Predictive Current Control of Three-Phase Grid-Connected Converters With Constant Switching Frequency for Wind Energy Systems
Predictive Current Control of Three-Phase Grid-Connected Converters With Constant Switching Frequency for Wind Energy Systems
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DOI：
10.1109/tie.2012.2225394
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发表时间：
2013-06
影响因子：
7.7
通讯作者：
Zhanfeng Song;C. Xia;Tao Liu
中科院分区：
文献类型：
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作者：
Zhanfeng Song;C. Xia;Tao Liu
提出了一种基于扩展状态观测器（ESO）的预测电流控制器，用于风力发电系统的并网。在每个采样周期，所提出的策略计算转换器的开关时间，最大限度地减少成本函数定义为平方电流误差的总和，导致恒定的开关频率。为了获得良好的动态性能，分析了采样延迟的影响，并提出了详细的补偿方法。此外，ESO的构造，以抑制参数变化和建模误差，影响控制器的性能。分析了观测器的参数整定和稳定性。所提出的策略不仅呈现出快速的动态响应，由于使用的预测电流控制器，但也具有鲁棒性的控制性能作为观测算法的结果。仿真和实验结果验证了该方法的有效性。
A predictive current controller with an extended-state observer (ESO) is proposed for grid integration of wind energy systems. In each sampling period, the proposed strategy calculates the converter switching time that minimizes a cost function defined as a sum of squared current errors, leading to constant switching frequency. To achieve excellent dynamic performance, the impact of sampling delay is analyzed, and detailed compensation methods are proposed. In addition, an ESO is constructed to suppress parameter variations and modeling errors, which affect the performance of the controller. The parameter tuning and the stability of the observer are analyzed. The proposed strategy not only presents rapid dynamic response due to the use of the predictive current controller but also possesses robust control performance as a result of the observation algorithm. Simulation and experimental results are given to validate the effectiveness of the proposed solution.