摘要
SVG在柔性交流输电中得到广泛应用,其主要缺点之一是各功率单元直流侧的电压不平衡。论文基于功率单元的数学模型和瞬时无功功率理论,深入研究了功率单元电压平衡控制策略。在坐标变换中,取电流矢量为d轴,控制输出电压的直轴分量就可以保持直流侧电压平衡。根据功率平衡原理,提出了控制器的设计计算方法。仿真结果验证了该方法的正确性。
As an important member of FACTS family, SVG has got more and more widely application. One of the main disadvantage of SVG based on cascaded H-bridge converter is the voltage unbalance that could appear on the DC side of different H-bridges. The proposed control strategy to balance DC voltage of power cells was studied by this paper based on the mathematical model of power cell and the instan- taneous reactive power theory. In the coordinate transformation,on the d-axis is the SVG output current vector, the d-axis projection of the output voltage vectors would he used to control DC voltage balancing. The design and calculation method of the controller based on power balancing principle is given. The result of simulation have proved the correctness.
出处
《计算机与数字工程》
2013年第10期1625-1627,共3页
Computer & Digital Engineering
