Abstract
There has been a considerable importance for the islanding detection due to the growing integration of distributed generations (DGs) in the modern power grids. This paper proposes a novel active islanding detection scheme for synchronous DGs, considering two additional compensators and a positive feedback for each of active and reactive power control loops. The added blocks are designed using the small gain theorem and stability margins definition considering characteristics of open loop transfer functions of synchronous DG control loops. Islanding can be detected using the proposed method even where there is an exact match between generation and local load without sacrificing power quality. In addition, the performance of the proposed method can be retained even with high penetration of motor loads. The proposed scheme improves the stability and power quality of the grid, when the synchronous DG is subjected to the grid-connected disturbances. Furthermore, this method augments the stability margins of the system in the grid-connected conditions to enhance the disturbances ride-through capability of the system and reduce the negative impact of the active methods on the power quality. Simultaneous advantages of the proposed scheme are demonstrated by modeling a test system in MATLAB software and time-domain simulation achieved by PSCAD.
Highlights
Integration of distributed generation (DG) into the power grids have an essential role to reduce transmission and distribution network capacity, improve the security of system, and reduce overall costs [1,2,3]
In reference [24], an active anti-islanding scheme based on a strong theory presented for synchronous DG which insert positive feedback for active and reactive power control loops to ensure that the system is intentionally unstable in the islanding situation
The proposed islanding detection scheme is evaluated using the time-domain simulation of the test system depicted in Figure 4 which is modeled in PSCAD software
Summary
Integration of distributed generation (DG) into the power grids have an essential role to reduce transmission and distribution network capacity, improve the security of system, and reduce overall costs [1,2,3]. These modifications are designed to cause the instability of the system in the islanding situation without any adverse impact on the system operation when the DG is connected to the main grid. In reference [24], an active anti-islanding scheme based on a strong theory presented for synchronous DG which insert positive feedback for active and reactive power control loops to ensure that the system is intentionally unstable in the islanding situation. Other interesting approach is modifying and inserting specific controllers into active and reactive power control loops [25] by adding the integral controller to the synchronous DG conventional control loop scheme
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
