3-Phase Traction Drives using RT-Lab Bharat Heavy Electricals Limited, Bhopal, India About BHEL • Bharat Heavy Electricals Limited (BHEL) is one of the leading organizations in transportation field with latest technology, modern facilities, requisite expertise and experience. Commencing from the year 1962, BHEL is engaged in system design, equipment design, manufacture, supply, erection & commissioning of variety of traction equipment for electric & diesel electric traction and AC-DC main line locomotives. Over 70% of the rolling stock fleet of Indian Railways is equipped with BHEL manufactured traction equipment. With expertise and modern facilities, BHEL Bhopal has entered the filed of 3-phase state-of-art technology for 3-phase drive traction applications. About BHEL • BHEL Bhopal has been supplying conventional DC drive electrics for last four decades for 25 KV 50 Hz AC Electric Multiple Units (EMUs) & Locomotives; 1500 V DC EMUs & Locomotives, Diesel EMUs & Locomotives, 750 V DC Calcutta Metro, etc. Due to the problems and disadvantages of conventional DC drive systems, Indian Railways have decided to introduce state-of-art microprocessor controlled 3-phase drive technology in traction applications Why we want a 3 Phase Drive ? • Energy efficiency • Provides step-less control increases passenger comfort • Better adhesion between wheel & rail due to smooth control • Adaptability to digital control provides flexible operation • Wide range of diagnostic features • Compact size of equipment • Inherent regenerative braking capability • Unity power factor in 25 KV AC traction operation • Robustness and reliability with squirrel cage induction motor as traction motor, etc. Phases of the project 1. Development of application software for control system strategy for IGBT based 3-Phase drive AC EMU and DEMU . 2.Development of simulator hardware and real time software from simulator manufacturer M/S Opal-RT. 3. Integration of application software with real time software to form complete RTDPES simulator. 4. Commissioning and testing of RTDPES Simulator at CET Laboratory, BHEL Bhopal Reasons why BHEL chose RT-Lab.. 1/4 • For studying the behaviour of actual system of IGBT based 3-Phase AC EMU and DEMU we require to perform simulation with Time Step typically in the range of 50 microseconds. This ensures that all the results are close to actual system performance. Due to complex nature of the application program it is not possible to perform Real time simulation using single core processors with above mentioned time step. M/s Opal-RT are experts in this field. Reasons why BHEL chose RT-Lab.. 2/4 • M/s.Opal-RT has also developed their own toolboxes which help the user in simulating complex PWM IGBT/GTO based Converter / Inverter topologies. They have also developed technology for providing optimum performance from the dual/quad core processor. Reasons why BHEL chose RT-Lab.. 3/4 • M/s OPAL RT has developed TestDrive GUI software which enables us to prepare our panels using LabView and then integrate this with models developed in Simulink . This enables us to perform better analysis of the system being monitored. Reasons why BHEL chose RT-Lab.. 4/4 • M/s OPAL-RT has developed systems so that multiple HIL boxes can be integrated as one system. The means of communication between these HIL boxes is through FireWire Cable which provides fast data transfer then conventional Ethernet cables.. Depending upon the capacity of HUB and the network topology various other devices can be connected to the network depending upon user requirement. Benefits of using OPAL-RT system …1 / 3 • System Analysis and Studying the behaviour of control system on IGBT based 3-Phase drive AC EMU and DEMU : We have developed Matlab-Simulink model of control system for Front End Converter, IGBT based inverter, 3-Phase Induction motor for AC EMU and similar models for diesel engine and traction alternator for DEMU. By testing these models on RT lab system we can evaluate performance of AC EMU and DEMU control system. Benefits of using OPAL-RT system …2/3 • Train Control and Monitoring System : - We are developing Train Control and Monitoring system for IGBT based AC EMU. The control system is based on MATLAB-SIMULINK, Real Time Workshop, State Flow Coder. This system will be tested on Real Time Digital Simulator before actual implementation. This will enable us to reduce time required for fine tuning the application software. • Equipment Rating : By performing off-line simulation of AC EMU models on RT LAB system we can find out rating of various equipment like Front End Converter, Induction Motor, Inverter etc. Benefits of using OPAL-RT system …3/3 • Steady State and Transient analysis : We can also perform steady state and transient performance evaluation of the complete system of 3-phase AC EMU and DEMU which is required for preparing offer against tender by customer. • Train performance Calculation : We can perform Train performance calculations for average section and for a route profile for 3-phase AC EMU and DEMU which is required for preparing offer against tender by customer.