| 带有虚拟阻抗的逆变器并联改进型下垂控制 |
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| 引用本文： | 赵晋斌,刘海先,屈克庆,李芬. 带有虚拟阻抗的逆变器并联改进型下垂控制[J]. 上海电力学院学报, 2015, 31(2): 101-105 |
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| 作者姓名： | 赵晋斌 刘海先 屈克庆 李芬 |
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| 作者单位： | 上海电力学院电气工程学院,上海电力学院电气工程学院,上海电力学院电气工程学院,上海电力学院电气工程学院 |
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| 基金项目： | 上海市科学技术委员会浦江计划(12PJ1403900);上海市教育委员会科技创新重点项目(13ZZ132) |
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| 摘 要： | 给出了一种单相电压源逆变器(VSI)并联系统的控制策略.该控制策略应用dq变换得到有功电流和无功电流来替代传统下垂控制中的有功功率和无功功率,降低了负载电压波动对下垂控制方程的影响.为了进一步提高逆变器的输出特性及更大程度上消除环流,在下垂控制的基础上加入了虚拟阻抗控制.相比其他控制方法,该控制策略不但可以使逆变器工作过程实现输出有功功率的均分,而且具有良好的动态特性.同时,无互联线控制方式使得该方法便于逆变器的热插拔和冗余设计.仿真结果证明了该控制方法的可行性和优良性能.
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| 关 键 词： | 并联系统 逆变器 虚拟阻抗 均流 |
| 收稿时间： | 2014-09-24 |
An Improved Droop Control Strategy Based on Virtual Impedance in Inverter Parallel System |
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| ZHAO Jinbin,LIU Haixian,QU Keqing and LI Fen. An Improved Droop Control Strategy Based on Virtual Impedance in Inverter Parallel System[J]. Journal of Shanghai University of Electric Power, 2015, 31(2): 101-105 |
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| Authors: | ZHAO Jinbin LIU Haixian QU Keqing LI Fen |
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| Affiliation: | School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China,School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China,School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China and School of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China |
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| Abstract: | A control strategy for single-phase parallel inverter system is proposed. The control method replace the active and reactive power in conventional droop control by active and reactive current derived from dq transformation. This improvement can decrease the influence from output voltage disturbance. To achieve a better performance in current sharing, virtual impedance concept is applied based on droop control. The parallel system controlled by proposed control strategy not only achieves power uncoupling and power sharing, but also has a better dynamic performance. Meanwhile,the system can achieve hot swappability and scalability with a redundancy option. Finally, the simulation proves the correctness of theoretical analysis. |
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| Keywords: | parallel system inverter virtual impedance current sharing |
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