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AC and DC Power Transmission, 2006. ACDC 2006. The 8th IEE International Conference on

Date 28-31 March 2006

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Displaying Results 1 - 25 of 74
  • Full-scale tests of the AC transmission system to examine the new SPS complexes

    Publication Year: 2006 , Page(s): 4 - 8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (274 KB)  

    In order to improve the transfer capability of the 220-500 kV AC transmission system that forms the power network backbone in the Russian Far East interconnected power system, two new generation system protection schemes complexes were put into operation at the Zeya and Bureya hydro power plants. Putting into operation was accompanied by the series of full-scale tests. The peculiarities of the full-scale experiments were participation of the experts from Russia, Switzerland, Italy and the USA, and implementation of diverse phasor measurement units devices and digital fault recorders produced in different countries such as the USA, Sweden, Belgium and Russia. View full abstract»

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  • Simulation of nonstandard phenomena in power systems

    Publication Year: 2006 , Page(s): 290 - 294
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (225 KB)  

    The paper deals with a comparison of two published approaches to modelling the properties of magnetic circuits leading to a dynamic description of hysteresis characteristic. The comparison of the two methods is carried out both theoretically and in practical measurements on instrument voltage transformer. The paper also deals with the possibility of employing the models for ferroresonance simulations in power systems. View full abstract»

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  • The challenges of offshore power system construction-bringing power successfully to Troll A, one of the worlds largest oil and gas platform

    Publication Year: 2006 , Page(s): 75 - 78
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (226 KB)  

    In February 2005 the world's first offshore HVDC transmission was successfully commissioned. It consists of two parallel 40 MW transmissions connecting the Troll A gas platform in the North Sea, with the mainland 132 kV grid via compact polymeric DC cables. A compact and lightweight offshore module was designed by ABB in collaboration with the client Statoil. The project has given ABB, valuable experience in the design and construction of high voltage plant in a salt laden, hostile environment. With safety as a primary consideration ABB has gained considerable experience in offshore construction techniques. The success of the ABB Troll project has been one of the key components for British Petroleum, who in June 2005 placed a second offshore HVDC Light order with ABB for their 78 MW transmission to the Valhall field. The engineering design and construction challenges overcome by ABB in these pioneering offshore projects is directly transferable to the new high power, high voltage, offshore substations required to enable, safe, reliable operation of the future very large offshore wind farms. View full abstract»

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  • Benefits and control of STATCOM with energy storage in wind power generation

    Publication Year: 2006 , Page(s): 230 - 235
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (292 KB)  

    This paper presents the design, control and analysis of a distribution STATCOM enhanced with an energy storage device (D-STATCOM-EnS) when combined with a wind farm comprising fixed speed induction generators. In this paper it is shown that the D-STATCOM-EnS, controlled via a decoupled vector control technique, is an effective way of reducing voltage flicker emissions at the point of common coupling (PCC), removing the wind speed fluctuations and improving the transient stability of a wind farm. Energy storage rating requirements are discussed in relation to the level of power quality obtained. View full abstract»

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  • Breaker

    Publication Year: 2006 , Page(s): 301
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (10 KB)  

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  • Multi-level voltage reinjection VSC HVDC transmission

    Publication Year: 2006 , Page(s): 130 - 134
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (238 KB)  

    The structure and control of a new voltage source based HVDC transmission link are described. The link uses multi-level voltage reinjection converters. It offers some advantages over PWM-VSC transmission in terms of switching efficiency and valve ratings, while providing similar levels of voltage and current waveform quality. The waveforms and dynamic performance are verified by means of PSCAD/EMTDC simulation. View full abstract»

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  • A novel concept for a fault current limiter

    Publication Year: 2006 , Page(s): 251 - 255
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (241 KB)  

    The AREVA T&D Technology Centre has proposed a novel type of fault current limiting reactor based on a laminated iron C-core with a demagnetised magnet in its airgap. The fault current limiter will automatically increase its reactance during a fault in a power system to which it is connected. In this paper, the principle used to change the magnetic nature of the device will be explained in detail. This paper will also describe the design of the fault current limiter and demonstrate its fault current limiting performance through a case study. View full abstract»

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  • Keynote - Title to be advised

    Publication Year: 2006 , Page(s): 74
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (12 KB)  

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  • Research on isolated diesel-wind power system equipped with doubly fed induction generator

    Publication Year: 2006 , Page(s): 246 - 250
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    In this paper, we focus on a MW level diesel-wind power system consisting of a wind generator equipped with doubly fed induction generator (DFIG) and a diesel generator. Compared with the conventional diesel-wind system, the response of the system equipped with DFIG during wind fluctuation and load changes is more stable, and the ability for reactive power output of DFIG can improve the reactive power control in system operation observably. The performance of isolated diesel-wind power systems can be improved effectively by enhancing the wind generators. Analysis also shows that in this kind of system, the diesel generator terminal voltage and the upper limits for reactive power output of DFIG are important operative parameters affecting the operation performance. View full abstract»

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  • Southern Africa can contribute to solving the global warming problem with its huge hydropower potential

    Publication Year: 2006 , Page(s): 210 - 214
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (287 KB)  

    Over a decade ago, some countries joined "The United Nations Framework Convention on Climate Change" and, in 1997, their governments committed themselves to control the greenhouse gases emissions under the so called Kyoto Protocol. This paper presents strategies and solutions that Southern African countries have committed themselves in order as to address the global warming phenomenon by implementing hydropower plants within a power superhighways framework. View full abstract»

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  • Table of contents

    Publication Year: 2006 , Page(s): vii - xvi
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  • Multiobjective reactive power compensation with an ant colony optimization algorithm

    Publication Year: 2006 , Page(s): 276 - 280
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (303 KB)  

    This paper presents an ant colony optimization (ACO) algorithm applied to the reactive power compensation problem in a multiobjective context. The developed algorithm was denominated Electric Omicron (EO) given that it was inspired in the Omicron ACO proposed by some of the authors. The proposed EO algorithm was compared to a variant of the SPEA (strength Pareto evolutionary algorithm), specially designed for this problem. This variant of SPEA has previously shown an excellent performance in this type of problem. Experimental results presented in this paper show that the proposed EO outperforms SPEA, i.e., EO finds better Pareto solutions considering voltage deviation and investment. As long as we know, this is the first attempt to solve the reactive power compensation problem with an ACO algorithm in a multiobjective context. View full abstract»

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  • Genetic algorithm based optimization for allocation of static VAr compensators

    Publication Year: 2006 , Page(s): 115 - 120
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    The placement of FACTS devices in a power network is of great importance to ensure the utilization of the full potential of the transmission network. In this study firstly, a static VAr compensators (SVCs) are placed optimally in a power network by taking into consideration the generation costs of both active and reactive power and the cost of the SVCs. The optimal power flow (OPF) and the genetic algorithm (GA) based optimization procedure are employed to solve the problem of optimal allocation of SVCs. Secondly, a small disturbance stability study is performed in order to investigate how installing the SVCs with additional control loops at such locations could contribute to system small disturbance stability. The study demonstrated that the optimal allocation of SVCs is a cost effective measure since the installed SVCs reduce overall generation costs and additionally contribute to the enhancement of the security of the transmission network by improving the damping of electromechanical oscillations. View full abstract»

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  • Novel robust adaptive controller based on non-quadratic Lyapunov functions for FACTS

    Publication Year: 2006 , Page(s): 261 - 265
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (245 KB)  

    Most of power control engineers and researchers who work in the area of FACTS design and control face many hurdles such as the inaccurate estimation of system parameters and ensuring an optimal stable performance in the presence of disturbances; such hurdles can not be problems any more with the aid of these new robust adaptive control loops, presented in this paper. An optimal performance can still be maintained even while using inaccurate system data, by applying new model reference adaptive control (MRAC) schemes developed by the authors. This paper presents a novel robust adaptive controller for FACTS that is able to tackle the arising uncertainty in system parameters, internal and external disturbances in power systems, while maintaining system dynamic stability which is considered as the main contribution of this work. The proposed controller employs either standard Quadratic or new non-quadratic Lyapunov functions (NQLF) that act to drive the output error signal (e1), defined as the error in the load terminal voltage, rapidly to zero. A SVC dynamic FACTS model, developed by the first author et al., is implemented in this application. Simulation results, obtained using MATLAB/SIMULINK, compare the output error signal while using fixed controller parameters with the use of robust adaptive control loops based on either quadratic Lyapunov function (QLF) or new NQLF. Obtained results confirm the capability of the suggested control technique, specially the controller based on NQLF, in restoring system dynamic stability as well as improving system performance in presence of disturbances which has not appeared in literature yet. View full abstract»

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  • Fault ride-through capability investigation of a doubly-fed induction generator with an additional series-connected voltage source converter

    Publication Year: 2006 , Page(s): 79 - 84
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (347 KB)  

    In this paper, several published protection schemes applied to fault ride-through capability of DFIGs are compared at first. The voltage sag response of a conventional DFIG with a back-to-back PWM converter connected in the rotor side has been investigated based on both a steady-state DFIG model and a full transient DFIG model in PSCAD. Furthermore, an integration scheme of a DFIG with an additional series-connected voltage source converter is proposed for improving the fault ride-though performance when a DFIG experiences a grid fault on the near side of the point of common coupling (PCC) or remote in the network. The PSCAD/EMTDC simulation results demonstrate the proposed scheme can significantly increase the whole DFIG system stability even following severe symmetrical or unsymmetrical voltage sags. View full abstract»

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  • Basslink HVDC interconnector-system design considerations

    Publication Year: 2006 , Page(s): 121 - 124
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (240 KB)  

    The Basslink HVDC interconnector is a major Australian energy initiative that will allow the exchange of electricity between the island of Tasmania and the mainland of Australia. This paper highlights some key aspects of the project starting from its rationale, describing critical system design criteria, how the stringent power quality requirements (frequency control, harmonics, flicker etc) were addressed and further portrays related considerations for vital components. View full abstract»

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  • Improved power system stability and reliability using innovative energy storage technologies

    Publication Year: 2006 , Page(s): 220 - 224
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    Power transmission and distribution systems are facing an increased amount of renewable generation where the power generated varies depending on the available wind, waves or solar radiation. This creates new challenges for the stable and reliable operation of the power system, requiring, in many instances, network reinforcement to maintain network reliability. Energy storage will increasingly play an important role in economically managing power networks to meet demand and maintain supply reliability during these generation and demand fluctuations. In this paper, we will examine a combination of two of the most important factors in the operation of a reliable power system: reactive power, used for voltage and stability control, combined with energy storage in order to balance the active power production, e.g. from intermittent renewable generation sources. View full abstract»

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  • Use of wide area monitoring, protection and control systems to supervise and maintain power system stability

    Publication Year: 2006 , Page(s): 200 - 203
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (286 KB)  

    While transmission grid assets are more and more pushed towards their limits, the use of WAM systems to supervise and maintain high voltage grid stability has won significant attention. This paper introduces the concepts of WAM systems, it describes stability assessment solutions based on phasor measurement data and gives insight into experiences gained with actual WAM system installations in Europe and Asia. Conclusions are drawn for WAM system design requirements allowing the stepwise upgrading from monitoring to protection and control functionality. View full abstract»

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  • First major 275 kV XLPE cable system in the UK

    Publication Year: 2006 , Page(s): 105 - 109
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (287 KB)  

    Commissioned in 2004, a strategic EHV XLPE cable system installed in Glasgow represents three significant advances at the 275 kV level: 1) first 275 kV XLPE long route project in the UK. 2) first significant use of XLPE joints in a UK 275 kV system. 3) use of pre-installed unfilled ducting, which hitherto has been applied only at lower voltage levels. This paper describes the background to and implementation of the project. View full abstract»

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  • Advertisements

    Publication Year: 2006 , Page(s): i
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (23 KB)  

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  • Control of voltage source converters with an unbalanced supply system

    Publication Year: 2006 , Page(s): 155 - 161
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (345 KB)  

    Voltage source converters (VSCs) are becoming more common in electric power system transmission and distribution systems, due to their good controllability, useful electrical characteristics, and falling cost. They are often connected to a slightly unbalanced AC network, which results in harmonics being generated and propagated through the network. This paper presents a linearised frequency coupling matrix (FCM) approach to the analysis of harmonic generation under unbalanced AC conditions, and uses it to determine the best control response under these conditions. Both PWM and six pulse converters are analysed and compared. View full abstract»

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  • Offshore wind farm based on variable frequency mini-grids with multiterminal DC interconnection

    Publication Year: 2006 , Page(s): 215 - 219
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    This paper studies a large offshore wind farm interconnected to the grid using a multiterminal HVDC link. The 200 W wind farm consists of 100 individual 2 MW turbines connected using 25 CSI (current source inverters) to a common DC link. Since The CSI converters are in series connection, no generator transformers are needed to elevate the voltage. The transmission system converters enable regulation of the generator speed. The converters are not needed with individual generators, implying that simple permanent magnet generators can be used. The paper presents PSCAD simulation for various changes in wind speeds. The results confirm the ability to operate at optimum coefficient of performance and that there are no synchronization problems even for severe wind speed changes. The proposed concept may enable integration of large offshore wind farms at considerable distances, and using optimal number of converters. View full abstract»

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  • Fault location techniques for one of the World's longest AC interconnector cables

    Publication Year: 2006 , Page(s): 14 - 18
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (249 KB)  

    The electrical distribution system on the Isle of Man is linked to the UK power system via a 90 kV AC subsea interconnect cable. The total length of the interconnector is approximately 108 km of which about 104 km is subsea cable. Because of the importance of this installation the Manx Electricity Authority requires a strategy to deal with any fault that may arise with this cable. In the event of a fault one of the first requirements would be to determine a reliable estimate of the actual fault location on which the remaining actions would then depend. It was found that the extremely long length of cable posed its own difficulties in this respect and that fault location equipment designed for much shorter cables routes would not be suitable. The Manx Electricity Authority therefore initiated a programme of work to build a theoretical model to predict the magnitude of the time domain reflectometery, TDR pulse likely to be effective over the whole length of the cable and then carry out field trials of TDR measurements during a maintenance outage. Using specialist pulse generators and a high-speed storage oscilloscope during this outage it was possible to locate the remote end and a known subsea joint at about 60 km from the test point. The joint was located to within 150 m of the position determined from the installation records, an accuracy of 0.14% of the total length. View full abstract»

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  • Copyright

    Publication Year: 2006 , Page(s): iii - v
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (99 KB)  

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  • A novel transient based protection for ±800 kV UHVDC transmission lines

    Publication Year: 2006 , Page(s): 281 - 284
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (206 KB)  

    A novel transient based protection for ±800 kV UHVDC transmission lines is proposed in the paper. A ±800 kV UHVDC bipolar model with DC control system is built with PSCAD/EMTDC software. Wavelet-multiresolution signal decomposition technique is applied to analyze the transient voltages. Based on spectral energy distribution of transient voltages, the criteria are presented to distinguish the UHVDC line faults from other transient phenomena. Extensive simulations are used to test the criteria. The results show the proposed transient based protection is highspeed, reliable and suitable for UHVDC lines. View full abstract»

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