Virtual SM-DFIG based automatic control strategy for enhancing the power quality in microgrids

Y. V. Pavan Kumar, R. Bhimasingu
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Abstract

Conventional rotary electrical machines based power plants achieve good quality in power conversion due to the provision of smooth automatic generation control and voltage regulation. But, in case of renewable energy based microgrids, the inherent involvement of static power electronics based power conversion raises the issues of poor power quality and instability during uncertainties due to lack of effective control facility and sufficient moment of inertia. So, an attractive way of mitigating the above mentioned key concerns is to make the microgrid's operation similar to rotary electrical machines based power plant by retaining the advantages of using power electronic converter. With this idea, this paper proposes “Virtual Synchronous Motor (SM)-Doubly Fed Induction Generator (DFIG) based Automatic Control Strategy (VSMIGC)” for microgrids. This provides controlled modulating signals to control the output of the pulse width modulated power electronic inverter used in microgrids. For the performance analysis of the proposed VSMIGC, various power quality indices are measured during uncertainties and compared with those of conventional “Voltage-Current Control Strategy (VIC)” based inverters with respect to standard limits. From results, it is seen that the use of VSMIGC has improved the power quality characteristics of renewable energy microgrids.
基于虚拟SM-DFIG的微电网电能质量自动控制策略
传统的旋转电机发电厂由于提供了平滑的自动发电控制和电压调节,在电力转换中取得了良好的质量。但是,在基于可再生能源的微电网中,由于缺乏有效的控制设施和足够的转动惯量,基于静态电力电子的电力转换的固有参与引起了不确定期间电能质量差和不稳定的问题。因此,缓解上述关键问题的一个有吸引力的方法是,通过保留使用电力电子转换器的优点,使微电网的运行类似于基于旋转电机的发电厂。基于这一思想,本文提出了基于虚拟同步电机-双馈感应发电机的微电网自动控制策略(VSMIGC)。这提供了可控的调制信号来控制微电网中使用的脉宽调制功率电子逆变器的输出。为了分析所提出的VSMIGC的性能,在不确定条件下测量了各种电能质量指标,并与基于“电压电流控制策略”(VIC)的传统逆变器在标准限值下的电能质量指标进行了比较。从结果可以看出,VSMIGC的使用改善了可再生能源微电网的电能质量特性。
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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