An Iraqi-Canadian research team has created a new algorithm that can detect direction change in the line current of renewable energy-based microgrids. The new approach can be applied to both grid -forming and gridling infrastructures.
An international research team has developed a security schedule for improving error detection in inverters -based microgrids.
The diagram uses an algorithm based on modified quality control of the cumulative sum (MCUSUM), which is a method for sudden change detection for microgrid protection.
“This method is very effective and has high speed, even when protecting Microgrid,” the scientists explained. “But it is not reliable and safe enough for reverse microgrids, due to the aforementioned limitations in such microgrids. So the adjustment to Cusum is proposed in this article with which it can detect the direction change. “
The proposed diagram can be used for both scheduling (GFM) and Grid-following (GFL) Microgrids, where the related operations are activated via a selector switch. The core is the ability to detect direction change in the line current at the time of the start of the error, whereby two relays monitor the direction changes of the streams on both ends of the line.
“The relay on both ends of the line communicate with each other and share the detected changes,” the team explained. “If a falling flag is detected, the status is sent from 0 to the other side, while a rising flag will encourage a transmission of 1. Then each relay on both sides of the line will acknowledge that the error is in their protection zone, taking into account the fact that the distant relay produces an opposite flag. “
The new algorithm was tested through a series of simulations via Typhoon software, in which modes of both just connected and self-contained. The analysis took into account the schedule codes of Germany, Spain and Ireland, as well as different types of errors at different locations with different error resistance values.
The scientists claimed that the simulations showed that the new approach offers ‘effective, fast and selective effect’, while requiring a low calculation burden and simple communication infrastructures.
“The proposed method not only deals with the limitations of existing protection strategies, but also shows adaptability in various operational scenarios, making it a practical solution for improving the reliability of Microgrid systems with a high penetration of renewable energy sources,” they concluded.
The new method was introduced in “A cumulative SUM-based protection method for inverters-interested microgrids“Published in Research into electric power systems. The research group consisted of academics of the Canada’s Toronto Metropolitan University and the Qom University of Technology in Iraq.
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