Inhaltszusammenfassung

The increasing demand of electrical energy requires the integration of renewable energy by use of multi-terminal HVDC interconnectors. Within the context of ongoing and planned HVDC links, the application of HVDC system voltage levels of up to U0 = ±525 kV is intended. The associated technical challenges require the development and qualification of advanced HVDC systems as well as the combination of different HVDC technology solutions, such as cable systems and gas-insulated systems (DC GIS),...The increasing demand of electrical energy requires the integration of renewable energy by use of multi-terminal HVDC interconnectors. Within the context of ongoing and planned HVDC links, the application of HVDC system voltage levels of up to U0 = ±525 kV is intended. The associated technical challenges require the development and qualification of advanced HVDC systems as well as the combination of different HVDC technology solutions, such as cable systems and gas-insulated systems (DC GIS), especially in terms of space-saving installations. The combination of HVDC system components requires the consideration of specific design rules and individual test philosophies. The evaluation of the technical challenges is part of an ongoing CIGRE joint working group B1/B3/D1.79 "Recommendations for dielectric testing of HVDC gas insulated system cable sealing ends". With regard to the necessity of the combination of advanced transmission components, a type test procedure on a U0 = ±525 kV HVDC cable system has been conducted. The test setup contains HVDC cables with an advanced inorganic filled-type cross-linked polyethylene (XLPE) insulation compound and a copper cable conductor cross-section of 2500 mm 2. The XLPE insulation compound consists of an inorganic filler added to the XLPE insulation compound for the optimization of the DC material properties, such as DC resistivity and space charge characteristics. The HVDC cables have been produced by two different cable manufacturers. The HVDC cables are connected by two types of HVDC cable joints (straight through joint and sectionalizing joint). In addition, two GIS dry type cable terminations are connected to DC GIS components according to interface configuration given in standard IEC 62271-209 for cable connection assemblies. The type test procedure has been conducted according to international standards and recommendations at an independent and accredited test institute. The test profiles comprise of mechanical pre-conditioning of the cables, heating cycle voltage tests, lightning and switching superimposed voltage tests, and a subsequent DC voltage test. The type test procedure has been conducted according to test profiles for voltage source converters (VSC). Furthermore, for the evaluation of the system integrity, additional polarity reversal operations with test voltages of up to UTP1 ±928 kV (representing a nominal voltage level of U0 = ±640 kV) has been applied according to normative defined test profiles for line commutated converter (LCC) operations. The paper gives an overview of a state of the art combined HVDC cable system type test sequence with integrated DC GIS components for a nominal voltage level of U0 = ±525 kV. The overall test setup, cable system components, and DC GIS components are addressed within the paper. Details of the applied test profiles under consideration of thermal and electrical system boundary conditions are described. Test results are evaluated and further recommendations for the combination of HVDC cable systems and DC GIS components are given. The paper is concluded by lessons learned of the successful cooperation between cable system manufacturers and DC GIS manufacturer. In summary, the intended paper describes a comprehensive overview of one of the latest technical challenges towards the integration of renewable energy sources.» weiterlesen» einklappen

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DDC Sachgruppe:
Ingenieurwissenschaften