摘要
IEC闪变测试模拟系统在低频段存在误差,将模拟系统转换成数字系统后误差依然存在,而风力发电引起的闪变频率约为1～3 Hz,正好位于闪变测试系统的低频段。在Matlab/Simulink仿真平台上用双线性变换法将模拟系统变换成数字系统,建立了IEC闪变仪的数字化模型,对闪变仪在低频段产生误差的原因进行了分析,然后通过修正加权滤波器的参数,使瞬时闪变视感度S(t)的误差在允许的±5%的范围内,提高了闪变仪在低频段的精度,同时又不影响高频段的精度,从而满足了风力发电引起的闪变测试要求。所提出的方法可用于测试风电引起闪变的闪变仪设计中。
There is error in low frequency bands of both IEC analog flicker meter and digital flicker meter, which is converted from the former. The frequency range of the flickers caused by wind power generation is about 1-3 Hz,which is just in the low frequency band of flicker meter. Converting analog flicker meter to the digital one by using bilinear transformation method,the digital model is established on Matlab/Simulink platform and the causes of the low frequency error are analyzed. To meet the requirement of wind power generation for flicker monitoring, the precision of flicker meter in low frequency band has greatly improved by modifying the parameter of its weighted filter,in which the error of instantaneous perceptibility S （t） is remained in the allowable range of ±5 % ,while the precision in high frequency band has kept. The proposed method can be applied to the design of flicker meter for wind power generation.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第1期69-72,共4页
Electric Power Automation Equipment
关键词
风力发电
电能质量
闪变
wind power generation
power quality
flicker
