This article proposes an induction motor variable frequency drive to investigate its potential in handling smart grid's frequency. This can thus mitigate the grid reliance on expensive power plants. To this end, a primary frequency controller is presented enabling the drive to reduce its power in proportion to grid frequency drop. The dynamic limitation of the drive due to load's inertia is considered through a motor's speed rate limiter. Moreover, an appropriate inertia emulator is proposed for the smart drive by inspiring the inertial response of a direct-on-line motor. The impacts of speed rate, maximum reserve power and motor driven load's inertia on dynamic behavior of the smart motor load during the frequency support are addressed. Besides, the effectiveness of the smart drive's contribution in primary frequency regulation of the IEEE 39-bus test system is explored. In this regard, a critical droop coefficient that guarantees the maximum reserve power delivery for the smart drives is analytically derived. Finally, the proposed approach is extended to include the critical droop derivation for a set of smart drives with different sizes and priorities to rank their participation in primary frequency regulation process.

中文翻译：

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用于初级频率调节的智能感应电机变频驱动器

本文提出了一种感应电机变频驱动器，以研究其在处理智能电网频率方面的潜力。因此，这可以减轻电网对昂贵发电厂的依赖。为此，提出了一个主频率控制器，使驱动器能够与电网频率下降成比例地降低其功率。由于负载惯性引起的驱动器动态限制是通过电机的速度限制器来考虑的。此外，通过激发直接在线电机的惯性响应，为智能驱动器提出了合适的惯性模拟器。解决了频率支持期间速度、最大储备功率和电机驱动负载惯量对智能电机负载动态行为的影响。此外，智能驱动的有效性' 探讨了 IEEE 39 总线测试系统的初级频率调节中的贡献。在这方面，通过分析推导出保证智能驱动器的最大储备功率传输的临界下垂系数。最后，将所提出的方法扩展到包括一组具有不同大小和优先级的智能驱动器的临界下垂推导，以对其参与初级频率调节过程进行排名。