Local Voltage Control of Distribution Network Based on PV Inverter Reactive Capacity

Abstract:
Aiming at the problem of increased network loss and over-limit voltage caused by a large number of distributed photovoltaic generations connected to the distribution network, a local voltage control method based on the PV inverter reactive capacity was proposed. In order to minimize the system network loss and photovoltaic light discarding, a reactive power optimization model of distribution network was established considering the voltage constraints and the capacity constraints of inverter, and solved by particle swarm optimization algorithm. In this strategy, the active and reactive power output of the inverter is adjusted, and the traditional voltage regulation methods such as OLTC and capacitor banks are used to ensure that the node voltage of the system is within the specified range. The local voltage control of the distribution network under the distributed photovoltaic access is realized. Finally, the correctness and feasibility of the proposed method are verified by an example of improved IEEE33 node distribution system.