1. Transmission and Sub-Transmission Network India – Present and Future Rajesh Suri GE (T&D) India Ltd
8 November 2018

2. Planned Growth of Transmission Network in India
Ref. National Electricity Plan – Transmission by Central Electricity Authority
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8 November 2018

3. Evolution of the Grid – HVDC Contribution
Chandrapur
2 x 500 MW
1997
Visakhapatnam 500 MW
1999
Sasaram 500 MW
2002
Vindhyachal 500 MW
1989
Vindhyachal
500MW, 70kV B-to-B
Asynchronous link
W-N regions
Chandrapur
2 x 500MW, 200kV B-to-B
W-S regions
Visakhapatnam
1 x 500MW, 200kV B-to-B
E-S regions
Sasaram
E-N regions
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8 November 2018

4. Evolution of the Grid - India
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8 November 2018

5. Issues in Transmission Network
Utilization of existing resources and systems to the maximum extent
Transmission of bulk power over long distances efficiently
Severe Right of Way constraints
Uncertainty in Generation
Control of flow of power
Stability
The world is moving towards a global energy market – create need for national and international grid interconnections
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8 November 2018

6. Transmission Requirements
Meet system requirements – active and reactive power during variations in load demand and contingencies
Option of up-gradation / allow implementation in stages
Transfer of allocated power with margins / long-term contractual requirement
High Availability & Reliability
Low cost to consumers

7. Uneven Distribution of Energy Sources
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8 November 2018

8. Uneven Distribution of Energy Sources
Energy Resources confined mostly to Eastern Region and NE Region and Load Centers in Western, Southern and Northern Regions, hence bulk power transmission over long distance.
Future Solution:
Long Distance HVDC Projects, like Champa-Kurukshetra
Parallel HVDCs and FACTS devices to enhance existing network capability and resolve stability issues.
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8 November 2018

9. Right of Way Issue
The most challenging issue with the transmission sector is the Right of Way (ROW), high intensity transmission corridor (MW per meter ROW) is needed.
Visual impact of sub-transmission network on big cities with densely populated urban areas, demands underground cable power transmission.
Future Solution:
More high Voltage Multi-Circuit AC transmission corridors (1200kV/765kV) and Long distance HVDC transmission, to reduce the ROW requirement.
TCSC installation, to increases the power transfer capability as well as to improve system stability with existing network.
Compact Sub-stations – GIS.
VSC HVDCs for cities infeed, hence no ROW required and no visual impact.
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8 November 2018

10. Right of Way Issue 1850MVA 5550MW AC DC 1850MW DC
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8 November 2018

11. Power Regulation and Network Stability
Due to increase in the complexity in power transmission network, stability and power regulation is issues difficult to handle.
Future Solution:
More long Distance and B-B HVDC Inter- Regional Links.
FACTS devices and Phase Regulating Transformers to utilize the existing assets to the fullest extent as well as regulate the power in a particular direction
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8 November 2018

12. Power Regulation and Network Stability
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8 November 2018

13. Protect, Control, Monitor
INDIA – unifieD real-time dynamic state MEASUREMENTS (URTDSM) – Grid SECURITY
World’s largest grid Wide Area Monitoring System.
Solution provided gives a view of the real-time state of the network power flow, allowing  to take preventive actions and ensuring grid stability
1,300 MiCOM P847 Phasor Measurement Units (PMU), to collect over 18,000 real-time synchronised measurements from 351 substations across the country.
e-terraphasorpoint in 34 control centres at existing National, Regional and State Load Dispatch sites
Protect, Control, Monitor
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8 November 2018

14. Renewable Energy Growth
Ref. National Electricity Plan – Transmission by Central Electricity Authority
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8 November 2018

15. Renewable Energy Growth
Increasing penetration of renewable energy, wind, solar etc. is challenge for transmission and sub- transmission network.
Integration of these intermittent energy sources in Grid is a challenge.
Planning of power flow network, because of intermittent nature of energy.
Future Solution:
VSC HVDCs to integrate these sources into Grid, to comply with grid codes, hence better power quality and reliability.
Integrated system planning is required and not the earlier generation evacuation system planning
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8 November 2018

16. Integrated Power System Network - Present
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8 November 2018

17. Distributed Power System Network - Future
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8 November 2018