| 引用本文: | 张华强,齐彩娟,姚 统.直通物理分离型Z源逆变器并网[J].电力自动化设备,2014,34(7): |
| ZHANG Huaqiang,QI Caijuan,YAO Tong.Grid-connection of isolated shoot-through Z-source inverter[J].Electric Power Automation Equipment,2014,34(7): |
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| 摘要: |
| 提出一种直通物理分离型Z源逆变器，通过在传统阻抗网络拓扑结构上引入1个二极管、1个电容和1个全控型器件，有效降低了启动冲击电流和Ｚ源网络电容电压应力，实现了升压因子和调制因子的解耦控制，提高了Z源网络的升压能力。基于直通物理分离型Z源逆变器数学模型，研究了以并网电流控制为内环、直流母线电压控制为外环的双闭环PI控制方案。在理论分析的基础上，对直通物理分离型Z源逆变器并网进行仿真及实验研究，结果表明：系统启动电流冲击小，并网功率因数高，鲁棒性强，动态性能稳定，验证了拓扑结构的正确性和控制策略的优越性。 |
| 关键词: Z源逆变器 并网 解耦控制 电压控制 直通零矢量 仿真 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（51377168）；科技部创新基金资助项目 |
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| Grid-connection of isolated shoot-through Z-source inverter |
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ZHANG Huaqiang, QI Caijuan, YAO Tong
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Department of Electrical Engineering，Harbin Institute of Technology，Harbin 150001，China
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| 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. |
| Key words: Z-source inverter grid-connection decoupling control voltage control shoot-through zero vector computer simulation |
