overlay of mtdc grid to relieve power congestion of …overlay of mtdc grid to relieve power...

Overlay of MTDC grid to Relieve Power Congestion ofPower System

Lokesh Dewanganand

Prof. Himanshu Bahirat

Indian Institute of Technology Bombay

September 6, 2017

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Contents

1 Introduction of MTDC system

2 Renewable growth in India

3 Power congestion in transmission line

4 HVDC grid overlay

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Introduction of MTDC system

(a) CGRE banchmark model

1 Advantages of VSC over LCC based converter station

Power reversal simply current reversal

Independent active reactive power control

No reactive power requirement

Low order harmonics

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Motivation

(b) European supergrid

Remote location of renewable energy sources

Voltage profile improvement and congestion relieving

Reliable power supply and segmented large grid

Stability improvement

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Vision of MTDC in Indian grid

Figure: Location of renewable sources in India

Away from load center load.

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Wind Growth in India

Figure: Wind installation scenario

Table: Wind Installed Capacity

States Wind Installed

Andhra Pradesh 1393.5Gujarat 4030.65

Karnataka 2878.3Kerala 43.4

Madhya Pradesh 2171.9Maharastra 4670.65Rajasthan 3994.9Tamil Nadu 7652.15Telangana 77.5

1 Wind injection buses

Distance from wind farmVoltage ratingAvailability of extra additioncapacity

1 MTDC terminal buses

Congested linesNeed of voltage and powercontrolFrequency support andasynchronous connection

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Without wind integration

Figure: SLD of grid without wind Integration

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Without wind integration

Figure: Without wind integration

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With wind integration

Figure: SLD of grid with wind integration

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With wind integration

(a) With 1.5 GW wind integration (b) With 3.0 GW wind integration

(c) With 5.2 GW wind integration

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Overlay of MTDC grid

Figure: SLD of grid with wind and MTDC grid

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Overlay of MTDC grid

(a) First HVDC line (b) Second HVDC line

(c) Third and fourth HVDC lines (d) Fifth and sixth HVDC lines

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Conclusion and future scope

1 Conclusion

Wind integration will congest the existing AC line

Wind injection and MTDC terminals are identified

MTDC system has eliminated the power congestion

2 Future scope

Stability analysis of combined AC/DC grid

Conversion of one AC line to DC line on double circuit line.

Voltage profile and cost benefit analysis.

LCC interaction with VSC station.

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