State estimation method of distribution network based on load current takes load current as state variable, the branch measurement function is represented with load current, and the state estimation value of branch current can be obtained, which reduces the solution space of state estimation problem and raises the convergence of algorithm and calculation speed.

The reliability and sensitivity of the present adaptive current protection is dropped under phase-to-phase fault due to the existence of load current in non-valid grounded power systems.

Here introducing the way that when the bus energral to use the load current to simulate the busbar fault so as to check the problem of circuit and to correct and solve it.

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.