文章摘要
房志学,苏建徽,王华锋,等.微网逆变器低电压穿越控制策略[J].电力系统自动化. DOI: 10.7500/AEPS20180408004.
FANG Zhixue,SU Jianhui,WANG Huafeng, et al.Low Voltage Ride Through Control Strategy of Microgrid Inverter[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180408004.
微网逆变器低电压穿越控制策略
Low Voltage Ride Through Control Strategy of Microgrid Inverter
DOI:10.7500/AEPS20180408004
关键词: 下垂控制  低电压穿越  不平衡故障  快速恢复
KeyWords: Droop control  Low voltage ride through  Unbalanced fault  Fast recovery
上网日期:2018-09-30
基金项目:国家重点研发计划资助(2017YFB0903503)
作者单位E-mail
房志学 合肥工业大学电气与自动化工程学院 wd_hfut@126.com 
苏建徽 合肥工业大学电气与自动化工程学院 su_chen@126.com 
王华锋 全球能源互联网研究院有限公司 whfchxl@163.com 
施 永 合肥工业大学电气与自动化工程学院 fang_zhixue@126.com 
徐华电 合肥工业大学电气与自动化工程学院 xuhuadian@126.com 
摘要:
      微网逆变器一般采用下垂控制或虚拟同步机控制,其低电压穿越方式及特性与基于PQ控制的逆变器不同。下垂控制或虚拟同步机控制的逆变器低电压穿越的主要问题是在故障期间逆变器电压与电网电压之间产生了相位的偏移,该相位偏移会严重影响并网电流恢复的速度。针对上述问题,提出一种在故障期间对功角等变量进行记忆保持的策略,使变量在故障前后基本保持一致,以实现故障后系统的快速恢复。针对故障期间产生的负序分量,采用在双同步旋转坐标系下对正、负序电流进行独立控制并引入电网电压前馈的方法。仿真和实验均验证了控制策略的正确性和有效性。
Abstract:
      The microgrid inverter generally controlled by droop or virtual synchronous generator, and their methods and charac-teristics during low voltage ride through are different from those of inverters controlled by PQ. The main problem of droop control or virtual synchronous generator control is the phase shift between the inverter voltage and the grid volt-age during the fault, which will greatly affect the recovery speed of the grid-connected current. Aiming at the above problems, this paper proposes a strategy for memory retention of variables such as power angle during faults, so that the variables are basically consistent before and after the fault, so as to achieve rapid recovery of the system after the fault. Independently control the positive and negative sequence electric currents in the double synchronous rotating coordinate system and introducing the grid voltage feed forward to eliminate the negative sequence component during faults. Both simulation and experiment verify the correctness and effectiveness of the control strategy.
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