基于双电源交叉供电动态电压恢复装置研究

针对负载侧多敏感设备同时发生电压暂降或中断时,多补偿设备同时工作导致设备间相互影响,降低电压恢复能力的问题,提出一种在母线侧集中补偿的新型大功率动态电压恢复装置结构。该结构采用将动态电压恢复器(DVR)与不间断电源(UPS)相结合,并基于双电源(两条独立母线电源)交叉供电方式,通过控制补偿装置的孤岛与并网运行模式的切换,伴随补偿装置工作在孤岛运行模式、孤岛与并网相互切换方以及并网运行模式3种状态,实现两段母线的交叉供电,确保了电网中敏感负荷的供电可靠性。试验仿真表明,该结构能大大提高动态电压恢复装置的输出电压能力,实现了母线侧电压暂降与中断的长时间集中补偿,进一步提高了敏感负荷的供电可靠性。

Research on Dynamic Voltage Restoration Device Based on Double Bus Crossing Power Supply

Aiming at the problem that multi-compensation devices work at the same time when voltage sags or interruptions occur in load-side multi-sensitive devices, which results in the interaction between devices and reduces the voltage recovery ability, a new structure of high-power dynamic voltage recovery device with centralized compensation at bus-side is proposed. The structure combines dynamic voltage restorer (DVR) with uninterruptible power system (UPS), and based on double power supply mode, by controlling the switching of islanding and grid-connected operation modes of compensation devices, the micro-grid works in three states: islanding operation mode, islanding and grid-connected mutual switching mode and grid-connected operation mode, the cross-supply of two-section buses is realized, and the reliability of sensitive loads in the micro-grid is ensured. The simulation results show that the structure can greatly improve the output capacity of the device, realize the long-term centralized compensation of voltage sag and interruption at bus side, and further improve the reliability of power supply for sensitive loads.