论文部分内容阅读
为消除瞬时电压扰动,提高电压质量,在介绍了不间断运行动态电压恢复器(UDVR)的工作原理、拓扑结构、工作模式及电压补偿策略后,提出了应用小波变换来检测动态电压恢复器中电压畸变特征量的方法,该算法对电源电压发生跌落、骤升、三相不平衡、伴随谐波等运行工况实现了畸变分量幅值和相位的无延时检测。以最新的三单相电压源型逆变电路独立补偿主电路取代传统的三相同时补偿,对UDVR在不同工况下的动态电压补偿特性进行了仿真实验研究。结果表明采用小波变换的UDVR具有较好的实时性和补偿灵活度,可以有效地抑制电网中各种电压暂态扰动,是解决电压型电能质量问题的有效手段,能满足敏感电力负荷在复杂电压暂态环境下的不间断运行。
In order to eliminate the instantaneous voltage disturbance and improve the voltage quality, after introducing the working principle, topological structure, working mode and voltage compensation strategy of UDVR, the application of wavelet transform to detect dynamic voltage restorer Voltage distortion characteristics of the method, the algorithm of the power supply voltage drop, surge, three-phase imbalance, with harmonics and other operating conditions to achieve the distortion component amplitude and phase delay detection. With the latest three single-phase voltage source inverter circuit independent compensation of the main circuit instead of the traditional three-phase simultaneous compensation, UDVR under different conditions dynamic voltage compensation characteristics of a simulation study. The results show that the UDVR with wavelet transform has good real-time and compensation flexibility and can effectively suppress various voltage transient disturbances in the power grid. It is an effective measure to solve the voltage-type power quality problem and can meet the requirements of sensitive power load at complex voltage Transient operation of the environment.