Grid Integration Scenarios for Superconducting DC Transmission Systems (original) (raw)
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IEEE Transactions on Applied Superconductivity, 2018
This paper deals with the appropriate modeling and control strategy of a multiterminal dc transmission (MTDC) system that incorporates high-temperature superconducting (HTS) dc cables. The system is based on voltage source converters for the interconnection of stiff ac grids. An overview of the high voltage direct current power transfer technology along with the possibilities it enables, as well as an introduction to the concept of multiterminal topology are presented. The operation principles of the superconducting technology are described and the control strategy of HTS-based MTDC networks is presented. To validate the performance and the dynamic response of the system under steady state as well as under fault and load change conditions, a typical four-terminal MTDC network in ring topology is developed in MATLAB/Simulink.
High-temperature superconducting DC networks
IEEE Transactions on Appiled Superconductivity, 1994
Absfruct-High-temperature superconducting dc networks are studied as a feasible alternative to ac power transmission systems. The dc network operates at generation voltages allowing direct connection of the generators to the rectifiers, eliminating the need for high-voltage insulation and transformers. The dc system is based on a mesh-connected low-voltage high-current superconducting dc transmission network supplied by unit-connected generators. The dc system feeds many small inverters that pass controlled levels of real and reactive power to ac loads. This paper presents an overview of superconducting low-voltage dc transmission systems, starting with a discussion of the dc system. This discussion is followed by an overview of the operation of ac distribution systems connected to the superconducting dc mesh and then inverter topologies and control strategies required for interfacing the ac distribution systems to the dc mesh. The paper presents a conceptual overview of the operation of the system based on simulation studies. I. INTRODUCTION E discovery of high-temperature superconductivity tion to the power area. One such application, low-voltage power transmission, is the subject of this paper. The complete superconducting power system would operate at optimum generator voltages, resulting in a single voltage level from generation to distribution subsystems. Lowvoltage operation eliminates the need for high-voltage insulation and large transformers, and removes the 12R losses from the transmission system. Implementing an ac transmission system with high-temperature superconductors results in hysteretic losses in the superconductor and eddy current losses in the copper or aluminum matrix surrounding the superconducting material. Current levels may then be restricted to reduce losses, and the system voltage level will need to increase to transfer the same amount of power. Long ac transmission lines and cables require reactive compensation (shunt or series connected capacitors and inductors) to maintain T" [ l ] has sparked a great deal of interest in its applica
Feasibility of Electric Power Transmission by DC Superconducting Cables
IEEE Transactions on Applied Superconductivity, 2005
The electrical characteristics of dc superconducting cables of two power ratings were studied: 3 GW and 500 MW. Two designs were considered for each of the two power ratings. In the first design, the SUPPLY stream of the cryogen is surrounded by the high-voltage high-temperature superconductor cylinder. The RETURN stream of the cryogen is on the grounded side of the system. In the second design, both the SUPPLY and the RETURN streams of the cryogen are on the grounded side of the cable. Two electrical characteristics of these cables were studied: 1) fault currents and 2) current harmonics. It was concluded that neither the fault currents nor the current harmonics pose any problems in the operation of the dc superconducting cables.
A new concept for superconducting DC transmission from a wind farm
Physica C: Superconductivity, 2002
Projects with large offshore wind farms (up to 500 MW) are in progress. Connecting the parks to the power grid with conventional AC transmission technique is difficult due to non-controllable power flow and voltage stability problems. A new concept for connecting remotely located wind farms is suggested and described. The concept is based on combining superconducting DC power transmission and cooled power electronic.
Physica C: Superconductivity, 2013
The combination of a high temperature superconducting DC power cable and a voltage source converter based HVDC (VSC-HVDC) creates a new option for transmitting power with multiple collection and distribution points for long distance and bulk power transmissions. It offers some greater advantages compared with HVAC or conventional HVDC transmission systems, and it is well suited for the grid integration of renewable energy sources in existing distribution or transmission systems. For this reason, a superconducting DC transmission system based HVDC transmission technologies is planned to be set up in the Jeju power system, Korea. Before applying this system to a real power system on Jeju Island, system analysis should be performed through a real time test. In this paper, a model-sized superconducting VSC-HVDC system, which consists of a small model-sized VSC-HVDC connected to a 2 m YBCO HTS DC model cable, is implemented. The authors have performed the real-time simulation method that incorporates the model-sized superconducting VSC-HVDC system into the simulated Jeju power system using Real Time Digital Simulator (RTDS). The performance analysis of the superconducting VSC-HVDC systems has been verified by the proposed test platform and the results were discussed in detail.
Superconducting power link for power transmission and fault current limitation
Physica C: Superconductivity, 2001
Superconducting power links (SUPERPOLI) will oer the opportunity for low-loss power transmission of high nominal currents and fault current limitation simultaneously in a single device. This paper presents the status of European SUPERPOLI project where the long term goal is to build a GVA class, 20 kV, three-phased, 200 m long superconducting power link. As a step towards the GVA-class application, a one-phase demonstrator of 2 m length for 20 kV, 2±5 kA rms operation has been designed and is now under construction. The project includes the development of two alternative low-ac-loss conductor designs suitable for current limitation: a tubular Bi-2212 bulk conductor with moderate J c and a tubular YBCO coated conductor with high J c . Ó
Physica C: Superconductivity, 2012
The combination of a high temperature superconducting DC power cable and a voltage source converter based HVDC (VSC-HVDC) creates a new option for transmitting power with multiple collection and distribution points for long distance and bulk power transmissions. It offers some greater advantages compared with HVAC or conventional HVDC transmission systems, and it is well suited for the grid integration of renewable energy sources in existing distribution or transmission systems. For this reason, a superconducting DC transmission system based HVDC transmission technologies is planned to be set up in the Jeju power system, Korea. Before applying this system to a real power system on Jeju Island, system analysis should be performed through a real time test. In this paper, a model-sized superconducting VSC-HVDC system, which consists of a small model-sized VSC-HVDC connected to a 2 m YBCO HTS DC model cable, is implemented. The authors have performed the real-time simulation method that incorporates the model-sized superconducting VSC-HVDC system into the simulated Jeju power system using Real Time Digital Simulator (RTDS). The performance analysis of the superconducting VSC-HVDC systems has been verified by the proposed test platform and the results were discussed in detail.
Superconducting Cables for Power Transmission
International Journal of Engineering Applied Sciences and Technology
Large-capacity superconducting power cables are in the spotlight to replace existing underground transmission power cables for power transmission. The motive for the development of these superconducting power cables is to reduce the transmission losses during the transmission. By comparing the loss components in conventional as well as superconducting cables, it is concluded that high load connections are necessary to obtain energy saving by the use of HTS cables. High temperature semiconductor cables, work for the reduction of the increase of temperature in the conducting cables. High temperature semiconductor, with liquid nitrogen and gaseous helium system enables cable operation which is to reduce the fault in the system. In comparison with the conventional cables, the high temperature conducting cables have merits in small volume, high current density, environmental friendly, safer, no leakage of electromagnetic field outside of the cable, small impedance, low maintenance cost, low frequency of failure which brings a new power transmission system for the future smart grid. The use of ceramic-based HTS in the power transmission system achieves low loss transmission while eliminating resistive losses, supplant copper electrical conductors and more fundamental change to electric power transmission technologies.