This article,based on the research results before and using Matlab magazine,has established an emulation model of the parallel APF based on load current detection and did some emulation researches,which is proved feasible.

This paper aims at the above-mentioned problem and extends the original DPM architecture by adding two modules,namely,the system workload detecting and policy optimizing modules.

Two important features(standy operation mode and the negative sensing technique) are introduced.

Single-phase parallel hybrid active power filter adopting novel control approach of load current detection;

The principium of hot rolling bar shear controlled by T400,and the effect of speed set-point characteristic to load current are analyzed.

The analysis and Matlab simulation results show that the proposed controller greatly improves the dy- namic behavior of buck converter caused by fast variation of input voltage and/or load current,features clear physical meaning and easy design.

Based on the theoretical analysis of each factor inducing vibration of core and winding, the experiments validated that the fundamental frequency magnitudes of core and winding vibrations are linear to square of no-load voltage and loading current respectively.