Compact Systems for future HVDC applications Dr. Denis Imamovic
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1 Siemens Future HANNOVER MESSE 2014 Compact Systems for future HVDC applications Hannover Messe 2014
2 Compact Systems for HVDC Applications Main drivers today Main drivers today Space reduction Interconnection of Standardized HVDC Offshore Transmission Installations Energiewende Impact Increasing of transmission capacities Efficient transmission over long distances Increasing the grid stability with new generation structure Page 2
3 Compact Systems for HVDC Applications Solutions Pointto Point connections for strengthening of grid and transmission of RES Onshore applications in a Hybrid Transmission System (OHL, underground Transmission) Offshore / Onshore Multiterminal HVDC Systems Overlay (Backbone) Grid incl. Onshore and Offshore HVDC Systems Page 3
4 Towards a first HVDC system in Germany Korridor A = ~ 2 GW = ~ = ~ Korridor C = ~ Korridor A 2 x 1,95 GW 2 GW = ~ = ~ = ~ = ~ Korridor G = ~ 2 GW Page 4 Initial Illustration: Bryan Christie Design. Source:
5 Operational stresses in gas insulated systems Why is it NOT possible to directly use existing AC systems for DC voltage? Current I Gas Gas Stresses of insulators in operation Mechanical Stress Gas Grounded Encapsulation Gas Chemical Stress Thermal Stress Electric Stress Impact on DC insulating systems must withstand different electrical stress compared to AC systems Page 5
6 Physical Effects influencing electric stress Grounded Encapsulation T Diffusion Charge transport and accumulation Ionization Attachment Recombination N N N Field emission Drift due to electric field Page 6
7 Transition from AC to DC electric field AC 1 0 Positive space charge density in gas negative DC voltage 1 0 DC 1 0 Normalized Efield Negative space charge density in gas negative DC voltage 1 0 Page 7
8 HVDC basic investigations Exemplary test setups Artificial protrusions Dielectric limits Temperature gradient Longterm testing Surface effects Page 8
9 Technical challenges for DC insulators Development of insulator design allowing for control of physical effects, particularly charging effects Development of suitable insulating material for DC gas insulated systems Careful handling/drying of insulating parts and cleanliness during assembly Definition of equipmentspecific high voltage testing procedures Siemens Approach»» Application of capacitively graded insulator based on Resin Impregnated Paper (RIP) technology Page 9
10 Normalized electric field Innovative RIP insulator design for DCCS ±320 kv DC field distribution AC field distribution Radius Page 10
11 Potential distribution Simulation Effect of field grading AC DC With field grading High voltage conductor High voltage conductor Without field grading Page 11
12 Testing strategy There are NO international agreed standards for this kind of equipment. List of the possible dielectric tests: DC withstand test at higher level DC voltage with superimposed impulse voltage Polarity reversal Long(er) term test with specified voltage, current, temperature and time profile Conclusion Increasing of transmission capacities Efficient transmission over long distances Increasing the grid stability with new generation structure Page 12
13 Summary In addition to traditional Central Power Generation Large Scale Renewable Energy Sources (RES) have to be implemented into Transmission Systems New Transmission Solutions are needed Standardization of HVDC Grids has started in Europe Compact Gas Insulated Systems for HVDC Applications are feasible and ready for use Page 13
14 Contact: E T TS PLM 4 Freyeslebenstraße Erlangen denis.imamovic@siemens.com Page 14
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