Running maintenance method for power distribution network comprising plurality of photovoltaic microgrids

Abstract

The invention provides a running maintenance method for a power distribution network comprising a plurality of photovoltaic microgrids, and belongs to the field of running maintenance of the power distribution network. By the running maintenance method, the problem that security threat can be brought to the power distribution network and a worker by an existing method is solved. The running maintenance method comprises the steps of building a power distribution network model comprising the plurality of photovoltaic microgrids, wherein the power distribution network model comprises a distribution network main trunk, a distribution network branch and a photovoltaic microgrid branch, and the distribution network main trunk, the distribution network branch and the photovoltaic microgrid branchrespectively comprises a plurality of nodes; setting a short-circuit fault at each node of the distribution network main trunk and the distribution network branch of the power distribution network model, recording a voltage effective value of each node at the fault, and judging whether running of the power distribution network model is reliable or not; determining the running maintenance method when the short-circuit fault occurs in the nodes of the distribution network main trunk and the distribution network branch of the power distribution network model if the power distribution network model is not reliable to run; and determining the running maintenance method when the short-circuit fault occurs in the nodes in the distribution network main trunk and the distribution network branch ofa power distribution network side corresponding to the power distribution network model.

Description

technical field [0001] The invention relates to the technical field of distribution network operation and maintenance, in particular to an operation and maintenance method for a distribution network containing multiple photovoltaic micro-grids. Background technique [0002] As the proportion of distributed energy such as photovoltaic power generation and wind power generation will gradually increase, more and more micro-grids will be connected to the distribution network, and the operation and maintenance methods of the traditional distribution network are far from meeting the requirements. The microgrid has different power generation characteristics and power consumption characteristics in different periods, which will affect the stability of the original distribution network when it is connected to the distribution network. For the distribution network, when the microgrid is connected to the grid, the power flow can flow from the distribution network to the microgrid, or f...

AI Technical Summary

Problems solved by technology

In the photovoltaic grid-connected system, when there is a power outage in the distribution network, if the power generated by the photovoltaic micro-grid grid-connected inverter and the local load on the low-voltage side of the distribution network just match, it is easy to maintain a self-sufficient power generation state. thereby endangering the safety of maintenance personnel

Similarly, when there is a fault on the photovoltaic microgrid side and personnel are required to repair it, but there is still power on the distribution network side, the distribution network side may reverse power transmission to the station, which will also give the photovoltaic microgrid side Maintenance personnel bring hidden dangers to life safety

Images