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With the rapid development of traction motor control technology and manufacturing techniques, motors have been widely used in urban rail transit, light rail, subway, and other fields. Especially with the rapid advancement of electrification in rail transportation, the testing of traction motor controllers has gained increasing attention from researchers. However, traditional physical testing of traction motors is expensive, carries high risks, and has long testing cycles.Therefore, many researchers have gradually started using real-time simulators for hardware-in-the-loop (HIL) testing of traction motor controllers. Compared to traditional physical testing of traction motors, real-time simulation technology not only allows for fast, efficient, safe, and cost-effective testing of traction motor controllers but also enables quick switching tests for different types and parameters of traction motors.
Professor Liu Zhigang's research team at Southwest Jiaotong University has proposed a method to improve the operational performance of the vehicle-grid system based on sliding mode control. This method demonstrates better control performance compared to traditional PI control. It exhibits advantages such as lower total harmonic distortion of traction line-side current under various operating conditions, reduced voltage fluctuations during braking, stronger anti-interference capability, and effective suppression of low-frequency oscillations during operation.The research conducted experiments using Shanghai StarSim power electronics real-time simulator of ModelingTech. The experimental results validate the correctness of the proposed control strategy for the traction grid-side inverter of the train unit. The findings were summarized and published in "IEEE ACCESS" under the title: Y. Zhang, S. Wu, Z. Liu, Q. Yan, and T. Chen, "An Approach to Improve System Performance in the Vehicle-Grid System Using Sliding Mode Control Under Multiple Operation Conditions," in IEEE Access, vol. 8, pp. 11084-11095, 2020.
Traction motor simulation testing not only involves high-speed switching devices but also requires precise output of the motor's encoder signals, which presents certain challenges for real-time simulation. The StarSim real-time simulator provided by ModelingTech is based on detailed models of power electronic devices and utilizes the latest FPGA technology. It enables real-time simulation of power electronic systems with a 1-microsecond time step, arbitrary topologies, multiple types of motors, and various operating conditions. It has been widely used in real-time simulations for new topology structures, verification of new control strategies, motor drives, and more.Users only need to load the motor simulation topology into the real-time simulator using the StarSim HIL host software and correctly connect the interface of the real-time simulator with the motor controller interface to achieve motor controller testing.
The motor model runs on the FPGA with a microsecond-level time step, allowing for precise simulation of motor operation characteristics.
Support DFIG, PMSM, six-phase PMSM and other types of motor models, and support an FPGA simulation of two motors, to meet the needs of multi-motor operation in the field of wind power applications.
It can simultaneously support two three-phase permanent magnet synchronous motors or two three-phase squirrel cage induction motors.
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