相似理论在大功率电力电子装置试验中的应用

Application of Similarity Theory in High Power Electronics Equipment Test

大功率电力电子技术的产业化需要强有力的试验支持,而容量不断增长的设备很难直接在电力系统中进行试验,必须采用等效的方法和试验系统。因此试验等效性的研究尤为重要。相似理论是描述各种现象相似原理的学说。该文将相似理论的原理和方法应用于大功率电力电子装置试验的等效性研究,提供了一种新的手段。简单介绍了相似理论及其在试验等效研究中的应用;分别应用定律法、量纲法和方程法3种相似分析方法针对不同试验研究对象的特点进行了分析和研究,并给出了2个实例,根据不同的试验目的,2个实例中试品的相似处理也不同;最后应用相似畸变的概念,对等效误差进行了分析。

The development of high power electronics industry needs powerful backing of test. However, the trend towards ever-higher unit ratings has made it almost impossible to test the equipment in the real system directly. So the test equivalence mechanism gets more important. Based on the similarity theory, which reveals the basic laws of the systems similarity, the test equivalence mechanism and equivalence design were studied. The similarity laws and their application in the test study were introduced. The analytic methods using respectively law, dimension and equation were introduced and their applications in the test equivalence study were expounded Two test cases were discussed in which the same test object adopts different similarity treatments. The equivalence errors were analyzed using similarity distortion concept.