Study Of The Digital Realization Of IEC's Flickermeter

With the development of our country's economy, the sudden increase of load, especially the incessant increase of impulsive and nonlinear loads,power quality problems often occur,such as voltage fluctuation and flicker.So it becomes more and more important to study the voltage fluctuation and flicker.According to IEC's standards involved, voltage fluctuation and flicker become a index of power quality.But the research in those aspects such as harmonic frequency excursion and ect. of power quality is more then in voltage fluctuation and flicker.Because flicker relates to light people's eyes and brain,its conception is more complicated,and the country's old standard about it wasn't emended until in 2000,the research about it started so late and still has many problems.This paper mostly studies the digital realization of IEC's flickermeter. The measurement of flicker is intruduced and the importance of flickermeter in the flicker measurement is pointed out.Then the principle of DEC flickermeter and both the analogue and digital realization methods are expounded.At the same time, all parts of flickermeter are designed.This paper simulates the effect of voltage fluctuation inspection through the tool of Matlab. And proves the filters's stability.In the part of self-checkout, PI(Proportional Integral) control arithmetic is put forward to check the gain K and the calculated results show the method's effectiveness.Then many comparements toward Pst are done indifferent realization methods such as different interpolation points classification number and sample frequency. Though simulation and calculation we can see the designed flicermeter can meet our country's standands.At last, the arithmetic is applied in a wind power system, and the index of Pst is calculated.From the country's standard of it we can see its flicker is in the limit.