摘要
当前风电场规模日益扩大,连锁故障频发。一般风电场配置完善的保护装置,其中自动重合闸系统在永久性故障时使系统电压两次跌落,从而引发相邻风电场连锁脱网,对风电场的安全稳定运行造成巨大威胁。基于这一现象,以双馈风机为例,研究110 k V的风电场联络线发生故障时,两次故障跌落时刻其相邻风电场定子磁链初值大小不同,分析了自动重合闸重合永久性故障时系统电压两次跌落造成风电场连锁脱网的机理。在此基础上,提出了使用改变重合闸功能配置以及延长重合时间等方法解决这一问题,并仿真验证了两种方法的有效性。
With the increasing size of wind farm, cascading fault often occurs. Automatic reclosing will make the voltage drops twice when permanent faults occur in the power system, causing a chain of adjacent wind farm off the grid, which poses a great threat on the safety and stability of the wind farm. This paper analyzes the mechanism of the chains of the wind farms off-grids caused by twice voltage drops from the aspect that the initial stator flux of DFIG differs between the twice moment when the voltage drop when the short-circuit fault occurs on the 110 kV wind farm connection line. On this basis, this paper proposes two methods, namely changing the functional configuration of reclosing and extending the time of reclosing, to solve this problem. And the simulations verify the effectiveness of the two methods.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2015年第5期51-56,共6页
Power System Protection and Control
基金
国家高技术研究发展计划(863计划)资助项目(2012AA050208)~~
关键词
连锁脱网
电压跌落
重合闸
磁链
功能配置
重合时间
cascade failure
voltage drop
reclosing
flux
functional configuration
reclosing time
