Regular Article

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

¹ State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, PR China
² Key Laboratory of Distributed Energy Storage and Micro-grid of Hebei Province, North China Electric Power University, Baoding 071003, PR China

^* Corresponding author: 13315282094@163.com

Received: 3 December 2024
Accepted: 7 March 2025

Abstract

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.