Second-order sliding mode control of wind turbines to enhance the fault-ride through capability under unbalanced grid faults,International Journal of Circuit Theory and Applications

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Second-order sliding mode control of wind turbines to enhance the fault-ride through capability under unbalanced grid faults
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2021-04-19 , DOI: 10.1002/cta.3023
Khalfallah Tahir _{1,

2} , Tayeb Allaoui ₂ , Mouloud Denai ₃ , Saad Mekhilef ₄ , Cheikh Belfedal ₂ , M'hamed Doumi ₅

Affiliation

The integration of wind generation to the grid is growing rapidly across the world. As a result, grid operators have introduced the so-called grid codes (GC), which nowadays include a range of technical conditions and requirements, which wind generators must fulfill. Among these, the low-voltage ride through (LVRT) is a requirement for wind turbines to stay connected to the grid and continue to operate during the disturbance. In this study, a control structure, combining inertial kinetic energy storage with a crowbar circuit, is proposed to enhance the ride through capability of a wind turbine generator (WTG) based on a wound-field synchronous generator (WFSG) under unsymmetrical voltage dips. For the grid-side converter (GSC), a decoupled double synchronous reference frame (DDSRF) d-q current controller is used. Furthermore, a second-order sliding mode controller (SOSMC) with super-twisting (ST) algorithm is proposed for the GSC and the machine-side converter (MSC) to improve the response speed and achieve an accurate regulation of the dq-axis current components simultaneously. The main objectives of the GSC are to achieve a balanced, sinusoidal current and smooth the real and reactive powers to reduce the influence of the negative-sequence voltage. A series of simulations are presented to demonstrate the effectiveness of the proposed control scheme in improving the LVRT capability of the WFSG-driven wind turbine and the power quality of the system under unbalanced grid voltage conditions.

中文翻译：

风电机组二阶滑模控制提高电网不平衡故障下的故障穿越能力

风力发电与电网的整合正在世界范围内迅速发展。因此，电网运营商引入了所谓的电网规范 (GC)，如今该规范包括一系列风力发电机必须满足的技术条件和要求。其中，低电压穿越（LVRT）是风力涡轮机在扰动期间保持与电网连接并继续运行的要求。在这项研究中，提出了一种将惯性动能存储与撬棒电路相结合的控制结构，以提高基于绕线同步发电机 (WFSG) 的风力涡轮发电机 (WTG) 在不对称电压骤降下的穿越能力。对于网侧变流器 (GSC)，解耦双同步参考系 (DDSRF) d - q使用电流控制器。此外，针对GSC和机侧转换器（MSC）提出了具有超扭曲（ST）算法的二阶滑模控制器（SOSMC），以提高响应速度并实现dq轴电流的精确调节组件同时进行。GSC 的主要目标是实现平衡的正弦电流并平滑有功和无功功率，以减少负序电压的影响。一系列仿真结果证明了所提出的控制方案在提高 WFSG 驱动风力涡轮机的 LVRT 能力和电网电压不平衡条件下系统电能质量方面的有效性。

更新日期：2021-04-19

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