Voltage Coordination Control Strategy of Distributed Generation Based on Distribution Network Operation State

Distributed generators are usually connected to medium and low voltage distribution networks. The structure of distribution networks has changed from a single radial network to a two-terminal and multi-terminal network with multiple power sources. The characteristics of power flow and voltage distribution in power networks have become more complex. Aiming at the problem of voltage control of distributed generation in distribution network, this paper firstly theoretically analyses the coupling relationship between voltage and active/reactive power in distribution network, and then compares the reactive and active power control methods under different R/X conditions. Then, by dividing the operation of distribution network into three states: normal, early warning and emergency, coordination control strategy of multi-distributed photovoltaic power under different conditions are proposed, which is validated by the IEEE standard example. The coordinated control strategy proposed in this paper has important application value for ensuring reliable and stable operation of distribution network and distributed power supply.