摘要
动态电压恢复器是目前解决电压凹陷问题的较好选择,基于p-q-r理论,提出了一种在三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。
At present,dynamic voltage restorer （DVR） is a better manner to solve the voltage sag problem. According to the p-q-r theory, a real-time method to detect voltage sag 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.
出处
《科学技术与工程》
2008年第8期2222-2225,共4页
Science Technology and Engineering
基金
甘肃省科技攻关(GS044-A52-001-24)资助
