Research on Voltage Exceeding Limits of Active Distribution Network Caused by Distributed Photovoltaic

Abstract

At present, distributed power sources represented by photovoltaics are being widely connected to the distribution network gradually with their clean and flexible power generation methods. The output of the distributed photovoltaic is easily affected by environmental factors, and this uncertainty will have a huge impact on the economics and reliability of the distribution network. Aiming at the problem of voltage exceeding limits caused by distributed photovoltaic access to active distribution network, this paper introduces the influence on the reliability of distribution network when distributed photovoltaic grid-connected, details the change of distribution network voltage after distributed photovoltaic grid-connected, and analyzes the control strategy of photovoltaic inverter. Also, the simulation model of photovoltaic power supply into distribution network system is established, explores the voltage variation of different line length, voltage load and conductor cross-sectional area after distributed photovoltaic access. The simulation results show that the problem of the voltage exceeding limits of the active distribution network caused by photovoltaic grid connection can be solved by photovoltaic inverter control effectively.