Research On Z-Source Inverter Based On DSP

In recent years, the problem of traditional fossil energy shortage is day by day prominent, so while saving energy and reducing consumption, it is very important to develop green energy such as wind energy, solar energy and fuel cell, etc. Inverter plays a important role in new energy generating system. So far, widely used is a traditional voltage-source inverter, but application of this type of inverter in these occasions exists some limitations, due to it has such as the output voltage is lower than the input voltage, the same bridge arm devices do not allow be shoot-through and some other defects. This paper studied a new type of Z-source inverter system, it not only can make up the deficiencies of traditional inverter, but also has some new features which traditional inverter do not possess such as simple circuits, easy to realize step-up function, high reliability and so on.There are several kinds of topologies and control strategies of Z-source inverter. This paper chose two-level voltage type Z-source inverter as the study object, made theoretical analysis and simulation for shoot-through vectors segmented Space Vector Pulse Width Modulation (SVPWM) algorithm, builded physical model and did experiment.At the beginning, this paper analyses basic topology and operating principle of two-level voltage type Z-source inverter, abnormal working condition, the principles of all kinds of SVPWM control strategies and circuit parameters design.Then based on the theory analysis above-mentioned, this paper uses simulation software MATLAB/SIMULINK to simulate the two-level voltage type Z-source inverter with different SVPWM control strategies, the emulational waveforms validate the correctness of different strategies and the boost function of Z-source inverter.At last, under laboratory conditions, we construct hardware experimental platform of two-level voltage type Z-source inverter, it contains Z-source network, main circuit, isolating and driving circuit and snubber circuit. The programming adopts DSP of TMS320LF2407A and the control strategy is shoot-through vectors segmented SVPWM. The waveforms of experiments validate the validity of this control strategy and the boost function of Z-source inverter.