Real-time simulation method and real-time simulation system

Abstract

The invention discloses a real-time simulation method and a real-time simulation system which are applicable to an alternating current traction transmission and applied to a real-time simulation model comprising a converter and a motor. Hybrid real-time simulation for a two-level voltage source converter and a three-phase alternating current asynchronous squirrel-cage motor topology circuit is realized based on an FPGA (field programmable gate array) and a processor, multiplication occupying more resources and slowly changing variables needing parameter setting are operated by the processor, rapidly changing system input/output variables related to door opening and closing signals are directly accumulated by the FPGA, an I/O (input/output) channel of the FPGA is used for acquiring the door opening and closing signals inputted by the system and the variables outputted by an output system, the resources occupied by the FPGA and time delay caused by operation of the processor are maximally decreased, the advantages of operation potential of the processor and high precision of the FPGA are made full use of, and the simulation scale of the alternating current transmission locomotive/vehicle traction system is effectively expanded without increasing the cost of a simulation hardware platform.

Description

technical field [0001] The invention relates to the technical field of AC traction drive, and more specifically, relates to a real-time simulation method and system. Background technique [0002] In the field of AC traction transmission, with the increase of intelligence and complexity of power electronics and drive system controllers, real-time simulation is a simulation study in which the dynamic process of the system simulation model is exactly the same as the time course of the dynamic process of the actual system. For example: as attached figure 1 The HiL (Hardware-in-the-Loop, hardware loop) real-time simulation of the shown controller, the developed controller is the device under test, which is connected to the HiL virtual device in the same connection mode as the actual device. HiL simulation runs in real time based on high-performance processor Pro or FPGA (Field-Programmable Gate Array, Field Programmable Gate Array), which can accurately simulate the electrical c...

AI Technical Summary

Problems solved by technology

Different from the offline simulation, the HiL simulator uses a fixed-step mathematical method to run in real time, which makes the HiL simulator and the controller run asynchronously, and the switching process within the simulation step is inevitable, resulting in the loss of the switching signal of the controller, which in turn leads to There is a calculation error in the state change of the transmission system

Therefore, the processor-based Pro and FPGA-based HiL simulations are used. Although the processor-based HiL simulation can accurately calculate the system state variables with fixed sampling intervals, due to the sequential instruction execution system software and the hardware consumption of the real-time processor , the resulting wait or HiL simulation delay caused by the simulation step limit is usually much longer than the real device, and the longest delay may be longer than a simulation time step

At present, the minimum time step is about 20μs. Therefore, compared with the actual converter and motor, the additional delay caused by the operation of the processor Pro will cause a considerable error in the Hil simulation, which cannot meet the requirements of real-time simulation; An FPGA-based HiL simulation, because of limited equipment resources, long compilation and integration time, more resources and consumption, can not meet the requirements of real-time simulation

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