**The Improvement of an Islanding Detection Method Based on the Perturbation Signal in Case of a Multi-Photovoltaic Operation**

**Thanh Son Tran 1,2,\* , Duc Tuyen Nguyen <sup>2</sup> and Goro FUJITA <sup>3</sup>**


Received: 22 August 2019; Accepted: 24 September 2019; Published: 27 September 2019

**Abstract:** Islanding phenomenon is one of the consequences of the emergence and development of microgrids in the power system. Injected signal cancellation is a common problem in a multidistributed generation that has a significant influence on active islanding detection methods. In this study, this issue was analyzed by injecting a perturbation signal in the multi-photovoltaic system. Furthermore, the promising solution to eliminate injected signal cancellation was proposed in this paper. The solution was validated through mathematical explanations and simulation results.

**Keywords:** islanding detection; DC grid; active islanding detection method; injected signal cancellation; multi-distributed generations; perturbation signal; photovoltaic system
