Abstract: Aiming at the problems of small regulation range and slow speed of traditional voltage regulators such as compensation capacitors in distribution network line voltage compensation，a voltage compensation scheme of distribution network in sparse area was proposed，the voltage hierarchical coordinated control strategy was designed based on power electronic voltage regulator. Firstly，the power electronic voltage regulator was quivalent to the node power injection model. And the active and reactive power regulation quantities of equivalent node was calculated by particle swarm optimization algorithm，that is the additional power was injected into the node.Then，the power flow was calculated by the additional power to decide the compensation voltage and phase angle of the power electronic voltage regulator，the decoupling of power compensation optimization calculation and power flow calculation were realized. In the improved IEEE33 node equivalent model system，an example was given. The results show that the proposed strategy can effectively reduce the line voltage drop，moreover，the decoupling of power optimization and power flow calculation can reduce the calculation complexity and improve the calculation accuracy.

      Key words: power electronic voltage regulator；line voltage drop; node power injection model; voltage compensation; double-layer optimal control of PSO