Modeling method of three-phase inverter real-time simulation model

Abstract

The invention discloses a modeling method for a three-phase inverter real-time simulation model, and the method comprises the steps: employing a quadratic function to fit an external characteristic curve of an IGBT switching operation process for the switching-on and switching-off processes of an IGBT; constructing a single IGBT switch model by a lookup table module of MATLAB / simulink, constructing a calculation model of a three-phase inverter IGBT switch bridge arm by utilizing a finite-state machine, and calculating an output phase voltage according to a control pulse; and importing the established model into an FPGA to construct a three-phase inverter real-time simulation model. The method has the advantages of being high in modeling precision, small in online calculation amount, clearin state conversion and control logic and the like, the built model can be directly transplanted to FPGA hardware, and the three-phase inverter real-time simulation system can be quickly built with low cost.

Description

technical field [0001] The invention relates to the technical field of modeling a real-time simulation model of a three-phase inverter, in particular to a modeling method for a real-time simulation model of a three-phase inverter. Background technique [0002] Inverter is a device that converts DC power into AC power by turning on and off power electronic devices, and is widely used in photovoltaic power generation, AC drives and other fields. Inverters are divided into two-level, three-level and multi-level according to the number of levels of the output voltage waveform; according to the number of phases of the output voltage, they are divided into single-phase inverters, three-phase inverters and multi-phase inverters device. The two-level three-phase inverter includes three bridge arms, each bridge arm includes an upper IGBT switch and a lower IGBT switch, and each IGBT switch is connected in reverse parallel with a freewheeling diode. In the development process of the...

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Problems solved by technology

[0004] One is to use the built-in modules in the Matlab / simulink toolbox SimPowerSystem to build the inverter simulation model, which has the disadvantages of complex calculation and slow calculation speed, and is often used for offline simulation, which is difficult to meet the requirements of real-time simulation

[0005] The second is to establish the IGBT switch model and analyze the working characteristics of the inverter. Based on the IGBT switch model, the Matlab / Simulink module is used to build the inverter simulation according to the model calculation method, which will lead to a large amount of online calculation of the model and slow simulation speed. The established model is difficult to be directly transplanted to the hardware platform

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