The Impact of Distributed Photovoltaic Integration on Voltage in Rural Distribution Networks and Solutions for Voltage Limit Violations

When a large-scale distributed photovoltaic power supply is connected to a distribution network, it may cause line overload, harmonic pollution, and voltage over-limitation. This paper mainly studies the influence of different penetration rate of distributed photovoltaic power supply on the voltage of typical rural distribution network, builds a rural distribution network model with distributed photovoltaic power supply by ETAP simulation software, simulates the power flow of the distribution network with photovoltaic power supply at different times in sunny days, and analyzes the influence of different photovoltaic power supply access on the voltage of rural distribution network at different times. In order to solve the problem of voltage beyond limits, this paper proposes a voltage regulation measure based on the central point, which is putting reactors in the central point of the distribution network, absorbing the excess reactive power of the grid by adjusting reactors when the bus voltage exceeds the limit, thus reducing the bus voltage. Finally, the effectiveness of this method is verified by a simulation example.