Abstract:

In view of the unbalance of load in power network and the distortion of system voltage,the traditional detection algorithm is easy to produce delay and other problems.The topology of hybrid active power filter(HAPF) is introduced,the principle of instantaneous reactive power theory i_p-i_q harmonic detection algorithm is expounded.On this basis,a new HAPF harmonic detection algorithm is proposed.The main purpose of this algorithm is to reduce the delay of digital-to-analog conversion and control signal by setting the compensation angle on the basis of the detection algorithm.The load usually consists of 5,7,9 and 11 equal currents.In this paper,the detection principle of harmonic current of 7 loads is analyzed.The new algorithm is simulated by MATLAB simulation software.The simulation results show that the new algorithm has the characteristics of fast speed and small delay,can meet the needs of HAPF harmonic detection,and has a certain industrial practical value.

Key words: active power filter, topology, detection algorithm, compensation angle