presented for analysis of self-excited oscillations in a synchronous machine connected to a long EHV transmission line with different configurations of series and Shunt Compensation. The model has been developed in terms of line constants of long lines which includes the effect of line Shunt susceptance and reactance of line end transformers. The model has been used to directly analyse self-excited oscillations in a transmission system for five types of Compensation scheme. The stability limit curves in the R-X c parametric plane for the five Compensation schemes have been compared with that for a series compensated transmission line.
Andrey N. Belyaev - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Operation and Stability of Ultra-long Transmission Lines with Controlled Shunt Compensation
2019 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus), 2019Co-Authors: Anastasia V. Golovina, Oleg O. Pereslytskikh, Anna S. Rodionova, Andrey N. BelyaevAbstract:The study of operation and stability of ultra-long AC transmission line with maximum length of 4000 km with controlled Shunt Compensation has been carried out. It is shown that parallel operation of static var compensators / controlled Shunt reactors and low capacity synchronous condenser in one node allows to realize active power transfer that is larger than surge impedance level by 10-40%. Synchronized coordination for static var compensator control systems as well as generator and condenser PSS settings is performed on the basis of eigenvalue shift approach. It is demonstrated that simultaneous optimization of control system parameters together with compensator time response allows to enlarge the limit of transmitted power up to 1.1 p.u. and reach improved level of small signal stability. By increasing condenser capacity twice, limit of active power is achieved to 1.2 p.u.
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Operating condition analysis of flexible AC transmission lines with controlled series and Shunt Compensation devices
2018 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus), 2018Co-Authors: Petr V. Chernyaev, Maxim A. Khazov, Andrey N. BelyaevAbstract:The study of operating conditions and small signal stability of flexible AC transmission lines with controlled series and Shunt Compensation is carried out. It is shown that implementation of controlled Shunt Compensation devices in addition to existing series ones allows to increase transmission power limit by almost twice, provided that voltage levels are kept within permissible limits. The minimally possible optimal composition and location of controlled Shunt Compensation devices is established to ensure the operation of power transmission in a wide range of power transmission. The set of measures aimed at increasing stability margin is justified. The joint coordination of tuning parameters of the series and Shunt control devices is implemented.
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Stability of ultra long distance AC power transmission lines with controlled Shunt Compensation devices
2018 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus), 2018Co-Authors: Andrey N. Belyaev, Kseniya A. Izotova, Ivan V. KashinAbstract:An overview of AC and DC transmission systems in China has been made and it is shown that many DC transmissions from 2500 to 4400 km can successfully be substituted by AC ones with certain set of controlled Shunt Compensation devices. Investigations of operating conditions and small signal stability for ultra long-distance power transmission lines as well as analysis of transient processes have been carried out. It is shown, that parallel operation of controlled Shunt reactor and synchronous compensator at one node significantly expands the range of possible line lengths and allows the implementation of power transmission modes close to surge impedance power. A special line property, associated with impossibility of long line operation only with static Compensation devices, at full angle of transmissions larger than 180 electrical degrees, does not appear in such a scheme.
Subhashish Bhattacharya - One of the best experts on this subject based on the ideXlab platform.
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Shunt Compensation
IEEE Industrial Electronics Magazine, 2009Co-Authors: Avik Bhattacharya, Chandan Chakraborty, Subhashish BhattacharyaAbstract:This article has surveyed some of the most important techniques used to generate the reference current for the Shunt-type APF (active power filter). The GA-based approach is discussed in detail. Zero-crossing detection of one of the source voltages is sufficient, and the PLL may be removed. An ANN-based PI controller is added for faster buildup of the voltage across the capacitor. Faster control of the capacitor-voltage reduces the size of the capacitor and also improves the bandwidth of the controller. The proposed technique is simulated (in Simulink) and is also experimentally confirmed by developing a dSPACE1104-based prototype. With the availability of low-cost and high-speed processors, such computationally extensive methods are expected to be popular in the future.
