【作者】 李希年；

【导师】 王彦文；

【作者基本信息】 中国矿业大学（北京） ， 控制理论与控制工程， 2014， 博士

【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。更多还原

【Abstract】 Voltage sag and short interruption are important issues facing our country, which accountedfor more than92%of all industrial power quality problems. The transmission of voltage sagstook place in transmission and distribution lines through transformers to low tension bus areanalyzed. According to its simplified first-order model, the low-voltage ride through capability(LRTC) of induction motor (IM) after voltage short interruption is studied. The analyticexpressions of IM slip and critical time under three-phase asymmetrical voltage sag (TAVS) arededuced by applying symmetrical component. The voltage sag detection is an essentialprerequisite for its compensation in order to reduce its impact on IM and other sensitiveequipments. The single-phase voltage sag (SVS) detection based on differential eguation is putforward. The synchronous coordinate transformation is used for the dectection of TAVS. And thedetection method using improved instantaneous symmetrical component (IISC) based on αβstationary frame is proposed to get the DC voltage of dq rotating frame directly. Thecomplex-domain instantaneous symmetrical component (CISC) is introduced to the voltage sagdetection filed, and two complex-domain detection methods which are abc/dq transformationand120/dq transformation are put forward. Simulation results demonstrate the effectiveness ofthe proposed detection method. Finally, the overall structure and software configuration of thedistributed voltage sag monitoring system is introduced.更多还原