Apply frequency conversion technique to save energy, improve the shift peak load capacity of electric network for the units and ensure the safe and stability operation of network.

利用变频调速技术节约电力，提高电网对机组的调峰能力，保证电网的安全稳定运行。

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Because of the temperature rising of ultrasonic motors, load changes, and vicinal surrounding changes and so on, the resonant frequency will shift, leading to working stability drop.

由于超声波电机的温升、负载变化及周围环境变化等原因，使电机的谐振频率发生漂移，这将影响超声波电机运行的稳定性。

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Through analysis of the stability of NanBian power supply system in a steel enterprise, under-frequency load-shedding plans and regional security and stability control plans are adopted in this paper.

本文通过对某钢铁企业南变电力系统的稳定性分析，给出了低频减载和区域安全稳定控制两种方案。

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