摘要
针对微电网中存在的电压质量问题,提出了基于光蓄发电单元的动态电压恢复器(dynamic voltage restorer,DVR)。DVR以光蓄发电单元为储能单元,通过整流器串联接入到低压配电网与微电网公共连接处。提出了DVR的动态电压恢复方式、不间断供电方式和微电源方式的3种运行模式。通过对系统开关信号进行合理控制,实现3种模式的有效切换,提高DVR设备的利用率。DVR的动态电压恢复方式可有效抑制电压暂降或骤升,改善微电网电压质量;不间断供电方式可提高对负荷的供电可靠性;微电源方式可以减少主网的电能供给,实现节能减排。算例结果验证了DVR的有效性。
In allusion to dissatisfied voltage quality of microgrid,a dynamic voltage restorer（DVR） based on photovoltaic（PV） generation/battery units is proposed.Utilizing PV generation/battery units as energy storage component and via rectifier,the proposed DVR is connected in series with the point of common coupling（PCC）,where the microgrid low-voltage is connected to distribution network.Three operating modes of DVR,namely the dynamic voltage restoration mode,the uninterruptible power supply mode and the micro-source mode,are put forward.Through reasonably control strategy,the switching-over among the three operation modes can be effectively implemented to improve the utilization rate of DVR.The dynamic voltage restoration mode of DVR can suppress voltage sag and voltage swell effectively,thus the voltage quality is improved;the uninterruptible power supply mode can improve the reliability of power supply;using the micro-source mode,the power supply from power grid can be reduced and it is favorable for energy conservation and emission reduction.The effectiveness of the proposed DVR is verified by results of simulation based on Matlab /Simulink.
出处
《电网技术》
EI
CSCD
北大核心
2013年第3期610-615,共6页
Power System Technology
基金
国家国际科技交流与合作专项(2010DFB63200)
"山西省高等学校中青年拔尖创新人才支持计划资助"的资助~~
关键词
动态电压恢复器
微电网
电能质量
电压质量
节能减排
DVR
microgrid
power quality
voltage quality
energy conservation and emission reduction
