大连海事大学学报 >
2015 , Vol. 41 >Issue 3: 115 - 123
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2015.03.021
基于自适应滑模和下垂控制的微源逆变器并联运行策略
收稿日期: 2014-08-28
修回日期: 2014-10-27
网络出版日期: 2014-10-27
基金资助
中央高校基本科研业务费专项资金资助项目(3132014322).
Parallel operation for the micro-source inverters based on adaptive sliding-mode and droop controls
Received date: 2014-08-28
Revised date: 2014-10-27
Online published: 2014-10-27
针对微源逆变器并联运行过程中存在的负荷扰动和功率分担精度问题，在组合式三相四线制逆变器拓扑的基础上，提出一种新的三环控制策略.该策略包含滑模电压内环、虚拟阻抗环和功率外环.其中，电压内环通过自适应鲁棒三阶滑模控制有效提高了逆变器的抗干扰和动态性能；在分析滑模电压闭环逆变器等效输出阻抗的基础上，分析了输出阻抗和线路阻抗对功率分配的影响机理，进而针对不同功率等级逆变器设计虚拟阻抗反馈系数，使逆变器等效输出阻抗呈阻性并满足功率分配的要求；最后，在传统下垂控制外环中加入暂态下垂项，用于消除系统中的低频振荡，并提高逆变器的动态性能.仿真分析和单相实验结果均验证了上述控制策略的有效性和鲁棒性.
张勤进 , 刘彦呈 , 王 川 , 王 宁 . 基于自适应滑模和下垂控制的微源逆变器并联运行策略[J]. 大连海事大学学报, 2015 , 41(3) : 115 -123 . DOI: 10.16411/j.cnki.issn1006-7736.2015.03.021
To solve load disturbance and power sharing accuracy problems of parallel micro-source inverters, a new three-loop control strategy based on the combined three-phase four-wire inverter topology was conducted. And the control strategy was composed of the sliding-mode voltage inner loop, virtual output impedance loop and power outer loop. The adaptive robust three-order sliding-mode control was used in the voltage inner loop to improve the dynamic characteristic and disturbance rejection performance. On the basis of analyzing the inverter equivalent output impedance of sliding-mode voltage inner loop, the effect of the output impedance and line impedance on power sharing was analyzed, and the virtual impedance feedback gains were designed for the inverters with different power ratings, so the equivalent output impedances of inverters can be resistive and meet the requirements of power sharing.Finally, the transient droop terms were added into the conventional power outer loop to eliminate the low frequency oscillation and improve the dynamic response. Simulation analysis and single-phase experiment results varified the effectiveness and robustness of the proposed control strategy.
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