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Advanced Control of Grid-connected Current Source Converter under Unbalanced Grid Voltage Conditions
IEEE Transactions on Industrial Electronics ( IF 7.7 ) Pub Date : 2018-12-01 , DOI: 10.1109/tie.2018.2835367
Xiaoqiang Guo , Yong Yang , Xue Zhang

There are technical challenges when the grid-connected current source converter operates under unbalanced grid voltage conditions. The negative sequence component of the unbalanced grid voltage would result in the low-frequency ripple at dc side, as well as current harmonics at ac side. It has an adverse impact on the system operation. In order to solve the problem, the system mathematical model is established in this paper. The limitation of the conventional control strategy is clearly clarified. And then, the improved control strategy is discussed from the viewpoint of constant instantaneous active power. In order to further enhance the system performance, a new control strategy is proposed. Instead of the complicated instantaneous power theory, the proposed solution is a direct control strategy. Both the low-frequency dc-side ripple and ac-side current harmonics can be significantly reduced with a simple control structure, due to the direct control concept. Finally, the comparison evaluation of the conventional and proposed control strategies is carried out. The experimental results verify the effectiveness of the proposed solution.

中文翻译:

电网电压不平衡条件下并网电流源换流器的高级控制

当并网电流源换流器在电网电压不平衡条件下运行时,存在技术挑战。不平衡电网电压的负序分量会导致直流侧低频纹波,以及交流侧电流谐波。对系统运行产生不利影响。为了解决这个问题,本文建立了系统数学模型。传统控制策略的局限性得到了明确的阐明。然后,从恒定瞬时有功功率的角度讨论了改进的控制策略。为了进一步提高系统性能,提出了一种新的控制策略。所提出的解决方案不是复杂的瞬时功率理论,而是直接控制策略。由于采用了直接控制概念,因此可以通过简单的控制结构显着降低低频直流侧纹波和交流侧电流谐波。最后,对传统控制策略和提出的控制策略进行了比较评估。实验结果验证了所提出解决方案的有效性。
更新日期:2018-12-01
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