Multiprocess island effect detection device and method

Abstract

The invention relates to a multiprocess island effect detection device and method and belongs to the field of fault detection of distributed power generation systems. Compared with the traditional island detection device, the multiprocess island effect detection device provided by the invention has the characteristics of small non-detection zone, high detection accuracy, strong applicability and the like; and island detection is carried out on a system by adopting a passive detection mode in which detection variables are mutually independent, and the island detection can be carried out on the system more comprehensively. Compared with the traditional island detection device which adopts single passive detection and active detection, the detection device provided by the invention has the characteristics that the advantages of less pollution to harmonic wave of a power grid and rapidity of passive detection are fully played, rapid judgement on the system is firstly realized, if the distributed power generation system is in an island state, the system is rapidly removed from the power grid. Besides, active detection is called to recheck the result of the passive detection, the advantage of high detection accuracy of the passive detection is fully played, and the defects that the detection time is long and the pollution level to the harmonic wave of the power grid is high can be overcome.

Description

technical field [0001] The invention belongs to the field of fault detection of distributed power generation systems, and in particular relates to a multi-process islanding effect detection device and method. Background technique [0002] Since the 20th century, with the rapid development of economy and society, energy consumption has been increasing day by day, and the rapid growth of power demand has made people pay more and more attention to the development of renewable energy. more attention. As the number of distributed power generation systems connected to the grid increases year by year, the island effect has become the main factor restricting distributed power generation technology. Due to the characteristics of small power generation capacity and scattered layout, the traditional dispatching method cannot be effectively controlled. In this way, when the power grid fails, the grid-connected distributed power generation system will fall into an island state. In orde...

AI Technical Summary

Problems solved by technology

There are many types of island detection technologies that combine active detection and passive detection, such as the combination of over-undervoltage / over-underfrequency detection method and frequency offset detection method, the combination of voltage harmonic detection method and sliding mode frequency drift detection method... .. But these methods all have technical defects, such as high technical difficulty in implementation, large detection blind spots, complex control devices, long detection time, etc.

Images