基于系统稳定性分析的微电网阻抗测量技术  

New Techniques for Measuring Impedance Characteristics of an Islanded Microgrid Based on Stability Analysis

作　　者：侯李祥[1] 卓放[1] 师洪涛[1] 张东[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2015年第22期153-162,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51177130);台达2011电力电子科教发展计划重点项目(DREK2011002)资助

摘　　要：微型电网的稳定性与系统的控制方式以及组网设备的各种参数有关,而这些重要的参数又与微电网的阻抗参数有一定的联系。因此系统输入输出阻抗是分析微电网稳定性的重要参数。本文对阻抗判据进行了进一步的推导,使其在工程中的应用更加简单;在阻抗判据的基础上提出了一种基于方波电流注入的阻抗测量技术;通过理论分析计算了微电网各组网部分以及微电网整体的阻抗参数;搭建了三相交流微型电网的仿真模型;开发了交流系统谐波阻抗测量装置。计算、仿真与实验结果验证了所提出的方法的正确性与有效性。Microgrid stability is related to system control mode and various parameters of the system. These important parameters of microgrid have some connection with impedance parameters. Therefore, the input and output impedance is an important parameter to analyze the microgrid stability. Impedance criterion is further deduced to make it easy to use. This paper also introduces a new method of impedance measurement for microgrid based on square wave current injection. In order to verify the measurement results, microgrid impedance of each part and the impedance of overall microgrid are calculated. A simulation model of the three-phase AC microgrid is developed in PSCAD. The AC system harmonic impedance measuring device is developed. Measurements verify the proposed new technique.

关 键 词：微型电网 阻抗测量 方波 电流注入 

分 类 号：TM712[电气工程—电力系统及自动化]