A Robust Control Scheme for Medium-Voltage-Level DVR Implementation
A Robust Control Scheme for Medium-Voltage-Level DVR Implementation
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DOI：
10.1109/tie.2007.894771
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发表时间：
2007-07
影响因子：
7.7
通讯作者：
Y. Li;D. Vilathgamuwa;F. Blaabjerg;P. Loh
中科院分区：
文献类型：
--
作者：
Y. Li;D. Vilathgamuwa;F. Blaabjerg;P. Loh
本文针对中压（MV）级动态电压恢复器（DVR）系统，设计并实现了一种外部Hinfin电压控制环和内部电流控制环的鲁棒控制方案。通过对加权函数的简单选择，合成的Hinfin控制器将在正序列和负序列基频附近表现出显著的增益，因此，它将能够有效地调节正序列和负序列分量，面对系统参数变化具有显着的鲁棒性。详细讨论了Hinfin控制器权重函数的选择、电流内环的整定和系统抗干扰能力。最后，设计的控制方案在实验室10kv mv级DVR系统上进行了广泛的测试，该系统具有不同的电压凹陷（平衡和不平衡）和负载（线性/非线性负载和感应电机负载）条件。结果表明，所提出的控制方案在平衡和不平衡凹陷补偿和负载干扰抑制方面都是有效的，并明确了其鲁棒性。
In this paper, a robust control scheme with an outer Hinfin voltage control loop and an inner current control loop is designed and implemented on a medium-voltage (MV)-level dynamic voltage restorer (DVR) system. Through a simple selection of weighting functions, the synthesized Hinfin controller would exhibit significant gains in the vicinity of positive- and negative-sequence fundamental frequencies, and therefore, it would be able to regulate both positive- and negative-sequence components effectively, with explicit robustness in the face of system parameter variations. A detailed discussion of Hinfin controller weighting function selection, inner current loop tuning, and system disturbance rejection capability is presented. Finally, the designed control scheme is extensively tested on a laboratory 10-kV MV-level DVR system with varying voltage sag (balanced and unbalanced) and loading (linear/nonlinear load and induction motor load) conditions. It is shown that the proposed control scheme is effective in both balanced and unbalanced sag compensation and load disturbance rejection, as its robustness is explicitly specified.