Typical Design of Distributed PV Access Distribution System in Anhui

This document presents a typical design for distributed photovoltaic (PV) access distribution systems in Anhui Province, China. It addresses the rapid growth of distributed solar power, driven by national carbon peak and neutrality strategies, and the challenges of integrating rooftop PV into county-level distribution networks, such as power fluctuations, generation-use imbalances, and power quality issues. The design aims to standardize grid connection methods to ensure safety, coordination, advancement, and systematic integration. It covers principles like safety, coordination with grid capacity, adoption of latest technologies, and systematic adaptability for various scenarios. The work, led by State Grid Anhui Electric Power Co., Ltd., involved multiple power supply companies and experts. It proposes eight typical AC grid connection schemes (220/380V, 10kV) and two DC schemes (375V, ±), focusing on grid-connected engineering, primary and secondary systems, communications, and metering. The goal is to enhance distribution network capacity for distributed generation, support new power system construction, and promote low-carbon energy transition.