微网脱/并网运行模式平滑切换控制策略  

Control Strategy for Smooth Transfer Between Grid-connected and Island Operation for Micro Grid

作　　者：徐晓宁[1,2,3] 周雪松 XU Xiaoning;ZHOU Xuesong(School of Electrical Engineering and Automation,Tianjin University,Tianjin 300072,China;School of Electrical Engineering,Tianjin University of Technology,Tianjin 300384,China;Tianjin Key Laboratory of Control Theory ＆ Applications in Complicated Systems,Tianjin 300384,China)

机构地区：[1]天津大学电气与自动化工程学院,天津300072 [2]天津理工大学自动化学院,天津300384 [3]天津市复杂控制理论及应用重点实验室,天津300384

出　　处：《高电压技术》2018年第8期2754-2760,共7页High Voltage Engineering

基　　金：国家自然科学基金(50877053)~~

摘　　要：随着分布式发电技术的不断成熟和发展,微网与大电网之间的友好协作变得更加重要。因此在改进下垂控制基础上增加了相位的前馈补偿思想,提出了基于线性逐次逼近相位修正算法的相位调节方法,设计了一种可实现微网从孤岛向并网运行模式切换前的同步并网控制器。通过实验可以看出,在改进后的控制策略下,频率超调量较改进前减少了约38%,频率调节时间减少了30%,并网前的相位误差几乎为0,频率误差也能控制在0.01 Hz以内,从而保证了微网的平滑稳定运行。With the maturity and development of the distributed generation technology, it becomes more and more crucial that micro grid should smoothly cooperate with the power grid. Consequently, by adding phase feed forward compensation on the basis of the advanced droop control, we put forward a new phase regulation method by using the modified algorithm based on linear gradually approaching. A running controller is designed to realize the synchronization before the transferring from the island mode to the grid-connected mode. The results reveal that, under the advanced control strategy, the frequency overshoot is reduced by about 38%, the frequency modified time is reduced by 30%, the error of phases is about zero, and the frequency error can be controlled within 0.01 Hz, which ensure the smooth and stable operation of the microgrid.

关 键 词：微网 改进下垂控制 相位调节 前馈补偿 线性逐次逼近 

分 类 号：TM732[电气工程—电力系统及自动化]