INNOVATIVE SOLUTION: HESOP. Mr. Swarup Chakraborty

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1 INNOVATIVE SOLUTION: HESOP Mr. Swarup Chakraborty

2 What is HESOP? Harmonic and Energy Saving Optimiser An advanced substation for networks from 600V DC to 1500V DC and from 900kW to 4MW which offers both: Best energy efficiency with 99% of braking energy recovery & high energy quality (provides dynamic voltage and current regulation to optimize power use in traction mode) Reduced infrastructure

3 How is Energy lost? During braking, electric motors in a train behave like generators, transforming movement into electricity, or 'braking energy Some of this energy is used by the train itself and by trains running nearby, but the rest is lost. Brake resistors Braking energy dissipated into the on board resistors

4 Difference between Classic and HESOP Classic substation Architecture HESOP substation Transformer & rectifier No energy recovery No traction optimization 99% braking energy recovery Traction optimization

5 HESOP A Better Choice Other reversible substation HESOP substation Partial recovery of braking energy Potential traction optimization with Thyristor rectifier Simplified architecture 99% braking energy recovery Traction optimization

6 Benefits of HESOP on Infrastructure Thanks to the voltage regulation in traction mode, HESOP allows to reduce the number of substations by 20% on average leading to: Less real estate and network deviations Less civil work Less power supply equipment Reduced quantity of MV Cells, transformers, rectifier, DC switchboards, Auxiliary distribution & cables Reduced or cancelled feeder cables (for tramway application) Reduced catenary section (for tramway application) A traction simulation is required to define the exact level of optimization

7 Benefits of HESOP on tunnel & in station ventilation Thanks to full recovery of available braking energy, HESOP allows high line receptivity and thereby limits train heat dissipations. This leads to: Tunnel & in station ventilation / air conditioning reduction On board brake resistor removal Train s weight reduction (metro: 300 kg/car; tramway: 115 kg/car) => traction & energy consumption reduced Train s available technical space increased: possibility to add more auxiliary equipment on board such as air conditioning Train s price reduction

8 Benefits of HESOP on Energy Consumption HESOP recovers over 99% of the available braking energy. The energy recovered can be re used through the station equipment (auxiliaries, escalators, lighting, ventilation, etc.) or re injected into the electricity network. The reduction of heat dissipation allows to reduce tunnel & station ventilation or air conditioning The reduced power installed leads to a lower power subscription HESOP

9 Benefits of HESOP on Operation Availability: automatic smoothing of peak loads and traction voltage adjustment when another substation is in fault mode => Substations will remain in operation even in case of unexpected peak load High Energy quality: Filtering to lower harmonics levels (THDI < 5%) and adjustable power factor (up to cos phi = 1) Line voltage stabilization:even in case of fluctuation on AC side Possible network evolutions without any hardware change: line voltage modification, increase of traffic Facilitated maintenance: Remote monitoring functions Catenary de icing function Braking resistor removal Less use of mechanical brakes

10 Benefits of HESOP on the Environment HESOP reduces energy consumption and the heat released in the atmosphere i.e. CO 2 emissions HESOP uses recyclable materials and is compliant with Eco Design standards (REACH, RoHS). HESOP 1500V development has been selected by European LIFE+ program to promote environmentally friendly actions

11 Competition Comparison with other solutions FUNCTIONS HESOP TM Controlled Rectifier Diode Rectifier Voltage regulation Harmonic filtering Smoothing power peaks? AC voltage changes compensation? Nominal voltage online modification? Braking energy recovery GENERAL HESOP TM Controlled Rectifier Diode Rectifier Traction power system optimization (Reduced number of substations, remove feeder cables, ) Energy bill (peak power + consumption)

12 References Ongoing contracts LONDON METRO 1 HESOP substation 600V 1MW in recovery mode only Objective: reduce heat dissipation in tunnel 1 HESOP substation 1,500V 4MW MILAN METRO Objective: reduce CO2 emissions by 15% RIYADH METRO 32 HESOP bi group substations = 64 Hesop converters 750V 1,2MW Objective: remove braking resistors and optimize power supply MILAN TRAMWAY 8 HESOP bi group substations = 16 Hesop Converters 600V 1MW Objective: reduce substations from 10 to 8 & feeder cable section And many offers on going: for Stand Alone /Turnkey tenders or within Alstom AXONIS Solution

13 Thank you