Abstract: As traditional condenser is replaced by static var generator（SVG），the dynamic reactive power

compensation can be provided by SVG. However，compared with traditional condenser，SVG lacks rotational inertia.Traditional research of SVG mainly focused on reactive power compensation and fault ride-through，and there is no research on improving the inertia of SVG. In response to this problem，a power electronic virtual condenser with dynamic reactive power compensation and dynamic inertia response capabilities was proposed. Firstly，the topological structure under different voltage levels was designed specifically. Secondly，starting from energy storage，super capacitors were selected as components of the energy storage，and the configuration of the energy storage and the parameters of the energy storage components were designed at the same time. Then，the control strategy was designed in two aspects from the inertia response and reactive power compensation. After that，compared with the traditional condenser，the corresponding relationship between energy utilization and inertia response was derived.Finally，the correctness of the theoretical analysis was verified by PSCAD/EMTDC simulations.

      Key words: static var generator （SVG）；inertia；condenser；frequency-voltage