Increased renewable energy integration and international power trades have led to the construction and development of new HVDC transmission systems.HVDC cables,in particular,play an important role in undersea power tr...Increased renewable energy integration and international power trades have led to the construction and development of new HVDC transmission systems.HVDC cables,in particular,play an important role in undersea power transmission and offshore renewable energy integration having lower losses and higher reliability.In this paper,the current commercial feasibility of HVDC cables and the development of different types of HVDC cables and accessories are reviewed.The non-uniform electric field distribution caused by the applied voltage,temperature dependent conductivity,and space charge accumulation is briefly discussed.Current research in HVDC cable for higher operation voltage level and larger power capacity is also reviewed with specific focus on the methodologies of space charge suppression for XLPE extruded cables.展开更多
This paper is devoted to solving the transient electric field and transient charge density on the dielectric interface under the electroquasistatic(EQS)field conditions with high accuracy.The proposed method is suitab...This paper is devoted to solving the transient electric field and transient charge density on the dielectric interface under the electroquasistatic(EQS)field conditions with high accuracy.The proposed method is suitable for both 2-D and 3-D applications.Firstly,the governing equations represented by scalar electric potential are discretized by the nodal finite element method(FEM)in space and the finite difference method in time.Secondly,the transient constrained electric field equation on the boundary(TCEFEB)is derived to calculate the normal component of the transient electric field intensities on the Dirichlet boundary and dielectric interface as well as the transient charge density on the dielectric interface.Finally,a 2-D numerical example is employed to demonstrate the validity of the proposed method.Furthermore,the comparisons of the numerical accuracy of the proposed method in this paper with the existing FEMs for electric field intensity and charge density on the dielectric interface are conducted.The results show that the numerical accuracy of the proposed method for calculating the normal component of transient electric field intensities on the Dirichlet boundary and dielectric interface as well as the transient charge density on the dielectric interface is close to that of nodal electric potential and an order of magnitude higher than those of existing FEMs.展开更多
500 k V输电线路架空地线通常采用一根GJ钢绞地线,一根OPGW光纤复合地线架设方式。研究表明,GJ钢绞地线采用分段绝缘、中点接地方式,OPGW光纤复合地线采用分段绝缘、一点接地方式,既可以限制地线上的感应电压幅值,减小地线感应环流及损...500 k V输电线路架空地线通常采用一根GJ钢绞地线,一根OPGW光纤复合地线架设方式。研究表明,GJ钢绞地线采用分段绝缘、中点接地方式,OPGW光纤复合地线采用分段绝缘、一点接地方式,既可以限制地线上的感应电压幅值,减小地线感应环流及损耗,具有良好的雷电保护性能。该次研究以浙江金华一条实际运行中500 k V输电线路为对象,结合中国110~750 k V架空输电线路设计规范（GB 50545—2010）、电力行业标准光纤复合架空地线（DL/T 832—2003）以及制定中的110~500 k V交流输电线路架空地线接地技术的新标准,采取EMTP-ATP软件仿真计算的方法,对该500 k V架空地线目前实际采取的以及可能采取的多种接地方式进行了感应电压、感应环流、能量损耗的综合研究、比较。为超高压输电线路架空地线接地方式的优化提供了理论依据。展开更多
基金supported by the State Grid Corporation of China:Research on Key Technologies of Insulation Material and Accessories for 320 kV HVDC XLPE Cable System(SGRIZLJS(2014)888).
文摘Increased renewable energy integration and international power trades have led to the construction and development of new HVDC transmission systems.HVDC cables,in particular,play an important role in undersea power transmission and offshore renewable energy integration having lower losses and higher reliability.In this paper,the current commercial feasibility of HVDC cables and the development of different types of HVDC cables and accessories are reviewed.The non-uniform electric field distribution caused by the applied voltage,temperature dependent conductivity,and space charge accumulation is briefly discussed.Current research in HVDC cable for higher operation voltage level and larger power capacity is also reviewed with specific focus on the methodologies of space charge suppression for XLPE extruded cables.
基金This work was supported by the National Natural Science Foundation of China-State Grid Corporation Joint Fund for Smart Grid(No.U1766219).
文摘This paper is devoted to solving the transient electric field and transient charge density on the dielectric interface under the electroquasistatic(EQS)field conditions with high accuracy.The proposed method is suitable for both 2-D and 3-D applications.Firstly,the governing equations represented by scalar electric potential are discretized by the nodal finite element method(FEM)in space and the finite difference method in time.Secondly,the transient constrained electric field equation on the boundary(TCEFEB)is derived to calculate the normal component of the transient electric field intensities on the Dirichlet boundary and dielectric interface as well as the transient charge density on the dielectric interface.Finally,a 2-D numerical example is employed to demonstrate the validity of the proposed method.Furthermore,the comparisons of the numerical accuracy of the proposed method in this paper with the existing FEMs for electric field intensity and charge density on the dielectric interface are conducted.The results show that the numerical accuracy of the proposed method for calculating the normal component of transient electric field intensities on the Dirichlet boundary and dielectric interface as well as the transient charge density on the dielectric interface is close to that of nodal electric potential and an order of magnitude higher than those of existing FEMs.
文摘500 k V输电线路架空地线通常采用一根GJ钢绞地线,一根OPGW光纤复合地线架设方式。研究表明,GJ钢绞地线采用分段绝缘、中点接地方式,OPGW光纤复合地线采用分段绝缘、一点接地方式,既可以限制地线上的感应电压幅值,减小地线感应环流及损耗,具有良好的雷电保护性能。该次研究以浙江金华一条实际运行中500 k V输电线路为对象,结合中国110~750 k V架空输电线路设计规范（GB 50545—2010）、电力行业标准光纤复合架空地线（DL/T 832—2003）以及制定中的110~500 k V交流输电线路架空地线接地技术的新标准,采取EMTP-ATP软件仿真计算的方法,对该500 k V架空地线目前实际采取的以及可能采取的多种接地方式进行了感应电压、感应环流、能量损耗的综合研究、比较。为超高压输电线路架空地线接地方式的优化提供了理论依据。
