高电压技术2011，Vol.37Issue(1)：176-183,8.
链式动态电压恢复器的新型控制策略分析与设计
New Control Strategy Analysis of the Cascaded Dynamic Voltage Restorer
摘要
Abstract
Cascaded dynamic voltage restorer (DVR) which is an effective setup in modifying the power quality problems caused by voltage sags has been applied in the power system. Thereby, the carrier phase-shifted modulation technology was used in the cascaded multilvevel inverter. A 5 MVA uncoupled transformer 11-1evel cascaded DVR was researched for the 6 kV power system. The double loop control strategy was designed which employed a slow outer voltage loop and a fast inner current loop. Voltage sag was simulated at a random time when multi-level DVR was under the control of any control strategy. Results show that the DVR based on voltage shifted pulse width modulation technology can greatly increase the inverter switching frequency and decrease the harmonic distortion and variation rate of voltage, and the system damping ratio and stability and error can be regulated by adjusting relevant parameters. The application of this technology can greatly enhance the performance indicators of DVR and has a high practical value.关键词
动态电压恢复器(DVR)/电压跌落/电能质量/载波移相/级联多电平/双闭环控制器Key words
dynamic voltage restorer(DVR)/voltage sag/power quality/carrier phase-shifted modulation/cascade multilevel/double cloop control strategy分类
信息技术与安全科学引用本文复制引用
何杰,周雪松,陈山中,吕永红,吴斌,王四保..链式动态电压恢复器的新型控制策略分析与设计[J].高电压技术,2011,37(1):176-183,8.基金项目
国家自然科学基金(50877053). （50877053）
