Direct power control of a brushless doubly-fed induction generator under an unbalanced power grid

2023 2nd Asia Conference on Electrical, Power and Computer Engineering (EPCE) Pub Date : 2023-04-01 DOI:10.1109/EPCE58798.2023.00026

Xiaoliang Yang, Jiajun Bai, Yixuan Qin, Jiane Zhao

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Abstract

The output power of the brushless doubly-fed generator (BDFIG) in unbalanced power system contains the second-harmonic fluctuation and the stator current is distorted. To reduce the influnce of unbalanced power grid on BDFIG, the composition of instantaneous active and reactive power of BDFIG stator output under unbalanced power grid is deduced and analyzed, and a new approaching rate integral sliding mode variable structure with PI controller is proposed. The integral sliding mode variable structure is used to control the DC component of the output power of BDFIG under the unbalanced power grid. The double frequency fluctuation of power and the distortion of stator current are suppressed by PI control of stator current instruction. Finally, the influence of unbalanced power grid on BDFIG is reduced. In this article, the calculation principle of voltage positive and negative sequence decomposition for unbalanced power grid voltage is studied, and a fast positive and negative sequence decomposition method is designed to improve the delay problem of T/4 delay separation method, the BDFIG direct power control capability under unbalanced grid voltage is improved effectively. Finally, Matlab/Simulink simulation results demonstrate the effectiveness of the control strategy.

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不平衡电网下无刷双馈感应发电机的直接功率控制

在不平衡电力系统中，无刷双馈发电机(BDFIG)的输出功率存在二次谐波波动，定子电流存在畸变。为减小电网不平衡对BDFIG的影响，推导并分析了电网不平衡下BDFIG定子输出瞬时有功和无功的组成，提出了一种新的带PI控制器的逼近速率积分滑模变结构。采用积分滑模变结构对不平衡电网下BDFIG输出功率的直流分量进行控制。通过定子电流指令的PI控制，抑制了功率的双频波动和定子电流的畸变。最后，减小了电网不平衡对BDFIG的影响。本文研究了不平衡电网电压正负序分解的计算原理，设计了一种快速正负序分解方法，改进了T/4延迟分离法的延迟问题，有效提高了BDFIG在不平衡电网电压下的直接功率控制能力。最后通过Matlab/Simulink仿真验证了控制策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2023 2nd Asia Conference on Electrical, Power and Computer Engineering (EPCE)

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