Nonlinear Control-Based Modified BFCL for LVRT Capacity Enhancement of DFIG-Based Wind Farm
Nonlinear Control-Based Modified BFCL for LVRT Capacity Enhancement of DFIG-Based Wind Farm
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DOI：
10.1109/tec.2016.2603967
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发表时间：
2017-03
影响因子：
4.9
通讯作者：
Gilmanur Rashid;M. Ali
中科院分区：
文献类型：
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作者：
Gilmanur Rashid;M. Ali
风力发电对现有电网的高渗透率在很大程度上可以归因于双馈感应发电机（DFIG）。然而，它们对电网故障的敏感性引起了对它们大规模集成到现有电力系统中的关注。监管机构和输电系统运营商已实施电网规范，以确保风电场的低电压穿越（LVRT）能力，以实现稳定运行。具有部分额定转换器的流行拓扑结构的DFIG无法单独提供LVRT能力。在这项工作中，提出了一种基于非线性控制的改进型桥式故障电流限制器（NC-MBFCL），以提高基于DFIG的风电场的LVRT能力。NC-MBFCL的效果进行评估，通过性能比较，与传统的控制桥式故障电流限制器（BFCL）和改进的BFCL（MBFCL）。在MATLAB/Simulink环境中对对称和不对称故障进行了大量仿真，结果表明，NC-MBFCL能有效提高DFIG风电场的低电压穿越能力，且性能优于传统控制的BFCL和MBFCL。此外，它被发现，BFCL表现出更好的性能比MBFCL。
High penetration of wind power into existing grid can be attributed largely to the doubly fed induction generators (DFIG). However, their sensitive nature to the grid faults has created concern for their mass integration into the existing power system. The grid code has been imposed by the regulatory bodies and the transmission system operators to ensure the low-voltage ride through (LVRT) capability of the wind farms for stable operation. DFIGs with their popular topology of partially rated converters are unable to provide the LVRT capability alone. In this work, a nonlinear control-based modified bridge-type fault current limiter (NC-MBFCL) is proposed to enhance the LVRT capability of DFIG-based wind farms. The efficacy of the NC-MBFCL is evaluated through performance comparison with that of the conventionally controlled bridge-type fault current limiter (BFCL) and the modified BFCL (MBFCL). Extensive simulations executed in MATLAB/Simulink environment for both the symmetrical and unsymmetrical faults reveal that the proposed NC-MBFCL is very effective in enhancing the LVRT capability of DFIG-based wind farms and outperforms the conventionally controlled BFCL and MBFCL. Also, it was found that the BFCL demonstrates better performance than the MBFCL.