Island detection method based on electric power wireless private network

Abstract

The invention discloses an island detection method based on an electric power wireless private network, which comprises the steps of building an electric power wireless private network in a power distribution network area to which a distributed photovoltaic power station belongs; configuring a wireless communication data collector for each switching node in a power distribution network line, and performing network node configuration; performing topology structure initialization in the power distribution network area where the distribution photovoltaic power station is located, and generating a topology model; subscribing switching state information towards related communication nodes in an associated line by the distribution photovoltaic power station (DG) according to the topology model; and judging whether an island occurs or not according to an acquired communication node switching state. According to the invention, the state of switching nodes in a line is acquired based on a mode of remote communication, whether an island exists or not is judged according to the acquired state, and an alarm is given timely if an island occurs, so that no influences is imposed on the power quality, the accuracy is high, and the practicability is strong.

Description

technical field [0001] The invention relates to an islanding detection method based on a wireless private electric power network, and belongs to the field of anti-islanding protection of distributed new energy generation and grid connection. Background technique [0002] In response to the dual pressure of the global environment and energy, countries around the world are actively adjusting their energy structures. As a form of renewable and clean energy generation, distributed photovoltaic power plants have developed rapidly in recent years. [0003] The island problem has always been the focus of research in the grid-connected operation of distributed power generation. Island operation can be divided into planned island and unplanned island. The operating state of unplanned island is accidental and the scope is uncertain. System, distributed power supply and its power equipment cause damage. When the DG is in the island operation state, the inverter terminal voltage, frequ...

AI Technical Summary

Problems solved by technology

The principle of passive detection method is relatively simple, no need to add additional equipment, and has no impact on power quality and grid stability, but there are large detection blind spots, and the detection time is too long

The active detection method is to detect islands by injecting disturbance signals into the system, which often has an impact on power quality, or multiple disturbance signal sources interfere with each other to cause misjudgment or fail to detect the island state

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