Influence of Distributed Photovoltaic Generation on Voltage in Distribution Network and Solution of Voltage Beyond Limits

Abstract

From the viewpoint of voltage drop in power network,the voltage variation mechanism of distribution network before and after the connection of photovoltaic (PV) generation to distribution network is researched. The influences of connecting single PV generation and multi PV generation to distribution network on voltage of distribution network are analyzed respectively,and the obtained conclusions are as following:connecting PV generation to distribution network makes line voltage of distribution network arisen,and the voltage variation at a certain position directly relates to the sum of all loads subsequent to this position and the output of PV generation. The factor influencing voltage variation,such as output power of PV generation,the position where PV generation is connected with,parameters of distribution network,load power and so on. The correctness of above-mentioned analysis is verified by two calculation examples,meanwhile,the measures and schemes to cope with the voltage beyond limits due to connecting single or multi PV generation with distribution network,such as adopting compensation reactor,combining central control of transmission lines with reactor power control of inverters,installing energy storage devices and so on,are put forward.