An svg-based over/under frequency anti-islanding device for distributed photovoltaic power generation systems

Abstract

The invention provides an SVG (Scalable Vector Graphics) based over-frequency / under-frequency anti-islanding device of a distributive photovoltaic generating system. The device comprises a cabinet body, a scram button, a voltmeter, an operating switch and a static var generator; the scram button is mounted on the surface of the cabinet body; the voltmeter, the operating switch and the static var generator are mounted in the cabinet body; the operating switch is chained with the static var generator through a cable; the voltmeter is connected to a cable between the operating switch and the static var generator through a conductor. According to the device, the static var generator can be adaptively added to a distribution and transformation medium- and low-voltage bus by a distributive photovoltaic way, and a 380V distribution branch box, a 220V / 380V consumer distribution box and other typical forms can be introduced; the introduced static var generator does not damage a distributive photovoltaic generating system device, electrical load, low-voltage fuse and the like; the input capacity of the static var generator is connected with the capacity for forming an island system.

Description

technical field [0001] The invention relates to an anti-islanding device, in particular to an over / under-frequency anti-islanding device for a distributed photovoltaic power generation system based on SVG. Background technique [0002] The combination of distributed photovoltaic power generation and the existing power system forms an efficient and flexible power system, which can improve the energy utilization efficiency of the whole society and improve the stability and reliability of power supply. But at the same time, distributed power generation also brings many new problems to the power system, and the island effect is one of them. The island effect means that when the power grid is interrupted due to electrical failure, misoperation or natural factors, the distributed power generation system fails to detect the power outage and breaks away from the power grid, and still supplies power to the surrounding loads, thus forming a grid that is not controlled by the grid. Se...

AI Technical Summary

Problems solved by technology

[0019] According to the above analysis, when the island effect occurs in the distributed photovoltaic grid-connected system, although a set of schemes can detect the island to a large extent, it cannot fully detect all the hidden dangers of the island.

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