Power distribution network fault reconfiguration and voltage control method based on distributed energy storage and power distribution network fault reconfiguration and voltage control system thereof

Abstract

The invention relates to the field of power distribution network post-fault power supply recovery and voltage control, and particularly discloses a power distribution network fault reconfiguration and voltage control method based on distributed energy storage and a power distribution network fault reconfiguration and voltage control system thereof. According to the method, quick recovery of active power distribution network post-fault power supply is realized by using an active power distribution network dynamic network reconfiguration method with the least active power distribution network fault recovery cost acting as the objective for aiming at the disconnection fault in the active power distribution network based on the electric energy support of the energy storage device and the voltage regulation effect of the voltage regulation device in the active power distribution network according to the principle of no overload line or over-limit voltage, and the power supply scheme of the power distribution network non-fault area load is updated in real time for aiming at the energy storage and DC state change in the fault period. According to the method, the energy storage and charge and discharge strategy is formulated fully on the basis of the state-of-charge, the DG consumption state and the possible outage time of the energy storage device in the fault period, and the voltage regulation device is coordinated to perform regulation and active power distribution network dynamic network reconfiguration according to the strategy so as to recover load power supply in the active power distribution network as much as possible.

Description

technical field [0001] The invention relates to the field of power supply recovery and voltage control after active distribution network failure, and in particular to a distribution network fault reconstruction and voltage control method and system based on distributed energy storage. Background technique [0002] At present, active distribution network fault recovery requires short recovery time, less load shedding, and topological structure to meet safe operation requirements; at the same time, with the grid connection of clean energy, DG fault operation requirements increase the complexity of distribution network fault recovery , most of the existing fault recovery technologies are based on the impact of DG on fault recovery, starting from load shedding, network loss after fault recovery, and fault recovery costs, etc., adopting a multi-objective and multi-constraint method to carry out post-fault recovery strategies for active distribution networks There are a lot of fav...

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Problems solved by technology

[0002] At present, active distribution network fault recovery requires short recovery time, less load shedding, and topological structure to meet safe operation requirements; at the same time, with the grid connection of clean energy, DG fault operation requirements increase the complexity of distribution network fault recovery , most of the existing fault recovery technologies are based on the impact of DG on fault recovery, starting from load shedding, network loss after fault recovery, and fault recovery costs, etc., adopting a multi-objective and multi-constraint method to carry out post-fault recovery strategies for active distribution networks There are a lot of favorable discussions; however, with the active distribution network structure and the increasingly abundant participating components, the following problems still exist in the recovery of the active distribution network after a fault. First, the variability of the "source load" of the energy storage device has The threat of active distribution network failure recovery; second, the active distribution network has abundant voltage regulation resources, but it has not fully considered its regulation ability during fault recovery; third, the active distribution network fault has a certain duration, and the current Fault recovery is only aimed at the fault recovery problem of the distribution network at the time of the fault, and does not fully consider the security threat of the DG and load sequence fluctuations to the fault operation state during the fault period.

[0003] Therefore, some scholars have proposed a fault recovery model based on the coordination of interruptible loads and DGs, but they have not further optimized the load and DG output fluctuations in the distribution network during the fault period; some methods use multi-stage fault recovery to improve The fault recovery efficiency is improved, but it is not based on the complexity of the active distribution network; for the active distribution network with distributed energy storage, a single network reconfiguration method or a single-time fault recovery strategy cannot fully guarantee the active distribution network during the entire fault period. Safe power supply in non-faulty areas of the power grid

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