p-q-r理论在单相DVR中的应用研究

动态电压调节器是目前解决电压凹陷问题的较好选择,文章基于p-q-r理论,通过以单相电源作为参考电压构造虚拟三相系统及多次坐标变换,提出了一种在单相系统中实时检测电压凹陷并计算补偿电压的方法.电源侧电压的基波分量经过坐标变换后在p-q-r坐标下变为直流分量,在p-q-r坐标下控制器能快速计算出电压有效值和补偿电压,p-q-r坐标下的补偿电压经过反变换即可得到a- b-c坐标下各相的补偿电压.基于p-q-r理论的检测方法具有很好的静态和动态特性,仿真结果证明了该方法的正确性.

APPLICATION OF p-q-r THEORY IN SINGLE-PHASE DYNAMIC VOLTAGE REGULATOR

At present dynamic voltage regulator (DVR) is a better manner to solve the voltage sag. According to the p-q-r theory and by means of constituting a suppositional three phases system by using single phase power supply as voltage reference and conducting the repeatedly coordinate transformation, a real-time method to detect voltage sag in single phase system and calculate the compensating voltage is proposed. After the coordinate transformation the fundamental component at power supply side becomes the dc component in p-q-r coordinate system, so the controller in p-q-r coordinate system can rapidly calculate the effective value of voltage and compensating voltage. By means of inverse transformation, the compensating voltage of three phases in a-b-c coordinate system can be obtained from the compensating voltage in p-q-r coordinate system. The detection method based on p-q-r theory possesses good static and dynamic characteristics. Simulation results show that the proposed method is correct.