A two-stage voltage regulation method based on Raft algorithm for photo-storage combination

Distributed photovoltaic large-scale access to the grid has become a future trend, making the distribution network transformed from a single radial to a multi-source weak-ring mesh structure, which is prone to cause problems such as backward tidal flow and voltage overruns. This paper proposes a two-stage voltage regulation method based on the Raft algorithm for combined light - storage, selecting the active output ratio of $P V$ inverter and the amount of storage charge state change as state variables, and using the Raft algorithm consistency coordination. Realise the burden of voltage regulation is borne by each node of the grid on average to complete the voltage regulation, and simulation verification is carried out through 8-node 220v low-voltage distribution network. The results show that the two-stage voltage regulation effectively suppresses the voltage overrun problem.