Effects of voltage sags on AC motor drives

1997 IEEE Annual Textile, Fiber and Film Industry Technical Conference Pub Date : 1997-05-06 DOI:10.1109/TEXCON.1997.598533

E. R. Collins, A. Mansoor

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引用次数: 60

Abstract

Voltage sags are normally described by magnitude variation and duration. In addition to these quantities, sags are also characterized by unbalance (asymmetry), nonsinusoidal waveshapes, and phase angle shift (phase jump). These factors are important for determining the behavior of AC motor drives during sags. Voltage unbalance and phase angle shifts cause large unbalanced source currents to excessive voltage ripple in the DC-link, and reduced DC-link average voltage. The response of the motor and drive to these varies considerably. Experimental results clearly show the load dependent behavior of a typical drive. The ability of the drive to ride-through a voltage sag is dependent upon the energy storage capacity of the DC-link capacitor, the speed and inertia of the load, the power consumed by the load, and the trip point settings of the drive. The control system of the drive has a great impact on the behavior of the drive during the sag and after recovery. The trip point settings of many drives can by field-adjusted and greatly improve many nuisance trips resulting from minor voltage sags.

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电压跌落对交流电机驱动的影响

电压跌落通常用幅度变化和持续时间来描述。除了这些量之外，下垂还具有不平衡(不对称)、非正弦波形和相位角移位(相位跳变)的特征。这些因素对于确定交流电机驱动器在凹陷期间的行为很重要。电压不平衡和相角偏移会导致不平衡源电流在直流链路中产生过大的电压纹波，降低直流链路的平均电压。电机和驱动器对这些的响应变化很大。实验结果清楚地显示了典型驱动器的负载依赖行为。驱动器穿越电压凹陷的能力取决于直流链路电容器的能量存储容量、负载的速度和惯性、负载消耗的功率以及驱动器的跳闸点设置。驱动器的控制系统对驱动器在凹陷期间和恢复后的行为有很大的影响。许多驱动器的跳闸点设置可以通过现场调整，并大大改善由轻微电压跌落引起的许多令人讨厌的跳闸。

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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1997 IEEE Annual Textile, Fiber and Film Industry Technical Conference

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