A dynamic simulation method of urban rail traction power supply system based on quantized state time discretization
When establishing the dynamic mathematical model of traction power supply system for urban rail transit, it is necessary to solve the group of ordinary differential equations. However, because the traction power supply system of urban rail transit is a typical rigid system with complex topology and...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2022-09-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2022.05.022 |
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| Summary: | When establishing the dynamic mathematical model of traction power supply system for urban rail transit, it is necessary to solve the group of ordinary differential equations. However, because the traction power supply system of urban rail transit is a typical rigid system with complex topology and time-varying parameters, deviation between the simulated result and the reality exists in dynamic simulation when the traditional time-discrete algorithm is used to simulate the system. Therefore, a hybrid simulation method combining traditional time discretization and the quantized state system algorithm was proposed. Firstly, according to the varying rates of state variables, the system model was divided into two subsystems: large step solution and small step solution. The state variables of small step subsystem with fast-varying rates were quantized and discretized, and the pseudo-oscillation of simulation value was reduced by improving the quantized state system algorithm, while the traditional time discretization algorithm was used to improve the computational efficiency for the state variables of subsystems with relatively slow changes and large steps. Secondly, the dynamic mathematical models of multi-pulse uncontrolled rectifier unit and the power source train of the urban rail traction power supply system were established by using the ordinary differential equations, and the real-time power flow analysis of AC and DC side of the model was implemented by using the mixed simulation method of quantized state time discretization in MATLAB. Then an equivalent model was established in Simulink, and the waveforms obtained by using this algorithm were compared with the Simulink simulation waveforms to verify the accuracy of this method. Finally, the simulation time and step length of different methods were compared under the same simulation conditions. The results show that the quantized state time discretization hybrid solution method is feasible, accurate and efficient in the dynamic simulation system of urban rail traction power supply. |
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| ISSN: | 1000-128X |