The stator grounding fault protection with 20Hz voltage injection can provide 100% winding s protection and monitor the drop of stator s insulation.

This paper studies the factors including injection pattern, injection procedure and slug size which influence the displacement efficiency of loam flooding.

First, we had done the research on the injection pattern and measurement of viscoelasticity of the ternary compound systems with each kind of polymer, respectively, from which concluded that resistance factor and residual resistance factor increased as the increasing of the concentration of polymer, and so the viscoelasticity did.

Through numerical simulation and physical simulation,the influences of injection manner,different contact relations and different injection velocity ration on the development effect of the contact zones of polymer flooding and wat.

Study on stability of injection type hybrid active power filter;

The mathematical model of injection type hybrid active power filter is built and the recursive PI(Proportional Integral) control algorithm is proposed for its current tracking,to which the fuzzy adaptive mechanism is introduced to enhance its static and dynamic performances.

Taking a new injection type hybrid active power filter as an example, this paper proposes a new technology for eliminating switching ripples with adopting the synthesis control algorithm for current tracking, attaching the SVPWM based on random PWM and installing the output filter desig.