Presented By:

Mr.MANISH .U.CHAVAN

Seat No. T120212508

AISSMS’S COLLEGE OF ENGINEERING PUNE

Department of Electrical Engineering

Guided By:

Prof.Mrs.S.Y.CHAVAN

Introduction

The Chandrapur-Padghe 500KV 1500 MW HVDC

bipolar transmission link of 752km length,

interconnects the eastern & western part of

Maharashtra state. this BIPOLAR link evacuates

power from Chandrapur super thermal power station

to western part of state. the system consist of 2 pole

of 750MW each, connected in bipolar configuration.

The project is in commercial operation since 1999

till date in parallel with MSETCL existing 400KV

transmission system.

Rated Power 1500 MW

DC Voltage � 500 kV

AC System Voltage Chandrapur 400 kV

Dadri 400 kV Padghe 400 kV

Overload Capacity low ambient 1650 MW

2h 1650 MW

5s 2000 MW

Maximum Continuous Current 1786 A

Thyristor Valves

Thyristor Size 45 sq. cm.

Valve Type 3 quadruple valves per converter

Cooling Water

Converter Transformers

Number in each terminal 6 nos. single-phase 3-winding (+1 spare)

Rated Power 298.6 MVA

Smoothing Reactor 360 mH oil insulated and insulated per pole

AC Filters 4 nos. 200 MVAR in each station

Single line diagram

Comparison of AC&DC Transmission

oThe cost of a transmission line includes the investment & operational costs.

o Investment include costs of right of way(RoW),towers ,conductor, insulator and terminal equipments.

oHighly reliable.

oFull control over power transmission.

oInitial cost is high but overall cost is low than AC transmission system.

oLess corona effect.

oNo skin effect.

oCan interconnect diff power system.

oFive times more energy transmits than AC system.

oSystem is much stable.

oHigh transmission effeciency

Mode of operation : Bipolar

oIt has two conductors, positive & negative.

obundled conductor.

oEach set has two set of converter of identical rating in series.

oThe junction between two set is grounded at both end.

oBoth pole operate at equal current & hence there is zero ground current flowing.

Financing WORLD BANK

POWER FINANCE CORPORATION

ABB

BHEL

GRANT FROM SWEDISH AID AGENCY SIDA

SOFT LOAN FROM SWEDISH AGENCY BITS

FINANCE FROM INDUSTRIAL BANK ,GUARANTEED BY GERMAN CREDIT INSURANCE,HERMES

Main circuit equipments:Converters & Inverterso They perform AC/DC and DC/AC conversion.

oThey consist of valve bridge and transformer.

oValve bridge consist of high voltage valve connected in a 6 pulse or 12 pulse arrangement.

oTransformer are ungrounded such that dc system will be able to establish its own reference to ground .

Smoothing reactorsoThey decrease harmonics in voltage & current in DC line.oThey prevent commutation failure in inverter.oPrevent current from being disconnected for light load.

FiltersoConverters generate harmonics in voltage & current.

oThese cause overheating of capacitor.

oFilters are use to mitigate these harmonics.

oAC & DC FILTERS

Converter transformeroThey are design to withstand DC voltage stress .&increase eddy current losses due to harmonic current.

oFault arise is by DC magnetization of core due to unsymmetrical firing of valve.

Reactive power sourceoConverter station require reactive power that is dependent on active power loading (anout50-60%of active power).oDue to the fact that current drawn by LCC can only lag supply voltage.

DC switchgearoIt is modified AC equipment used to interrupt small DC current.oUsed for protection and measurement.oIt include DC current& voltage transducers.

Thyrister valvesoThey make conversion from AC into DC,hencecentral component of any converter station.

FACTS

AUXILIARY POWER SYSTEM

oTo achieve desired reliability and availability of an HVDC link.

oIt consist of fully control & protection system with one active system and one hot standby system.

SCADA

oSupervisory control and data acquisition system.

oSimple fast efficient data retrieval.

oCan monitor 600 signal(analog & digital).

FUTURE OF HVDC

Conclusion Less power losses

No skin effect

Less corona effect

Highly stable system

Can connect two diff power systems

Less ferranti effect

Compensation is not required

Long & underwater power transmission

REFERENCE

Report of 15th national power system conference (NPSC) IIT bombay,Dec 2008

The Chandrapur –Padghe HVDC Bipolar project report of ABB SWEDEN

An over view to HVDC line India by Prof. Kusum Tharani

BOOK• HVDC power transmission system by K.R.Padiyar

WEBSITE• http://new.abb.com/systems/hvdc/references/chandrapur---padghe

• http://www.bhel.com/product_services/tranmission/hvdc/win3.htm

THANK YOU