利用串联制动电阻提高光伏并网系统故障穿越能力的研究  

STUDY OF IMPROVING FAULT RIDE-THROUGH ABILITY OF GRID-CONNECTED PV GENERATION SYSTEM USING SERIES BRAKING RESISTOR

作　　者：党克[1] 郑玉浩 杨富磊 戚坤基 颜冬[1] 严干贵[1] 

机构地区：[1]东北电力大学电气工程学院,吉林132012

出　　处：《太阳能学报》2017年第2期302-308,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51277024)

摘　　要：为了优化光伏并网系统的故障穿越能力,提出一种结构简单、设备经济的灵活串联制动电阻(flexibleseries braking resistors,FSBR)方法。在短路等引起的低电压故障中,FSBR能够以热能方式耗散掉短路冲击电流并且自身产生可观的压降,从而支撑并网公共点电压;在突然卸荷等引起的高电压故障中,FSBR能够以串联分压方式减轻过电压的冲击,从而保护直流母线侧电压恒定;在电压故障引起的频率跳变故障中,FSBR通过平衡光伏系统与电网两侧的功率供需间接提高频率跟踪性能。通过建立光伏并网模型,探讨FSBR制动电阻大小与运行时间、投切控制策略对故障穿越的影响。仿真结果表明所提FSBR方法在优化光伏并网系统故障穿越能力上具有可行性与优越性。In order to optimize fault ride-through ability of grid-connected PV power system, a flexible series braking resistors （FSBR） technique with characteristic of simple structure and economical equipment is introduced. When low voltage fault caused by grid short circuit and so on occurs, the FSBR can sustain the voltage amplitude of grid-connected common point by consuming the heat energy of short circuit lash current and getting certain voltage amplitude. When high voltage fault caused by sudden load shedding and so on happens, the FSBR can reduce the impact of overvohage with series partial voltage to protect constant voltage on DC bus side. For frequency jumping fault caused by grid voltage fault, FSBR can indirectly improve frequency tracking capability by balancing the power supply and demand between PV generation system and grid. The effect of the size and operation time of FSBR braking resistor, switching control strategy on fault ride-through is discussed by constructing the model of grid-connected PV generation system. The simulation results show that the FSBR technique is feasible and superior in optimizing fault ride through ability in grid-connected PV generation system.

关 键 词：光伏并网系统 故障穿越 灵活串联制动电阻 投切控制 

分 类 号：TM615[电气工程—电力系统及自动化]