虚拟仪器在三相不平衡度测量中的应用研究

Applied Research of Virtual Instrument in Measuring Three-Phase Unbalance Factor

三相不平衡度是衡量电能质量的重要指标之一。随着各种非线性负载的大量应用,电能质量不断恶化。为保证电力系统安全稳定运行,需要对三相不平衡度进行实时检测。文章以虚拟仪器技术为平台,对电压、电流的正序、负序及零序分量的分解算法进行了深入研究,进而测量出电力系统的三相不平衡度。实例表明本文设计的三相不平衡度检测系统,不仅测量精度高,而且具有很强的扩展性,可以进一步应用于电能质量谐波参数的测试。

Three-phase unbalance factor is one of the important indicators in measure of power quality. With a wide application of nonlinear loads, power quality has been deteriorating much. To ensure the operation of electric power systems stable and safe, it is a very urgent need for real-time detection of Three-Phase unbalance factor. With the virtual instrument technology as a platform, the algorithms of positive-sequence component, negative-sequence component and zero-sequence component about voltage and current have been studied deeply in this paper, and three-phase unbalance factor can be further measured in power system. The example shows that three-phase unbalance factor detection system designed in this paper not only has high measuring accuracy but also possesses strong expandability, which will be used in measuring harmonic parameters of power quality.