Abstract
An IST-ZSI(Isolated Shoot-Through Z-Source Inverter) topological structure is proposed, which adds a diode, a capacitor and an entirely-controllable device to the traditional impedance network to effectively reduce the startup inrush current and the voltage stress of Z-source network capacitor, realize the decoupling control between Boost factor and modulation index, and improve the Boost capability of Z-source network. A double close-loop PI control scheme, including the grid-connecting current control inner-loop and the DC-link voltage control outer-loop, is studied based on the mathematical model of IST-ZSI. The IST-ZSI grid-connection is studied based on the theoretical analysis via simulation and experiment, and the simulative and experimental results show that, the system with IST-ZSI has lower startup inrush current, higher grid-connection power factor, stronger robustness and better dynamic performance, verifying the correctness of the proposed topology and the superiority of its control strategy.
| Original language | English |
|---|---|
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Dianli Zidonghua Shebei/Electric Power Automation Equipment |
| Volume | 34 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2014 |
Keywords
- Computer simulation
- Decoupling control
- Grid-connection
- Shoot-through zero vector
- Voltage control
- Z-source inverter
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