Distributed PV auxiliary voltage control strategy in low voltage distribution network based on small AC signals

In order to solve the problem of power flow to the distribution network and voltage overstep caused by the high proportion of distributed PV access, this paper proposes a coordinated voltage regulation strategy leveraging the reactive-active power control capabilities of PV systems. First, a systematic analysis of voltage deviation mechanisms induced by high-density PV integration is conducted. Second, a hybrid control framework is developed that synergistically coordinates reactive power compensation and active power curtailment, enabling adaptive voltage regulation across the distribution network. Third, a small-signal injection-based communication protocol is implemented to achieve decentralized coordination among multiple PV units. The simulation results demonstrate the effectiveness of the proposed strategy.