摘要
提出一种新型可连续运行动态电压恢复器,主电路采用级联多电平结构,电网电压经过各隔离变压器后分别进行整流,给逆变单元的直流电容供电,通过电容耦合方式串入电网与负载之间;采用同相补偿法对电网电压进行幅值补偿,并引入改进的dq变换直接在线计算出补偿电压。利用PSIM软件进行仿真分析,并研制了实验样机。仿真及实验结果表明,该动态电压恢复器能够快速、有效补偿电网电压跌落以及电网电压谐波,保证了负载侧的用电质量。
A new-type uninterrupted dynamic voltage restorer is proposed,which adopts mulh-level topology in its main circuit and locates between grid and load via capacitor coupling. Grid voltage is isolated by transformer and rectified to supply DC capacitor. The in-phase compensation is applied for the magnitude compensation of grid voltage and the improved dq transformation for the calculation of compensation voltage. Simulation with software PSIM and experiment of a prototype demonstrate that,the proposed dynamic voltage restorer compensates the voltage drop and voltage harmonies of power grid quickly and effectively,ensuring the power quality at load side.
出处
《电力自动化设备》
EI
CSCD
北大核心
2013年第9期25-30,共6页
Electric Power Automation Equipment
关键词
可连续运行动态电压恢复器
级联多电平
同相补偿法
改进的dq变换
补偿
电压控制
uninterrupted dynamic voltage restorer
cascaded muhi-level
in-phase compensation
improveddq transformation
compensation
voltage control
