电压暂降导致的电动机动态过程的研究

发布时间：2018-04-29 01:17

本文选题：电压暂降 + 电压短时中断　；参考：《中国矿业大学（北京）》2014年博士论文

【摘要】：电压暂降和短时中断是我国面临的重要电能质量问题，两者占到全部工业电能质量问题的92%以上。首先研究了电力系统高压输配电线路中的电压暂降经变压器向受电终端低压母线传递时的变化规律。根据简化模型，研究了电压短时中断后三相异步电动机的最大低电压穿越能力。应用对称分量法，提出了三相不对称电压暂降时电动机转差率与临界时间的计算方法。为了减小电压暂降对电动机等敏感设备的影响，需要对其补偿，而电压暂降的检测是实现补偿的前提。提出了基于微分方程的单相电压暂降检测法，应用同步坐标变换法实现了三相不对称电压暂降的检测。提出了基于αβ静止坐标系改进瞬时对称分量法的电压暂降检测新方法。将复域瞬时对称分量法引入到电压暂降的检测中，，提出了复域abc/dq变换和120/dq变换两种检测方法。Matlab下的仿真结果证明了所提检测方法的有效性。最后，介绍了分布式电压暂降监测系统的整体结构与软件组成。
[Abstract]:Voltage sags and short-time interruptions are the important problems of power quality in China. Both of them account for more than 92% of the total industrial power quality problems. First, the change rules of voltage sags in the power transmission and distribution lines of the power system are studied by the transformer to the low-voltage busbar of the terminal. The maximum low voltage crossing ability of the three phase asynchronous motor after the fracture is used. Using the symmetric component method, the calculation method of the change rate and the critical time of the motor is proposed. In order to reduce the influence of the voltage sags to the sensitive equipment such as the motor, it is necessary to compensate for the voltage sags, and the detection of voltage sags is the precondition of realizing the compensation. A single phase voltage sags detection method based on differential equation is proposed. The detection of three-phase asymmetric voltage sags is realized by using synchronous coordinate transformation method. A new method of Voltage Sags Detection is proposed based on the improved instantaneous symmetric component method based on the stationary coordinate system of alpha beta. The simulation results under the two detection methods of domain abc/dq transform and 120/dq transform,.Matlab, prove the effectiveness of the proposed method. Finally, the whole structure and software composition of the distributed voltage sags monitoring system are introduced.

【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM343.2

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