Abstract: More than 10kV high voltage power systems dynamic var continuous flexible fast parallel compensation technology research and application, has been the focus of the electric researchers in the domestic and foreign and need to focus on solving the key technology research. Because of it plays a vital role in the rapid adjustment of high voltage power system dynamic var and control of power system dynamic voltage stability. It will play an important role on the new energy power grid in the low voltage penetration and voltage stability. And key technology research of no harmonic dynamic var continuous flexible fast parallel compensation is one of its development trends. For the technology problems of high voltage power systems dynamic var continuous flexible parallel compensation, put forward a kind of new technology research topics of the key module structure in the high voltage power system dynamic var continuous flexible no-harmonic var fast parallel compensation and different from STATCOM(SVG) and SVC technology. Put forward the key technology module structure of the controlled no-harmonic var compensator and the high-capacity dynamic var and no-harmonic and step-less flexible and fast parallel compensation（DVNH-SFPC）of which adapt to the new energy power grid in the low voltage penetration and voltage stability in the high-voltage power systems.